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Name: DS12CR887-33+
Brand: Analog Devices Inc./Maxim Integrated
SKU: DS12CR887-33+
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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Analog Devices Inc./Maxim Integrated DS12CR887-33+

Part No.:: DS12CR887-33+

Manufacturer:: Analog Devices Inc./Maxim Integrated

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

Datasheet:: DS12CR887-33+.pdf

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

In Stock:: 1398

Quantity:: Add To Cart

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DS12CR887-33+ Typical application Circuitry

DS12CR887-33+

The DS12CR887-33+ is a highly integrated real-time clock (RTC) with NV (Non-Volatile) SRAM, a full clock calendar, and a battery-backed operation, designed by Maxim Integrated. It's tailored for applications requiring accurate timekeeping under battery power during the absence of a primary power source, combined with the need for non-volatile data storage.

Key Features and Parameters:

- Integrated Battery Backup: Ensures clock/calendar functionality and SRAM data retention during power loss.

- Real-Time Clock/Calendar: Tracks time in hours, minutes, and seconds; date in days, months, and years.

- NV SRAM: Provides non-volatile storage for critical data, protected during power failures.

- Serial Interface: Enables microcontroller or processor communication with a straightforward serial interface.

- Wide Voltage Range: Operates across a broad spectrum of supply voltages, enhancing its adaptability to various system designs.

Application Scenario – Uninterruptible Power Supply (UPS) System:

In an UPS system, maintaining system logs and event timestamps is crucial for diagnostics and maintenance. The DS12CR887-33+ can be used to keep accurate records of power events and system status changes over time, even during power outages.

Circuit Design Details:

1. Power Supply and Backup:

- VCC (Pin 24): Connect to the main +3.3V power supply. Include a 0.1µF decoupling capacitor close to this pin for noise reduction.

- VBAT (Pin 20): Attach to an external battery to maintain clock and SRAM operations during main power failures. The battery choice should consider the longevity and voltage stability requirements.

2. Grounding:

- GND (Pin 12): Establish a firm connection to the system's ground plane. A solid ground connection is essential for minimizing operational noise and ensuring stability.

3. Serial Communication:

- SDA (Serial Data, Pin 1): Serves as the bidirectional data line for serial communication with the controlling microcontroller.

- SCL (Serial Clock, Pin 2): Connect to the microcontroller's clock output, synchronizing data transfer.

- CE (Chip Enable, Pin 22): An active-high signal that initiates the communication session with the DS12CR887-33+. This pin must be driven high by the microcontroller before data transfer.

4. Memory and Clock Access:

- AS (Address Strobe, Pin 23): Controls the addressing for SRAM read/write operations. Pulses high to latch the address from the serial data stream.

- R/W (Read/Write Control, Pin 27): Dictates the operation mode. Drive high for reading operations and low for writing data or clock/calendar settings.

Design Considerations:

- Battery Selection: Opt for a high-quality battery with a stable discharge rate to ensure reliable backup power for the RTC and SRAM functions over an extended period.

- Signal Integrity: Given the serial interface's sensitivity, careful PCB layout to minimize noise and signal distortion is paramount. Keep the communication lines short and well-protected from electromagnetic interference.

- Power Stability: The primary power source should be regulated and free from significant fluctuations to avoid erroneous operation or data corruption.

- Firmware Integration: Develop robust firmware for the microcontroller that efficiently manages serial communication, error handling, and data processing. Incorporating clock synchronization routines and SRAM data management logic is crucial.

- Environmental Conditions: Consider the operating environment, especially if the UPS system is deployed in areas with extreme temperatures or humidity, ensuring the DS12CR887-33+ and its battery operate within their specified ranges.

Deploying the DS12CR887-33+ within a UPS system not only provides precise timekeeping for event logging but also offers a reliable non-volatile storage solution for critical data, enhancing system diagnostics and reliability. This application underscores the versatility of the DS12CR887-33+ in maintaining operational integrity and data accuracy, even in the face of power uncertainties.

DS12CR887-33+ information

DS12CR887-33+ Specifications

Package/Case:
24-DIP Module (0.600, 15.24mm)
Packaging:
Tube
Series:
-
ProductStatus:
Active
Type:
Clock/Calendar
Features:
Alarm, Leap Year, NVSRAM, Square Wave Output, Trickle-Charger
MemorySize:
114B
TimeFormat:
HH:MM:SS (12/24 hr)
DateFormat:
YY-MM-DD-dd
Interface:
Parallel
Voltage-Supply:
2.97V ~ 3.63V
Voltage-SupplyBattery:
2V ~ 3.05V
Current-Timekeeping(Max):
2mA @ 2.97V ~ 3.63V
OperatingTemperature:
-40°C ~ 85°C
MountingType:
Through Hole

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6. What is the process for return or replacement of DS12CR887-33+?

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 DS12CR887-33+ we delivered, we will accept the replacement or return of the DS12CR887-33+ 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 DS12CR887-33+.

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

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(1)Inform us within 90 days

(2)Obtain Requesting Return Authorizations