DS1388 Просмотр технического описания (PDF) - Maxim Integrated

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DS1388

I2C RTC/Supervisor with Trickle Charger and 512 Bytes EEPROM

Maxim Integrated 

Rev 1; 9/08

I2C RTC/Supervisor with Trickle Charger

and 512 Bytes EEPROM

General Description

The DS1388 I2C real-time clock (RTC), supervisor, and

EEPROM is a multifunction device that provides a

clock/calendar, programmable watchdog timer, power-

supply monitor with reset, and 512 bytes of EEPROM.

The clock provides hundredths of seconds, seconds,

minutes, and hours, and operates in 24-hour or 12-hour

format with an AM/PM indicator. The calendar provides

day, date, month, and year information. The date at the

end of the month is automatically adjusted for months

with fewer than 31 days, including corrections for leap

year. A watchdog timer provides a reset for an unre-

sponsive microprocessor. It is programmable in 10ms

intervals from 0.01 to 99.99 seconds. A temperature-

compensated voltage reference and comparator circuit

monitors the status of VCC. If a primary power failure is

detected, the device automatically switches to the

backup supply and drives the reset output to the active

state. The backup supply maintains time and date

operation in the absence of VCC. When VCC returns to

nominal levels, the reset is held low for a period to allow

the power supply and processor to stabilize. The

device also has a pushbutton reset controller, which

debounces a reset input signal. The device is

accessed through an I2C serial interface.

Applications

Portable Instruments

Point-of-Sale Equipment

Network Interface Cards

Wireless Equipment

Pin Configuration

Features

♦ Fast (400kHz) I2C Interface

♦ RTC Counts Hundredths of Seconds, Seconds,

Minutes, Hours, Day, Date, Month, and Year with

Leap Year Compensation Valid Up to 2100

♦ Programmable Watchdog Timer

♦ Automatic Power-Fail Detect and Switch Circuitry

♦ Reset Output with Pushbutton Reset Input

Capability

♦ 512 x 8 Bits of EEPROM

♦ Integrated Trickle-Charge Capability for Backup

Supply

♦ Three Operating Voltages: 5.0V, 3.3V, and 3.0V

♦ Low Timekeeping Voltage Down to 1.3V

♦ -40°C to +85°C Temperature Range

♦ UL Recognized

Ordering Information

PART

TEMP RANGE PIN-PACKAGE

TOP

MARK

DS1388Z-5+ -40°C to +85°C 8 SO (150 mils) DS1388-5

DS1388Z-33+ -40°C to +85°C 8 SO (150 mils) DS138833

DS1388Z-3+ -40°C to +85°C 8 SO (150 mils) DS1388-3

+Denotes a lead-free/RoHS-compliant package.

Typical Operating Circuit

TOP VIEW

X1 1 +

X2 2

VBACKUP 3

DS1388

GND 4

SO

8 VCC

7 RST

6 SCL

5 SDA

VCC

VCC

CRYSTAL

VCC

RPU RPU

CPU

X1 X2 VCC

SCL DS1388

SDA

RST

VBACKUP

GND

RPU = tR/CB

______________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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