KF2004-GF50A Printheads Compact low voltage thick film thermal printhead (8dots / mm) KF2004-GF50A A world first, ROHM offers the KF2004-GF50A of thermal printheads that allow operation using a single standard lithium ion battery: required voltage has been reduced to just 2.7V. Compact and lightweight they are ideal printheads for handheld printers and PDAs (personal digital assistants). !Applications Mobile printers FET-POS printers Hand-held printers Debit printers !Features 1) Using advanced LSI technology, ROHM has developed a dedicated low voltage driver chip. Compared with previous products, power consumption has been reduced by more than 30%. Because the print head circuits draw just 2.7 volts, the printer can be driven using a single lithium ion battery. 2) One rank resistance value of 123Ω ± 4% eliminates the inconvenience of rank selection. 3) The GP10 series has a resistance value of 123Ω and can be used in devices designed to operate with a single 3V lithium ion battery. !External dimensions (Units : mm) Dot #832 (1.1) Dot #1 (11.35) Max.1.7 Exposed Conductor Side No.1 M No.28 ax .φ 14 . 0 (14) 2.1±0.3 MAX.16.5 117 104 (Effective Print Width) Insert Direction Connector 1/4 KF2004-GF50A Printheads !Equivalent circuit VH L-GND P-GND STB7 STB6 STB2 STB1 AEO2 AEO1 LAT DI CLK DO VDD TM TM DOT #832 1,2,3,26,27,28 DOT #1 18 13,14,15,16,17 13 12 11 3 2 1 24 23 9 8 20 19 5 LATCH REGISTER 25 SHIFT REGISTER 6 4 7 THERMISTOR 30kΩ B:3950 11 12 Fig.1 !Pin assignments No. Circuit No. Circuit 1 VH 15 P-GND 2 VH 16 P-GND 3 VH 17 P-GND 4 L-GND DO 18 5 LAT 19 AEO1 6 CLK 20 AEO2 7 VDD 21 STB4 8 STB1 22 STB5 9 STB2 23 STB6 10 STB3 24 STB7 11 TM 25 DI 12 TM 26 VH 13 P-GND 27 VH 14 P-GND 28 VH L-GND : LOGIC GROUND P-GND : POWER GROUND 2/4 KF2004-GF50A Printheads !Timing chart tw CLK CLOCK (CLK) t setup DI t hold DI DATA IN (DI) "High":BLACK "Low" :WHITE td DO DATA OUT (DO) "High":BLACK "Low" :WHITE t hold LAT t setup LAT LATCH (LAT) "High":HOLD "Low" :THROUGH tw LAT t setup STB STROBE (STB) AEO tdo tdo DRIVER OUT Fig.2 !Characteristics Parameter Symbol Typical Unit Effective printing width − 104 mm Dot pitch − 0.125 mm Total dot number − 832 dots Rave 123 Ω VH 3.6 V Average resistance value Applied voltage Applied power PO 0.07 W/dot Print cycle SLT 2.50 ms Pulse width TON 2.02 ms Maximum number of dots energized simultaneously − 64 dots Maximum clock frequency − 8 MHz Maximum roller diameter − φ14.0 Running life / pulse life − 50/1×10 Operating temperature − 0~50 mm 8 km/pulses °C 3/4 KF2004-GF50A Printheads !Electrical characteristic curves 0.8 0.8 1.8 0.6 1.4 0.5 0.4 0.3 0.2 0.1 0 0 1 2 3 4 5 SCANNING LINE TIME (ms/line) SLT : 2.50ms/line 0.7 0.6 ENERGY (mJ/dot) 1.6 OPTICAL DENSITY ENERGY (mJ/dot) Paper : KF50-HDA (OJI) 0.7 1.2 1.0 0.8 0.6 0.4 0.3 0.4 0.2 0.2 0.1 0.0 0.00 0.05 0.10 0.15 0.20 0.25 0.30 ENERGY (mJ/dot) Fig.3 Adaptive speed chart 0.5 Fig.4 Representative density curve 0 0 1 2 3 4 5 SCANNING LINE TIME (ms/line) Fig.5 Maximum energy curve 180 160 RESISTANCE : (kΩ) 140 120 100 80 60 40 20 0 −20 −10 0 10 20 30 40 50 60 70 TEMPERATURE : (°C) Fig.6 Thermistor curve 4/4