Honeywell IS4921 Integration Manual page 41

Signal Signal Description
VIN Operating Voltage
VIH(1) Input High (RX, CTS)
VIL(1) Input Low (RX, CTS)
VIH(2) Input High (TTL_INV, nWake)
VIL(2) Input Low (TTL_INV, nWake)
VIH(3) Input High (Trigger)
VIL(3) Input Low (Trigger)
VOH(1) Output High Voltage (TX,RTS)
VOL(1) Output Low Voltage (TX,RTS)
VOH(2) Output High Voltage (nBeeper, nGoodRead)
VOL(2) Output Low Voltage (nBeeper, nGoodRead)
VOH(3) Output High Voltage (Power down)
VOL(3) Output Low Voltage (Power down)
*** PWRDWN, nGoodRead, and nBeeper are open drain outputs w/ 100K pull-ups to VIN. Actual VOH will be
determined by the parallel resistance of the 100K pull up and any external impedance.
Signal
Continuous Average current draw during continuous
Scan mode scan mode*
Idle Average current draw while in idle mode
Sleep Average current draw while in sleep mode
Suspend Average current draw in USB suspend
Mode (USB) (USB version only)
Power Down Average current draw in power down mode
Mode (TTL) (TTL Version Only)
* Note: Continuous Scan Mode current will vary based on object size, distance, and type. The numbers listed
above are typical.
DC Operating Voltages
Current Draw @ 25°C
Signal Description
MIN MAX
3V 5.5V
2.5V
.8V
.8xVIN
.8V
.8xVIN
.25V
.8xVIN
.14xVIN
*** 5.5V
.6V
*** 5.5V
.2V
USB
VIN = 3.3V VIN = 5V
235 mA 175 mA
160 mA 120 mA
65 mA 65 mA
600 µA 650 µA
N/A N/A
Condition
Isource = 16 mA
Isink = 16 mA
Isink = 25 mA
Isink = 8 mA
TTL
VIN = 3.3V VIN = 5V
200 mA 140 mA
125 mA 85 mA
25 mA 25 mA
N/A N/A
500 µA 500 µA
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