BD4912 查看數據表（PDF） - ROHM Semiconductor
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BD4912 Datasheet PDF : 17 Pages
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zBlock diagram
Vcc1
6
0.47μF
Over protection
circuit
Except （VDD, SW5V）
OFF
Pre Reg
Vref
Thermal
Shutdown
Vｂｕf
SEL1
11
4 state
Over
protection
circuit
Vcc2
10
0.47μF
ALL OUTPUTS
OFF
－
VDD
9
0.1μF
Vcc1
－
Vcc1
ILM
2
0.1μF
Vcc1
P.CON
4
0.1μF
1 GND
2 ILM
3 P.ANT
4 P.CON
5 AM
6 VCC1
7 AUDIO
8 SW5V
9 VDD
10 VCC2
11 SEL1
12 SEL2
SEL2
12
GND
1
Fig.38 Pin Assignment Diagram
－
3 state
－
Fig.39 Block Diagram
Vcc1
P.ANT
3
0.1μF
AM
5
0.1μF
VDD
Vcc1
SW5V
8
0.1μF
AUDIO
7
0.1μF
zPin descriptions
1
GND
2
ILM
3
P.ANT
4
P.CON
5
AM
6
VCC1
7
AUDIO
8
SW5V
9
VDD
10
VCC2
11
SEL1
12
SEL2
This pin is connected to the IC's substrate.
This pin serves as the lighting power supply (10.3 V; Peak output current: 200 mA).
This pin outputs a voltage that is approximately 0.4 V (TYP) lower than the VCC1 pin
voltage, and the peak output current is 300 mA.
This pin outputs a voltage that is approximately 0.4 V (TYP) lower than the VCC1 pin
voltage, and the peak output current is 350 mA.
This pin serves as the AM receiver power supply (7.9 V; Peak output current: 25 mA).
This pin is connected to the car's backup and ACC power supplies.
This pin serves as the common system power supply for volume and sound control
(8.12 V, Peak output current: 200 mA), as well as the power supply for variable
capacitance diodes and other components used for electronic tuning and cassette
player features, such as the equalizer.
This pin serves as the microcontroller power supply (5.0 V; Peak output current: 30 mA).
This pin serves as the microcontroller power supply (5.0 V; Peak output current: 400 mA).
This pin serves as the VDD power supply pin.
ILM, P.CON, and P.ANT output can be switched on or off by applying a 2.25 V, 4.25 V, or
9.5 V signal to this pin.
AUDIO, SW5V, and AM output can be switched on or off by applying a 2.5 V or 4.25 V
signal to this pin.
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