參數(shù)資料
型號(hào)： MB3793-27APF
廠商： FUJITSU LTD
元件分類(lèi)： 電源管理
英文描述： Power Voltage Monitoring IC with Watchdog Timer
中文描述： 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8
封裝： PLASTIC, SO-8
文件頁(yè)數(shù)： 11/23頁(yè)
文件大?。?/td> 173K
代理商： MB3793-27APF
11
MB3793
-27A
5.
Clock pulse input supplementation (Positive clock pulse)
I
OPERATION SEQUENCE
1.
Positive clock pulse input
See “1. Basic operation (positive clock pulse)” under “
I
DIAGRAM.”
2.
Negative clock pulse input
See “2. Basic operation (negative clock pulse)” under “
I
DIAGRAM.”
The MB3793 operates in the same way whether it inputs positive or negative pulses.
3.
Clock monitoring
To use the MB3793 while monitoring only one clock, connect clock pins CK1 and CK2.
Although the MB3793 operates basically in the same way as when monitoring two clocks, it monitors the clock
signal at every other input pulse.
See “3. Single-clock input monitoring (positive clock pulse)” under “
I
DIAGRAM.”
4.
Description of Operations
The numbers given to the following items correspond to numbers (1) to (13) used in “
I
DIAGRAM.”
(1) The MB3793 outputs a reset signal when the supply voltage (V
CC
) reaches about 0.8 V (V
CCL
)
(2) If V
CC
reaches or exceeds the rise-time detected voltage V
SH
, the MB3793 starts charging the power-on
reset hold time setting capacitor C
TP
. At this time, the output remains in a reset state. The V
SH
value is about
2.76 V.
(3) When C
TP
has been charged for a certain period of time T
PR
(until the CTP pin voltage exceeds the threshold
voltage (V
th
) after the start of charging), the MB3793 cancels the reset (setting the RESET pin to “H” level
from “L” level).
CTW
CK1
*1
*2
CK2
V
H
V
L
Note:
The MB3793 watchdog timer monitors Clock1 (CK1) and Clock2 (CK2) pulses alternately.
When a CK2 pulse is detected after detecting a CK1 pulse, the monitoring time setting capacity (C
TW
) switches to
charging from discharging.
When two consecutive pulses occur on one side of this alternation before switching, the second pulse is ignored.
In the above figure, pulse *1 and *2 are ignored.
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