AnsweredAssumed Answered

VF3x reset, serial bootload

Question asked by Mehmet Ali Ipin on Aug 27, 2013
Latest reply on Apr 10, 2015 by Daniel Basilio

I am trying to have our VF3x to reset and accept the 0x23454523 command from the serial channel and transmit back to the terminal.

I measured:



  • 3.25 Volt on VBAT pin
  • 3.3 Volt on VDD_LDOIN ( about 100 milihundred volt noise)
  • 1.13 Volt on DCAP_V11_LDO_OUT
  • 2.52 Volt on DCAP_V25_LDO_OUT
  • 3.3 Volt on VDD33
  • 3.3 Volt on VDDREG
  • 1.2 Volt on VDD
  • 5.2 Volt on USB_VBUS
  • 3.1 Volt on USB_DCAP
  • 1.8 Volt on VBCTRL

23.99 MHz on XTAL-EXTAL pins ( XTAL pin has perfect sine wave, while EXTAL pin has a periodic signal between sine wave and triangle wave)

There are a 2.2 MOhm parallel resistor in ref design for XTAL pins' series capacitor. Why it is used?

The PCB draws 86 mAmperes from 3.3 Volt supply.



My RCON Mappings are adjusted for serial boot loader from UART 0. But I could not get answer to 0x23454523 message.



Do these voltage values and osc. value proof that chip has reset?



What else I could check?