STM6522 datasheet(10/25 Pages) STMICROELECTRONICS

10 / 25 page

Pin descriptions

STM6522

10/25

Doc ID 17045 Rev 2

2.5

Adjustable delay of Smart Reset™ (SRC pin)

This pin controls the setup time before the push-button action is validated by the reset

output. It is connected to an external capacitor (CSRC), which is tied to ground to provide the

desired value of setup time (tSRC).

Selected calculated tSRC and CSRC examples are given in Table 2. Refer also to Table 5.

2.6

Reset output (RST1)

This output is active-low, open-drain with no internal pull-up resistor.

2.7

Reset output (RST2)

This output is active-low, open-drain with no internal pull-up resistor.

Table 2.

tSRC programmed by an ideal external capacitor

Calculated CSRC

value [µF]

Setup delay tSRC [s]

(1)(2)

At 25 ° C. Example calculations based on an ideal capacitor. During application design and component

selection it should be considered that the current flowing into the external tSRC programming capacitor

(CSRC) is on the order of 100 nA, therefore a low-leakage capacitor (ceramic or film capacitor) should be

used and placed as close as possible to the SRC pin. Also an adequate low-leakage PCB environment

should be ensured to prevent tSRC accuracy from being affected. A recommended minimum value of CSRC

is 0.1 µF.

In case of quickly repeated activations of tSRC counter, an interval of 10 ms min. is needed between the

activations to fully discharge CSRC, so that the next tSRC is as specified.

Closest common

CSRC value [µF]

Min.

Typ.

Max.

0.2

2.5

3.0

0.22

0.3

3.75

4.5

0.33

0.6

7.5

0.56

12.5

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