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MIC826 数据表(PDF) 10 Page - Microchip Technology

部件名 MIC826
功能描述  Voltage Supervisor with Watchdog Timer, Manual Reset, and Dual Outputs
PDF  22 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

MIC826 数据表(HTML) 10 Page - Microchip Technology

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MIC826
DS20006668A-page 10
2022 Microchip Technology Inc. and its subsidiaries
/MR, or if VCC falls below VRST. The watchdog timer
starts again whenever the reset outputs are
de-asserted.
FIGURE 4-3:
Watchdog Timing.
4.5
Watchdog Input Current
The WDI input current is the current sourced or sinked
by the WDI pin when the WDI input is driven low or
high, respectively. The WDI input is designed to drive a
tri-state output device with a 10 µA maximum leakage
current and a maximum capacitance of 200 pF.
4.6
VCC Transient
The MIC826 is relatively immune to small
negative-going VCC glitches below the reset threshold.
As shown in Figure 4-4, the overdrive voltage is the
difference between the threshold voltage and the
minimum point of the VCC glitch. Typically, an overdrive
of 100 mV with duration of 2 μs or less will not cause a
reset.
FIGURE 4-4:
VCC Transient.
4.7
Reset Valid Up to VCC = 1V
The MIC826 is a supervisory circuit that monitors the
power supply voltage level. If the power supply voltage
level falls below the factory-programmed threshold
level, then the reset signals are asserted. The MIC826
maintains the reset states with VCC as low as 1V.
4.8
Supply Bypass Capacitor
An optional 0.1 µF input bypass capacitor can be
placed from VCC (Pin 6) to GND (Pin 2) to increase
glitch rejection.
5.0
TYPICAL APPLICATIONS
FIGURE 5-1:
MIC826 for Precision Power
Good Function.
FIGURE 5-2:
MIC826 Used for Load
Switch.
FIGURE 5-3:
MIC826 Used for
Microcontroller Reset with Watchdog Input.
V
RST
t
WD
t
RP
t
RP
/RESET*
WDI
*RESET ON THE MIC826 IS THE INVERSE OF /RESET
VCC
VRST + VHYST
/RESET
0V
VOL
tRP
OVERDRIVE
GLITCH DURATION
/RESET
MIC826
GND
WDI
/MR
VCC
RESET
VCC
U1
5
4
2
3
1
6
SW1
/MR
MIC5365
GND
EN
VIN
OUT
/RESET
MIC826
GND
WDI
/MR
VCC
RESET
VCC
U1
5
4
2
3
1
6
SW1
/MR
MIC94044
GND
EN
VIN
OUT
/RESET
MIC826
GND
WDI
/MR
VCC
RESET
VCC
U1
54
2
3
1
6
SW1
/MR
μP
GND
RESET
VIN
I/O



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