The host cannot detect a board using CY7C65215

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EiLe_3184711
Level 1
Level 1

Hello,

I designed a board using the chip CY7C65215 based on the schematic shown in the datasheet​. I didn't use the MCU, the Battery Charger and other peripherals as the datasheet said.  When I connected the board to my PC via a USB cable, the PC cannot detect a new USB device, neighter the USB Serial Configuration Utility.

The schematic diagram is as below. Does it meet the minimum requirements for the chip to work? I had check the schematic and the PCB for a whole day, but I couldn't get any solution. Who can tell me if I miss somthing?

Thank you very much!

CY7C65215最小系统板.jpg

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1 Solution
YatheeshD_36
Moderator
Moderator
Moderator
750 replies posted 500 replies posted 250 solutions authored

Hello,

Please see my comments below:

1) Place a 0.1 uF, 16 V capacitor bypassed to ground on the VBUS line.

2) The reset pin (XRES) being an active low input pin should be pulled high and bypassed to ground.

Please refer to the screenshot attached(highlighted in red):

pastedImage_0.png

Best Regards,

Yatheesh

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1 Reply
YatheeshD_36
Moderator
Moderator
Moderator
750 replies posted 500 replies posted 250 solutions authored

Hello,

Please see my comments below:

1) Place a 0.1 uF, 16 V capacitor bypassed to ground on the VBUS line.

2) The reset pin (XRES) being an active low input pin should be pulled high and bypassed to ground.

Please refer to the screenshot attached(highlighted in red):

pastedImage_0.png

Best Regards,

Yatheesh

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