Design Guide

DC Power Requirements
A DIVISION OF TRIMBLE
Hardware Overview 33
3.3 to 5.5 VDC
Less than 25 mV pk-pk ripple all frequencies,
Less than 11 mV pk-pk ripple for frequencies less than 100 kHz,
No spectral spike greater than 5 mV pk-pk in any 1 kHz band.
Idle DC Power Consumption
When not actively transmitting, the ThingMagic Nano module falls back into one of 3 idle
states, called “power modes”. There are 5 enumerated idle power modes defined in the
API, but the Nano module only supports 3 options, so three of the settings behave
identically. Each successive power mode turns off more of the moduleʼs circuits, which
have to be restored when a command is executed, imposing a slight delay. The following
table gives the power consumption levels and the delay to respond to a command for
each. See Idle DC Power Consumption
for details.
These nominal values should be used to calculate metrics such as battery life. To
determine the absolute maximum DC power that would be required under any condition,
one must consider temperature, channel of operation, and antenna return loss.
ThingMagic Nano Power Consumption
Operation
DC Power
Consumed
at 5 VDC
Time to
Respond to
a Read
Command
Power Mode = “FULL” 0.85 W Less than 5
msec
Power Mode = “MINSAVE”,
“MEDSAVE”, or “MAXSAVE”
0.04 W Less than 20
msec
Power Mode = “SLEEP” 0.02 W Less than 20
msec
ENABLE Line disabled
.00015 W Module
reboots when
Enable line
brought high