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STM6822SWY6E bảng dữ liệu(PDF) 5 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  5-Pin Supervisor with Watchdog Timer and Push-button Reset
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STM6321/6322/6821/6822/6823/6824/6825
Pin Descriptions
Active-Low, Push-pull Reset Output (RST) -
STM6822/6823/6824/6825. Pulses low when trig-
gered, and stays low whenever VCC is below the
reset threshold or when MR is a logic low. It re-
mains low for trec after either VCC rises above the
reset threshold, the watchdog triggers a reset, or
MR goes from low to high.
Active-Low, Open Drain Reset Output (RST) -
STM6321/6322/6822. Pulses low when triggered,
and stays low whenever VCC is below the reset
threshold or when MR is a logic low. It remains low
for trec after either VCC rises above the reset
threshold, the watchdog triggers a reset, or MR
goes from low to high. Connect a pull-up resistor
to supply voltage.
Push-button Reset Input (MR). A logic low on
MR asserts the reset output. Reset remains as-
serted as long as MR is low and for trec after MR
returns high. This active-low input has an internal
52k
Ω pull-up. It can be driven from a TTL or CMOS
logic line, or shorted to ground with a switch.
Leave open if unused.
Watchdog Input (WDI). If WDI remains high or
low for at least 1.6sec, the internal watchdog timer
expires and reset is asserted. The internal watch-
dog timer clears while reset is asserted or when
WDI sees a rising or falling edge. The watchdog
function CAN be disabled if WDI is left unconnect-
ed or is connected to a tri-state buffer output.
Active-High Reset Output. Active-high,
push-
pull reset output; inverse of RST.
Table 3. Pin Functions
Figure 6. Block Diagram (STM6xxx)
Note: 1. For STM6321/6821/6822/6823/6824
2. For STM6322/6821/6822/6823/6825
3. For STM6821/ (RST output only)
4. For STM6321/6322/6824/6825 (both RST and RST outputs)
Pin
Name
Function
STM6822
STM6823
STM6821
STM6321
STM6824
STM6322
STM6825
1–
11
RST
Active-Low Reset Output
33
–4
MR
Push-button Reset Input
4
4
4
WDI
Watchdog Input
1
3
3
RST
Active-High Reset Output
55
55
VCC
Supply Voltage
22
22
VSS
Ground
AI09132
VRST
RST (RST)
(3)
WATCHDOG
TIMER
WDI
Transitional
Detector
COMPARE
trec
Generator
VCC
WDI
(1)
MR
(2)
RST
(4)
VCC


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