MB3829 Datasheet, PDF (7/24 Pages) Fujitsu Component Limited. – System Power Supply IC for Mobile Telephone

(6) ON/OFF setup conditions for individual channels
ON/OFF switching
section
ON2
OFF
CTL2
L
H
´
CTL3
´
REG1 REG2 REG3
OFF (standby mode)
L
L
OFF
OFF
H
L
ON
OFF
H
L
ON
L
H
OFF
ON
H
H
ON
ON
REG4
Battery
backup
ON
ON
MB3829
2. Speaker amplifier section
A BTL - output type amplifier is used to drive the speaker directly. The typical output power is as high as 90 mW (at
32 W), and the SB pin provides ON/OFF control.
The CHOICE pin controls earphone selection.
3. Sounder section
This section incorporates three low - saturation output transistors for driving the buzzer. IN1, IN2, and IN3 are used
to select the output transistor.
4. Voltage monitoring section
This section incorporates the REG1 output voltage detection function and watchdog timer function. It outputs a reset
signal to the RESET pin. Further, the detection time varies with the capacitance connected to the CTP and CTW
pins.
7