AB-RTC-TC-32.768kHz-2

Real Time Clock Module with I2C Bus

Revision: A 8/4/2025

Page 4

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Note 1: VDD needs to be supplied with more than 2.5V at least for the oscillation to stabilize (oscillation start time tSTA).

Note2：After the power supply is powered off, ensure that VDD = GND for more than 10 seconds, and then power on.

Parameters

Symbol Min. Typ. Max. Units

Notes

Startconditionsetuptime[Note1] tHD;STA 0.6

us

Startconditionholdtime[Note1] tSU;STA 0.6

us

Stop condition setup time

tSU;STO

0.6

us

Bus idle time between start

condition and stop condition

tRCV

1.3

us

Data setup time

tSU;DAT

100

ns

Data hold time

tHD;DAT

0

0.9

ns

I2C clock signal (pad 2)

SCL

SCL clock frequency

fSCL

400

kHz

SCL low voltage time

tLOW

1.3

us

SCL high voltage time

tHIGH

0.6

us

SCL rising time

tr

0.3

us

SCL falling time

tf

0.3

us

I2C data signal (pad 13)

SDA

SDA rising time

tr

0.3

us

SDA falling time

tf

0.3

us

AC Characteristics (Unless otherwise specified, VDD =2.5V ~ 5.5V; Ta=-40

℃~+85℃)