TMP441

Murali,

Question:

If an n-Factor of let’s say 1.05 is needed how do you determine the corresponding binary value to program the register?

Answer:

Using equation 3 above plug in n_EFF = 1.05

N_ADJUST = 300 – 300*1.008/1.05 = 12

12 = 0xC = 1100

Programming the register to 0000 1100 will provide the desired result of n_EFF = 1.05.

I will look into your second question and get back to you shortly.

Murali,

Yes auto beta correction is applicable to a diode connected sensor. 

On page 14 of the datasheet you will find the following:

"If the Beta compensation Configuration Register is set to '1xxx' (beta compensation enabled) for a given channel at the beginning of each temperature conversion the TMP441/42 automatically detects if the sensor is diode-connected or GND collector connected, selects the proper beta range, and measures the sensor temperature appropriately."

You will see in Table 8 that setting the value to '1xxx' in the Beta Compensation Register corresponds to the automatic detection while setting the value to '0xxx' not including 0111 corresponds to manual selection. 

Murali,

In Figure 9 you will see that the remote temperature error vs capacitance is shown for a diode connected transistor. The plot for this applies to auto (enabled) and disabled. 

Hi Chris,

Thanks a lot for your immediate response.

Now, I have clarity on the same.

Best Reagrds,

Murali