M41ST84W View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

M41ST84W

3.0/3.3 V I2C serial RTC with 44 bytes of NVRAM and supervisory functions

STMicroelectronics 

Clock operation

M41ST84W

3.14

Initial power-on defaults

Upon initial application of power to the device, the following register bits are set to a '0' state:

watchdog register, TR, FT, AFE, ABE, and SQWE. The following bits are set to a '1' state:

ST, OUT, and HT (see Table 8 on page 26).

Table 7. trec definitions

tREC bit (TR)

STOP bit (ST)

0

0

0

1

1

X

1. Default setting

trec time

Min

Max

96

98

40

200(1)

50

2000

Units

ms

ms

µs

Table 8. Default values

Condition

TR

ST

HT Out

FT

AFE

ABE

SQWE

WATCHDOG

register(1)

Initial power-up

(battery attach)(2)

0

1

1

1

0

0

0

0

0

Subsequent power-up (with battery

backup)(3)

UC

UC

1

UC

0

0

0

0

0

1. WDS, BMB0-BMB4, RB0, RB1.

2. State of other control bits undefined.

3. UC = Unchanged

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