User Manual

APEX/APEX LT
Datasheet (Preliminary Rev 0.2) www.lsr.com Page 5 of 20
6.1 The I/O pin assignments for the APEX module
Pin
#
Name Type Description
1 GROUND GND Ground
2 GROUND GND Ground
3 GROUND GND Ground
4 VDD PI Power Supply Input
5 RSTB DI Reset, active low
6 GPIO11 DI/DO General Purpose Digital I/O, SC1 UART CTS, SC1 SPI master
clock, or Capture Input A of Timer 2
7 GPIO12 DI/DO General Purpose Digital I/O, SC1 UART RTS, or Capture
Input B of Timer 2
8 GPIO0 DI/DO General Purpose Digital I/O, SC2 SPI MOSI, or Capture
Input A of Timer 1
9 GPIO1 DI/DO General Purpose Digital I/O, SC2 SPI MISO, SC2 I
2
C SDA,
or Capture Input A of Timer 2
10 GPIO2 DI/DO General Purpose Digital I/O, SC2 SPI master clock, SC2 I
2
C
SCL, or Capture Input B of Timer 2
11 GPIO3 DI/DO General Purpose Digital I/O, SC2 SPI slave select, or
Capture Input B of Timer 1
12 GPIO4 DI/DO/AI General Purpose Digital I/O, ADC Input 0, or PTI frame
signal
13 GPIO5 DI/DO/AI General Purpose Digital I/O, ADC Input 1, or PTI data signal
14 GPIO6 DI/DO/AI General Purpose Digital I/O, ADC Input 2, Timer 2 Clock
Input, or Timer 1 Enable
15 GPIO7 DO Regulator Enable, active high (see section 8)
16 GPIO8 DI/DO/AO General Purpose Digital I/O, ADC Reference Output, Timer 1
Clock Input, Timer 2 Enable, or Source A Interrupt
17 GPIO9 DI/DO General Purpose Digital I/O, SC1 TXD, SC1 MO, SC1 I
2
C
Data, or Capture Input A of Timer 1
18 GPIO10 DI/DO General Purpose Digital I/O, SC1 RXD, SC1 MI, SC1 I
2
C
Clock, or Capture Input B of Timer 1
19 CLK DI SIF Interface clock
20 MISO DO SIF Interface master in/slave out
21 MOSI DI SIF Interface master out/slave in
22 LOADB DI/DO SIF Interface load strobe
23 GPIO16 DI/DO General Purpose Digital I/O, Output B of Timer 1, Capture
Input B of Timer 2, or Source D Interrupt
24 GPIO15 DI/DO General Purpose Digital I/O, Output A of Timer 1, Capture
Input A of Timer 2, or Source C Interrupt
25 GPIO14 DI/DO General Purpose Digital I/O, Output B of Timer 2, Capture
Input B of Timer 1, or Source B Interrupt
26 GPIO13 DI/DO General Purpose Digital I/O, Output A of Timer 2, or
Capture Input A of Timer 1
27 GROUND GND Ground
28 GROUND GND Ground
Unused I/O pins should be left unconnected and the pin state set via the Host Protocol.
DI = Digital Input PI = Power Input AI = Analog Input
DO = Digital Output GND = Ground AO = Analog Output