Description STM6510
10/26 Doc ID 16788 Rev 2
1.3.5 Reset output (RST)
RST is active-low, open-drain.
1.3.6 Adjustable reset timeout (TREC
ADJ
pin)
The reset timeout (t
REC
) is adjustable by connecting an external capacitor C
tREC
to this pin.
Calculated t
REC
and C
tREC
examples are given in Table 3. Refer also to Table 6.
Table 3. t
REC
programmed by an ideal external capacitor
Calculated C
tREC
value [µF]
t
REC
[ms]
(1)(2)
1. Example calculations based on an ideal capacitor. During application design and component selection it
should be considered that the current flowing into the external t
REC
programming capacitor (C
tREC
) is on
the order of 100 nA, therefore a low-leakage capacitor (ceramic or film capacitor) and an adequate PCB
environment should be used to prevent t
REC
accuracy from being affected. A recommended minimum
value of C
tREC
is 0.001 µF.
2. In case of repeated activations of the t
REC
counter, an interval of 10 ms min. is needed between t
REC
intervals to fully discharge C
tREC
, so that the next t
REC
is as specified.
Closest common
C
tREC
value [µF]
Min. Typ. Max.
0.001 10 15 20 0.001
0.002 20 30 40 0.0022
0.01 100 150 200 0.01
0.014 140 210 280 0.015
0.028 280 420 560 0.027
0.056 560 840 1120 0.056
0.112 1120 1680 2240 0.1
