DS1680

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AVD, AVS (ADC Supply and Ground) – Power supply and ground for the ADC.

AIN0, AIN1 (Analog Inputs) – These pins are the analog inputs for the ADC.

X+, X- (Resistive Tablet X Plane Driver) – Connect to X-terminal of resistive tablet.

Y+, Y- (Resistive Tablet Y Plane Driver) – Connect to Y-terminal of resistive tablet.

CONVERT

ANSELIN (Analog Select Input) – Assert to logic 0 to select AIN0. Assert to logic 1 to select AIN1.

Use with CONVERT input.

BHE (Bus High Enable Input) – Drive to logic 1 to select high byte (data bits 2–9). Drive to logic 0 to

select low byte (data bits 0–1). The lower 6 bits will all be zeros when asserted low.

PEN_SELECT (Pen Select Input) – Assert to logic 1 to select X- or Y- data output. Assert to logic 0 to

select AIN0 or AIN1 data output. Use with OUT_SELECT input.

OUT_SELECT (Output Select Input) – Assert to logic 0 to select AIN0 or X- data. Assert to logic 1 to

select AIN1 or Y- data. Use with PEN_SELECT input.

COEN (Chip Output Enable) – The COEN pin must be asserted low to enable the ADC data to be

read on D0–D7.

D0-D7 (Data Bus) – Data output from ADC.

AVG (Data Average Select Pin) – Logic 1 selects data average mode; logic 0 selects raw data mode.

NEW_DATA

(New Data Indicator) – A logic 0 pulse indicates that new data packet is available on

D0–D7.

OSCIN (Oscillator Input) – Input for the ADC clock.

PEN_OFF (Pen Detection Output) – Indicates pen not detected. Logic 1 if pen is not detected.

PD_RESET (Power Down/Reset Input) – Assert logic 1 for

≥10ns to reset. Hold at logic 1 for power-

down mode of the analog circuitry.