BQ32002 Datasheet, PDF (1/29 Pages) Texas Instruments – BQ32002 Real-Time Clock (RTC)

Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
BQ32002
SLUSA96B – AUGUST 2010 – REVISED APRIL 2016
BQ32002 Real-Time Clock (RTC)
1 Features
•1 Automatic Switchover to Backup Supply
• I²C Interface Supports Serial Clock
up to 400 kHz
• Uses 32.768-kHz Crystal With
–63-ppm to +126-ppm Adjustment
• Integrated Oscillator-Fail Detection
• 8-Pin SOIC Package
• –40°C to +85°C Ambient Operating Temperature
2 Applications
General Consumer Electronics
3 Description
The BQ32002 device is a compatible replacement for
industry standard real-time clocks.
The BQ32002 features an automatic backup supply
that can be implemented using a capacitor or non-
rechargeable battery. The BQ32002 has a
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.
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
capacitor near supply pin
1 µF
V_CC
VBACK
OSCI
Automatic
Backup
Switch
VCORE
Interrupt
Generator
OSCO
32-kHz
Oscillator
I2C Register
Interface With
Undervoltage
Lockout
Registers
V_CC
IRQ
4.7 kW 4.7 kW 4.7 kW
SCL
SDA
SCL
SDA
____
IRQ
BQ32 00 2
Real-Time
Clock
Copyright © 2016, Texas Instruments Incorporated
GND
Copyright © 2016, Texas Instruments Incorporated
NOTE: All pullup resistors should be connected to
V_CC 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.