STM6321YWY6F(2008) Просмотр технического описания (PDF) - STMicroelectronics
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STM6321YWY6F Datasheet PDF : 28 Pages
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STM6321/6322STM6821/6822/6823/6824/6825
Description
1.1
1.1.1
1.1.2
1.1.3
1.1.4
1.1.5
Pin descriptions
Active-low, push-pull reset output (RST) - STM6822/6823/6824/6825
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.
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 asserted as long as MR is low
and for trec after MR returns high. This active-low input has an internal 52 kΩ 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 1.6s, the internal watchdog timer expires and reset is
asserted. The internal watchdog 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 unconnected or
is connected to a tri-state buffer output.
Active-high reset output (RST)
Active-high, push-pull reset output; inverse of RST.
Table 3.
Pin functions
Pin
STM6822
STM6823
1
3
4
—
5
2
STM6821
—
3
4
1
5
2
STM6321
STM6824
1
—
4
3
5
2
STM6322
STM6825
1
4
—
3
5
2
Name
Function
RST
MR
WDI
RST
VCC
VSS
Active-low reset output
Push-button reset input
Watchdog Input
Active-high reset output
Supply voltage
Ground
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