13
D026227_08 CR822x Single Board Decoded Scan Engine Integration Guide
Notes:
1. Pin has a weak pull up to
V
in
.
2. If not actively controlling sleep mode, leave unconnected. Do not tie low.
4.3 – Host Interface Pinouts (CR8222 RS232)
Pin
Name
Type
Description
Note
1
RS232 Polarity
Input
RS232 polarity control. When high, all RS232 signals have their normal polarity. When
low, all RS232 signals have inverted polarity. For inverted polarity on all RS232 signals,
tie this pin to Gnd. This pin is GPIO dual function; high impedance (2k Ohm protection
impedance that can be swapped out in final design).
2
V
in
Power
Power supply voltage input
3
Gnd
Power
Power supply and signal ground
4
RxD
Input
RS232 receive data, TTL level
1
5
TxD
Output
RS232 transmit data, TTL level
1
6
CTS
Input
RS232 Clear to Send, TTL level
1
7
RTS
Output
RS232 Request to Send, TTL level
1
8
PwrDwn
Output
Power down indicator
1
9
nBeeper
Output
Feedback indicator (success, error, etc.); active low
1
10
nGoodRead
Output
Indicates a successful decode; active low
1
11
nWakeUp
Input
Bring the unit out of sleep state; active low
1,2
12
nTrigger
Input
Activate image acquisition, decode; active low
1
4.4 – Host Interface Pinouts (CR8221 USB)
Notes:
1. Pin has a weak pull up to
V
in
.
2. If not actively controlling sleep mode, leave unconnected. Do not tie low.
Pin
Name
Type
Description
Note
1
NU
N/A
Not used
2
USB_VBUS
Power
Power supply voltage input
3
Gnd
Power
Power supply and signal ground
4
D-
Bidirectional
USB D- signal
5
NU
N/A
Not used
6
D+
Bidirectional
USB D+ signal
7
NU
N/A
Not used
8
PwrDwn
Output
Power down indicator
1
9
nBeeper
Output
Feedback indicator (success, error, etc.); active low
1
10
nGoodRead
Output
Indicates a successful decode; active low
1
11
nWakeUp
Input
Bring the unit out of sleep state; active low
1,2
12
nTrigger
Input
Activate image acquisition, decode; active low
1
