Datasheet HBCC-0500 Datasheet (HP)

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

Recommended Schematic

Shown is the recommended
schematic for the HBCC-0500.
Here are some construction tips.

1. Place the sensor, 2N4403, bin

resistor, and the 0.47 µF cap
close to each other to minimize
loop area.

2. If the 0.47 µF cap is tantalum,

its ESR must be used in series
with Rb to determine the
correct value for Rb.

3. A 1.0 µF ceramic cap may be
used in place of the 0.47 µF
cap.

4. Place the 0.22 µF cap attached
to pins 4 and 23 close to the
IC.

5. Use a single point ground close
to pin 23.

Options

There are four options on the
recommended schematic.

1. Output pull up resistor

2. Inverted output

3. Black state return

4. Threshold adjust

Pull Up Resistor

The 10 kΩ pull up resistor on the
standard or inverted output
transistor is optional. If the
transistor is driving a cable, the
resistor should be on the far end
of the cable.

Schematic

2N4403

LED ANODE

LED CATHODE

DETECTOR

CATHODE

DETECTOR

ANODE

SENSOR

Rb Ω

6
2

1



8

0.47
µF

+5 V

+5 V

680 KΩ

39 Ω39 Ω

0.22µF0.22

8.2 nF

470 KΩ

9.1 KΩ

6.8 MΩ

µF

2N5088

75 pF

0.1 µF

24

LEDD

4

V

CC

23

GND

15

PSTI

7

PREO

6

EMIN

5

AGND

1

RPER

2

RPWD

3

CTIM

9

PPKD

1 nF 1 nF

HBCC-

0500

CTHR

18

1N4148

CMPO

CMPI

LPFO

AMDT

CMPA
ACMP

IWSR
V

PRBP

PSTB

NPKD

390 KΩ470 KΩ

LPFI

CC

19
17

22

13

21
14
12

20
8

A

10
11
16

2.0 MΩ
20 KΩ

680 pF

56 KΩ 56 KΩ

2.2 nF

330 pF

12 pF

NC

0.22 µF

0.1 µF

0.1 µF

0.1 µF

1.3 MΩ

+5 V

10 KΩ (OPTIONAL)

20 KΩ

2N3904

+5 V

10 KΩ
(OPTIONAL)

INVERTED OUTPUT

(OPTIONAL)

+5 V

3.3 nF

1.0 MΩ

220 KΩ

2N5088

2.0 MΩ

BLACK STATE RETURN

(OPTIONAL)

1.0 pF

1N4148

OUTPUT

INVERTED
OUTPUT

4-35

Inverted Output

The standard output of the
HBCC-0500 is high when the
sensor is looking at black bars,

increase the values of the 1.0 µF
and the 3.3 nF caps. The ratio of
values should be no more than
300:1.

and low when the sensor is look­ing at white spaces. If inverted
output is needed, add the extra
circuitry in the inverted output
block. Make sure that the 10 kΩ
pull up resistor on the normal
output transistor is loaded.

Threshold Adjustment

The standard circuit uses a
threshold designed for most bar
codes. If the bar codes to be read
consistently have narrow bars
that are lighter than the wide
bars, then the 470 kΩ and the

Black State Return

The HBCC-0500 normally returns

390 kΩ resistors attached to pin
18 should be swapped.

to the white state 100 millisec­onds after the last transition. The
extra circuitry forces the black
state after a time out period set
by the 1.0 µF cap. The normal
time out period is about 1.5 sec­onds. If a longer time is needed,

Warranty and Service

HP Digitizer ICs are warranted
for a period of one year after
purchase covering defects in
material and workmanship.
Hewlett-Packard will repair or, at

Recommended Operating Conditions

Parameter Min. Max. Units Notes

Scan Velocity 7.6 (3) 76 (30) cm/sec (in/sec) 1
Edge Contrast 40 % 2
V

CC

Ambient Temperature -20 +65 °C
Ambient Light 100,000 Lux

Notes:

1. Narrow element width = 0.19 mm (0.0075 in.).

2. Contrast is defined as Rw - Rb, where Rw is the reflectance of the spaces in Rb is the
reflectance of the bars, measured at the sensor wavelength (655 or 820 nm). 100%
reflectance is barium sulfate.

3. Power supply ripple and noise should be less than 100 mV peak to peak.

4.5 6.0 V 3

its option, replace products that
prove to be defective in material
or workmanship under proper
use during the warranty period.

NO OTHER WARRANTIES ARE
EXPRESSED OR IMPLIED,
INCLUDING BUT NOT LIMITED
TO THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR
PURPOSE. HEWLETT-PACKARD
IS NOT LIABLE FOR
CONSEQUENTIAL DAMAGES.

For additional warranty or service
information, please contact your
local Hewlett-Packard sales
representative or authorized
distributor.

Electrical Characteristics

Parameter Symbol Typical Max. Units Notes

Supply Current, IC and Sensor I
High Level Output Current I
Low Level Output Voltage V
Output Rise Time t
Output Fall Time t
Wake Up Time t

Notes:

4. Rise and fall time will be dependent upon the capacitance of the cable.

5. Wake up time is defined as the time from initial power turn on until the circuit is
digitizing bar codes within data sheet limits.

4-36

CC

OH

OL

r

f

w

2.7 4.0 mA

1.0 µA

0.4 V

4.5 20 µs4

0.3 20 µs4

50 200 ms 5