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參數(shù)資料
| 型號(hào)： | TWL2214CAPFB |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQFP48 |
| 封裝： | PLASTIC, TQFP-48 |
| 文件頁數(shù)： | 35/39頁 |
| 文件大?。?/td> | 583K |
| 代理商： | TWL2214CAPFB |
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TWL2214CA
POWER SUPPLY MANAGEMENT IC AND
LiIon BATTERY CHARGE CONTROL
SLVS321A – OCTOBER 2001 – REVISED JANUARY 2002
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Terminal Functions (Continued)
TERMINAL
I/O
DESCRIPTION
NAME
GQE NO.
PFB NO.
I/O
DESCRIPTION
VG3
G9
27
O
Gate control of an external P-FET for charging action
VIOUT
B4
44
I/O
Vibrator output
VREG1
E2
6
O
Regulator 1 output
VREG2
H2
13
O
Regulator 2 output
VREG3
J3
15
O
Regulator 3 output
VREG4
H5
18
O
Regulator 4 output
VREG5
J6
20
O
Regulator 5 output
VREG6
F2
10
O
Regulator 6 output
XRST
E1
7
O
Reset output
detailed description
power-on/-off control
The timing of the delayed power-on reset is controlled by the power-on/-off control circuit. There are two different
conditions to power-on the device: manual power on and automatic power on.
manual power on
During the power-off state, after the power key is pressed, the PWRKIN signal becomes high and the output
of VREG1 (regulator 1 output) is enabled. When the VREG1 output reaches 90% of its nominal output voltage,
the TWL2214CA device starts the delayed reset process by charging the reset timing capacitor (CD1). When
the voltage of CD1 reaches 1.2 V, the XRST signal is released by the TWL2214CA device and pulled high by
an external pull-up resistor. The reset process is completed, and the external controller operates in normal
condition. While PWRKIN remains high, the power-on condition remains active. Before PWRKIN goes low, the
external controller must drive PSH high to retain power; otherwise, the TWL2214CA device starts the delay
power-off process by charging timing capacitor CD2. After the voltage of CD2 reaches 1.2 V and no valid PSH
signal is received, the device is powered off.
automatic power on
During the power-off state, after the adapter is attached, the output of VREG1 is automatically enabled. When
VREG1 reaches 90% of its nominal output voltage, the TWL2214CA device starts the delayed reset process by
charging the reset timing capacitor (CD1). When the voltage of the CD1 reaches 1.2 V, the XRST signal is
released by the TWL2214CA device and pulled high by an external pull-up resistor. The reset process is
completed and the external controller operates in normal condition. The external controller must drive PSH to
high in time to retain power; otherwise, the TWL2214CA device starts the delay power-off process by charging
timing capacitor CD2. After voltage of CD2 reaches 1.2 V and if no valid PSH signal is received, the device is
powered off.
During the on state, the device generates an output signal PWRKOUT with an inverted polarity to PWRKIN. An
external controller can use PWRKOUT to sense whether the power key has been pressed.
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