AR1011T-ISLASHSS datasheet(19/61 Pages) MICROCHIP

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DS40001393C-page 19

AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER

5.2

SPI Pin Voltage Level

Characteristics

5.3

Data Flow

SPI data is transferred by the host clocking the AR1021

controller’s Serial Clock (SCK) pin.

Each host driven clock cycle simultaneously shifts a bit

of data into and out from the AR1021 controller:

• Out from the AR1021 controller’s Serial Data Out

(SDO) line.

• Into the AR1021 controller’s Serial Data In (SDI)

line.

The data is shifted Most Significant bit (MSb) first.

If the host clocks data out from the AR1021 controller

when no valid data is available, then a byte value of

0x4d will be presented by the controller.

5.4

Touch Report Protocol

The AR1021 controller’s touch reporting is interrupt

driven:

• The AR1021 controller asserts the SIQ interrupt

pin high when it has a touch report ready.

• The host clocks out the bytes of the touch report

packet from the AR1021 controller.

• The AR1021 controller clears the SIQ interrupt pin

low, after the first byte of the touch report packet

has been clocked out by the host.

The communication protocol for the AR1021 controller

reporting touches to the host as shown below in

Figure 5-1.

FIGURE 5-1:

SPI TOUCH REPORT PROTOCOL

TABLE 5-2:

SPI PIN VOLTAGE CHARACTERISTICS

Operating Voltage:

2.5V ≤ VDD ≤ 5.25V

Function

Input

Output

SCK

SCL/SCK/TX

VSS ≤ VIL ≤ 0.2*VDD

0.8*VDD ≤ VIH ≤ VDD

—

SDI

SDI/SDA/RX

VSS ≤ VIL ≤ 0.2*VDD

0.8*VDD ≤ VIH ≤ VDD

—

SDO

—

VSS ≤ VOL(1) ≤ (1.2V – 0.15*VDD)(2)

(1.25*VDD – 2.25V)(3) ≤ VOH(1) ≤ VDD

SIQ

—

VSS ≤ VOL(1) ≤ (1.2V – 0.15*VDD)(2)

(1.25*VDD – 2.25V)(3) ≤ VOH(1) ≤ VDD

VSS ≤ VIL ≤ 0.2*VDD

0.8*VDD ≤ VIH ≤ VDD

Note 1:

These parameters are characterized but not tested.

At 10 mA.

At -4 mA.

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