AFE20408: Getting started guide request

Hi Kazuki,

Here's a more detailed procedure. The registers themselves of course depend on how you are using the device, but here is an overview:

1) Power on the AFE20408. All DAC and OUT outputs are tied to VSS at startup, and stay at the minimum system voltage until you turn them on

2) Power on the DACs you want to use in the PWR_EN Register, 0x08. Keep PAON bit = 0 for now.
If you intend to use an "odd" DAC (DACA1, DACA3, DACB1, DACB3) for biasing or clamp, you will also need to enable the specific bit in the DRVEN register 0x13. 

3) Next, we want to configure the DACs. Set the page register to the DAC_CONFIG Page (0x01 = 0x0003)
There's a bunch of settings here such as DAC current, alarm, code limits, etc. In particular, set the OUT pin CLAMP through register 0x42. You can choose either VSS or an odd DAC for the OUT clamp.

4) Other pages you may want to go to for configuring the device:
Page 0x000: General configuration page. This page has SDO Enable, PAON configuration, and alarm configurations.
Page 0x001: ADC Configuration page. Use this page if you intend to use the ADC.

5) Once you configure everything else, you should set the DAC outputs. This can be done on the DAC Buffer Page (0x01 = 0x0004). Each DAC has a register.

6) Finally, if you are using the PAON pin, you should set PAON bit = 1 (register 0x08)

Let me know if you have any other questions.

Thanks,
Erin

Hi Kazuki,

For the power-off procedure, you'd go in reverse.

1) Set PAON bit to 0, 0x08 = 0

2) Set the DACs to your desired "off" output. This can be either fully disabling the DACs (and thus setting the output to the minimum voltage) or setting a specific voltage.

3) If desired, you can turn off the device here. You don't have to disable any of the previously set commands.

Thanks,
Erin