View HBCC-0500_605060.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

H
Low Current Bar Code Digitizer IC Technical Data
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
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
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.
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.
Block Diagram
SENSOR LED DRIVER
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
AMPLIFIER
HIGH PASS FILTER
AMPLIFIER
AM DETECTOR
LOW PASS FILTER
DIGITIZER
OUTPUT
5964-1563E
4-33
Pinout
RPER RPWD CTIM VCC AGND EMIN PREO VCCA PPKD PRBP PSTB ACMP 1 2 3 4 5 6 7 8 9 10 11 12 HBCC-0500 24 23 22 21 20 19 18 17 16 15 14 13 LEDD GND LPFO LPFI IWSR CMPO CTHR CMPI NPKD PSTI CMPA AMDT
Sensor Pinout
8 1 2 3 4 TOP VIEW 5 7 6
Sensor Marking
Sensors are marked with an eight digit code, the last digit being the "bin" number. The bin number is used to determine the bin resistor, Rb, using the Bin Table.
Parts List
Pin # 6 2 8 1 Quantity 1 1 1 1 1 1 2 1 2 2 1 2 1 1 1 2 1 1 1 1 1 2 1 1 4 3 1 Part Sensor HBCC-0500 1N4148 2N3904 2N4403 2N5088 39 9.1 k 20 k 56 k 390 k 470 k 680 k 1.3 M 2.0 M 6.8 M Bin resistor Rb 12 pF 75 pF 330 pF 680 pF 1.0 nF 2.2 nF 8.2 nF 0.1 F 0.22 F 0.47 F
Function LED Anode LED Cathode Detector Anode Detector Cathode
Pin Description
Mnemonic RPER RPWD CTIM VCC AGND EMIN PREO VCCA PPKD PRBP PSTB ACMP AMDT CMPA PSTI NPKD CMPI CTHR CMPO IWSR LPFI LPFO GND LEDD Description Timer Period Timer Pulse Width Timer Capacitor Filtered Power Analog Ground Preamp Emitter Input Preamp Output Analog Power Positive Peak Detector Preamp Bias Point Postamp Bypass Compensation Cap AM Detector Compensation Cap Postamp Input Negative Peak Detector Comparator Input Comparator Threshold Comparator Output White State Return Current Low Pass Filter Input Low Pass Filter Output Ground LED Drive
Optional Parts List
Quantity 1 1 1 2 1 1 1 1 1 Part 1N4148 2N5088 2N3904 10 k 220 k 1.0 M 2.0 M 3.3 nF 1.0 F
Bin Table
Bin # 1 2 3 4 5 6 7 4-34 1570, 1580 Rb 8.2 11 15 18 24 30 36 1590 Rb 22 27 36 47 56 75 91
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 F cap close to each other to minimize loop area. 2. If the 0.47 F cap is tantalum, its ESR must be used in series with Rb to determine the correct value for Rb.
3. A 1.0 F ceramic cap may be used in place of the 0.47 F cap. 4. Place the 0.22 F 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 k 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
+5 V 10 K (OPTIONAL) OUTPUT CMPO 19 CMPI 17 LPFO 22 AMDT 13 56 K 2.0 M 20 K 680 pF 56 K +5 V 10 K (OPTIONAL) INVERTED OUTPUT INVERTED OUTPUT (OPTIONAL) +5 V 3.3 nF 1.0 M 220 K 2N5088 2.0 M 1.3 M 1.0 pF 1N4148 20 K 2N3904 24 LEDD 39 0.22 F 4V CC 0.22 F 23 GND
Rb 39 2N4403 LED ANODE 6 LED CATHODE 2 0.47 F
+5 V
8.2 nF DETECTOR CATHODE 1 8 DETECTOR ANODE SENSOR 680 K
15 7 6 2N5088 5
470 K 9.1 K
PSTI 21 PREO HBCC- LPFI 0500 EMIN CMPA 14 ACMP 12 AGND IWSR 20 1 RPER V A8
CC
2.2 nF 330 pF
12 pF NC 0.22 F 0.1 F 0.1 F 0.1 F
2 RPWD 75 pF 3 CTIM 0.1 F 9 PPKD
PRBP 10 PSTB 11
+5 V
6.8 M
16 CTHR NPKD 18 390 K 470 K 1 nF 1N4148 1 nF
BLACK STATE RETURN (OPTIONAL)
4-35
Inverted Output
The standard output of the HBCC-0500 is high when the sensor is looking at black bars, 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 k pull up resistor on the normal output transistor is loaded.
increase the values of the 1.0 F and the 3.3 nF caps. The ratio of values should be no more than 300:1.
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.
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 k and the 390 k resistors attached to pin 18 should be swapped.
Black State Return
The HBCC-0500 normally returns 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 F 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 Scan Velocity Edge Contrast VCC Ambient Temperature Ambient Light Min. 7.6 (3) 40 4.5 -20 Max. 76 (30) 6.0 +65 100,000 Units cm/sec (in/sec) % V C Lux Notes 1 2 3
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.
Electrical Characteristics
Parameter Symbol Typical Supply Current, IC and Sensor ICC 2.7 High Level Output Current IOH Low Level Output Voltage VOL Output Rise Time tr 4.5 Output Fall Time tf 0.3 Wake Up Time tw 50 Max. 4.0 1.0 0.4 20 20 200 Units mA A V s s ms Notes
4 4 5
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

▲Up To Search▲

Price & Availability of HBCC-0500

	To Download HBCC-0500 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .