12
C005383_10 CR80XX Integration Guide
4.2 – Electrical System Block Diagram
4.1 – System Requirements
4 - Electrical Specifications
The CR8000 Decoded Scan Engine is a complete barcode scanning
system that can be easily integrated into any device.
The block diagram below shows the main components of the system
(CR8011/8012).
Power Supply:
The CR8000 is powered from the host via the
V
in
and Gnd
pins.
V
in
must be within the range specified in Section 4.15 when measured
at the decoding board.
V
in
must be maintained with varying loads, such as
when the illumination is turned ON and OFF.
Host Ribbon Cable (FFC) (CR8011 and CR8012):
The impedance of
the cable for the USB data lines should be 90 ohm differential. For 3.3V
operation, a Ribbon Cable of no more than 6.0" in length can be used with a
0.28 mm (0.011") trace width and 0.3 mm trace thickness.
Scan Engine to Decode Board Flex Cable (FPC):
When leveraging a
non-bracketed design, care should be taken to alleviate bend stress on the
Flex Cable, which could lead to damage of that cable. The minimum bend
radius for this cable is 2.0 mm. Drawings can be provided upon request to
aid in design. Flex Cable length should not exceed 6.0".
Power Sequencing:
There is no special power sequence needed for the
CR8000 as long as the max and min voltage and current specifications are
met. However, if the voltage on a pin is greater than
V
in
, such as
when powering on, then current will flow from the pin to
V
in
through
the pull up resistors.
Thermal Requirements:
The operating temperature range for the CR8000 is
-20ºC to 55 ºC (-4ºF to 131ºF) ambient air.
DECODE
PCBA
FLEX CABLE
RIBBON CABLE (RS232/USB)
NU = Not Used on USB Model
Power
Illum. Control
TXD/NU
CTS/USB D+
RTS/NU
PwrDwn
nBeeper
nGoodRead
nWakeUp
nTrigger
RXD/USB D-
GND
V
IN
RS232 Polarit/NU
I2C Bus
Image Control
Image Data
OPTICAL
ENGINE
