ST 9100 - HARDWARE GUIDE
PIN Function Type Description
8 Output_6 O Open drain output
9 1Wire Com PWR 1-WIRE return path
10 Console_RS232_TX O ±15 kV ESD protected, RS-232 level (nominally ±5.5 V) transmitter outputs
11 AUX_RS232_RX I TTL/CMOS level receiver outputs
12 CAN1_H I/O High level CAN BUS line
13 CAN1_L I/O Low level CAN BUS line
14 CAN0_L I/O Low level CAN BUS line
15 RS485_B I/O Half duplex RS485 driver output or receiver input (complementary to RS485_A)
16 Digital/Analog_IN1 /
0-5 V_IN1 /
P1_4-20 mA+
I Digital input or 0-5 V analog input or 4-20 mA
17 I/O_3 I/O Multifunction GPIO, push-pull, analog input and current sink
18 I/O_1 I/O Multifunction GPIO, push-pull, analog input and current sink
19 Output_5 O Open drain output
20 1Wire_DATA I/O Input/output driver for 1-Wire Line
21 Console_RS232_RX I TTL/CMOS level receiver outputs
22 AUX_RS232_TX O ±15 kV ESD protected, RS-232 level (nominally ±5.5 V) transmitter outputs
23 CAN0_H I/O High level CAN BUS line
24 Digital/Analog_IN2 /
0-5 V_IN2 /
P2_4-20 mA+
I Digital input or 0-5 V analog input or 4-20 mA
2.4 I/O Interface
2.4.1 Standard General Purpose I/Os
The transceiver supports four configurable general purpose I/Os (GPIO I/O_1 to I/O_4):
l Digital input with weak (1 MΩ) pull-down
l Digital input with 20-50 K pull-down
l Digital input with 20-50 K pull-up
l Analog input
l Digital output – push-pull
l Digital output – open drain switch-to-ground
l Disabled
On certain vehicles, I/O_1 can be used to monitor ignition. The voltage on the I/O pin may not drop low enough to
present a logic zero to the host processor when the ignition is turned off. In such a case I/O_1 can be configured to
switch in a 4 kOhm load to draw the voltage below the logic zero threshold level of the host processor ensuring a
logic zero. The other I/O ports should not be used for ignition monitoring. Refer to section 2.4.1.1
I/O_4 provides dedicated overcurrent/short circuit protection circuitry when operated in the open drain, switch-to-
ground mode. The other I/Os do not have this circuitry therefore I/O_4 is recommended for applications requiring
overcurrent/short circuit protection.
T413, Version 0.04 BETA © ORBCOMM
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