assembling the ssdl/scu pic17 protoboard

AG-5 Assembly Guide

750 Naples Street • San Francisco, CA 94112 • (415) 584-6360 • http://www.pumpkininc.com

created by Andrew E. Kalman on Oct 13, 2000 updated on Sep 30, 2001 All trademarks mentioned herein are properties of their respective companies.

Assembling the SSDL/SCU PIC17 Protoboard

Introduction Pumpkin's SSDL/SCU PIC17 Protoboard ("protoboard") is the second in a series of enhanced replacements for the existing PICmicro® prototyping PCB that Stanford University's Space Systems Development Laboratory (SSDL, http://ssdl.stanford.edu/) and Santa Clara University's Santa Clara Remote Extreme Environment Mechanism Laboratory (SCREEM, http://screem.engr.scu.edu/) have been building up by hand from the PICProto64 prototyping board from microEngineering Labs, Inc (http://www.microengineering-labs.com/). CAUTION Please review Special Instructions for REV A Protoboards below before assembling any protoboards. This will ensure their correct operation. Note The PIC17 Protoboard is derived from the SSL/SCU PICmicro Protoboard detailed in Pumpkin's Application Guide AG-1 "Assembling the SSDL/DCU PICmicro Protoboard." Both protoboards share many similar features. The protoboard is a two-sided printed circuit board (PCB), measuring 4.00" x 8.00" x 0.062". It has the following enhancements over the PICProto64:

additional benchtop power connectors via banana jacks

dedicated 9V battery clip (vertical-mount) three different power sources (bench, battery and

system), switch-selectable improved microcontroller reset circuitry built-in two RS-232 channels built-in, with MAX233 driver two serial SPI EEPROMs built-in I2C pull-ups built-in

http://ssdl.stanford.edu/

http://screem.engr.scu.edu/

http://www.microengineeringlabs.com/

Assembly Guide

2 AG-5 Assembling the SSDL/SCU PIC17 Protoboard

DB-9 connectors used throughout for system power, system data, hardware USART (RS-232) and software USART (RS-232)

improved power supply decoupling and distribution improved grounding and noise immunity distributed test points for critical voltages a 12 x 15 hole breadboard area on 0.100" centers with

GND and +5V rails

Additionally, this protoboard is designed around the Microchip® PIC17C756A1 single-chip microcontroller (instead of the PIC16F877 and similar/compatible PICmicros). External memory can be used with the 17C756A when operating in microprocessor or extended microcontroller modes. External memory can be accessed by the 17C756A via the table read and table write instructions. This protoboard supports both external program memory (Flash) and external RAM with configurable memory maps.

CAD Genesis The protoboard was designed in OrCAD SDT v4.1,2 and laid out in PADS-PCB and PADS-2000. The PCB has been assigned a Pumpkin part number of 705-00192, and a project number of 90003. It is currently at Revision A (REV A). The relevant files are:

90003A.sch: OrCAD schematic Pumpkin.lib: OrCAD library Pumpkin2.lib: OrCAD library 90003A.asc: PADS-2000 ASCII job file 90003A.job: PADS-2000 job file 90003A.net: Futurenet netlist 90003A.zip: all PCB CAD files, .zip'd 90003Apd.zip: schematic and PCB verify plots, in

Acrobat (.pdf) format, and Bill of Materials

90003Aps.zip: PCB verify plots, PostScript format

Circuit Description Please refer to Schematics below or 90003A-1.pdf and 90003A-2.pdf in 90003Apd.zip to view the protoboard's schematic. A general description, enhancements over and differences between

Assembly Guide

AG-5 Assembling the SSDL/SCU PIC17 Protoboard

3

the protoboard and the earlier PICProto64-based version are described below. The CPU U1 is specified as a Microchip® PIC17C756A. Other compatible 16-bit processors (e.g. PIC17C752, PIC17C756, etc.) in a 68-pin PLCC package may also be used. The Oscillator and the Serial (SPI) EEPROM are implemented in a conventional manner. The Reset Circuitry uses a MC33164P-5 micropower reset supervisor to guarantee proper startup and reset on brownout conditions. The 10kΩ value for R5 is recommended to avoid the possibility of PICmicro latch-up. Most of the CPU's pins are available on the Expansion Connector H3. OSC[1..2] should not be used by any external devices. RA[2..5], RB[1..6] and RG[6..7] may or may not be available to external devices, depending on which components have been stuffed on the protoboard. A Duplicate Connector H6 is provided for easy jumpering to the signals present on H3. The EDAC3 Connector H7 has all of U1's remaining pins,4 and can be used to implement external memory on an expansion card instead of on the protoboard. U8-U15 form the 16-bit-wide External Memory System. U8 and U9 demultiplex the multiplexed address and data lines of U1's AD[0..15]. ALE, -OE and WE are the control signals. The 1 Megabit (128K x 8bit) Flash memories U10 and U11 are connected in a conventional manner to span U1's 16-bit address space. The 4 Megabit (512K x 8bit) static RAMs U14 and U155 are configured such that their upper 6 address lines specify an 8K page. These Paged Address bits PA[13..18] are driven by the serial shift register U13, which is part of the protoboard's SPI chain. U13 requires a rising edge on its strobe (STB) pin in order to transfer shifted data to its outputs QA-QH. RAM vs. Flash chip-enable decoding is performed by U12. This decoding can be overridden by setting the EN_RAM signal low (0V), in which case RAM is inaccessible and the entire 16-bit external address space (i.e. all 64K words) maps to Flash. The protoboard's Flash and RAM decoding can be altered by appropriate choice of U12:

Assembly Guide


U12 EN_RAM Flash Space RAM Space RAM Banks6

74HC00 false (GND)

0000-FFFFh (64K words) -- --

74HC00 true (+5V)

0000-7FFFh (32K words)

8000-FFFFh (32K words) up to 64

74HC20 false (GND)

0000-FFFFh (64K words) -- --

74HC20 true (+5V)

0000-DFFFh (56K words)

E000-FFFFh (8K words) up to 64

Table 1: Effect of U12 on Flash and RAM Map

Note EN_RAM is reset7 at power-on by the Reset Circuitry, i.e. EN_RAM must explicitly be set (+5V) before external RAM can be accessed. Also, unlike the Serial (SPI) EEPROMs, U13's contents cannot be read via SPI. The DPDT Power Switch and Power Conditioning control power to the protoboard. In the center position, all power is off. In the up position, power comes from either the bench power supply (at J5 and J6) or the 9V battery (at B1), depending on which is greater.8 In the down position, power comes directly from the system power bus through the DB-9 connector H1 and bypasses the regulator U3. LED D3 will light whenever power is on, regardless of the source. The LM2931(A)Z-5.0 (TO-92 package) and LM2940(C)T-5.0 (TO-220 package) +5V fixed voltage regulators are automotive-grade parts which, among other things, have low quiescent currents, tolerate excess Vin, reverse hookup and shorts on the output, etc. The MAX233 RS-232 Transceiver U2 implements two RS-232 DTE (data terminal equipment) ports. Hardware handshaking is not supported. Since these DTE ports are the same (pinout- and connector gender-wise) as is commonly encountered on a PC, you will need a null-modem cable to connect to a PC. Connector H4 is connected through U2 to U1's built-in high-speed USART9 #1, making this a Hardware RS-232 Port. This port is commonly used for debugging. Connector H5 is connected through U2 to U1's built-in high-speed USART #2, making this also a Hardware RS-232 Port. In order to use this port, jumpers J1 and J2 must be connected. Black shorting blocks are provided for these jumpers. If you want to use USART #2 with a device other than U2, disconnect jumpers J1 and J2 and connect RX2 and TX2 to your device (e.g. a modem). If you still want to use RS-232 over H5, connect the two pads Z33 and Z34 to two general-purpose I/O pins on U1 and write a software UART to

Assembly Guide


5

run in U1. The speeds of a software implementation are usually much lower than those of a hardware implementation. Therefore in this configuration H5 is part of a low-speed Software RS-232 Port. 10kΩ I2C Pull-Ups are provided via jumpers J3 and J4. Only one device per I2C bus should have pull-ups enabled. Blue shorting blocks are provided for these jumpers. LED D4 is intended for use as a system status indicator. If U13 is not stuffed then D4 must be connected directly to one of U1's output pins. R7-9 provided a small measure of noise immunity for the three communication ports. R10 and C8 form a Noise Filter between signal ground (GND) and chassis ground (the shields on the DB-9s). Test Points TP1-13 are provided for DC voltages throughout the protoboard. Decoupling Caps are provided for all of the digital circuitry. Special decoupling is provided for the analog supply voltages that serve U1's A/D converter. A Breadboard Area is provided for additional on-board prototyping. GND and +5V Power Busses are provided on the left and right sides, respectively, of the breadboard area. H3's (and therefore U1's) pinout is labeled on the solder side of the PCB to facilitate connections between the processor and the breadboard area. Six Mounting Holes are provided on the PCB. They will accept 4-40 fasteners and up to .250" diameter mounting hardware (e.g. standoffs).

PCB Description The PCB is a conventional double-sided board with 8-, 25- and 50-mil10 traces on a 5 or 25mil grid with 8mil clearance rules. Only through-hole components are used. Signals are routed with 8mil traces and 45-degree bends, whereas power and ground11 are routed with 50mil traces and orthogonal bends. Additionally, no trace may enter a pad with greater than 25mil width.12 A star-grounding scheme is employed, with all ground traces emanating from the "-" terminal of the 9V battery.

Assembly Guide


Some additional text legends have been laid down on the copper layers in case the board is fabricated without soldermask and silkscreen. Two large silkscreen pads are provided for writing the serial number and a modification code directly on the PCB with a compatible marker.

Stuffing the PCB Please refer to Schematics below or cover.pdf contained in 90003Apd.zip to view the PCB with silkscreen part outlines and component designators. There are a few isuues to be aware of when populating the protoboard: U1 is socketed to enable connecting the MPLAB-ICE or PICMASTER in-circuit emulator. Note that this is not a ZIF13 socket, and therefore a PLCC extraction tool must be used to remove U1 from its socket. Therefore take extra care when removing or inserting U1. U8, U9, and U12-U15 all are socketed using low-profile sockets. By socketing these chips you can remove the External Memory System entirely in case you wish to run in U1's microcontroller mode. The prototype can accommodate two types of RAM chips 62256 (32Kx8bit) and 628512 (512Kx8bit). U14 and U15 must be of the same type and speed. 62256-type RAMs can come in two different 28-pin PDIP packages: 0.600" width and 0.300" width. In both cases, the orientation is "bottom justified" with respect to the 32-pin 628512-type RAM outlines used for U14 and U15. See Table 2, Figure 1 and Figure 2 for more information.

RAM type Width Position J7 J8

62256 0.600" Pins 1-14 & 15-28 overlap

pins 3-16 & 17-30, respectively, of 32-pin

package outline. on off

62256 0.300" Pins 1-14 are in center of 32-pin package outline.

Pins 15-28 overlap pins 17-30 of 32-pin outline.

on off

628512 0.600" Occupies all 32 pins. off on

Table 2 : Jumper Settings for different RAM types

Assembly Guide


7

Note Settings for jumpers J7 and J8 other than those shown in Table 2 are invalid. Figure 1 shows the positions for pin 1 on the center row of 28 pins when using 62256 type RAMs with 0.600" lead widths for U14 and U15.

Figure 1: Pin 1 Positions for 28-pin 0.600" RAMs

Figure 2 shows the positions for pin 1 on the center row of 28 pins when using 62256 type RAMs with 0.300" lead widths for U14 and U15.

Assembly Guide


Figure 2: Pin 1 Positions for 28-pin 0.300" RAMs

U10 and U11 are socketed using ZIF sockets. The 28- and 29-series Flash memories do not support in-circuit serial programming they must be programmed externally. By using high-quality ZIF sockets we're able to ensure a trouble-free, long life of removing the Flash memories for programming and re-installing them. The ZIF sockets accommodate DIP packages with 0.300" and 0.600" lead spacings. H1, H4 and H5 are all plug / male (exposed pins) DB-9 connectors. H2 is a socket / female (no exposed pins) DB-9 connector. Do not interchange the two types! Follow the orientation of all diodes D1-3, electrolytic capacitors C3 and C117-119 and TO-92 packages U3 and U6. Stuff only U3 or U7 not both. The holes for U7 (in a TO-220 package) are larger than, and are located above, those for U3 (in a TO-92 package). Power switch SW2 wobbles in place before soldering solder just a single terminal, and reheat if necessary to orient the switch in a proper, untilted vertical orientation. Then solder the remaining five terminals.

Assembly Guide


9

J6 is a black banana jack, J5 is a red one. These jacks are mechanically fastened (not soldered) to the PCB. To mount each one, remove both nuts and discard the solder tab. The washer immediately under the plastic body must remain on the top (component) side of the PCB. Also, unscrew the knurled upper body 2-3 turns and make sure the upper washer is as far down the threaded shaft as possible14 before proceeding. From the top side of the PCB, place the jack's screw through the PCB, screw one nut on from the back side of the PCB and tighten it down with a 5/16" nut driver you must use Loctite® or a lock washer here or else each banana jack may work its way loose. The battery clip B1 is unfortunately not keyed it can be inserted in one of two orientations. The correct orientation is with the smaller of the two terminals to the left. The correct orientations of the banana jacks and battery clip is shown in Figure 3 below:15

Figure 3: Orientation of Banana Jacks and Battery Clip

When you have finished soldering all of the components to the PCB, mount the 4-40 hardware (screw, lockwasher16 and hex standoff) at each corner to give the PCB some "legs" to raise it high enough to clear the screws of the two banana jacks.

Special Instructions for REV A Protoboards The REV A protoboards were made using Alberta Printed Circuits' (http://www.apcircuits.com/) Proto 1 protoyping service. Therefore these protoboards have neither soldermask nor silkscreen. Please note the special instructions below when stuffing these boards. Be especially careful when soldering the memory area of the board. There are many instances of two 8mil traces passing between pins on a 0.100" grid. Because there is no soldermask, it is easy to unintentionally connect a pin to a nearby trace with solder. Use a fine soldering tip and just enough solder to get the job done.

http://www.apcircuits.com/

Assembly Guide


The PCB holes for battery clip B1 are a tight fit make sure you have pushed it down flush with the PCB before soldering it in place. The ZIF sockets for U10 and U11 must be installed with their release levers at the edge of the PCB. Otherwise they will not be able to open and close correctly. The PLCC socket for U1 has a required orientation. The arrow in the socket points to pin 1. Insert the socket so that the arrow points towards connectors H3 and H6.

Testing the Populated PCB Once you have stuffed and soldered all the required components, you can test the complete protoboard. Step 1. With U1's socket empty and SW2 in the center position, connect the protoboard to a lab benchtop power supply set for Vout = 6 to 20Vdc. 6Vdc should be adequate,17 but if you have a 9Vdc, 12Vdc or 15Vdc supply that should work, too. Use test clip leads with banana plugs, black for "-" (GND) and red for "+" (+5V). If your benchtop supply has a programmable current limit, set it for around 100mA. Step 2. Turn the system on by moving SW2 to the up position. Touch each chip with your fingertip nothing should be hot. LED D3 should light up. Check TP2 for +5Vdc, using TP3 for GND (0V). If you have anything other than +5Vdc on TP2 then you may have stuffed D2 and/or U3 backwards, or you may have stuffed another component (e.g. U4 or C3) backwards. If you have +5Vdc but D3 is not lit, it's probably soldered in backwards. A fully populated board (less U1, U10, U11, U14 and U15) will draw approximately 30-60mA if substantially more current is being drawn, you may have a problem. Step 3. Check to see that U2 is functioning properly by testing TP1 and TP5 for approximately +10Vdc and 10Vdc, respectively use TP4 for GND. Step 4. Ensure that the reset circuitry is working by checking TP9 for +5Vdc. Press and release SW1 and observe the voltage dropping to 0V, and then back up to +5Vdc. Step 5. If you have a 9V battery handy, you can test it by disconnecting the bench supply and snapping a 9V battery in place

Assembly Guide


11

you should also get +5Vdc at TP2 with SW2 in the up position. If not, verify the orientation of the battery clip B1 and diode D1. Step 6. You can test the system power connector H1 by connecting a system power cable to it, moving SW2 to the down position and repeating the voltage tests above. Further Testing: At this point all of the subsystems above are probably working. Any further testing must be done with a CPU or in-circuit emulator. Note If your application fails to work when executing from Flash memory, you may have an unwanted connection in the External Memory System due to solder bridging between pins and traces (see above). "Stuck" address and data lines can easily been seen on an oscilloscope.

Using the SSDL/SCU PIC17 Protoboard A typical usage scenario is one where the protoboard is powered from a bench supply, with H2 connected to the system I2C data bus, and perhaps with H4 connected to a terminal program running on a PC. You can build additional circuitry on the protoboard by using the breadboard area. U7 (TO-220 regulator) can supply up to 1A for power-hungry components. If you plan to use an external module designed for the (original) SSDL/SCU PICmicro protoboard you'll need to ensure that the module's pinout and its software driver are compatible with H3 and U1, respectively. External modules get all of their power from the protoboard it's not necessary to hook power up to them separately. The Serial (SPI) EEPROMs are already available on the protoboard if you want to use them. You'll need to use the appropriate code module to enable their functionality in your application. If you want to use H5 as a Hardware RS-232 Port, be sure to connect jumpers J1 and J2. The PIC17C756A has up to 12 channels of 10-bit A/D. On the protoboard it is configured with AVdd = +5V and AVss = GND, with extra 0.1µF and 10µF capacitors for noise rejection and the A/D converter's supply pins. If this supply proves to be too noisy

Assembly Guide


you can isolate the pins by cutting two traces located on the top side of the board near U1 and U9 as shown in Figure 4 below:

Figure 4: Cut These Traces To Isolate A/D Converter's

Power Supply Pins

You can then feed the A/D converter with a dedicated clean supply by running wires to the two pads Z21 and Z22. The A/D converter also has selectable positive (high) and negative (low) reference voltages. If you want a range other than 0-5V, configure U1's Special Function Registers accordingly and feed RG2 and RG3 with the appropriate voltages. These two pins (VREF- and VREF+) are available on H3 and H6. The IRQ ("I"), Dallas bus ("D") and +5V Dallas ("5") signals from system connector H2 are available on individual breakout pads as shown in Figure 5 below:

Assembly Guide


13

Figure 5: Additional System Connector Breakouts

Integrating the Protoboard with MPLAB If you do not have a PICMASTER or MPLAB-ICE2000 In-Circuit Emulator (ICE), you must develop PIC17 Protoboard applications by externally programming either the processor U1 itself or the Flash memory chips U10 and U11 and then inserting them into their respective sockets. Note Repeatedly removing U1 for programming and reinserting it into its non-ZIF PLCC socket will quickly damage U1 and/or its socket. Therefore it is not recommended. Instead, use the Flash memories for non-ICE-based development. In the non-ICE, Flash-memory development environment you must have a PIC17C756A with the following configuration bits:

• PM2:PM1:PM0: 111 (Microprocessor mode) • FOSC1:FOSC0: 10 (XT oscillator)

This is not the PIC17C756A's default configuration. Therefore you must program U1's configuration words appropriately before it will execute the program stored in U10 and U11. You do not need to put an actual program (i.e. code) into U1. Setting the configuration bits only has to be done once. A PICSTART-Plus with a 68-pin PLCC adapter can be used to set the configuration bits.

Assembly Guide


Once U1 is properly configured, you need to program the Flash memories. U1's instruction word length is 16 bits. U10 and U11 are 8 bits wide. Therefore each time you change your application program you must reprogram both U10 and U11. A device programmer with the ability to "split" a source file (e.g. Intel hex) is required. Usually the first (low) device programmed will be U10, and the second (high) will be U11. If you have an ICE for development, then you can disregard the Flash memories while testing and debugging your application. Just use the ICE with U1 in either microcontroller or microprocessor18 mode. This bypasses the on-board Flash memory entirely. Note If you use microcontroller mode with an ICE, remember that your final, flash-based application cannot use PORTC, PORTD or PORTE:0-2. When you are finished, program U10 and U11 and insert them and a pre-configured PIC17C756A onto the protoboard. and your program should run.

Assembly Guide


15

Schematics

Date:

October 14, 2000Sheet

1

of

2

SizeDocument Number

REV

B90003A-1.SCH

A

Title

SSDL/SCU PIC17 Protoboard

www.pumpkinic.com

(415) 584-6360

San Francisco, CA 94112

750 Naples Street

Pumpkin, Inc.

AD0

AD1

AD2

AD3

A0

12

A1

11

A2

10

A3

9

A4

8

A5

7

A6

6

A7

5

A8

27

A9

26

A10

23

A11

25

A12

4

A13

28

A14

3

A15

31

A16

2

A17

30

D0

13

D1

14

D2

15

D3

17

D4

18

D5

19

D6

20

D7

21

O E 2 4

W E 2 9

C E 2 2

A18

1

U14

HM628512

A0

A1

A2

A3

D0

13

D1

14

D2

15

D3

17

D4

18

D5

19

D6

20

D7

21

A0

12

A1

11

A2

10

A3

9

A4

8

A5

7

A6

6

A7

5

A8

27

A9

26

A10

23

A11

25

A12

4

A13

28

O E 2 4

C E 2 2

A14

29

- W E 3 1

A15

3

A16

2

NC

30

VPP/NC

1

U10

28F010

AD0

AD1

AD2

AD3

AD[0..15]

A[0..15]

A0

A1

A2

A3

A0

A1

A2

A3

External Memory System

D0

3

D1

4

D2

7

D3

8

D4

13

D5

14

D6

17

D7

18

-OE

1

G 11

Q0

2

Q1

5

Q2

6

Q3

9

Q4

12

Q5

15

Q6

16

Q7

19

U8

74HC373N

AD0

AD1

AD2

AD3

+5V

CPU

VCC

VDD

+5V

VSS

VEE

T o S P I E E P R O M

RB2

RB3

RB1

RB0

RB1

RB2

RB3

RG4

RG5

RE3

AN11/RF7

21

AN10/RF6

22

AN9/RF5

23

AN8/RF4

24

AN7/RF3

25

AN6/RF2

26

AN5/RF1

27

AN4/RF0

28

AN3/RG0

34

AN2/RG1

33

VREF+/AN0/RG3

31

VREF-/AN1/RG2

32

AVDD

29

AVSS

30

AD0/RC0

3

AD1/RC1

67

AD2/RC2

66

AD3/RC3

65

AD4/RC4

64

AD5/RC5

63

AD6/RC6

62

AD7/RC7

61

AD8/RD0

11

AD9/RD1

10

AD10/RD2

9

AD11/RD3

8

AD12/RD4

7

AD13/RD5

6

AD14/RD6

5

AD15/RD7

4

ALE/RE0

12

-OE/RE1

13

-WE/RE2

14

RB2/PWM1

54

RB3/PWM2

57

RG5/PWM3

39

V D D2

V D D2 0

V D D3 7

V D D4 9

RB0/CAP1

59

RB1/CAP2

58

RG4/CAP3

38

RE3/CAP4

15

RA5/TX1/CK1

42

RA4/RX1/DT1

43

RG7/TX2/CK2

40

RG6/RX2/DT2

41

RA3/SDI/SDA

46

RA2/-SS/SCL

45

RB6/SCK

47

RB7/SDO

48

RA0/INT

60

RA1/TOCK1

44

RB4/TCLK12

56

RB5/TCLK3

55

V S S 1 9

V S S 3 6

V S S 5 3

V S S 6 8

OSC1/CLKIN

50

OSC2/CLKOUT

51

-MCLR/VPP

16

TEST

17U1

PIC17C756-25/L

D0

3

D1

4

D2

7

D3

8

D4

13

D5

14

D6

17

D7

18

-OE

1

G 11

Q0

2

Q1

5

Q2

6

Q3

9

Q4

12

Q5

15

Q6

16

Q7

19

U9

74HC373N

AD0

AD1

AD2

AD3

AD4

AD5

AD6

AD7

AD8

ALE

AD4

AD5

AD6

AD7

AD8

A4

A5

A6

A7

A8

A4

A5

A6

A7

A8

A9

A10

A11

A12

A13

A14

A15

AD4

AD5

AD6

AD7

A4

A5

A6

A7

A8

A9

A10

A11

A12

PA13

PA14

PA15

Z39

PAD14NC

AD4

AD5

AD6

AD7

A12

A7

A6

A5

PA14

32-pin

AD0

AD1

AD2

A4

A3

A2

A1

A0

Low

SRAM

-OE

-WE

PA16

PA18

PA17J

32-pin

-OE

-WE

Flash

ROM

Low

A9

A10

A11

A12

A13

A14

A15

AD9

AD10

AD11

AD12

AD13

AD14

AD15

ALE

-OE

-WE

ALE

AD9

AD10

AD11

AD12

AD13

AD14

AD15

(SCL)

(SDA)

RA2

RA3

RB4

RB5

RB4

RB5

RA2

RA3

RA1

RA0

(RX1)

(TX1)

(RX2)

(TX2)

RA4

RA5

RG6

RG7

RB6

RB7

RA5

RA4

IN

14

QA

15

QB

1

SCK

11

QC

2

-CL

10

QD

3

QE

4

STB

12

QF

5

-OE

13

QG

6

QH

7

OUT

9

U13

74HC595N

RG1

RG0

RF0

RF1

RF2

RF3

RF4

RF5

RF6

RF7

RB2

RB1

RB6

RAM

Page

Select

SPI

A0

A1

A2

A3

A4

A5

A6

PA13

PA14

PA15

PA16

PA17

PA18

EN_RAM

Socketed

DIP, ZIF

D0

13

D1

14

D2

15

D3

17

D4

18

D5

19

D6

20

D7

21

A0

12

A1

11

A2

10

A3

9

A4

8

A5

7

A6

6

A7

5

A8

27

A9

26

A10

23

A11

25

A12

4

A13

28

O E 2 4

C E 2 2

A14

29

- W E 3 1

A15

3

A16

2

NC

30

VPP/NC

1

U11

28F010

-CE_ROM

AD8

AD9

AD10

AD11

AD12

AD13

AD14

A0

12

A1

11

A2

10

A3

9

A4

8

A5

7

A6

6

A7

5

A8

27

A9

26

A10

23

A11

25

A12

4

A13

28

A14

3

A15

31

A16

2

A17

30

D0

13

D1

14

D2

15

D3

17

D4

18

D5

19

D6

20

D7

21

O E 2 4

W E 2 9

C E 2 2

A18

1

U15

HM628512

-CE_RAM

A0

A1

A2

A3

A4

A5

A6

Socketed

DIP,

AD8

AD9

AD10

AD11

AD12

AD13

AD14

Z40

PAD14NC

AD15

A12

A7

A6

A5

A4

A3

PA14

A7

A8

A9

A10

A11

A12

PA13

PA14

PA15

PA16

PA17J

AD15

D4

LED

R11

470

A7

A8

A9

A10

A11

A12

A13

A14

A15

Socketed

TP10TP

TP11TP

2 1Z21

VIA

-MCLR

RG3

RG2

AVDD

AVDD

AVSS

C1

22P

C2

22P

R6

1M

Y1

16MHz

OSC1

-MCLR

Oscillator

TP9

TP

R5

10K

OSC2

EDAC

Connector

Duplicate

Connector

A/D Test

Points

and

Dedicated

Feeds

AVDD

AVSS

AVDD

AVSS

Expansion

Connector

TP12TP

2 1 Z22

VIA

TP13TP

RG3

RG2

AVSS

+5V

Flash

ROM

High

Socketed

32-pin

DIP, ZIF

-OE

-WE

-CE_ROM

PA17

+5V

SRAM

High

J7

JUMPER

J8

-OE

-WE

-CE_RAM

PA18

PA17J

Socketed

32-pin

DIP,

AD8

AD9

A2

A1

A0

AD10

U1 in microprocessor mode

E000-FFFFh: external RAM, 8K word per page,

lower 56K words in use

0000-DFFFh: external ROM,

MM628512: 1Mbyte total

MM62256: 64Kbyte total

MM628512: J7 open, J8 closed

MM62256: J7 closed, J8 open

1

2

6 4

5

U12A

74HC20N

-CE_RAM

RB7

RB6

RB5

RB4

RB3

RB2

RB1

RB0

A13

A14

A15

RF7

+5V

1 3 5 7 9 11

13

15

17

19

21

23

25

27

29

31

33

35

37

39

2 4 6 810

12

14

16

18

20

22

24

26

28

30

32

34

36

38

40

H3

H-BOX2X20

RG0

RG1

RG2

RG3

RA1

-MCLR

-OE

-WE

RA0

RE3

+5V

+5V

1 3 5 7 9 11

13

15

17

19

21

23

25

27

29

31

33

35

37

39

2 4 6 810

12

14

16

18

20

22

24

26

28

30

32

34

36

38

40

H6

H-BOX2X20

RG0

RG1

RG2

RG3

RA1

-MCLR

RB7

RB6

RB5

RB4

RB3

RB2

RB1

RB0

RF7

-OE

-WE

RA0

RE3

+5V

1 3 5 7 9 11

13

15

17

19

2 4 6 8101214161820

H7

H-BOX2X10

ALE

-OE

-WE

AD0

AD2

AD4

AD6

AD8

AD10

AD12

AD14

AD1

AD3

AD5

AD7

AD9

AD11

AD13

AD15

AVDD

Reset

Circuitry

R2

10K

I N2 -RESET1

G N D 3

U6

MC33164P-5

+5V

RESET

C5

0.1U

SW1

KEY-TACT

OSC1

OSC2

RF0

RF1

RF6

RF5

RF4

RF3

RF2

RA2

RA3

RA5

RA4

RG4

RG5

RG6

RG7

OSC1

OSC2

RF0

RF1

RA2

RG4

RG5

RG7

(C) 2000 Pumpkin, Inc.

RF6

RF5

RF4

RF3

RF2

RA3

RA5

RA4

RG6

drawn by: AEK

|LINK

|90003A-2.SCH

9

10

8 12

13

U12B

74HC20N

-CE_ROM

Figure 6: First Page of Schematics

Assembly Guide


Date:

October 14, 2000Sheet

2

of

2

SizeDocument Number

REV

B90003A-2.SCH

A

Title

SSDL/SCU PIC17 Protoboard

www.pumpkinic.com

(415) 584-6360

San Francisco, CA 94112

750 Naples Street

Pumpkin, Inc.

I2C

Pull-Ups

J3

JUMPER

J4

JUMPER

+5V

omitted by not stuffing U12-15.

like U4-5, has its own strobe.

external RAM.

8. External RAM system may be

9. U13 is on software SPI chain

10. EN_RAM must be high to access

startup with quiet power sources.

5. R6 guarantees oscillator

4. LM78(L)05 may be used as a

lower-performance alternative

for automotive-grade LM2930-

and LM2940-series regulators.

to a PC, use a null-modem cable

omitted by not stuffing them.

with female (socket) DB-9

connectors on both ends.

Notes:

1. To connect either RS-232 port

2. B1, D1-2, J5-6 and U6 may be

VCC

VDD

+5V

VSS

VEE

Power

Connector

System

3. R7-10 may be omitted by

1

2

3

4

5

6

7

8

9

1 01 1

H1

DB-9P

jumpers (i.e. shorts).

replacing them with 0-Ohm

TP6

TP

13 2456SW2

DPDT-PC

+5V_SYS

immunity

DPDT POWER SWITCH:

6. R7-10 provide RS-232 noise

pins are pulled high via R3-4.

7. RA2-3 (open drain, high-current)

11. H3 is partially compatible with

SSDL PIC Protoboard’s H3.

RA2

RA3

Serial

(SPI)

EEPROM

( I2C DATA )

( I2C CLK )

(IRQ)

R3

10K

R4

10K

Z30PAD

Z31PAD

I2C

Connector

System

1

2

3

4

5

6

7

8

9

1 01 1

H2

DB-9S

(DALLAS)

(+5V_DALL)

R7

10

Z32PAD

RB4

+5V

( s/w SCK )

( s/w SD0 )

( s/w SDI )

CS

1

SDO

2

WP

3

HOLD

7

SCK

6

SDI

5

U4

25AA640/P

CS

1

SDO

2

WP

3

HOLD

7

SCK

6

SDI

5

U5

25AA640/P

RB1

RB3

RB2

+5V

off

bench

or

batt

mid

----

---

up

down

----

system

power

conn.

3

1

2

U3

LM2931AZ-5.0

VIN

+5V

TP7

TP

D1

1N4001

VBATT

- 1

+2

B1

9VCLIP-968

CHASSIS

red

1

J5

BINDPOST

1

J6

BINDPOST

Power

Conditioning

C4

0.1U

TP8

TP

D2

1N4001

VBENCH

GND

C3

10U-100

R1

470

D3

LED

green

J2

JUMPER

J1

Z33

PAD

Z34

PAD

RA5

RA4

RG7

RG6

( USART2 -> )

( USART2 <- )

( USART1 -> )

( USART1 <- )

Socketed

C1+

8

C1-

13

P W R7

G N D 6

O1

5

I1

2

O2

3

I2

4

I3

1

O3

18

O4

20

I4

19

C2+11

C2-16

V-

12

V-

17

V+

14

C2+15

C2-10

G N D 9

U2

MAX233CPP

( -> )

( <- )

RS-232

Transceiver

R8

10

RB5

+5V

DTE

RS-232

port

Hardware

1

2

3

4

5

6

7

8

9

1 01 1

H5

DB-9P

1

2

3

4

5

6

7

8

9

1 01 1

H4

DB-9P

R9

10

+10V

-10V

Miscellaneous Parts

Z22

Socket, 68-pin, PLCC

Z19

Socket, 32-pin, DIP/0.600"

Z18

Socket, 32-pin, DIP/0.600"

Z1

PCB, SSDL PIC17 PROTOBOARD

Z23

SBlock, 0.100", black

Z2

Socket, ARIES 32-6554-11

Z3

Socket, ARIES 32-6554-11

Z20

Socket, 8-pin, DIP

Z21

Socket, 8-pin, DIP

C105

0.1U

Decoupling Caps

C102

0.1U

C103

0.1U

C104

0.1U

black

C101

0.1U

+5V

C106

0.1U

C111

0.1U

+5V

+5V

C107

0.1U

C108

0.1U

C109

0.1U

C113

0.1U

C114

0.1U

C112

0.1U

C110

0.1U

C115

0.1U

Z27

Screw, 4-40 slotted pan head (x6)

Z28

Washer, 4-40 split-lock (x6)

Z29

Stdoff, 4-40 Hex 0.187"x.562" (x6)

Z26

SBlock, 0.100", blue

Z25

SBlock, 0.100", blue

Z24

SBlock, 0.100", black

Z35

Socket, 14-pin, DIP

Z36

Socket, 16-pin, DIP

Z37

Socket, 20-pin, DIP

Z38

Socket, 20-pin, DIP

Alternate

(Hi-Power

TO-220)

Regulator

I 1

O3

G 2

U7

LM2940CT-5.0

VIN

+5V

( -> )

( <- )

Noise

R101M

C8

0.1U

Hardware

DTE

RS-232

port

(Debug)

Filter

Z14Z15Z16Z17

Z8

Z9

Z10Z11Z12Z13

Z4

PAD15NCZ5

Z7

Z6

+5V

C119

10U-100

AVDD

AVSS

C116

0.1U

C118

10U-100

C117

10U-100

+5V

Mounting

Holes

ZH1

PAD4

ZH2

PAD4

ZH3

PAD4

ZH4

PAD4

ZH6

PAD4

ZH5

PAD4

Test Points

TP1

TP

TP2

TP

TP3

TP

+5V

+10V

TP4

TP

TP5

TP

-10V

Power Busses & Breadboard Area

(C) 2000 Pumpkin, Inc.

drawn by: AEK

Figure 7: Second Page of Schematics

Assembly Guide


17

PCB Layers

Figure 8: PCB Topside Plot

Assembly Guide


Figure 9: PCB Top Routing Layer

Assembly Guide


19

Figure 10: PCB Bottom Routing Layer

Assembly Guide


1 The PIC17C756 (an earlier version) may also be used. The PIC17C756A

supports in-circuit serial programming (ICSP). 2 It may be ancient, but it's also reliable. 3 Error Detection And Correction. May refer to memory (and other) systems

which employ a system for determining which copies of multiple instances of important information are still valid in the event of partial corruption.

4 Except AVss, which is not available on any connector. AVss is the A/D converter's lesser supply voltage. AVss must equal Vss on U1.

5 256 Kilobit RAMs (generic type 62256) can also be used. 6 The number of RAM banks is dependent on the size of the RAMs. 7 The resetting of EN_RAM on REV A protoboards is unreliable because of

potential noise on PORTB:6 during reset. Your application should explicitly configure EN_RAM at system startup.

8 That's what diodes D1 and D2 are for. 9 Universal Synchronous/Asynchronous Receiver/Transmitter. 10 One thousandth of one inch, i.e. 0.001". 11 Chassis shields are routed at 25mils on this PCB. 12 This ensures that components can be desoldered with 50mil traces entering a

pad, the heatsink effect greatly reduces one's ability to successfully desolder the component without damaging the trace(s) or pad(s).

13 Zero Insertion Force. 14 This guarantees that the fastening screw that goes through the PCB is extended

to its full length. 15 J5 is shown in red. 16 On top of PCB. 17 This assumes you are using an LM2931- or LM2940-series low-dropout voltage

regulator. If you have substituted a lower-performance part, like a 7805, you may need to raise the voltage to > 7Vdc.

18 In MPLAB, select Memory: Supplied by Emulator under Options > Development Mode > Off-Chip Memory

assembling the ssdl/scu pic17 protoboard

Documents