BenQ
Rev 1.0
3.8 Buzzer circuit
VBAT
C59
22P J
R48
0
U13
BUZZER
3
4
BQ3
BC817-40W
1
2
3
R45
1K
T10
TVS, NM
1
2
.
.
D11
RB520S-30
1
2
BGND
BGND
BGND
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. D11 is used to feedback EMF. Under the
condition of VBAT = 3.6V, the average current is 80mA.
28
Содержание C200
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Страница 4: ...4 May 19 2003 6809464A58 Contents Product Family D10 ...
Страница 18: ...18 May 19 2003 6809464A5 O General Operation Product Family D10 PRELIMINARY ...
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Страница 85: ...BenQ Rev 1 0 44 ...
Страница 86: ...BenQ Rev 1 0 45 ...
Страница 87: ...BenQ Rev 1 0 46 ...
Страница 88: ...BenQ Rev 1 0 47 ...
Страница 89: ...BenQ Rev 1 0 48 ...
Страница 90: ...BenQ Rev 1 0 49 ...
Страница 91: ...BenQ Rev 1 0 Radio Frequency function Descriptions Top Side 50 Bottom Side ...
Страница 92: ...BenQ Rev 1 0 51 ...
Страница 95: ...BenQ Rev 1 0 54 Apollo Block Diagram ...
Страница 96: ...BenQ Rev 1 0 Tx Block Diagram 55 ...
Страница 97: ...BenQ Rev 1 0 56 Rx Block Diagram ...
Страница 98: ...BenQ Rev 1 0 57 TX Front End EGSM DCS ...
Страница 99: ...BenQ Rev 1 0 58 Rx Front End EGSM DCS ...
Страница 100: ...BenQ Rev 1 0 59 RF power management ...
Страница 101: ...BenQ Rev 1 0 60 Tx Power ...
Страница 102: ...BenQ Rev 1 0 VCXO 61 ...
Страница 103: ...BenQ Rev 1 0 Base Band full schematic 62 ...
Страница 104: ...BenQ Rev 1 0 RF full schematic 63 ...
Страница 140: ...BenQ Rev 1 0 Replacement Parts Exploded View 99 Fig 1 Mechanical Exploded View I ...
Страница 141: ...BenQ Rev 1 0 Fig 2 Mechanical Exploded View II 100 ...
Страница 142: ...BenQ Rev 1 0 Fig 3 Mechanical Exploded View III 101 ...