SIM340 Hardware Design
3.10 Buzzer
The BUZZER on the board-to-board connector can be used to drive a buzzer to indicate incoming
call. The output volume of buzzer can be set by “AT+CRSL”. The reference circuit for buzzer
shown as following figure:
MOD
U
LE
4.7K
47K
VBAT
BUZZER
Figure 26: Reference circuit of Buzzer
Table
14
: Buzzer Output
Characteristics
Parameter
Min
Typ
Max
Unit
Working Voltage 2.4
2.8
3.3
V
Working Current
2
mA
Load Resistance 1
k Ohms
3.11 SIM card interface
3.11.1 SIM card application
You can use AT Command to get information in SIM card. For more information, please refer to
document [1]
.
The SIM interface supports the functionality of the GSM Phase 1 specification and also supports
the functionality of the new GSM Phase 2+ specification for FAST 64 kbps SIM (intended for use
with a SIM application Tool-kit).
SIM340_HD_V3.09
18.03.2009
43
