Specifications

38
DESIGN SPECIFICATIONS
Current Draw
Signal Signal Description VIN = 3.3V VIN = 5V
Continuous
Scan mode
Average current draw during
continuous scan mode (Note 4)
235mA 175mA
Idle
Average current draw while in idle
mode
160mA 120mA
Sleep
Average current draw while in
sleep mode
65mA 60mA
Suspend
Mode (USB)
Average current draw in USB
suspend (USB version only)
600µA 650µA
Current Waveforms
The following waveforms show typical current signature for the IS4920
(USB version) in various operating modes. Note, for all of the following
waveforms, VIN = 3.3V and the output signals Beep and Good Read are pulled
high externally through 10K resistors. Thus, these waveforms only account for
the current drawn by the IS4920 circuitry and does not show additional current
required for driving the LED or Beeper.
The IS4920 series engines do not have current limiting fuses.
Care must be taken on the host side to prevent against over current
conditions that could potential damage the host system.