Datasheet > BQ32002

BQ32002

更新时间： 2024-10-29 11:12:47

品牌	Logo	应用领域
德州仪器 - TI		时钟
页数	文件大小	规格书
31页	1882K
描述
可自动切换到备用电源的实时时钟 (RTC)

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BQ32002

SLUSA96B –AUGUST 2010–REVISED APRIL 2016

BQ32002 Real-Time Clock (RTC)

1 Features

3 Description

The BQ32002 device is a compatible replacement for

industry standard real-time clocks.

•

Automatic Switchover to Backup Supply

I²C Interface Supports Serial Clock

up to 400 kHz

The BQ32002 features an automatic backup supply

that can be implemented using a capacitor or non-

rechargeable battery. The BQ32002 has

•

Uses 32.768-kHz Crystal With

–63-ppm to +126-ppm Adjustment

programmable calibration adjustment from –63 ppm

to +126 ppm. The BQ32002 registers include an OF

(oscillator fail) flag indicating the status of the RTC

oscillator, as well as a STOP bit that allows the host

processor to disable the oscillator. The time registers

are normally updated once per second, and all the

registers are updated at the same time to prevent a

timekeeping glitch. The BQ32002 includes automatic

leap-year compensation.

•

Integrated Oscillator-Fail Detection

8-Pin SOIC Package

–40°C to +85°C Ambient Operating Temperature

2 Applications

General Consumer Electronics

Device Information⁽¹⁾

PART NUMBER

PACKAGE

BODY SIZE (NOM)

BQ32002

SOIC (8)

4.90 mm × 3.91 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Application Circuit

V_CC

Simplified Schematic

3.0 to 3.6 V

Place supply-decoupling

1 µF

capacitor near supply pin

BQ32002

SCL

V_CC

VBACK

Automatic

Backup

Switch

Real-Time

SDA

Clock

4.7 kW

4.7 kW 4.7 kW

VCORE

____

IRQ

Interrupt

Generator

OSCI

32-kHz

Oscillator

SCL

SDA

I2C Register

OSCO

Interface With

Undervoltage

Lockout

Registers

GND

NOTE: All pullup resistors should be connected to

V_CCsuch that no pullup is applied during

backup supply operation.

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

12 3 4 5 6 7...31

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