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Name: BQ4802YDWR
Brand: Texas Instruments
SKU: BQ4802YDWR
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 BQ4802YDWR

Part No.:: BQ4802YDWR

Manufacturer:: Texas Instruments

Package:: 28-SOIC (0.295, 7.50mm Width)

Datasheet:: BQ4802YDWR.pdf

Description:: IC RTC CLK/CALENDAR PAR 28-SOIC

In Stock:: 810

Quantity:: Add To Cart

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BQ4802YDWR this integrated circuit is available in factory sealed anti static packs. at icwhale.com. Please read product page below detail information. including BQ4802YDWR price, data-sheet, in-stock availability, technical difficulties. Also. Quickly Enter the access of compare listing to find out replaceable electronic parts. If you want to retrieve comprehensive data for BQ4802YDWR to optimize the supply chain (including cross references, life-cycle, parametric, counterfeit risk, obsolescence managements forecasts), please contact to our Tech-supports team.

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Basic introduction and simple engineering application of BQ4802YDWR

BQ4802YDWR is a real-time clock (RTC) chip commonly used in electronic systems to keep track of time and date information with high precision. It offers features such as battery backup, alarm functionality, and integrated oscillator circuitry.

Application Scenario:

In a digital alarm clock project, BQ4802YDWR can be utilized to maintain accurate timekeeping functionality, ensuring the clock displays the correct time even after power cycles.

Circuit Design:

To create a digital alarm clock using BQ4802YDWR, follow these steps:

1. Clock Chip Integration:

Connect BQ4802YDWR to the microcontroller, such as an Arduino or Raspberry Pi, using the Inter-Integrated Circuit (I2C) communication protocol. Wire the SDA and SCL pins of the clock chip to the corresponding pins on the microcontroller.

2. Power Supply:

Ensure the proper power supply is provided to BQ4802YDWR. The chip typically operates within a voltage range of 2.7V to 5.5V. Connect the VCC and GND pins of the clock chip to a stable power source within this range.

3. External Crystal:

Connect an external 32.768 kHz crystal oscillator to the X1 and X2 pins of BQ4802YDWR to ensure accurate timekeeping. Use capacitors to stabilize the crystal oscillator circuit.

4. User Interface:

Design a user interface using a display module, such as an LCD or OLED screen, to show the current time and set alarm configurations. Utilize the microcontroller's GPIO pins to control the display and accept user input (e.g., buttons for setting the time and alarm).

5. Alarm Functionality:

Implement alarm functionality using the features provided by BQ4802YDWR. Set the desired alarm time in the chip's registers and configure interrupts on the microcontroller to trigger events when the alarm time is reached.

Experiment Steps:

To understand the functionality of BQ4802YDWR, perform the following experiment:

1. Circuit Setup:

Connect BQ4802YDWR to an Arduino Uno using the I2C protocol. Wire the SDA pin of the clock chip to A4 and the SCL pin to A5 on the Arduino.

2. Power Connection:

Provide power to BQ4802YDWR by connecting its VCC pin to the 5V output of the Arduino.

3. Crystal Oscillator:

Connect a 32.768 kHz crystal oscillator between the X1 and X2 pins of BQ4802YDWR. Add two 12.5pF capacitors between each pin and ground to stabilize the oscillator circuit.

4. Arduino Sketch:

Write an Arduino sketch to initialize the clock chip, read the current time, and display it on an LCD screen. Additionally, implement alarm functionality to trigger an LED when a specific time is reached.

5. Testing:

Upload the sketch to the Arduino and test the digital alarm clock. Set different alarm times and verify that the clock accurately keeps time and triggers the alarm when expected.

Considerations:

When designing the circuit and writing the firmware, consider:

- Power Consumption: Optimize the code and circuitry to minimize power consumption, ensuring prolonged battery life if the clock is battery-powered.

- User Interface: Design an intuitive user interface to make setting the time and alarm configurations user-friendly.

- Accuracy: Calibrate the clock periodically to maintain accurate timekeeping, considering factors like temperature variations that may affect the crystal oscillator's frequency.

- Interrupt Handling: Implement robust interrupt handling in the firmware to ensure reliable alarm triggering without missing any events.

- Circuit Protection: Incorporate measures such as voltage regulators and reverse polarity protection to safeguard the circuit from potential damage due to power supply issues.

BQ4802YDWR information

BQ4802YDWR Specifications

Package/Case:
28-SOIC (0.295, 7.50mm Width)
Packaging:
Tape & Reel (TR),Cut Tape (CT),Digi-Reel®
Series:
-
ProductStatus:
Active
Type:
Clock/Calendar
Features:
Alarm, Daylight Savings, Leap Year, Supervisor, Watchdog Timer
MemorySize:
-
TimeFormat:
HH:MM:SS (12/24 hr)
DateFormat:
YY-MM-DD-dd
Interface:
Parallel
Voltage-Supply:
4.5V ~ 5.5V
Voltage-SupplyBattery:
2.4V ~ 4V
Current-Timekeeping(Max):
1.5mA (Typ) @ 4.5 V ~ 5.5 V
OperatingTemperature:
0°C ~ 70°C
MountingType:
Surface Mount

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6. What is the process for return or replacement of BQ4802YDWR?

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(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 BQ4802YDWR.

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

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