PT8146 Datasheet, PDF(7/27 Page) Princeton Technology Corp

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PT8146 Datasheet, PDF (7/27 Pages) Princeton Technology Corp – 8-Bit 12-Ch I/O DAC

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8-Bit 12-Ch I/O DAC

PT8146

I/O EXPANDER (CHANNEL SELECT = â1101â): SERIAL â PARALLEL

CONVERSION

Performs parallel conversion of data bits D4 to DF for output on pins D0 to D11.

Note that only those pins designated for output in the ESR (expander status register) are output.

Shift register

DF DE DD DC DB DA D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

Parallel I/O pins (output state)

D11 D10 D9

I/O EXPANDER (CHANNEL SELECT = â1110â): PARALLEL â SERIAL

CONVERSION

Writes data from D0 to D11 pins to bits D4 to DF in the shift register.

Data is output to the SO pin on the shift clock (CLK) signal. (The first 4 bits output data D0 to D3, so the

converted output should be read as data bits 5 through 16.)

Note that the data value is â0â for pins designated for output in the ESR (expander status register) as

well as analog output pins.

Shift register

DF DE DD DC DB DA D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

Parallel I/O pins (output state)

D11 D10 D9

PT8146 V1.1

-7-

February, 2006

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