H350 LGA Serials Module Hardware User Manual Page 29 of 37
5.5.3
Ring Indicator
UART1_R1 is used for indicating incoming call and SMS, sending pulse to host application program.
Operation Mode
Status
Default mode
Low level
Ringing
1s high level, 1s low level, cycling
Incoming message
150ms pulse
5.6
USIM
H350 wireless communication module supports USIM and high speed SIM card, does not support 8 line smart
USIM yet.
5.6.1
USIM Interface
Pin#
Pin Name
I/O
Description
26
USIM_VCC
O
USIM power supply output
25
USIM_RST
O
USIM Reset signal
24
USIM_CLK
O
USIM clock signal
23
USIM_IO
I/O
USIM data signal
28
GND
GND
USIM ground
27
USIM_CD
I
USIM insert detect signal
High level indicates SIM card is not inserted
Low level indicates SIM card is inserted