IPS2200 not working

Question

I am having issue with the IPS2200 board. I have my circuit board made and trying to test the encoder with no success. I know I have to spec CT1 and CT2 capacitors using the formula provided. The formula needs to have a value for L but I am not sure how to get the value? 
 I used the ICD tool from Renesas to create the coil and nowhere it says the value of coil inductance. 
 When I power up the board and spin the target board, there is no Sin or Cosine waves. 
 See below for board drawing and pdf schematic.

[No Variations].PDF 
 Thanks 
 Armando

raja · Answer

Hi Armando, 
 Thanks for the patience. Sorry for the long reply. Please see the response from factory apps teams: 
 This design has multiple issues. Have you tried to program the IC with basic settings. On the top we do not know the PCB stack nor the layout etc. Connections are very far apart. 
 
 You must open the coil and ideally put them as close as possible. 
 
 Additional comments: 
 You should cover the hole the Top Layer and Inner 1 Layer completely in copper, otherwise you will have linearity issues. 
 For further clarification please go through the following links: 
 https://www.renesas.com/us/en/document/ppt/inductive-position-sensor-design-guidelines?r=1469886 
 So, we would suggest that please go through the points and notes carefully. If problem persists so, please create ticket for better level support (one to one).

Regards: 
 Raja.

raja · Answer

Hi Armando, 
 Thanks for the response. You can submit a ticket. Please click on the below link: 
 https://en-support.renesas.com/dashboard 
 Note: You will need to sign in, and if you don't have an account you will need to register. https://www.renesas.com/register

Regards: 
 Raja.

raja · Answer

Hi Armando, 
 Thanks for the update. The Inductance value (Ltx) can be estimated by ICOT tool or measured directly on the PCB (LC meter). The Iductance value should lie in the range of 1.5uH to 30uH (for best practice). 
 Regards: 
 Raja.

raja · Answer

Hi Armando, 
 You can also use single Capactior (Ctx) but to better cope with EMC we would suggest use differential capacitor Ctx1 and Ctx2 and the value should be double with respect to common mode capacitor (Ctx). For more information, please go through the application module documents: 
 https://www.renesas.com/us/en/document/oth/ips2200-application-module-document?r=658471

This tool is not available for publicly. When we design the customer specific coil, then our system software will calculate inductance value. 
 If possible, please provide the end application of your project, LTV so that we would better understand your situation and provide better support. 
 Regards: 
 Raja

IPS2200 not working

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