Specifications

WM_PRJ_Q2400_PTS_002 - 001
24th October 2002
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2.12.3 Speaker outputs
2.12.3.1 Speaker 2 Outputs
Pin description
Signal Pin # I/O I/O type Description
SPK2P 45 O Analog Speaker 2 positive output
SPK2N 47 O Analog Speaker 2 negative output
2.12.3.2 Speaker 1 Outputs
Pin description
Signal Pin # I/O I/O type Description
SPK1P 41 O Analog Speaker 1 positive output
SPK1N 43 O Analog 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.
C1
D1
VBATT
???
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 Pin # I/O I/O type Description
BUZ 49 O Analog Buzzer output