Telit Wireless Solutions LM940 Design Guide

LM940 Hardware Design Guide
1VV0301352 Rev. 18 Page 48 of 75 2022-01-04
Not Subject to NDA
6.6.4.2. Using a GPIO Pin as Output
GPIO pins, when used as outputs, can drive 1.8V CMOS digital devices or compatible
hardware. When set as outputs, the pins have a push-pull output, and therefore the pull-
up resistor can be omitted.
Figure 18: GPIO Output Pin Equivalent Circuit
6.6.4.3. Dedicated I/O
To use SIMIN functions, host must use GPIO_01/GPIO_02.
Pin
Signal
IO/Level
Dedicated Function
3
GPIO_01
Input/1.8V
Can be used as SIMIN1 function
5
GPIO_02
Input/1.8V
Can be used as SIMIN2 function
Table 31: Dedicated I/O
Below functions are not dedicated to specific GPIO.
Customer use one of GPIOs (GPIO_03 to GPIO_08) as these functions by AT command.
• Boot OK
• Shutdown Indicator
• Shutdown Trigger
• Dying Gasp Trigger
Pin
Signal
IO/Level
Dedicated Function
44
GPIO_03
I/O, 1.8V
Can be used as specific functions.
46
GPIO_04
I/O, 1.8V
Can be used as specific functions.

Telit Wireless Solutions LM940 Specifications

General

Brand	Telit Wireless Solutions
Model	LM940
Category	Wireless modules
Language	English