User's Guide

LM940 HW Design Guide
1VV0301352 Rev. 2 Page 42 of 68 2017-07-19
6.5.3.3. WAN_LED_N
The WAN_LED_N signal drives the LED output.
The recommended WAN_LED_N connection is the following:
Recommended WAN_LED_N connection
6.5.4. General Purpose I/O
The general-purpose I/O pins can be configured to act in three different ways:
 Input
 Output
 Dedicate Function (Customer Requirement)
Input pins can only be read and report digital values (high or low) present on the pin at the
read time. Output pins can only be written or queried and set the value of the pin output.
The following GPIOs are always available as a primary function on the LM940.
Below table lists the GPIO signals of LM940.
GPIOs
Pin no. Signal I/O Function Type Drive
Strength
3 GPIO_01 I/O Configurable
GPIO
CMOS
1.8V
2-16 mA
5 GPIO_02 I/O Configurable
GPIO
CMOS
1.8V
2-16 mA
44 GPIO_03 I/O Configurable
GPIO
CMOS
1.8V
2-16 mA
46 GPIO_04 I/O Configurable
GPIO
CMOS
1.8V
2-16 mA