AnsweredAssumed Answered

Is there an app note on using the AD9958 eval board in manual mode?

Question asked by coneill on Jun 19, 2017
Latest reply on Jun 22, 2017 by LouijieC

It would be nice to have a basic step-by-step procedure for bringing it up as far as register read/write.

 

I've done the following:

- using an NXP LPC54102 eval board SPI interface

- using the USB cable to provide power to the board

- set the jumper to 'manual'

- U2 CSB to SPI chip select

- U2 SDIO_2 to SPI MISO

- U2 SCLK to SPI SCLK

- U2 RESET to GND

- U2 IO_UPDATE toggled up/down on register write

- U2 even-numbered pin to common GND

- U13 SDIO_0 to SPI MOSI

 

I write 0xF2 to register 0 (CSR) to set it in 3-wire serial mode (4-wire SPI).

CS, SCLK and SDIO_0/MOSI data all look good.

Try to read back register 0 and get all 0's.  Same for all the other registers.

 

 

Anything else for basic register read/write?  In one thread the support tech said to pull SDIO_3 high, but on the eval board schematic it's already pulled low.

Outcomes