Cinterion
®
ELS31-VA/ELS51-VA Hardware Interface Description
2.1 Application Interface
56
ELS31-VA_ELS51-VA_HID_v01.000
2017-01-04
Confidential / Preliminary
Page 37 of 106
The following figure shows the startup behavior of the I
2
C interface. With an active state of the
ASC0 interface (i.e. CTS0 is at low level) the initialization of the I
2
C interface is also finished.
Figure 15:
I
2
C startup behavior
I2CCLK
I2CDAT
Open drain
Open drain
(external pull up)
(external pull up)
CTS0
ON
EMERG_RST
Power supply active
Start up
Firmware
initialization
Command interface
initialization
Interface
active
V180
VCORE
Reset
state