stm6504seabdg6f STMicroelectronics, stm6504seabdg6f Datasheet - Page 11

• Manufacturer Part Number: stm6504seabdg6f
• Description: Dual Push-button Smart Reset Tm With User-adjustable Setup Delays
• Manufacturer: STMicroelectronics

STM6502, STM6503, STM6504, STM6505
1.1.5
1.1.6
Edge-triggered Smart Reset™ input (SRE pin) – STM6504 only
The SRE pin is active-high, is an immediate and independent reset input, and includes an
edge trigger with debounce delay on the falling edge, t
diagram
Figure 8.
Adjustable delay of Smart Reset™ input (SRC pin) – STM6502 and
STM6505 only
This pin controls the setup time before the push-button action is validated by the reset
output. It is connected to an external capacitor (C
desired value of the setup time (t
Calculated t
Table 3.
1. At 25 °C. Example calculations based on an ideal capacitor. It should be considered during application
2. In case of repeated activations of the t
Calculated C
design and component selection that the current flowing into the external t
(C
adequate PCB environment should be used to prevent t
recommended minimum value of C
activations to fully discharge C
Independent
SRE
value [µF]
RST
SR0
SRC
0.2
0.3
0.6
) is in the order of 100 nA, therefore a low-leakage capacitor (ceramic or film capacitor) and an
Figure
1
No debounce
SRC
STM6504 timing
t
SRC
SRC
t < t DEBOUNCE
=> counter reset
8.
and C
RST low for > 240 ms
programmed by an ideal external capacitor – STM6502 and STM6505
In this case, actual
SRC
Min.
10
examples are given in
2
3
6
SRC
t REC
Doc ID 16101 Rev 4
, so that the next t
SRC
SRC
SRC
Setup delay t
is 0.01 µF.
).
counter, an interval of 10 ms min. is needed between the
t < t SRC
t DEBOUNCE
Typ.
3.75
12.5
2.5
7.5
SRC
SRC
SRC
is as specified.
SRC
Table
[s]
accuracy from being affected. A
), which is tied to ground to provide the
(1)(2)
t REC
DEBOUNCE
3. Refer also to
Max.
SRC
3.0
4.5
15
9
t SRC
= 240 ms min. See timing
programming capacitor
Table
t REC
Closest common
C
SRC
6.
Description
value [µF]
0.22
0.33
0.56
1
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