參數(shù)資料
型號(hào)： MB3892
廠商： Fujitsu Limited
英文描述： Power Management IC for Mobile Phone
中文描述： 電源管理IC的移動(dòng)電話
文件頁數(shù)： 29/40頁
文件大小： 503K
代理商： MB3892
MB3892
29
2.
Speaker Amp.
(1) Receiver Amp.
This is the BTL output type Amp. driving speaker directly. When the output power is 90mW typ. (at 32
), the
serial control processes the on/off and the earphone switching control.
The optional gain can be set by the connection of feedback resistor from FB terminal (pin 20) to OUTA terminal
(pin 25) and the connection of input resistor to FB terminal.
(2) Loudspeaker Amp.
This is the BTL output type Amp. driving speaker directly. When the output power is 260mW typ. (at 8
), the
serial control processes the on/off control.
The optional gain can be set by the connection of feedback resistor from FB terminal (pin 20) to SPOUTA terminal
(pin 22) and the connection of input resistor to FB terminal.
3.
Sounder
Three low-saturation output transistors are built in for buzzer drive. When the signal from serial control is "H"
level and IN1 terminal (pin 10) voltage is "H" level, the V01 terminal (pin 16) voltage is 0.3V (typ.). When IN2
terminal (pin 11) voltage and IN3 terminal (pin 12) voltage are "H" level, the V02 terminal (pin 14) voltage and
V03 terminal (pin 13) voltage are also 0.3V (typ.).
4.
LED drive
The LEDO1 terminal (pin 2) voltage and LEDO2 terminal (pin 4) voltage is 0.2V (typ.), when the signal from
serial control is "H" level. When the signal from charge control is "H" level, the LEDR terminal (pin 1) voltage is
0.2V (typ.).
5.
Charge control
(1) Charge control
The main charge is started by the signal from serial control indicates preliminary charge is finished.
According to the voltage level at CHGV terminal (pin 49) generated by microprocessor on the microprocessor
operation, the charge current is controlled by adjusting gate voltage from outside FET.
(2) Charge current detector
The charge current detector sensitivity (gain) can be switched by the signal from serial control.
The VBH terminal (pin 46) voltage and VB4 terminal voltage (pin 58) are detected and CHGI terminal (pin 47)
voltage is generated.
(3) Preliminary charge circuit
When the battery voltage is low, the charge is controlled until the microprocessor starts the operation.
Before the battery voltage reaches 2.6V (typ.), 50mA (typ.) is used for the charge and before 4V (typ.), 100mA
(typ.) is used.
(4) External power supply detector
This function is to detect if the case is attached to the battery charger.
When the case is attached to the battery charger, EXTVCC terminal (pin 52) voltage is "H" level and generate
"L" level voltage at CHGDET terminal (pin 51). When the case is not attached to the battery charger, EXTVCC
terminal voltage is "L" level and generate "H" level voltage at CHGDET terminal.
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