Nokia 6310i Service Manual page 91

PAMS Technical Documentation
%X]]HU (OHFWULF ,QWHUIDFH
7KH GULYHU FLUFXLW LV DQ LQWHJUDO SDUW RI WKH 8(0
UEM
BUZZPWM
Parameter
Output switch resistance Rbuzzo
Output peak sink current Iout
Output peak sink voltage Uout
Output pwm duty cycle Pdcyc
Buzzer coil resistance Rload
Battery voltage VBAT
Reverse diode peak current Iforw
Output frequency Fout, GSM system
7KH EX]]HU LV FRQWUROOHG IURP WKH 8(0 E\ D 3:0 3XOVH :LGWK 0RGXODWHG VTXDUH ZDYH
VLJQDO
7KH IUHTXHQF\ LV SURGXFHG E\ D ELWVWUHDP RQ UHJLVWHU %8==)5(45 WKDW LV FRXQWHG
WKURXJK D  ELW DFFXPXODWRU
=
F F
out BuzzClk
%X]]&ON KDV WKH VDPH IUHTXHQF\ DV WKH &%XV&ON  0+] IRU *60 
,VVXH  $SULO 
5kOhm
+/- 35%
Figure 13. Buzzer driver circuit.
7DEOH 
Buzzer driver specifications
Variable
VBAT
VBAT
Ni or Li battery
tp = 10 us
+
21
/(( 2 / BuzzFreqR ) ) 1
1RNLD &RUSRUDWLRQ
VBATDriv
VBAT
1 uF
BUZZER
BUZZO
12 pF
VSADriv2
Min Typ
1.0 2.7
120 180
0.5
13 16
3.03 3.6
0.48 2500
NPL-1
3 - Audio System
Max Unit
4.5 Ohm
350 mA
1.2 V
50 %
19 Ohm
5.2 (Ni) V
4.2 (Li)
0.35 A
7751 Hz
3DJH