wiki:MotherboardDesignNotes

Wiring

There will be (16) 14-pin headers for vial controls. The pinout is as follows:

*Pin* *Function* *Module No*
1 Spare_A + 7
2 Spare_A - 7
3 Spare_B + 6
4 Spare_B - 6
5 PhotoDiode + 5
6 PhotoDiode - 5
7 LED + 4
8 LED - 4
9 TempSensor + 3
10 TempSensor - 3
11 Heater + 2
12 Heater - 2
13 Motor + 1
14 Motor - 1

There will be (7) sites for plug-in Analog or PWM boards. Each plug-in module will have two 25-pin headers with pinout given below. In addition there are two 10-pin headers on the PWM boards to supply 24V power.

Left Right
1 GND Signal GND 2 Signal GND
3 CH00 Analog In/Out channel 0 4 Analog In/Out channel 1
5 PWR Analog Power (24V) 6 Analog Power (24V)
7 CH02 Analog In/Out channel 2 8 Analog In/Out channel 3
9 PWR Analog Power (24V) 10 Analog Power (24V)
11 CH04 12
13 PWR 14
15 CH06 16
17 PWR 18
19 GND 20
21 CH08 22
23 PWR 24
25 CH10 26
27 PWR 28
29 CH12 30
31 PWR 32
33 CH14 34
35 PWR 36
37 GND Signal GND 38 Signal GND
39 CTRL0 Control logic I/O 0 40 Analog Ref
41 CTRL1 Control logic I/O 1 42 Analog Out
43 CTRL2 Control logic I/O 2 44 -spare-
45 CTRL3 Control logic I/O 3 46 5V
47 CTRL4 Control logic I/O 4 48 5V
49 GND Signal GND 50 Signal GND

There will be four sites for ARM processor modules (SparkFun? SAM D21 mini breakout) with 24 pins each. Wiring to the analog/PWM sites will be as shown in the block diagram. Below is the pin wiring for the processor sites. Note that the odd numbering matches that on the SparkFun? schematic.

Left Right
Route to RS-485 TXn Tx 12 1 Vin 5V
Route to RS-485 RXn Rx 11 2 GND GND
-nc- nRST 10 3 AREF -nc-
GND GND 9 4 3.3V -nc-
CTRL0 to PWM D2 8 5 A3 CTRL3 to ADC
CTRL1 to PWM D3 7 6 A2 -nc-
CTRL2 to PWM D4 6 7 A1 -nc-
CTRL3 to PWM D5 5 8 A0 ADC Analog Out
CTRL4 to PWM D6 4 9 D13/SCK -nc-
CTRL0 to ADC D7 3 10 D12/MISO -nc-
CTRL1 to ADC D8 2 11 D11/MOSI RS-485 TXEn
CTRL2 to ADC D9 1 12 D10/SS -nc-

There will be one site for a four-channel RS-485 transceiver board. Pinout below.

Left ----- Right
1 GND GND 1
2 Tx1 Tx3 2
3 Rx1 Rx3 3
4 En1 En3 4
5 Tx2 Tx4 5
6 Rx2 Rx4 6
7 En2 En4 7
8 5V A 8
9 GND B 9

Power

  • Samtec "Power Mate" Family (~10A/pin)
    • PMSS series cables, mates with IPBT connectors
  • Molex ultra-fit (~10A/pin)
    • WM11876-ND (header)
    • WM11642-ND (plug)
    • WM11558CT-ND (crimp terminal 16-18 AWG)

Other Notes

Need RS-485 transceivers, e.g. Digi-Key 497-6540-1-ND

Last modified 6 years ago Last modified on Jul 5, 2016, 12:52:41 PM