AFE639D2: AFE with temperature sensor TMP1075

There is an idea to set the alarm output of the temperature sensor to a certain temperature, after which the semiconductor UV laser is turned on. Along the way, another question arose - after setting up IC AFE, is it possible to read the IC AFE639 status registers in parallel via the I2C bus?

I plan to use this crystal in conjunction with the buck-bost converter TPS552882

Hi Andrei, 

It looks like the TPS552882 should work fine. Similar to the application circuit in the datasheet, you would connect the voltage output of the AFE to the FB network of the TPS552882:

You should be able to use the TMP1075. Keep in mind that the AFE only sends one piece of data to the configuration register, so make sure that is sufficient to set up the TMP1075. 

No, you should not read from the AFE at the same time the AFE is reading data from the TMP1075. You can toggle the MODE pin low during operation to stop the AFE from reading from the TMP1075 and then use your host to read from the AFE. But in that case, the AFE would think it is reading back 0 data from the TMP1075 and the output would respond accordingly. The AFE is meant to run standalone with the external temp sensor/ADC and buck/boost converter. 

Best, 

Katlynne Jones 

Hi Katlynne,

In case of using an Analog Sensor and IC AFE539A4, is it possible to read internal data during operation?

Hi Andrei,

Katlynne will respond back on 5th Sep as we have a holiday today.

Regards,

AK

Hi Andrei, 

It is possible to update the setpoint and common mode in the dynamic address locations, but there is not access to any other internal data. 

Best,

Katlynne Jones