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BU2879AK

Rohm
Part Number BU2879AK
Manufacturer Rohm
Description FL tube driver
Published Apr 17, 2005
Detailed Description Standard ICs FL tube driver BU2879AK The BU2879AK is a driver IC for fluorescent displays. It is equipped with 26 high-...
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BU2879AK
BU2879AK

Overview
Standard ICs FL tube driver BU2879AK The BU2879AK is a driver IC for fluorescent displays.
It is equipped with 26 high-voltage withstand outputs and can display from 11 segments of 15 characters to 16 segments of 8 characters.
This IC is equipped with a key scanning function, and general-purpose input pins, and is ideal for front panels in VTRs and other equipment.
A serial interface allows functions to be controlled from a microcomputer.
Applications • VCRs Features • 1) High withstanding voltage output.
2) Display modes: 11S × 15G ~ 16S × 8G.
3) Variable display luminance (7 steps).
4) 3-wire serial interface.
5) Key scanning function (6 × 4).
6) Internal pull-down resistance (high voltage withstand output).
7) QFP 44 package.
•Absolute maximum ratings (Ta = 25°C, V Parameter Applied voltage 1 Applied voltage 2 Input voltage Power dissipation Operating temperature Storage temperature Symbol VDD VEE VIN Pd Topr Tstg SS = 0V) Limits – 0.
3 ~ + 7.
0 VDD + 0.
3 ~ VDD – 40 – 0.
3 ~ VDD + 0.
3 850∗ – 25 ~ + 75 – 55 ~ + 125 Unit V V V mW °C °C Note) Operation is not guaranteed at these values.
Note) Power dissipation is reduced by 8.
5mW for each increase in Ta of 1°C over 25°C.
∗ When mounted on a 70 × 70 × 1.
6mm glass epoxy board •Recommended operating conditions (Ta = 25°C, V Parameter Operating power supply voltage 1 Operating power supply voltage 2 Symbol VDD VEE SS = 0V) Min.
4.
5 Typ.
5.
0 VDD – 35 Max.
5.
5 VDD – 0 Unit V V VDD – 37 1 Standard ICs BU2879AK •Block diagram CS SCK SI SO VSS OSC VDD 8bit shift-REG.
OSC CONTROL LOGIC 16bit latch SW4 4bit data G1 SW1 16bit × 15word DISPLAY DATA RAM K4 KEY DATA latch (4 × 6) K1 GRID Driver G10 SEGMENT Driver S / G Driver S1 S11 S12 / G15 S16 / G11 VEE 2 Standard ICs BU2879AK •Pins descriptions Pin No.
14, 38 44 7, 43 6 5 8 9 15 ~ 25 27 42 ~ 39, 37 ~ 32 26, 28 ~ 31 10 ~ 13 Pin VDD OSC VSS SI SO SCK CS S1 ~ S11 VEE G1 ~ G10 S12 / G15 S16 / G11 K1 ~ K4 ~ SW1 ~ SW4 Name Power supply pin 1 Oscillation p...


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