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Overview

Description

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.

Features

  • 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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ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on the CAD Model links in the Product Options table. If a symbol or model isn't available, it can be requested directly from SamacSys.

Diagram of ECAD Models

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Support Communities

  1. DA14531 RTC example

    Hi Renesas, I'm trying to follow the RTC example explained in this link:4. DA14531 Real Time Clock (RTC) — DA145XX Tutorial SDK peripherals (renesas.com) I have followed the steps but when I try to debug I get: JLink Error: Cannot read register X while CPU is running. I ...

    Mar 7, 2024
  2. problem with TC1602A Display,,help me please!,,

    hi expert,i want to use 2x16 caracter lcd,,TC1602A-09,, with r8c R5F21238DFP.i wrote some code using C language and it is running on PIC microkontrollers but,not on r8c. I also use 8 bit display mode on tc1602-09.Could you help me sending sample code,please ...

    May 26, 2012
  3. Put DA14531MOD into low power mode

    ... second: void user_app_init(void) { ... rtc_register_intr(rtc_interrupt_cb, RTC_EVENT_SEC); ... } I have no clue of what I'm doing wrong, I have checked the example ble_app_sleepmode but I'm missing something. I'm using SDK v6.0.20.1338. Thanks. Best regards, Javier

    Apr 11, 2024
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