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參數(shù)資料
| 型號(hào)： | MB3829 |
| 廠商： | Fujitsu Limited |
| 英文描述： | System Power Supply IC for Mobile Telephone |
| 中文描述： | 系統(tǒng)電源集成電路移動(dòng)電話 |
| 文件頁數(shù)： | 18/24頁 |
| 文件大?。?/td> | 442K |
| 代理商： | MB3829 |
MB3829
18
DESCRIPTION OF OPERATION
(The numbers in the timing diagram correlate to the numbers (1) to (13) below.)
(1) When the REG1 output voltage (OUT1) is about 0.8 V (V
CCL
), the reset signal is output.
(2) When OUT1 reaches a level higher than the detection voltage (V
SH
), the power-on reset/hold time setup ca-
pacitor (C
TP
) begins to charge. The V
SH
value is 2.81 V.
(3) When the power-on reset/hold time setup pin (C
TP
) voltage rises above the threshold level (Vth), the reset
clears (RESET pin voltage changes from L level to H level). The Vth value is about 1.9 V.
The power-on reset/hold time (t
PR
) is expressed by the following equation.
Also, the watchdog timer monitoring time setup capacitor (C
TW
) begins to charge.
t
PR
[ms]
≈
A x C
TP
[
μ
F]
A
≈
700
(4) When the watchdog timer monitoring time setup pin (C
TW
) voltage reaches the Hi level (V
H
), the C
TW
changes
from the charged state to the discharged state. The V
H
value is about the reference voltage of 1.24 V.
(5) When a clock pulse input is applied to the clock pin (CK) and then the next clock pulse input is applied (positive
edge trigger) to the CK pin during a C
TW
discharge, switching from the discharged state to the charged state
occurs.
(6) If a clock pulse input is not delivered to the clock pin (CK) within the watchdog timer monitoring time (tWD), the
CTW pin voltage falls below the Lo level (V
L
) so the reset signal is output (RESET pin voltage changes from H
level to the L level).
The V
L
value is about 0.24 V.
The watchdog timer monitoring time (t
WD
) is expressed by the following equation.
t
WD
[ms]
≈
B x C
TW
[
μ
F]
B
≈
1600
(7)WhentheC
TP
isrechargedtoraisetheC
TP
pinvoltageaboveVth,theresetclears,allowingthewatchdogtimer
to start running.
The watchdog timer monitoring reset time (t
WR
) is expressed by the following equation.
t
WR
[ms]
≈
D x C
TP
[
μ
F]
B
≈
50
(8) When the OUT1 drops below the fall period detection voltage (V
SL
), the C
TP
pin voltage falls so that the reset
signal is output (RESET pin voltage changes from H level to the L level).
The V
SL
value is about 2.75 V.
(9) When the OUT1 rises above V
SH
, C
TP
charging starts.
(10) When the C
TP
pin voltage rises above Vth, the reset clears, causing the watchdog timer to start running.
(11) When the inhibit signal is input (Hi level), the watchdog timer operation is forcibly stopped.
In this case, only the watchdog timer stops and the OUT1 monitoring operations ((8) to (10)) are performed. If
the inhibit input does not clear, the watchdog timer does not operate.
(12) When the inhibit input clears (becomes Lo level), the watchdog timer begins to operate.
(13) When the REG1 output turns OFF and OUT1 falls below V
SL
, the reset signal is output.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MB3829PFV-G-BND | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:System Power Supply IC for Mobile Telephone |
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