STM6510 datasheet(10/26 Pages) STMICROELECTRONICS

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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 (TRECADJ pin)

The reset timeout (tREC) is adjustable by connecting an external capacitor CtREC to this pin.

Calculated tREC and CtREC examples are given in Table 3. Refer also to Table 6.

Table 3.

tREC programmed by an ideal external capacitor

Calculated CtREC

value [µF]

tREC [ms]

(1)(2)

Example calculations based on an ideal capacitor. During application design and component selection it

should be considered that the current flowing into the external tREC programming capacitor (CtREC) 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 tREC accuracy from being affected. A recommended minimum

value of CtREC is 0.001 µF.

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

intervals to fully discharge CtREC, so that the next tREC is as specified.

Closest common

CtREC value [µF]

Min.

Typ.

Max.

0.001

0.002

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

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