BQ32000DR device package

BQ32000DR schematic symbol

An RTC (real time clock) is an integrated circuit which houses a very precise and accurate clock for time keeping in digital electronic circuits. The RTCs are very commonly used in computers, laptops, mobile phones, servers, and other embedded systems. In fact they are used in all those digital circuits which require accurate time keeping. One of the major advantages of RTC is that they include a backup source of power and keep on functioning even when the main system’s power is shut off. The backup power source used to be Lithium-ion batteries in older RTCs however super-capacitors are mainly used in modern RTCs. The other advantages of RTC include low power consumption and accurate time keeping. RTCs use a 32.768 kHz crystal oscillator for clock pulse generation. The typical accuracy of these clocks is around 5 parts per million. Apart from standalone ICs, RTCs are also commonly integrated into microcontroller ICs.

Table of Contents

What is BQ32000DR？

The BQ32000DR is a real time clock integrated circuit designed by Texas Instruments. This RTC is designed a compatible replacement of industry standard RTCs. The device houses an automatic backup power source with integrated trickle charger. The calibration of the device is adjustable within the range of -63ppm to +126ppm. The device registers are updated every second and there is no timing glitch in the system. The device also features leap year compensation and compensation for months with less than 31 days. This RTC chip can be interfaced to the microcontrollers using I2C protocol. The device comes in a SOIC-8 package.

Pin Configuration

The pin configuration of the BQ32000DR real time clock is given in the table below:

Pin number	Pin name	Pin description
1	OSCI	Oscillator input pin
2	OSCO	Oscillator output pin
3	V_BACK	Backup battery voltage pin
4	GND	Ground pin
5	Vcc	External supply voltage
6	IRQ	Configurable interrupt output
7	SCL	Serial clock pin
8	SDA	Serial data pin

Features

Very accurate time keeping
Compensation for leap years
Compensation for months less than 31 days
I2C serial communication interface
Integrated oscillator fail detection
Low power consumption
Automatic power sensing and switching

Applications

The applications of BQ32000DR real time clock are provided as following:

Single board computers
PC/laptop motherboards
Instrument clusters
Automotive electronics
Avionic systems
Smart phones and tablets
Programmable logic controllers
Telecom equipment
Embedded systems

Specifications

The major technical specifications of the BQ32000DR real time clock IC are provided as following:

Terminals: 8
Package: SOIC-8
Max input voltage: 4V
Max junction temperature: 150 degrees
ESD rating: 2000V (HBM)
Input voltage range: -0.5V to 7V
Leakage current: 1uA
Pre-calibration accuracy: 35ppm
Max I2C clock frequency: 400kHz

Alternatives

DS1391U-3 , DS1390U-3 , DS1390U-3+T&R;

How BQ32000DR work?

The BQ32000DR is a real time clock IC from Texas Instruments. This RTC IC is very widely used in laptops, motherboards, consumer electronics, telecom systems, automotive applications and embedded system. This RTC chip is capable of providing very accurate data about seconds, days, months, years and dates. The RTC chip contains a backup power source which allows it to keep functioning for extended periods of time even when the main power source is shut off. This IC can be interfaced to the microcontrollers and microprocessors using I2C interface.

A typical application circuit of the BQ32000DR is given in the figure below:

BQ32000DR Related Products Prices

Parts	Mfr.	Description	Stock	Prices
BQ32000DR	Texas Instruments	IC RTC CLK/CALENDAR I2C 8-SOIC	1000	$0.435 Lowest
BQ32002DR	Texas Instruments	IC RTC CLK/CALENDAR I2C 8-SOIC	109	$0.798 Lowest
BQ32000D	Texas Instruments	REAL-TIME CLOCK (RTC)	561	RFQ