UT912E

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

6

www.unisonic.com.tw

QW-R502-022,B

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FUNCTIONAL DESCRIPTION

Operation

The UTC UT912E start a cycle of 4-words transmission upon receipt of a transmission enable (TE). A completed

cycle is showed as below. This cycle will repeat itself as long as the transmission enable is held low. While the

transmission enable returns high the encoder output completes its final cycle and then stops.

<1 word

TE

4 words

Encoder

DOUT

Transmitted

Continuously

4 words

Address/data bit waveform

Each programmable address/data pin can be externally set to one of the following two logic states as shown

below.

fosc

"One"

"Zero"

Address/

Data Bit

Address/data programming (preset)

The status of each address/data pin can be individually pre-set to logic ”high” or ”low”. If a transmission-enable

signal is applied, the encoder scans and transmits the status of the 12 bits of address/data serially in the order A0 to

AD11. During information transmission these bits are transmitted with a preceding synchronization bit. If the trigger

signal is not applied, the chip enters the standby mode and consumes a reduced current of less than 1μA for a

supply voltage of 5V.

The following figure shows an application using the UTC UT912E:

OSC1 OSC2

Transmission

Medium

DOUT

Transmitted information:

A0

A1

A2

A3

A4

A5

A6

A7

AD8

AD9

AD10

AD11

Pilot &

Sync.

1

0

1

0

0

0

1

1

1

1

1

0