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1 / 12 page AD7312 1/4 to 1/11 Duty VFD Controller/Driver & Standby Master/Slave (Preliminary) This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product. Rev. A2 Dec 29, 2003 1/12 Features ˙ Serial interface (CLK, STB, DIN, DOUT) ˙ Key scanning (6× 4 matrices) ˙Programming display modes (11-digit & 11-segment to 6-digit & 16-segment) ˙ Programming dimming step ˙ High-voltage output (VDD-35V max). ˙ 2 channels LED ports. ˙ 2-pin General-purpose input port ˙ Built-in oscillator ˙ No external resistor necessary for driver outputs (provides PMOS open-drain and pull-low resistor output) ˙ Remote signal input port ˙Remote signal output port ˙ 3 STANDBY master output ports (controlled by remote STANDBY-KEY, STANDBY-KEY and STANDBY SCAN-KEY) ˙ 8 WAKE UP master output ports (controlled by 2 remote WAKE_UP-KEY, 3 WAKE_UP SCAN-KEY, remote STANDBY-KEY, STANDBY-KEY and STANDBY SCAN-KEY) ˙ NEC 6121/6122 infrared protocol support General Description The AD7312 is a VFD (Vacuum Fluorescent Display) controller/driver with STANDBY controller. It is driven on a 1/4 to 1/11 duty factor (include key scan). It consists of 5 segment output lines, 6 segment/key scan output lines, 6 grid output lines, 5 segment/grid output drive lines, 2 LED output ports, a display memory, a control circuit, and a key scan circuit. In addition, it includes 2 input ports, RMIN and SKEY, RMIN receives the signal form the STANDBY-KEY of remote sensor, SKEY can be controlled by an external switch. Both of them and STANBY SCAN-KEY can control the output level (High) of PSV port to realize the STANDBY function. To leave the standby mode, we can use the 2 remote WAKE_UP-KEY, 3 WAKE_UP SCAN-KEY, remote STANDBY-KEY, STANDBY-KEY and STANDBY SCAN-KEY to control the output level (Low) of PSV port to realize the Wake Up function. Serial data is input to the AD7312 through a four-line serial interface. |
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