LMT70A: Suggestion for temeperature monitoring wearable band

Hi Abhishek,

Below is my feedback.

1) Does TI has any design for same/ Similar application?

Please see this FAQ for design information on this topic. e2e.ti.com/.../895494

2) Please suggest which part we should proceed as we have to make very cheap band

For 0.1 °C applications I would suggest either TMP117 or LMT70.

3) We are thinking of mounting a metal part/ thick pogo pin on bottom side PCB in such a manner that it come out of mechanical surface and tough skin. Do you have any suggestion for such part ? Does TI used any such part off the shelf part in there internal testing while making probe of any wearable heart rate monitor/ECG, if so please suggest part no

Please see these reference designs for reference:    

4) while going through www.ti.com/.../snia021b.pdf on page no 4 it is mentioned that "Better results can be obtained if underfill material is added surrounding the LMT70 die (package) as shown in Figure 4." Can you please tell any example of material which can be used ?

Let me check to see what underfill material was used in that app note.

5) We have one concern that suppose user didn't tied his wearable we may not able to measure temp properly . Do you have any suggestion how we can give notification that probe not properly touching hand ?

we are thinking of proximity sensor( not sure about sensitivity) and SPO2 sensor (disadvantage is high current consumption and cost ).

You could try using TI CapTIvate technologies for low power contact detection: 6) How sweat under the probe can impact temperature measurement. Consider use case person is in 40 degree ambient and we need to measure temperature every 30 min.

Sweat will have a different thermal conductivity than your skin, but as long as there is a good thermal path from the wrist to the temperature sensor and the temperature sensor is not exposed to sweat directly there shouldn't be any concerns.