AR1010-ISLASHML datasheet(15/70 Pages) MICROCHIP

15 / 70 page

 2009-2012 Microchip Technology Inc.

Preliminary

DS41393B-page 15

AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER

3.6

Status LED

The LED and associated resistor are optional.

FIGURE 3-5:

The LED serves as a status indicator that the controller

is functioning. It will slow flash when the controller is

running with no touch in progress. It will flicker quickly

(mid-level on) when a touch is in progress.

If the LED is used with SPI communication, then the

LED will be off with no touch and flicker quickly

(mid-level on) when a touch is in progress.

3.7

WAKE Pin

The AR1000’s WAKE pin is described as “Touch

Wake-Up/Touch Detection”. It serves the following

three roles in the controller’s functionality:

• Wake-up from touch

• Touch detection

• Measure sensor capacitance

The application circuit shows a 20 KΩ resistor

connected between the WAKE pin and the X- pin on the

controller chip. The resistor is required for product

operation, based on all three of the above roles.

3.8

ESD Considerations

ESD protection is shown on the 4-wire, 5-wire, and

8-wire interface applications schematics.

The capacitance of alternate ESD diodes may

adversely

affect

touch

performance.

lower

capacitance is better. The PESD5V0S1BA parts shown

in the reference design have a typical capacitance of 35

pF. Test to ensure that selected ESD protection does

not degrade touch performance.

ESD protection is shown in the reference design, but

acceptable protection is dependent on your specific

application. Ensure your ESD solution meets your

design requirements.

3.9

Noise Considerations

Touch sensor filtering capacitors are included in the

reference design.

Note:

If the SIQ pin is not used, it must be left as

a No Connect and NOT tied to circuit VDD or

VSS.

Warning: Changing the value of the capacitors may

adversely affect performance of the touch system.

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