# 4 mcp9600 thermocouple amplifier on single channel

**URL:** <https://forums.pimoroni.com/t/4-mcp9600-thermocouple-amplifier-on-single-channel/13721>\
**Category:** Support\
**Created:** [April 30, 2020, 3:09pm UTC](https://forums.pimoroni.com/t/4-mcp9600-thermocouple-amplifier-on-single-channel/13721 "2020-04-30T15:09:02Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![kelster101757](https://avatars.discourse-cdn.com/v4/letter/k/eb8c5e/32.png) [@kelster101757](https://forums.pimoroni.com/u/kelster101757)\
**Post date:** [April 30, 2020, 3:09pm UTC](https://forums.pimoroni.com/t/4-mcp9600-thermocouple-amplifier-on-single-channel/13721/1 "2020-04-30T15:09:02Z")

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Do you know if the mcp9600 thermocouple amplifier chips can be configured to have 4 I2c addresses? The datasheet says it can but the web address says only 2. If so, how?

> **[MCP9600 Thermocouple Amplifier Breakout – Pimoroni Store](https://shop.pimoroni.com/products/mcp9600-thermocouple-amplifier-breakout#show-reviews)**
>
> This top-of-the-range MCP9600 thermocouple amplifier breakout works with eight different thermocouple types, has built-in temperature alerts, is compatible with Raspberry Pi, Arduino, and with our no-solder Breakout Garden HAT.

Much appreciated.

Thanks

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**Author:** ![Shoe](https://avatars.discourse-cdn.com/v4/letter/s/e36b37/32.png) [@Shoe](https://forums.pimoroni.com/u/Shoe)\
**Post date:** [April 30, 2020, 3:22pm UTC](https://forums.pimoroni.com/t/4-mcp9600-thermocouple-amplifier-on-single-channel/13721/2 "2020-04-30T15:22:46Z")

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The datasheet says it can have one of several addresses if you use resistors to change the voltage flowing into a pin on the chip (interesting, I’ve never seen that method before). The Pimoroni breakout only has a pad which can be cut, so you’d have to do some additional electronic work to make that happen, possibly by removing and replacing the tiny little resistors on the breakout board.

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**Author:** ![kelster101757](https://avatars.discourse-cdn.com/v4/letter/k/eb8c5e/32.png) [@kelster101757](https://forums.pimoroni.com/u/kelster101757)\
**Post date:** [April 30, 2020, 3:32pm UTC](https://forums.pimoroni.com/t/4-mcp9600-thermocouple-amplifier-on-single-channel/13721/3 "2020-04-30T15:32:16Z")

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maybe sticking a resister over the pad. interesting to find out, i want to pull the trigger on the purchase but need to wait for a definite answer first.

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<div class="post-metadata">

**Author:** ![Shoe](https://avatars.discourse-cdn.com/v4/letter/s/e36b37/32.png) [@Shoe](https://forums.pimoroni.com/u/Shoe)\
**Post date:** [April 30, 2020, 4:34pm UTC](https://forums.pimoroni.com/t/4-mcp9600-thermocouple-amplifier-on-single-channel/13721/4 "2020-04-30T16:34:12Z")

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At a guess, power already flows through the pad (giving it i2c address 0x67), but if you cut the pad power is forced to flow through the resistors, giving it i2c address 0x66. If that’s the case then from the datasheet I think you’d have to actually cut the pad and then _reduce_ the resistance across the selection resistor, not increase it.