Withings Body Cardio Teardown

ID: 74987

Description: This month, we're cracking the case of the With...

Steps:

  1. Opening up the scale was not an easy task – there was a lot of double-sided tape involved.
  2. The back of the scale is fastened with four Torx screws – easy enough. The entire backplate, however, is glued to the front with double-sided adhesive cushions. Removing it simply involved pulling it firmly enough to break the adhesive, but not so hard as to break the connectors. A hairdryer can help loosen the adhesive under the 4 corners.
  3. With the backplate removed, you can immediately spot 4 loads cells, one in each corner.
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  4. ARM MCU - MK22FN1M0VLL12 (NXP)
  5. weighing scale and body composition front-end IC - AFE4300 (Texas Instruments)
  6. battery charging IC (including battery protection) - BQ24095 (Texas Instruments)
  7. WiFi and Bluetooth radio - BCM43438 (Broadcom)
  8. flash memory - MX25L3233F (Macronix)
  9. op-amp - AD8544
  10. connector to the USB port PCB
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  11. I’ve made an attempt to design a block diagram for the whole setup. This won’t be 100% accurate as I don’t know all the details but it will give you an idea on how the components are interlinked and work together.
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