Lowering Average Power Consumption of TMP006

Hello Giuseppe,

The average current (and therefore average power) of the TMP006 can be reduced by placing the device in power-down mode for the majority of the time and then waking it up to take measurements.  It typically takes about four conversions (four seconds) for the TMP006 output to stabilize after exiting power-down mode due to the internal power dissipation heating the die when the device is returned to conversion mode.  The time-averaged current consumption of the device will be an integration of the current consumption while the device is converting versus the power consumption during the time that it is in power-down.

Current  while the device is converting is:  240uA
Current while the device is in power-down is 0.5uA

 Assuming the minimum time in conversion mode is 4seconds, to achieve an 80uA average current the formula to calculate time-averaged current would look like the following:

Average Current = ( (Current in Conversion Mode)*t1 + (Current inPower-Down mode)*t2) / (t1+t2)

 80uA = (240uA*4 + 0.5uA*t2) / (4+t2)

 Solving for t2 yields a little more than 8 seconds.

 So the TMP006 would wake up for 4 seconds every 8 seconds to achieve the current levels you’re trying to achieve.

Regards,
Collin Wells
Precision Analog