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BQ32002 PDF预览

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)

BQ32002 数据手册

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BQ32002  
SLUSA96B AUGUST 2010REVISED APRIL 2016  
BQ32002 Real-Time Clock (RTC)  
1 Features  
3 Description  
The BQ32002 device is a compatible replacement for  
industry standard real-time clocks.  
1
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  
a
–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  
VCC  
Simplified Schematic  
3.0 to 3.6 V  
Place supply-decoupling  
1 µF  
capacitor near supply pin  
BQ32002  
SCL  
VCC  
VCC  
VBACK  
Automatic  
Backup  
Switch  
Real-Time  
SDA  
Clock  
4.7 kW  
4.7 kW 4.7 kW  
VCORE  
____  
IRQ  
IRQ  
Interrupt  
Generator  
OSCI  
32-kHz  
Oscillator  
SCL  
SDA  
Copyright © 2016, Texas Instruments Incorporated  
I2C Register  
OSCO  
Interface With  
Undervoltage  
Lockout  
Registers  
GND  
Copyright © 2016, Texas Instruments Incorporated  
NOTE: All pullup resistors should be connected to  
VCC such that no pullup is applied during  
backup supply operation.  
1
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.  
 
 
 
 
 

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