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  • Author Author: rscasny
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Poll: Are you interested in roadtesting I2C Real-Time Clock with Integrated MEMS Oscillator

I was contacted by the sponsor who was interested in having its Real Time Clock EVM roadtested. I would be interested in getting your thoughts on this product. Thanks.

 

Here's some facts about the product:

 

The MAX31343 shield is a fully assembled and tested PCB to evaluate the MAX31343, low-cost, extremely accurate, real-time clock (RTC) with an I2C interface and power management. The shield operates from a single supply, either from a USB or external power supply, and the integrated microelectromechanical systems (MEMS) resonator enhances the long-term accuracy and eliminates the external crystal requirement in the system. This device is accessed through an I2C serial interface provided by a MAX32625 PICO board. The MAX31343 shield provides the hardware and software user interface (GUI) necessary to evaluate the MAX31343. The shield includes a MAX31343EKA+T. It connects to the PC through a MAX32625 PICO board and a Micro USB cable.

MAX31343 Shield

Features

  • Easy Evaluation of the MAX31343
  • +1.6V to +5.5V Single-Supply Operation
  • Proven PCB Layout
  • Fully Assembled and Tested
  • ArduinoRegistered/MbedRegistered Platform Compatible

 

Contents

  • Assembled MAX32625 PICO controller board
  • Micro USB cable
  • Assembled circuit board including MAX31343EKA+T

 

Additional Information

  • in reply to hlipka

    It is good point to prevent promising over-the-year time deviation test in roadtest application... image

     

    I think the deadline extension is not needed. I am not sure how did you calculated minute per two months? Datasheet mention maximum deviation 0.432 seconds per day) 0.432 * 60 is less then half of minute. Please correct me If I calculate something wrongly. Deviation 13 seconds per month (12.96 seconds per 30 days) I consider testable within roadtest 60 days period. Bundled MCU (candidate for "accurate" reference "test equipment" for testing) board (MAX32625PICO) has onboard crystal ECS-.327-6-12-TR with nominal frequency 32.768 KHz and accurancy +- 20 ppm and I am not sure if this can be tested using this MCU because you must take in account inaccurancy of this (partially DIY) measurement tool (MCU). Of course you can use any platform with more accurate crystal (or other clock generator) for testing.

     

    I usually trust vendors about these parameters. If I decide to apply this roadtest I will point other parts and applications of this chip/shield rather than checking that chip matches datasheet parameters.

  • Thats a roadtest where you might get asked to prolong it. It really cries to do some long-term comparisons (against other RTC like the PCF2129, and against a real clock). And with 5ppm its only about a minute over 2 months...

  • Good potential for controlling or synchronizing IoT sensor systems.

     

    DAB

  • 5ppm compares favorably to a standard crystal at 150ppm.

    Here is the datasheet for the MAX31343 chip:

    https://datasheets.maximintegrated.com/en/ds/MAX31343.pdf