HP HBCC-0500 Datasheet

Low Current Bar Code
Digitizer IC

Technical Data

H

HBCC-0500

Features

• Compatible with HP Bar
Code Sensors

– HBCC-1570 - 0.013 in.

0.33 mm

- HBCC-1580 - 0.007 in.

0.185 mm

- HBCC-1590 - 0.005 in.

0.13 mm

• Ambient Light Rejection
> 100 K Lux

• Accurate Digitizing of a
Wide Range of Bar Code
Labels

Description

The Hewlett-Packard Low Current
Bar Code Digitizer IC allows
designers to incorporate the high
ambient light rejection and low
power consumption features of
the HBCS-AXXX/TXXX wands
into their own bar code circuitry.
The HBCC-0500 is packaged in a
24 pin SOIC plastic package.

output of different sensor “bins”
is equalized by varying the
amplitude of the LED drive
current.

The sensor output has two com­ponents; DC due to ambient light,
and AC from the bar code label.
Photocurrent from the sensor is
amplified and high pass filtered
to remove the ambient light
signal. The AC component is
amplified and sent to an AM
detector to recover the bar code
information. The recovered bar
code signal is low pass filtered to
eliminate the 30 kHz carrier. The
signal is input to a digitizer
consisting of positive and negative

Block Diagram

SENSOR LED DRIVER

peak detectors and a comparator.
The comparator threshold is
generated from the peak
detectors using a resistor ladder.
This threshold, along with the
current bar code signal, is input
to a comparator. The output of
the comparator drives an external
output transistor.

Theory of Operation

The digitizer IC uses the tech­niques in US Patent 4,682,015 to
reduce power consumption and
sensitivity to ambient light.
Power is reduced by pulsing the
LED every 33 microseconds with
a 1 microsecond pulse. The

5964-1563E

AM

DETECTOR

AMPLIFIER

LOW PASS

FILTER

HIGH PASS

FILTER

DIGITIZER

AMPLIFIER

OUTPUT

4-33

Pinout

RPER 1

RPWD 2

CTIM 3

V

CC

AGND 5

EMIN 6

PREO 7

A8

V

CC

PPKD 9
PRBP 10

PSTB 11

ACMP 12

4

HBCC-0500

24

LEDD

23

GND

22

LPFO

21

LPFI

20

IWSR

19

CMPO

18

CTHR

17

CMPI

16

NPKD

15

PSTI

14

CMPA

13

AMDT

Sensor Pinout

1 7

2 6

3 5

TOP VIEW

Function Pin #

LED Anode 6
LED Cathode 2
Detector Anode 8
Detector Cathode 1

Pin Description

Mnemonic Description

RPER Timer Period
RPWD Timer Pulse Width
CTIM Timer Capacitor
V

CC

Filtered Power
AGND Analog Ground
EMIN Preamp Emitter Input
PREO Preamp Output
VCCA Analog Power
PPKD Positive Peak Detector
PRBP Preamp Bias Point
PSTB Postamp Bypass
ACMP Compensation Cap
AMDT AM Detector
CMPA Compensation Cap
PSTI Postamp Input
NPKD Negative Peak Detector
CMPI Comparator Input
CTHR Comparator Threshold
CMPO Comparator Output
IWSR White State Return Current
LPFI Low Pass Filter Input
LPFO Low Pass Filter Output
GND Ground
LEDD LED Drive

Bin Table

Bin # 1570, 1580 Rb Ω 1590 Rb Ω

1 8.2 22
21127
31536
41847
52456
63075
73691

Sensor Marking

Sensors are marked with an eight

8

digit code, the last digit being the
“bin” number. The bin number is
used to determine the bin
resistor, Rb, using the Bin Table.

4

Parts List

Quantity Part

1 Sensor
1 HBCC-0500

1 1N4148
1 2N3904

1 2N4403
1 2N5088

2 39 Ω
1 9.1 kΩ
2 20 kΩ
2 56 kΩ
1 390 kΩ
2 470 kΩ
1 680 kΩ
1 1.3 MΩ
1 2.0 MΩ
2 6.8 MΩ
1 Bin resistor R

b

1 12 pF
1 75 pF
1 330 pF
1 680 pF
2 1.0 nF
1 2.2 nF
1 8.2 nF
4 0.1 µF
3 0.22 µF
1 0.47 µF

Optional Parts List

Quantity Part

1 1N4148
1 2N5088

1 2N3904
2 10 kΩ

1 220 kΩ
1 1.0 MΩ
1 2.0 MΩ

1 3.3 nF
1 1.0 µF

4-34