User Manual

Module Specification
NO. AT357HP
TITLE:
Module, ZigBee, 17.9 x 24.9 x 2.75mm, 51 I/O, Edge Castellated, SMD
REVISION DATE: 8 April 2013 ISSUE: O PAGE: 18 of 27
• TWI (Two Wire Serial Interface)
TWI
pin
Module Pin Number
GPIO Port
SC2SDA (open drain)
17
PA1
SC2SCL (open drain)
18
PA2
Table 10: TWI Pins
Figure 10a. Host uC to AT357 module via I2C Interface
AT357 can support external I2C devices such as sensor board to provide wireless sensing
application.
Figure 10b. AT357 module to external I2C device
Host uC
Master SDA
Master SCL
AT357
PA1
PA2