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Name: BQ3287EAMT
Brand: Texas Instruments
SKU: BQ3287EAMT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Any Feature, including a modified Existing Feature, that is not an Existing Feature.

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Texas Instruments BQ3287EAMT

Part No.:: BQ3287EAMT

Manufacturer:: Texas Instruments

Package:: 24-DIP Module (0.61, 15.49mm)

Datasheet:: BQ3287EAMT.pdf

Description:: IC RTC CLK/CALENDAR PAR 24-DIP

In Stock:: 3867

Quantity:: Add To Cart

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BQ3287EAMT Specifications

Package/Case:
24-DIP Module (0.61, 15.49mm)
Packaging:
Tube
Series:
-
ProductStatus:
Obsolete
Type:
Clock/Calendar
Features:
Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output
MemorySize:
242B
TimeFormat:
HH:MM:SS (12/24 hr)
DateFormat:
YY-MM-DD-dd
Interface:
Parallel
Voltage-Supply:
4.5V ~ 5.5V
Voltage-SupplyBattery:
-
Current-Timekeeping(Max):
-
OperatingTemperature:
0°C ~ 70°C
MountingType:
Through Hole

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BQ3287EAMT information

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Basic introduction and simple engineering application of BQ3287EAMT

BQ3287EAMT is a real-time clock (RTC) chip manufactured by Texas Instruments, commonly used in electronic devices for timekeeping and timestamping functionalities. It features a built-in temperature-compensated crystal oscillator (TCXO), battery backup, and low power consumption.

Application Scenario:

In a digital alarm clock project, BQ3287EAMT can be utilized to maintain accurate timekeeping even during power outages or when the main power source is disconnected. Additionally, it can provide timestamping capabilities for data logging applications.

Circuit Design:

To integrate BQ3287EAMT into a digital alarm clock project, follow these steps:

1. Clock Connection:

Connect the crystal oscillator pins, X1 and X2, of BQ3287EAMT to an external 32.768 kHz crystal oscillator for accurate timekeeping. Ensure proper decoupling capacitors are connected across the crystal oscillator terminals for stable operation.

2. Power Supply:

Provide power to BQ3287EAMT by connecting the VCC pin to a regulated 3.3V or 5V power supply. Additionally, connect the GND pin to the ground reference of the circuit.

3. Battery Backup:

Connect a coin cell battery to the BAT pin of BQ3287EAMT to maintain timekeeping functionality during power loss. Ensure proper polarity and consider implementing a battery holder for easy replacement.

4. Control Interface:

Interface BQ3287EAMT with the microcontroller using the I2C or SPI communication interface. Configure the microcontroller to send commands and receive data from the RTC chip for setting and reading time values.

5. Alarm Functionality:

Utilize the alarm features of BQ3287EAMT to trigger events at specific times. Configure the alarm registers and interrupt pins to generate interrupts or toggle output signals when the specified alarm time is reached.

Experiment:

To experiment with BQ3287EAMT in a digital alarm clock project, follow these steps:

1. Hardware Setup:

Connect the crystal oscillator, power supply, and battery backup to BQ3287EAMT according to the circuit design described above.

2. Microcontroller Integration:

Interface BQ3287EAMT with a microcontroller, such as Arduino or Raspberry Pi, using the I2C or SPI protocol. Install any necessary libraries or drivers to facilitate communication.

3. Time Setting:

Write firmware code to set the current time and date in BQ3287EAMT registers. Use the microcontroller's serial monitor or a custom user interface to input the time values.

4. Alarm Configuration:

Program the alarm registers of BQ3287EAMT to trigger an interrupt or toggle an output pin at a specific time. Test the alarm functionality by setting different alarm times and observing the corresponding actions.

5. Power Loss Simulation:

Simulate a power loss scenario by disconnecting the main power supply or removing the battery backup. Verify that BQ3287EAMT maintains accurate timekeeping and continues to operate using the battery backup.

Considerations:

When working with BQ3287EAMT, keep the following considerations in mind:

- Crystal Oscillator Calibration: Calibrate the crystal oscillator frequency to compensate for manufacturing variations and temperature effects.

- Battery Life: Choose a high-quality coin cell battery with sufficient capacity to ensure long-term reliability and minimize the frequency of battery replacements.

- Interrupt Handling: Implement efficient interrupt service routines (ISRs) in the microcontroller firmware to respond promptly to alarms and maintain accurate timekeeping.

- ESD Protection: Handle BQ3287EAMT and associated components with care to prevent electrostatic discharge (ESD) damage, especially during soldering and assembly.

- PCB Layout: Design the PCB layout to minimize noise and interference, especially around the crystal oscillator and communication lines, to ensure reliable operation of BQ3287EAMT.

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6. What is the process for return or replacement of BQ3287EAMT?

All goods will implement Pre-Shipment Inspection (PSI), selected at random from all batches of your order to do a systematic inspection before arranging the shipment. If there is something wrong with the BQ3287EAMT we delivered, we will accept the replacement or return of the BQ3287EAMT only when all of the below conditions are fulfilled:

(1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.

(2)We are informed of the defect described above within 90 days after the delivery of BQ3287EAMT.

(3)The PartNo is unused and only in the original unpacked packaging.

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