Hi, we have a task to convert Analogue DC signal (5V max) to SENT protocol. Therefore we are looking for AD converter with 2 Analogue inputs and one Digital output. Can someone advise any suitable options?
Moin, My knowledge of the SENT protocol is rather low, just what's on wikipedia - but from that, i'm pretty sure, that an attiny13a should be able to suit your needs. BUT: looks like you'll need some real-time-assembler software writing skills... Gruss WK
Servus WK, should we keep it English, so that we can add some non-English speaking guys in the discussion? =) Yes, you are right, SENT is quite rare and basically used for automotive sensor. Unfortunately, I have some basics skills of signal processing only (mainly with LabView FPGA), so real-time-assembler sounds frightening. I made a brief research on the topic, do you think something like this will suite the task? -> http://www.ti.com/product/ads8350
Moin, Looks like the ADS8350 is a dual channel ADC with SPI output. So you might use it as an Analog-to-SPI Converter, but you'll still need another chip to convert SPI to SENT. So this other chip would have to do the "hard part" (the SENT timing, framing, calculation of checksums, communication via SPI, etc). Depending on your real needs, the ADS8350 might be even a little bit to much - do you really need 16bit resolution at 750kSamples/sec with simultaneous sampling? Usually people asking for advice just believe they'd urgently need the 16bit resolution. But developing hardware to use the full 16bit range is not at all a simple task. Layout recommendation in the datasheet is not just because of the colorful pictures... En plus: are you able to solder the itsy bitsy tiny 3x3mm 16pin package with the exposed thermal pad? Gruss WK
Hello, usually SENT has 2 (main) channels with 12 Bit values so no need to use a 16 Bit ADC. A ATTINY with 10 Bit ADC might be also not suitable. Typical frame rate is around 1ms for the complete frame. So a few kS/s will be sufficient. I would use a PIC24FV32KA301/PIC16F184XX or similar with 12 Bit ADC for this. regards Anja