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STM6719 bảng dữ liệu(HTML) 8 Page - STMicroelectronics

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Description
STM6717/6718/6719/6720/STM6777/6778/6779/6780
8/30
Doc ID 11469 Rev 8
VCC1. It can be driven from a TTL or CMOS logic line, or with open drain/collector outputs,
or connected to VSS through a switch. If unused, leave this pin open or connect it to VCC1.
Connect a normally open momentary switch from MR to VSS; external debounce circuitry is
not required. (If MR is driven from long cables or if the device is used in noisy environments,
connecting a 0.1µF capacitor from MR to VSS provides additional noise immunity.
1.1.4
Manual reset delay input (MRC) - STM6777/78/79/80)
This pin is either left open or connected to VSS via a capacitor. By selecting the appropriate
capacitor, the manual reset process, initiated by pressing the push-button manual reset
input, can be delayed by any value from 6 µs or more (see Table 7 on page 21).
1.1.5
Primary supply voltage monitoring input (VCC1)
It also is the input for the primary reset threshold monitor. Available fixed (customer-
selectable, factory-programmed) reset thresholds include 4.63 V to 1.58 V.
1.1.6
Secondary supply voltage monitoring input (VCC2)
This function is available on the STM6717/18/19/20/77/78. Fixed (customer-selectable,
factory-programmed) reset thresholds include 3.08 V to 0.79 V.
1.1.7
Adjustable reset comparator input (RSTIN; STM6719/20/79/80)
This is a high impedance input. RST is driven low when the voltage at the RSTIN pin falls
below 0.626 V (internal reference voltage at this comparator). The monitored voltage reset
threshold is set with an external resistor-divider network.
Table 3.
Pin functions
Pin
Name
Function
STM6717
STM6718
STM6719
STM6720
STM6777
STM6778
STM6779
STM6780
1111
RST
Active-low reset output
3333
MR
Push-button reset input
5
4
MRC
Manual reset delay input
5666
VCC1 Primary supply voltage input
444
VCC2 Secondary supply voltage input
5
5
RSTIN Adjustable reset comparator input
2222
VSS
Ground


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