Meter-on-a-chip runs on a coin cell

15jan14AnalogSimpleBlock 648Analog Devices is aiming at portable heathcare with a precision meter-on-a-chip that will run on a coin cell.

ADuCM350 has a 16bit analogue front-end (AFE) which includes a multi-sensor switch matrix, hardware waveform generator, discrete Fourier transform (DFT) engine, and an ARM Cortex-M3 microcontroller.

Applications are expected in point-of-care diagnostics, home self-test health devices, wearable vital signs monitors, and sports and fitness monitors.

The auto-calibrating AFE includes a 16bit 160ksample/s ADC, +/-0.2% voltage reference, and 12bit no-missing-code DAC.

“Passive complex impedance sensing enables baseline detection and detailed information of physiological, biological and electrochemical reactions, at levels previously unattainable,” said the firm. “The fusion of passive and active sensors provides an additional level of signal measurement accuracy, and environmentally robust capacitance-to-digital technology supports new use cases such as skin electrode detection and next-generation electrochemical test strip technologies.”

15jan14AnalogBlock 874An example of sensor fusion, according to the firm, is calorie burn estimation by combining galvanic skin response for heart rate and respiration, with a three axis MEMS accelerometer for altitude and motion detection.

I/O peripherals include: USB, audio, display, serial and touch.

supports differentiation and rapid feature expansion. The ADuCM350 AFE sequencer enables designers to develop the software for a measurement procedure only once and then reliably port it across an entire product family.

The Cortex-M3 runs at 16MHz and hax 384kbyte of flash, 16kbyte EEPROM, and 32kbyte SRAM, as well as hardware accelerators for waveform generation and filtering.

It is sampling now with production slated for April.

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3 Comments

  1. Spehro
    February 13, 2014 05:06

    They seem to want you to sign an NDA (and register in order to get the NDA form) in order to get a datasheet, and even so I’ll bet that things like maximum current draw may not be fully characterized.

    “A complete datasheet for this product is available upon receipt of a signed non-disclosure agreement (NDA) submitted to ADI’s healthcare group. To receive an NDA form, please register.”

  2. steve bush
    January 13, 2014 11:54

    Hi Robert.
    I asked myself the same question, and would normally have removed the power claim when it was not backed up with figures or a data sheet.
    However, as AD is one of the companies that have a really good record of honesty, I left the coin cell bit in, with a note-to-self to check it later.
    Sadly, the data sheet is only a preliminary. I have phoned ADI to request the information.
    Stveve

  3. Robert
    January 10, 2014 23:13

    That could be an interesting device from AD. You mentioned that it runs off a coin cell, sounds great. This statement would be true for pretty much all Cortex-M based devices. The question is “how long?”.
    This kind of application does not need high speed, hence the 16 MHz is fine, although it will exclude many other applications that would benefit from the analog features of this chip but need more performance.
    In a nutshell: to make the information “running from a coin cell” more useful, please add power numbers, expected life time… etc.

    Thanks, Robert