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1338

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Product Longevity: 2040

Real-Time Clock With Battery Backed Non-Volatile RAM

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Overview

The 1338 is a serial real-time clock (RTC) device that consumes ultra-low power and provides a full binary-coded decimal (BCD) clock/calendar with 56 bytes of battery backed Non-Volatile Static RAM. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator. The end of the month date is automatically adjusted for months with fewer than 31 days, including corrections for leap year. Access to the clock/calendar registers is provided by an I2C interface capable of operating in fast I2C mode. Built-in Power-sense circuitry detects power failures and automatically switches to the backup supply, maintaining time and date operation.

1338 - Block Diagram
1338 - Pinout
1338 - Block Diagram
1338 - Pinout
  • Real-Time Clock (RTC) counts seconds, minutes, hours, day, date, month, and year with leap-year compensation valid up to 2100
  • 56-Byte battery-backed Non Volatile RAM for data storage
  • Fast mode I2C Serial interface
  • Automatic power-fail detect and switch circuitry
  • Programmable square-wave output
  • Packaged in 8-pin MSOP, 8-pin SOIC, or 16-pin SOIC (surface-mount package with an integrated crystal)
  • Industrial temperature range (-40°C to +85°C)

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Support Communities

  1. Problem with DA1453 with HID keyboard example while linking

    Hello.We are programming the DA14531 SoC.We have:1. debug board DA14531-00FXDEVKT-U with module DA14531MOD-00F01002.2. we use IDE Keil 5.38a3. we use SDK 6.0.204. We use compiler version 6.12 We use examples only from SDK 6.0.20 (and SDK 6 ...

    Jan 26, 2024
  2. I2C Write Operation

    Hi Renesas,I'm using the DA14531 EVBoard and SDK_6.0.20.1338.| I'm currently facing an issue while writing data over I2C. I'm using the following command to write, and in my case, I need to write 4 bytes to a register. However, when I read ...

    May 5, 2025
  3. DA14531MOD UART DMA

    ... OP_BLOCKING, UART_OP_INTR, UART_OP_DMA buffer[9] = 0; // make it a null terminated string arch_printf("\r\nbuffer: %s", buffer); // ******************** wdg_reload(WATCHDOG_DEFAULT_PERIOD); wdg_resume(); spi_flash_power_down(); } I'm using SDK v6.0.20.1338 Thanks. Best regards, Javier

    Jun 28, 2024
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