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H330S Hardware User Manual
Page 35 of 44
5.5.3Ring Indication
UART1_RI signal is used to indicate the incoming calls and SMS, and dispatch pulses to the host
application.
Working modes
Status
Default status
Low level
Incoming call ring
1s high level, and 1s low level, repeat this.
New SMS
150ms pulse
5.6 USIM Interface
H330S series wireless modules support USIM and high speed SIM cards. For now, they do not support
8-line intelligent USIM.
5.6.1 USIM Pins
Pin#
Pin Name
I/O
Function Description
5
USIM_VCC
O
USIM power supply signal
6
USIM_RST
O
USIM Reset signal
7
USIM_CLK
O
USIM clock signal
8
USIM_IO
I/O
USIM data signal
12
GND
GND
USIM ground signal
4
USIM_CD
I
USIM Plug-in detection signal
The internal module has been pulled up.
High level indicates that SIM card is not inserted.
Low level indicates that card is inserted.
5.6.2 USIM Design
Reference Circuit Design: