Datasheet > M48T212A

M48T212A

更新时间： 2024-11-10 22:46:43

品牌	Logo	应用领域
意法半导体 - STMICROELECTRONICS		控制器
页数	文件大小	规格书
20页	166K
描述
3.3V TIMEKEEPER CONTROLLER

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M48T212A 数据手册

M48T212A

3.3V TIMEKEEPER CONTROLLER

PRELIMINARY DATA

■ CONVERTS LOW POWER SRAM into

NVRAMs

■ YEAR 2000 COMPLIANT (4-Digit Year)

■ USES SUPER CAPACITOR or LITHIUM

BATTERY (User Supplied)

■ BATTERY LOW FLAG

■ INTEGRATED REAL TIME CLOCK,

POWER-FAIL CONTROL CIRCUIT

■ AUTOMATIC POWER-FAIL CHIP DESELECT

and WRITE PROTECTION

SOH44 (MH)

■ WATCHDOG TIMER

■ WRITE PROTECT VOLTAGES

PFD

= Power-fail Deselect Voltage):

– M48T212A: 2.7V ≤ V

≤ 3.0V

PFD

Figure 1. Logic Diagram

■ MICROPROCESSOR POWER-ON RESET

■ PROGRAMMABLE ALARM OUTPUT ACTIVE

CAP

in the BATTERY BACKED-UP MODE

DESCRIPTION

The M48T212A is a self-contained device that in-

cludes a real time clock (RTC), programmable

alarms, a watchdog timer, and two external chip

enable outputs which provide control of up to four

(two in parallel) external low-power static RAMs.

A built-in 32.768 kHz oscillator (external crystal

controlled) is used for the clock/calendar function.

A0-A3

DQ0-DQ7

IRQ/FT

RST

Access to all TIMEKEEPER functions and the ex-

ternal RAM is the same as conventional byte-wide

SRAM. The 16 TIMEKEEPER Registers offer

Century, Year, Month, Date, Day, Hour, Minute,

Second, Control, Calibration, Alarm, Watchdog,

and Flags. Externally attached static RAMs are

CON

M48T212A

CON

CCSW

OUT

WDI

RSTIN1

RSTIN2

controlled by the M48T212A via the E1

and

CON

signals (see Table 4).

CON

Automatic backup and write protection for an ex-

ternal SRAM is provided through V , E1

OUT

CON

and E2

pins. (Users are urged to insure that

CON

voltage specifications, for both the controller chip

and external SRAM chosen, are similar).

BAT–

AI03047

March 2000

1/20

This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

12 3 4 5 6 7...20

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