Q2426B
| Model | Q2426B |
| Description | SELF CONTAINED E GSM/GPRS 900/1800 OR 850/1900 BI BAND MODULE |
| PDF file | Total 81 pages (File size: 909K) |
| Chip Manufacturer | ETC |
WM_PRJ_Q2400_PTS_002 - 002
24th January 2003
2.12.3 Speaker outputs
2.12.3.1 Speaker 2 Outputs
Pin description
Signal
SPK2P
SPK2N
Pin #
45
47
I/O
O
O
I/O type
Analog
Analog
Description
Speaker 2 positive output
Speaker 2 negative output
2.12.3.2 Speaker 1 Outputs
Pin description
Signal
SPK1P
SPK1N
Pin #
41
43
I/O
O
O
I/O type
Analog
Analog
Description
Speaker 1 positive output
Speaker 1 negative output
2.12.4 Buzzer Output
The buzzer output is a digital one. A buzzer can be directly connected between
this output and VBATT. The maximum current is 80 mA (PEAK). A diode
against transient peak voltage must be connected as described below.
VBATT
D1
C1
???
Figure 8 : Buzzer connection
R1 must be chosen in order to limit the current at I
PEAK
max.
C1 = 0 to 100 nF (depending on the buzzer type).
Recommended characteristics for the buzzer :
•
•
•
Type : electro-magnetic.
Impedance : 7 to 30
Ω
Sensitivity : 90 dB SPL min @ 10 cm
Pin description
Signal
BUZ
Pin #
49
I/O
O
I/O type
Analog
Description
Buzzer output
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