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Avg rating: 100
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Lamb
- MAX6674 Update Rate
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2009-06-11 |
This product is very easy to use and takes a lot of the work out of hooking up thermocouples, but has two problems I have found:
1) The update rate is not published - you need to poll the thing slower than about 150ms for the output to update. I don't think that's in the data.
2) The output data format is a bit backwards - if you need to clock out 16 bits, the data should be in the low 11 bits and the 'junk' should be at the top. The way it is, you are supposed to clock out unused bits at the end and then shift your data to make sense of it. You can however, just clock out the first 11 bits...
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MS
- Re: MAX6674 Update Rate
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(no rating)
2009-06-16 |
Thank you for your comments.
1. The conversion rate is listed as 0.18 second in the data sheet. As soon as one conversion is complete, the next one starts, so you can assume a maximum update rate of 180ms.
2)This is a valid concern. Virtually every digital temperature sensor on the market places the data in the higher bits, and we normally follow this “convention”.
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