MAX6902 查看數據表（PDF） - Maxim Integrated

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MAX6902

SPI-Compatible RTC in a TDFN

Maxim Integrated 

19-2134; Rev 3; 1/08

SPI-Compatible RTC in a TDFN

General Description

The MAX6902 SPI™-compatible real-time clock con-

tains a real-time clock/calendar and 31 x 8 bits of static

random-access memory (SRAM). The real-time

clock/calendar provides seconds, minutes, hours, day,

date, month, year, and century information. A time/date

programmable polled ALARM is included in the

MAX6902. The end-of-the-month date is automatically

adjusted for months with fewer than 31 days, including

corrections for leap year up to the year 2100. The clock

operates in either the 24hr or 12hr format with an

AM/PM indicator. The MAX6902 operates with a supply

voltage of +2V to +5.5V, is available in the ultra-small

8-pin TDFN package, and works over the -40°C to

+85°C industrial temperature range.

Point-of-Sale Equipment

Intelligent Instruments

Fax Machines

Battery-Powered Products

Portable Instruments

Applications

Features

♦ Real-Time Clock Counts Seconds, Minutes, Hours,

Day of Week, Date of Month, Month, Year, and Century

♦ Leap-Year Compensation Valid up to Year 2100

♦ +2V to +5.5V Wide Operating Voltage Range

♦ SPI Interface: 4MHz at 5V; 1MHz at 2V

♦ 31 x 8-Bit SRAM for Scratchpad Data Storage

♦ Uses Standard 32.768kHz, 12.5pF Watch Crystal

♦ Low Timekeeping Current (400nA at 2V)

♦ Single-Byte or Multiple-Byte (Burst Mode) Data

Transfer for Read or Write of Clock Registers or

SRAM

♦ Ultra-Small 8-Pin 3mm x 3mm x 0.8mm TDFN

Package

♦ Programmable Time/Date Polled ALARM Function

♦ No External Crystal Bias Resistors or Capacitors

Required

Ordering Information

PART

TEMP RANGE

MAX6902ETA+T -40°C to +85°C

+Denotes lead-free package.

PIN-

PACKAGE

8 TDFN

TOP

MARK

+AGT

PART

MAX6900

MAX6901

MAX6902

SERIAL

INTERFACE

I2C compatible

3 Wire

SPI compatible

SRAM

31 ✕ 8

31 ✕ 8

31 ✕ 8

Related Real-Time Clock Products

ALARM

FUNCTION

—

Polled

Polled

OUTPUT

FREQUENCY

—

32kHz

—

PIN-

PACKAGE

6 TDFN

8 TDFN

8 TDFN

Typical Operating Circuit

+3.3V

μc

+3.3V 0.1μF

6

VCC

X1 8

MAX6902

1 SCLK

5 CS

X2 7

2 DOUT

3 DIN

GND

4

32.768kHz

CRYSTAL

TOP VIEW

Pin Configuration

+

SCLK 1

8 X1

DOUT 2

DIN 3

MAX6902

7 X2

6 VCC

GND 4

5 CS

EXPOSED PADDLE

TDFN

SPI is a trademark of Motorola, Inc.

________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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