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參數(shù)資料
| 型號(hào)： | TWL2214CA |
| 英文描述： | High voltage fast-switching NPN power transistor |
| 中文描述： | 電源管理IC和鋰離子電池充電控制 |
| 文件頁數(shù)： | 8/36頁 |
| 文件大小： | 511K |
| 代理商： | TWL2214CA |
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SLVS321A
–
OCTOBER 2001
–
REVISED JANUARY 2002
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
detailed description (continued)
Auto power up with
adapter insertion
Adapter Attachment
0.9 VOUT
VG3
VG2
VDD
PWRKIN
VREG1
PWRKOUT
CD1
XRST
PSH
CD2
CDI Delay
VCHG
Power down by
power key insertion
CPU senses this falling
edge and drives PSH to L
Figure 3. Adapter Powered (Without Battery)
reset controller
The reset controller performs two major functions: one is to control the timing of delayed power-on reset, and
the other is to monitor the V
REG1
level.
The delay reset process is started when V
REG1
reaches 90% of its nominal output voltage level. The delay time
of the reset output (XRST) can be adjusted by an external timing capacitor (CD1).
During the system active state when V
REG1
drops below 0.9
×
V
nominal
–
hysteresis, XRST is driven low. If V
REG1
reaches 90% of its nominal output voltage level again, the delayed reset process is started over.
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