參數(shù)資料
型號: AN32502A
英文描述: For Information·Communication - PDA
中文描述: 信息·通訊-掌上電腦
文件頁數(shù): 20/45頁
文件大?。?/td> 574K
代理商: AN32502A
20
SDF00034AEB
AN32502A
Publication data: November 2002
F
B
VBO
VBI
BO
50
51
52
48
47
SW1
27
24
RGC2
LC2
Ch.2 output
VB
49
VB
Technical Data (continued)
4. Backup circuit operation
Backup
battery
in case VB < 3.1 V
Coin battery
detection
Regulator
for
coin battery
Boost
DC-DC
control
in case VB > 3.1 V
Powered from coin battery
1) Coin battery detection circuit monitors pin 49 voltage.
When it becomes equal to or less than 2.2 V, it make switch 1 and boost DC-DC converter off.
(To prevent over-discharge of the backup battery.)
2) Output voltage of regulator can set freely between 2.7 V and 3.3 V when set VB: 3.6 V
through adjustment of
feedback voltage of pin 47.
3) Boost DC-DC converter output is set 3.2 V internally.
4) Switching to ch.2 is exercised by the intra-judging circuit.
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