SIM802 Hardware Design
3.18 Buzzer
The buzzer 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
ULE
4.7K
47K
VBAT
BUZZER
Figure 35: Reference circuit of Buzzer
Table 26: Buzzer output characteristics
Parameter
Min
Type
Max
Unit
Working Voltage 2.4
2.8
3.3
V
Working Current
2
mA
Load Resistance 1
k Ohms
SIM802_HD_V2.01
12.01.2010
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