Honeywell International Inc. IM11PRT Manuale Utente

The module handles its own power management and goes into 
Standby mode automatically when there are no outstanding 
commands. However, even in Standby mode, the IM11 immediately 
responds to host activity, eliminating any potential host timeout 
conditions. 

To achieve an even lower power Standby mode, the host needs to 
support USB suspend and remote wakeup. 

To reduce power, the module duty cycles its transmitter. The duty 
cycling happens according to the read commands that the application 
executes. To achieve the lowest power, after all tags are read, the 
transmitter turns off. After a period of time, the transmitter activates 
to identify new tags in the field. After all new tags are read, the 
transmitter turns off for the rest of the period.

Also, the module automatically reduces the power out if the input 
voltage is too low or the temperature of the module is too high.

For more information about low power read commands, see the 

.

There are four different power states for the RFID module.

Power State

Level of Consumption

Off

0 (3.3 V turned off to the module)

Deep Sleep

3.3 V on

RF enable = Off

< 1 mA 

Real Time Clock (RTC) = On (< 100 μA to power RTC)*

Enable (Pin 20) is low 

Idle

3.3 V on

RF enable = On

No USB activity 

About 35 mA

Enable (Pin 20) is high

Read

Max current during tag read about 1.5 A