M41T62LC6F(2019) データシートの表示（PDF） - STMicroelectronics

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M41T62LC6F
(Rev.:2019)

Low-power serial real-time clocks (RTCs) with alarm

STMicroelectronics 

M41T62, M41T64, M41T65

Description

Figure 10. Hardware hookup for SuperCap™ backup operation

POWER SUPPLY

+

–

Ro

VCC

D1

LEAKAGE

PATH

M41T6x

VCC

XI

IRQ/FT/OUT(2)

WDO(3)

XO

SQW(4)

SCL

SDA

VSS

F32K

(1)

D2

MCU

VCC

Port

Reset Input

SQWIN

Serial Clock Line

Serial Data Line

32KHz CLKIN

Note:

1. Diode D2 is required on open drain pin (M41T65 only) when SuperCap (or battery) backup is being used.

Low threshold BAT42 Schottky diode is recommended (see note below). D1 and D2 should be of the same

type.

2. For M41T62 and M41T65 (open drain).

3. For M41T65 (open drain).

4. For M41T64 (open drain).

Some power supplies, when shut off, can present a leakage path to ground, which shortens the backup time

provided by the SuperCap (or battery). In such cases, a very low leakage diode is recommended for D1 (and

D2).

DS3840 - Rev 24

page 6/42

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