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Name: BQ4285LS
Brand: Texas Instruments
SKU: BQ4285LS
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 BQ4285LS

Part No.:: BQ4285LS

Manufacturer:: Texas Instruments

Package:: 24-SOIC (0.295, 7.50mm Width)

Datasheet:: BQ4285LS.pdf

Description:: IC RTC W/114X8 NVSRAM 24-SOP

In Stock:: 976

Quantity:: Add To Cart

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BQ4285LS Specifications

Package/Case:
24-SOIC (0.295, 7.50mm Width)
Packaging:
Tube
Series:
*
ProductStatus:
Obsolete
Type:
Clock/Calendar
Features:
Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output
MemorySize:
114B
TimeFormat:
HH:MM:SS (12/24 hr)
DateFormat:
YY-MM-DD-dd
Interface:
Parallel
Voltage-Supply:
2.7V ~ 3.6V
Voltage-SupplyBattery:
2.4V ~ 4V
Current-Timekeeping(Max):
-
OperatingTemperature:
-
MountingType:
Surface Mount

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BQ4285LS information

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Basic introduction and simple engineering application of BQ4285LS

BQ4285LS is a versatile real-time clock (RTC) IC manufactured by Texas Instruments, commonly used in electronic systems for timekeeping and timestamping functionalities. It integrates a highly accurate crystal oscillator, calendar, and alarm features, making it suitable for a wide range of applications.

Application Scenario:

In a digital alarm clock project, BQ4285LS can be utilized to provide precise timekeeping and alarm functions, ensuring accurate time display and timely alarms for the user.

Circuit Design:

To create a digital alarm clock using BQ4285LS, follow these steps:

1. RTC Connection:

Connect the BQ4285LS IC to the microcontroller or host processor using the I2C or SPI interface. Ensure proper voltage levels and communication protocol configuration for seamless communication.

2. Crystal Oscillator:

Connect an external crystal oscillator to the XTAL pins of BQ4285LS to provide the clock source for accurate timekeeping. Choose a crystal with the appropriate frequency for the desired time accuracy.

3. User Interface:

Integrate user interface components such as an LCD display and buttons for setting the time and alarms. Utilize GPIO pins of the microcontroller to interface with these components and control their functionalities.

4. Alarm Configuration:

Program the alarm registers of BQ4285LS using the microcontroller to set the desired alarm time and enable the alarm functionality. Configure the alarm output pin to trigger an interrupt or drive an external alarm indicator.

5. Power Management:

Implement power supply and management circuitry to provide stable power to BQ4285LS and the rest of the system. Include voltage regulators and decoupling capacitors to ensure reliable operation and minimize noise.

Experiment Steps:

Step 1: Connect the BQ4285LS to the microcontroller development board or host processor using the I2C interface. Ensure proper wiring and address configuration.

Step 2: Connect an external 32.768 kHz crystal oscillator to the XTAL pins of BQ4285LS. Verify the connection and oscillation using an oscilloscope or multimeter.

Step 3: Write firmware code to initialize the BQ4285LS RTC, set the current time, and configure alarm settings. Test the functionality by reading the current time and verifying alarm triggering.

Step 4: Integrate an LCD display and buttons to the microcontroller board. Write code to display the current time and allow user interaction for setting alarms.

Step 5: Complete the circuit by providing power and verifying the overall functionality of the digital alarm clock. Test different alarm scenarios and ensure accurate timekeeping.

Considerations:

When designing the digital alarm clock circuit, consider the following factors:

- Crystal Accuracy: Choose a high-quality crystal oscillator to ensure accurate timekeeping and minimize clock drift over time.

- Power Consumption: Optimize the firmware and hardware design to minimize power consumption, especially in low-power standby modes to prolong battery life.

- User Experience: Design an intuitive user interface with clear instructions for setting the time and alarms, ensuring ease of use for the end-user.

- Alarm Reliability: Test the alarm functionality thoroughly under various conditions to ensure reliable triggering and timely notifications.

- System Integration: Consider the overall system integration requirements and compatibility with other components or modules in the electronic system.

BQ4285LS FAQ

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3. Are the BQ4285LS price and inventory displayed accurate?

The price and inventory of BQ4285LS fluctuates frequently and cannot be updated in time, it will be updated periodically within 24 hours. And, our quotation usually expires after 5 days.

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Warm Tips: It may take up to 24 hours for the carriers to display tracking information. Usually, express delivery takes 3-5 days, and registered mail takes 25-60 days.

6. What is the process for return or replacement of BQ4285LS?

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 BQ4285LS we delivered, we will accept the replacement or return of the BQ4285LS 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 BQ4285LS.

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

Two processes to return the products:

(1)Inform us within 90 days

(2)Obtain Requesting Return Authorizations