DS28DG02E-3C+T【PDF 1/34 页】IC EEPROM 2KBIT 2MHZ 28TSSOP

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11/09

EV KIT AVAILABLE

DS28DG02

2Kb SPI EEPROM with PIO, RTC,

Reset, Battery Monitor, and Watchdog

www.maxim-ic.com

GENERAL DESCRIPTION

FEATURES

The DS28DG02 combines 2Kb (256 x 8) EEPROM

with 12 PIO lines, a real-time clock (RTC) and

calendar with alarm function, a CPU reset monitor, a

battery monitor, and a watchdog. Communication

with the device is accomplished with an industry-

standard SPI? interface. The user EEPROM is

organized as four blocks of 64 bytes each with

single-byte and up to 16-byte page write capability.

Additional registers provide access to PIOs and to

setup functions. Individual PIO lines can be

configured as inputs or outputs. The power-on state

of PIOs programmed as outputs is stored in

nonvolatile (NV) memory. All PIOs may be

reconfigured by the user through the serial interface.

The RTC/calendar operates in the 12/24-hour format

and automatically corrects for leap years. Battery

monitor threshold and watchdog timeout are user-

programmable through NV registers. The reset

monitor generates a reset to the CPU if the voltage at

the V CC pin falls below the factory-set limit. The reset

output includes a debounce circuit for manual

pushbutton reset.

APPLICATIONS

Asset-Tracking Systems

Broadband Access Network Equipment

Patient-Monitoring Systems

Home Lighting Control Systems

Holter Heart Monitors

Typical Operating Circuit appears on page 32.

Pin Configuration appears on page 33.

ORDERING INFORMATION

2Kb (256 x 8) EEPROM Organized in Four

64-Byte Blocks

Single Byte and Up to 16-Byte EEPROM Write

Sequences

EEPROM Write-Protect Control Pin Protects

1, 2, or All 4 Blocks

Endurance 200k Cycles per Page at +25°C;

10ms (max) EEPROM Write Cycle

SPI Serial Interface Supporting Modes (0,0)

and (1,1) at Up to 2MHz Clock Frequency

12 PIO Lines with LED Drive Capability

Each PIO is Configured to Input or Output,

Open-Drain/Push-Pull on Startup by Stored

Value

All PIOs are Reconfigurable After Startup

RTC/Calendar/Alarm with BCD Format and

Leap-Year Compensation

RTC Controlled Through 32.768kHz, 12.5pF

Crystal or External TCXO

CPU Reset Through Fast-Response Precision

V CC Monitor with Hysteresis or Pushbutton

Battery Monitor 2.5V, 2.25V, 2.0V, 1.75V, -5%

Watchdog Timer 1.6s, 0.8s, 0.4s, 0.2s (typ)

Unique Factory-Programmed 64-Bit Device

Registration Number

Operating Range: 2.2V to 5.25V,

-40°C to +85°C

±4kV IEC 1000-4-2 ESD Protection Level

(Except Crystal Pins)

Available in 28-Lead, 4.4mm TSSOP or

36-Lead 6mm × 6mm QFN Package

PART

DS28DG02E-3C+

DS28DG02E-3C+T

DS28DG02G-3C+

DS28DG02G-3C+T

TEMP RANGE

-40°C to +85°C

V CC TRIP

3.3V -5%

PIN-PACKAGE

28 TSSOP-EP * (4.4mm)

28 TSSOP-EP * T&R

36 TQFN-EP * (6mm × 6mm)

36 TQFN-EP * T&R

PKG CODE

U28E+5

T3666+3

*EP = Exposed Paddle.

+Denotes lead-free/RoHS compliant device.

For additional V CC monitor trip points or other device options, contact the factory.

Note: Registers are capitalized for clarity.

SPI is a trademark of Motorola, Inc.

Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device

may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata .

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