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Analog Devices Inc./Maxim Integrated DS1687-5IND

Part No.:: DS1687-5IND

Manufacturer:: Analog Devices Inc./Maxim Integrated

Package:: 24-DIP Module (0.600, 15.24mm)

Datasheet:: DS1687-5IND.pdf

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

In Stock:: 2887

Quantity:: Add To Cart

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DS1687-5IND Specifications

Package/Case:
24-DIP Module (0.600, 15.24mm)
Packaging:
Tube
Series:
-
ProductStatus:
Obsolete
Type:
Clock/Calendar
Features:
Alarm, NVSRAM, Square Wave Output, Y2K
MemorySize:
242B
TimeFormat:
HH:MM:SS (12/24 hr)
DateFormat:
YY-MM-DD-dd
Interface:
Parallel
Voltage-Supply:
4.5V ~ 5.5V
Voltage-SupplyBattery:
2.5V ~ 3.7V
Current-Timekeeping(Max):
3mA @ 5V
OperatingTemperature:
-40°C ~ 85°C
MountingType:
Through Hole

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DS1687-5IND information

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DS1687-5IND Typical application Circuitry

DS1687-5IND

The DS1687-5IND is a real-time clock (RTC) chip with integrated NV (Non-Volatile) SRAM, manufactured by Maxim Integrated. It's specifically designed for industrial applications, providing accurate timekeeping and data storage capabilities under extreme conditions. The "IND" in its model number signifies its suitability for industrial environments, with a temperature range that typically covers -40°C to +85°C, ensuring reliable operation in challenging conditions.

Key Features and Parameters:

- Integrated Non-Volatile SRAM: Offers built-in storage for data that must be preserved during power loss, making it ideal for applications requiring data logging or retention of critical parameters.

- Extended Temperature Range: Designed to operate in industrial temperature ranges, ensuring functionality in diverse environments.

- Battery-Backed Real-Time Clock: Keeps accurate time and date, continuing to run on battery power when the main power supply is lost.

- Serial Interface: Facilitates communication with microcontrollers or processors for setting the time or reading stored data.

- Watchdog Timer: Provides an additional layer of reliability by resetting the system in case of malfunction or if a specific event doesn't occur within a predetermined time frame.

Application Scenario – Industrial Process Control System:

In an industrial setting, where monitoring and controlling processes in real-time is critical, the DS1687-5IND can be utilized to maintain accurate time stamps for events and store system parameters safely, even during power failures.

Circuit Design Details:

1. Power Supply Connection:

- VCC (Pin 24): Connect to a +5V power source. Use a 0.1µF decoupling capacitor near this pin to minimize power supply noise, ensuring stable operation of the RTC and SRAM.

2. Ground Connection:

- GND (Pin 12): Securely connect to the system's ground. A solid ground connection is crucial for minimizing operational noise and ensuring the accuracy of the RTC.

3. Battery Backup:

- VBACKUP (Pin 20): Attach to a 3V lithium battery. This connection ensures that the RTC continues to function and the SRAM retains its data during power outages. Include a diode in series with the battery to prevent charging.

4. Serial Communication Interface:

- SDA (Serial Data, Pin 1): This bidirectional pin connects to the microcontroller for data communication.

- SCL (Serial Clock, Pin 2): Connect to the clock line from the microcontroller to synchronize data transfer.

5. Watchdog Timer Configuration:

- WDALM (Watchdog Alarm, Pin 23): This output can be connected to a reset input on the microcontroller, enabling the watchdog functionality to reset the system in case of an error or hang-up.

Design Considerations:

- Environmental Protection: Given its industrial application, ensure the DS1687-5IND and its battery backup system are protected from extreme temperatures, moisture, and dust.

- Battery Life: Consider the battery's lifespan and the system's expected operational life. Plan for easy battery replacement or choose a battery with a capacity well beyond the expected service period.

- Signal Integrity: Keep the traces for SDA and SCL short and well-protected from industrial noise sources to maintain communication integrity with the microcontroller.

- Firmware Integration: Develop robust firmware capable of managing serial communication with the DS1687-5IND, including setting up the RTC, reading/writing to the SRAM, and handling the watchdog timer.

- Power Management: Design the system to minimize power consumption, especially when operating on battery backup, to extend the life of the backup battery.

Incorporating the DS1687-5IND into an industrial process control system not only provides precise timekeeping and reliable data storage but also enhances system reliability through its watchdog timer functionality. This application underscores the DS1687-5IND's value in critical industrial applications where maintaining operation and data integrity during power failures is paramount.

DS1687-5IND FAQ

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6. What is the process for return or replacement of DS1687-5IND?

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 DS1687-5IND we delivered, we will accept the replacement or return of the DS1687-5IND 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 DS1687-5IND.

(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