AD7312

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

˙

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Key scanning (6× 4 matrices)

˙Programming display modes (11-digit &

11-segment to 6-digit & 16-segment)

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Programming dimming step

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2 channels LED ports.

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2-pin General-purpose input port

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Built-in oscillator

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No external resistor necessary for driver outputs

(provides PMOS open-drain and pull-low resistor

output)

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Remote signal input port

˙Remote signal output port

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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.