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The AD7682/AD7689 are 4-channel/8-channel, 16-bit, charge redistribution successive approximation register (SAR) analog-to-digital converters (ADCs) that...
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How to share one SPI with other chips on AD7689

LIAOXIAOJUN on Dec 2, 2025

Category: Software

Product Number: AD7689

How to share one SPI with other chips on AD7689？We found that when using the shared SPI, the CNV pin of the AD7689 is always in a high-impedance state, but the shared data output pin will be interrupted by the AD7689.

LIAOXIAOJUN on Dec 2, 2025 3:35 AM
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The CNV pin is always pulled to 3.3V.
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NathanT

on Dec 3, 2025 12:29 AM
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Hi, LIAOXIAOJUN .

I want to further understand your setup. Can you share a block diagram or schematic of your setup? Also, explaining the sharing of SPI line and a scope shot is also appreciated.

Thanks and regards,
Jo
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How to share one SPI with other chips on AD7689

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