Noting that this product is obsolete, I have a question on this technology (rather than the chip itself). The answer would probably transfer to the newer chip (A1335?) Between 4:40-4:44, I have noticed two things. 1) There is a huge delay between rotation and its result on screen even if the first rotation belongs to first on-screen update. 2) Second pulse on screen occuring before actual motion implies it belongs to the previous rotation, which gives about 3.5 seconds delay. Product's datasheet claims 200uS refresh rate. Is it because your software is just polling extremely slow or is it because of the "significant amount of post-processing" you mention on the video?
Yes the 1335 is the appropriate successor part. And no, that delay seen in the video is not the real delay through the part. the GUI was not optimized for real-time data capture and display. The response time or latency through the A1335 is 60us with no linearization turned on. With the harmonic linearization enabled, there is additional latency that depends on the number of harmonics that are used. See Figure 22 in the app note on the A1335 page for info on the additional latency for a given number of harmonics. www.allegromicro.com/en/Design-Center/Technical-Documents/Hall-Effect-Sensor-IC-Publications/Advanced-On-Chip-Linearization-A1335-Angle-Sensor-IC.aspx
Noting that this product is obsolete, I have a question on this technology (rather than the chip itself). The answer would probably transfer to the newer chip (A1335?)
Between 4:40-4:44, I have noticed two things. 1) There is a huge delay between rotation and its result on screen even if the first rotation belongs to first on-screen update. 2) Second pulse on screen occuring before actual motion implies it belongs to the previous rotation, which gives about 3.5 seconds delay. Product's datasheet claims 200uS refresh rate.
Is it because your software is just polling extremely slow or is it because of the "significant amount of post-processing" you mention on the video?
Yes the 1335 is the appropriate successor part. And no, that delay seen in the video is not the real delay through the part. the GUI was not optimized for real-time data capture and display. The response time or latency through the A1335 is 60us with no linearization turned on. With the harmonic linearization enabled, there is additional latency that depends on the number of harmonics that are used. See Figure 22 in the app note on the A1335 page for info on the additional latency for a given number of harmonics. www.allegromicro.com/en/Design-Center/Technical-Documents/Hall-Effect-Sensor-IC-Publications/Advanced-On-Chip-Linearization-A1335-Angle-Sensor-IC.aspx