DS1372 datasheet(4/12 Pages) MAXIM

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Pin Description

NAME

FUNCTION

1, 2

X1, X2

Connections for Standard 32.768kHz Quartz Crystal. The internal oscillator circuitry is designed for

operation with a crystal having a 12.5pF specified load capacitance (CL). Pin X1 is the input to the

oscillator and can optionally be connected to an external 32.768kHz oscillator. The output of the

internal oscillator, pin X2, is floated if an external oscillator is connected to pin X1.

AD0

Slave Address Input. This pin is the slave address input for the I2C serial interface and is used to

access multiple devices on the same bus. To select the device, the address value on the pin

must match the corresponding bit in the device addresses. This pin can be connected to VCC or

ground or be driven to a logic-high or logic-low level.

GND

Ground

SDA

Serial Data Input/Output. This pin is the data input/output for the I2C serial interface. The SDA pin is

open drain and requires an external pullup resistor.

SCL

Serial Clock Input. This pin is the clock input for the I2C serial interface and is used to synchronize

data movement on the serial interface.

SQW/

INT

Square Wave or Active-Low Interrupt Open-Drain Output. This pin is used to output the square wave

or alarm interrupt signal. The function of this pin is selected by the state of the INTCN control bit.

This pin is open drain and requires an external pullup resistor.

VCC

DC Power Pin. This pin should be decoupled using a 0.1μF or 1.0μF capacitor.

DS1372

OSCILLATOR

POWER

÷4096

1Hz

CLR

4096Hz

8192Hz

32,768Hz

DIVIDER CHAIN

RS[2:1]

SQW/INT

VCC

GND

SDA

SCL

AD0

I2C

INTERFACE

CONTROL/

STATUS

32-BIT

COUNTER

24-BIT ALARM

COUNTER

64-BIT ID

ROM

÷2

÷4

MUX

INTCN

SQW

ACE

MUX

Figure 1. Block Diagram

I2C, 32-Bit, Binary Counter Clock with 64-Bit ID

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