Suggest multimeter IC for MCU controlled DMM module - Page 1
Forum section: electronics / projects

author: Unixon
author_rank: Frequent Contributor
timestamp: November 12, 2020, 12:30:55 pm
content: I'm looking for a single IC (or a small IC set) solution for DMM that could be entirely controlled from MCU via SPI/I2C or another digital interface.Autonomous operation with display/keyboard/etc is not required, analog to digital frontend only type of solution is preferred.Desired precision in resistance/voltage/current modes 0.1% or better, 20-50k counts full scale or better.Autoranging is appreciated, the more quantities it can measure the better.Just throw here whatever you think fits the description.

author: Benta
author_rank: Super Contributor
timestamp: November 12, 2020, 04:37:46 pm
content: Something like the Microchip TC500/510 perhaps?

author: Unixon
author_rank: Frequent Contributor
timestamp: November 12, 2020, 05:36:52 pm
content: Quote from: Benta on November 12, 2020, 04:37:46 pmDo you know projects made with these?

author: Benta
author_rank: Super Contributor
timestamp: November 12, 2020, 06:03:08 pm
content: No. But it seems to do what you want.

author: Unixon
author_rank: Frequent Contributor
timestamp: November 12, 2020, 06:35:50 pm
content: Quote from: Benta on November 12, 2020, 06:03:08 pmTC500 is a good hint, but it doesn't do full job.What I want from that thing is to handle all measurement by itself, so I could tell it what to measure by writing some registers and to get measurement result by reading other registers. Just imagine replacing DMM display and all of keys / switches with an SPI port. Of course, input protection and sensing elements and all passive stuff has to be made with external components.

author: Unixon
author_rank: Frequent Contributor
timestamp: November 12, 2020, 07:40:12 pm
content: Looks like HY313x fits better, but I have to read datasheets with more attention to details.See alsohttps://store.digilentinc.com/dmm-shield-7-function-digital-multimeter-shield/

author: Unixon
author_rank: Frequent Contributor
timestamp: November 12, 2020, 07:51:38 pm
content: Hmm...https://sigrok.org/wiki/EEVBlog_121GW

author: Kleinstein
author_rank: Super Contributor
timestamp: November 12, 2020, 07:53:27 pm
content: The TC500/TC510 are really old ones, with not much more than an ADC and input buffer.The HY313x are a lot more modern, more like modern DMMs.

author: Inari
author_rank: Contributor
timestamp: May 09, 2021, 04:49:47 pm
content: Sorry to revive the old topic, but it's probably not good to start a new. I remember once a few years ago I saw an Application Note talking about a TC500A application in a simple 5 digit (if I am correct 79999 count) DC voltmeter with serial out (Arduino maybe read it and display for LCD?) and some time now i have tried to find this material but it seems that it is no longer available on the internetHas anyone may have come across a possible Application Note here and maybe can guide me to find this? I have Microchip TC500ACOE part and I need only simple "panel voltmeter", if this 79999 count is right what I remeber, then this would meet my needs.I need it to increase my simple milliohmmeter range.

author: prasimix
author_rank: Unknown
timestamp: May 09, 2021, 05:21:57 pm
content: Quote from: Unixon on November 12, 2020, 07:40:12 pmLast time when I was in contact with them the MOQ was 1000 pcs.

author: coromonadalix
author_rank: Super Contributor
timestamp: May 09, 2021, 05:26:10 pm
content: https://www.digikey.ca/en/products/detail/digilent-inc/410-356/9916324surely you could find some code snipets schematics ??The TC500 could be interfaced to an lpt port too ... and its not expensive +/- 6$ usd ??