Specifications

Cinterion
®
EXS62-W/EXS82-W Hardware Interface Description
2.1 Application Interface
61
t EXS62-W_EXS82-W_HID_v01.200ee 2022-09-07
Public/ Released
Page 39 of 144
2.1.9 I
2
C Interface
The embedded processing option of EXSx2-W provides an inter-integrated circuit interface. I
2
C
is a serial, 8-bit oriented data transfer bus for bit rates up to 400kbps in Fast mode. It consists
of two lines, the serial data line I2CDAT and the serial clock line I2CCLK. The module acts as
a single master device, e.g. the clock I2CCLK is driven by the module. I2CDAT is a bi-direc-
tional line. Each device connected to the bus is software addressable by a unique 7-bit ad-
dress, and simple master/slave relationships exist at all times. The module operates as master-
transmitter or as master-receiver. The customer application transmits or receives data only on
request of the module.
The I
2
C bus can be configured and activated via embedded application. For more information
see [10].
The I
2
C interface can be powered via the V180 line of EXSx2-W. If connected to the V180 line,
the I
2
C interface will properly shut down when the module enters the Power Down mode.
In the application I2CDAT and I2CCLK lines need to be connected to a positive supply voltage
via a pull-up resistor. For electrical characteristics please refer to Table 2.
Figure 17: I
2
C interface connected to V180
Note 1: Good care should be taken when creating the PCB layout of the host application: The
traces of I2CCLK and I2CDAT should be equal in length and as short as possible.
I2CCLK
I2CDAT
GND
I2CCLK
I2CDAT
GND
Module Application
V180
R pull up R pull up R pull up R pull up