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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.

Applications

Point-of-Sale Equipment

Intelligent Instruments

Fax Machines

Battery-Powered Products

Portable Instruments

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

MAX6902

SPI-Compatible RTC in a TDFN

________________________________________________________________ Maxim Integrated Products 1

Pin Configuration

Ordering Information

Typical Operating Circuit

19-2134; Rev 1; 7/03

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.

PART

TEMP

RANGE

PIN-

PACKAGE

TOP

MARK

MAX6902ETA-T -40°C to +85°C 8 TDFN AGT

CSGND

X2DOUT

DIN

SCLK

TDFN

TOP VIEW

MAX6902

+3.3V

GND

0.1µF

µc

SCLK

32.768kHz

CRYSTAL

DOUT

DIN

C is a trademark of Philips Corp. Purchase of I

C components of Maxim Integrated Products, Inc., or one of its sublicensed

Associated Companies, conveys a license under the Philips I

C Patent rights to use these components in an I

C system provided that

the system conforms to the I

C Standard Specification as defined by Philips.

SPI is a trademark of Motorola, Inc.

PART

SERIAL

INTERFACE

SRAM

ALARM

FUNCTION

OUTPUT

FREQUENCY

PIN-

PACKAGE

MAX6900 I

C™ compatible 31

8 ——6 TDFN

MAX6901 3 Wire 31

8 Polled 32kHz 8 TDFN

MAX6902 SPI compatible 31

8 Polled — 8 TDFN

Related Real-Time Clock Products

1 2 3 4 5 6 ... 17 18

Sommario

Pagina 1 - SPI-Compatible RTC in a TDFN

General DescriptionThe MAX6902 SPI™-compatible real-time clock con-tains a real-time clock/calendar and 31 x 8 bits of staticrandom-access memory (SRA

Pagina 2

MAX6902SPI-Compatible RTC in a TDFN 10 ______________________________________________________________________________________unusable, and always read

Pagina 3

MAX6902SPI-Compatible RTC in a TDFN______________________________________________________________________________________ 11Using the On-Board RAMThe

Pagina 4

MAX6902SPI-Compatible RTC in a TDFN 12 ______________________________________________________________________________________1 1 1 1 1 1 D7 D6 D5 D4 D

Pagina 5

MAX6902SPI-Compatible RTC in a TDFN______________________________________________________________________________________ 13Chip SelectCS serves two f

Pagina 6

MAX6902SPI-Compatible RTC in a TDFN 14 ______________________________________________________________________________________k = parabolic curvature c

Pagina 7

Timekeeping CurrentWhen DOUT is high impedance (CS = high or during aDIN transfer segment), there is a potential for increasedtimekeeping current (up

Pagina 8

MAX6902SPI-Compatible RTC in a TDFN 16 ______________________________________________________________________________________GROUND PLANEVIA CONNECTIO

Pagina 9

MAX6902SPI-Compatible RTC in a TDFN______________________________________________________________________________________ 17Functional DiagramSECONDSM

Pagina 10

MAX6902SPI-Compatible RTC in a TDFNMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim produ

Pagina 11

MAX6902SPI-Compatible RTC in a TDFN 2 _______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSD

Pagina 12

MAX6902SPI-Compatible RTC in a TDFN_______________________________________________________________________________________ 3AC ELECTRICAL CHARACTERIST

Pagina 13

MAX6902Detailed DescriptionThe MAX6902 is a real-time clock/calendar with an SPI-compatible interface and 31 x 8 bits of SRAM. It pro-vides seconds, m

Pagina 14

MAX6902SPI-Compatible RTC in a TDFN_______________________________________________________________________________________ 5Figure 2. Register Address

Pagina 15

MAX6902SPI-Compatible RTC in a TDFN 6 _______________________________________________________________________________________REGISTER ADDRESS REGISTER

Pagina 16

MAX6902SPI-Compatible RTC in a TDFN_______________________________________________________________________________________ 7REGISTER ADDRESS REGISTER

Pagina 17

MAX6902SPI-Compatible RTC in a TDFN 8 _______________________________________________________________________________________Table 2. Register Address

Pagina 18 - Package Information

MAX6902SPI-Compatible RTC in a TDFN_______________________________________________________________________________________ 9Command and ControlAddress

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