Motorola D10 Service Manual page 69

BenQ
3.8 Buzzer circuit
U13
BUZZER
BU
Description
To alert the buzzer, Ulysse applies PWT (Pulse Width Tone) signal at
BU to drive the buzzer. R45 and R48 are used to make BQ3 working
in saturation mode.
condition of VBAT = 3.6V, the average current is 80mA.
3
4
C59
22P J
BGND
R45
1
1K
D11 is used to feedback EMF.
28
T10
TVS, NM
BGND
3
BQ3
2
BC817-40W
R48
0
BGND
Rev 1.0
VBAT
D11
RB520S-30
Under the