PT7C43390 Datasheet, PDF(1/38 Page) Pericom Semiconductor Corporation

PT7C43390/43390C

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Real-time Clock Module

Features

ï Low current consumption: 0.3ÂµA typ. (VDD=3.0V,

TA = 25Â°C)

ï Wide operating voltage range: 1.35 to 5.5 V

ï Minimum time keeping operation voltage: 1.25 V

ï Built-in clock adjustment function

ï Built-in free user register

ï 2-wire (I2C-bus) CPU interface

ï Built-in alarm interrupter

ï Built-in flag generator at power down or power on

ï Auto calendar up to the year 2099, automatic leap

year calculation function

ï Built-in constant voltage circuit

ï Built-in 32 kHz crystal oscillator circuit

ï Built-in 32 kHz crystal for PT7C43390C

ï Package: SOIC-8L, TSSOP-8L, and TDFN2x3-8L

for PT7C43390; TDFN4x4-8L for PT7C43390C

Applications

ï Mobile game device, mobile phone

ï Industrial control

ï Electronic power meter

ï DVD recorder

ï Car navigation

ï IP Camera, DVR, NVR

Description

The PT7C43390 is a CMOS I2C-bus real-time clock IC,

which operates with the very low current consumption

and in the wide range of operation voltage. The

operation voltage is 1.35 V to 5.5 V so that the RTC can

be used for various power supplies from main supply to

backup battery. In the system which operates with a

backup battery, the included free registers can be used as

the function for userâs backup memory. Users always

can take back the information in the registers which is

stored before power-off the main power supply, after the

voltage is restored.

The IC has the function to correct advance / delay of the

clock data speed, in the wide range, which is caused by

the oscillation circuitâs frequency deviation. Correcting

according to the temperature change by combining this

function and a temperature sensor, it is possible to make

a high precise clock function which is not affected by

the ambient temperature.

Function Table

Item

1 Oscillator

2 Time

3 Interrupt

Function

Source

Crystal*

Time display

12-hour

24-hour

Alarm interrupt pin output

Timer interrupt output

4 Programmable square wave output (Hz)

5 Communication

2-wire I2C bus

Burst mode

IC test mode

6 Control

Power-on detector

Power supply voltage detector

7 Clock calibration

80 Free register access

2015-12-0001

PT7C43390

External crystal

ï2

1Hz,2Hz,4Hz

8Hz,16Hz

32kHz

PT7C43390C

Integral crystal

ï2

1Hz,2Hz,4Hz

8Hz,16Hz

32kHz

PT0280-8 12/11/15

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