Intermec CK70 Integration Manual - page 6
6
CK70 and CK71 Back Accessory Interface (BAI) Integration Guide
Pin Descriptions
Pin
Pin Name
I/O
Description
1
OTB_PWR
Output
Provides power to the accessory.
2
GND
3
OTB_RX
Input
This signal is active when the mobile computer receives data from the accessory.
When no data is transmitted, the signal is held in the mark condition (logic ‘1’).
4
OTB_TX
Output
This signal is active when the mobile computer transmits data to the accessory.
When no data is transmitted, the signal is held in the mark condition (logic ‘1’).
5
OTB_I/O_
Voltage
Input
This signal is a reference level for the interface translator.
This signal is driven by the accessory to define the high level I/O voltage for the
interface.
6
OTB_ID
BiDir
The mobile computer uses this interface (OneWire) to identify the type of device
that is attached.
7
OTB_RTS
Output
This signal is active low to prepare the accessory to accept transmitted data
from the mobile computer.
When the accessory is ready, it asserts Clear to Send.
RTS and CTS are commonly used as handshaking signals to moderate the flow
of data into the accessory.
8
OTB_CTS
Input
This signal is active low by the accessory to inform the mobile computer that
transmission may begin.
RTS and CTS are commonly used as handshaking signals to moderate the flow
of data into the accessory.
Pin Electrical Characteristics
Pin
Minimum
Maximum
Units
1 - OTB_PWR
Voltage
3.0 V
4.5 V
V
Current capacity (including inrush)
-
200 mA
mA
Idle current (not enabled)
-
50 uA
uA
3 - OTB_RX
Input logic - high
I/O_Voltage x 0.65
I/O_Voltage
V
Input logic - low
0 V
I/O_Voltage x 0.35
V
4 - OTB_TX
Output logic - high
I/O_Voltage - 0.4
-
V
Output logic - low
-
0.4 V
V
5 - OTB_I/O_Voltage
Voltage range
1.65 V
5.5 V
V
Current consumption
-
5 uA
uA
Signals active from I/O voltage
-
12 nS
nS