AR1020-I/SS Microchip Technology Inc., AR1020-I/SS Datasheet - Page 18

• Manufacturer Part Number: AR1020-I/SS
• Description: Touch Sensing Controller, 20 SSOP .209in TUBE
• Manufacturer: Microchip Technology Inc.

Specifications of AR1020-I/SS

• Operating Voltage: 3.3 to 5.0 Volts ±5%
• Standby Sleep Current: <1 μA
• Operating “no Touch” Current: 3.0 mA Typ.
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

7.12.8 SleepDelay Register (offset 0x0A)
The SleepDelay register sets the time duration with no touch or command activity that will cause the controller to
enter a low power sleep mode. Valid values are as follows.
0 ≤ SleepDelay ≤ 255
Sleep Delay Time = SleepDelay * 100ms
A value of zero disables the Sleep Mode, such that the controller will never enter low power sleep mode.
A touch event will wake the controller from low power sleep mode and start sending touch reports.
Communications sent to the controller will wake it from the low power sleep mode and initiate action to the
command.
7.12.9 PenUpDelay Register (offset 0x0B)
The PenUpDelay register sets the duration of a pen up event that the controller will allow, without sending a pen
up report for the event. The delay time is started upon detecting a pen up condition. If a pen down is
reestablished before the delay time expires, then pen down reports will continue without a pen up being sent.
This effectively debounces a touch event in process.
A lower value will make the controller more responsive to pen ups, but will cause more touch drop outs with a
lighter touch. A higher value will make the controller less responsive to pen ups, but will reduce the number of
touch drop outs wit a lighter touch. Valid values are as follows.
0 ≤ PenUpDelay ≤ 255
Pen Up Delay Time ≈ PenUpDelay * 240μs
DS41393A-Page 14
© 2009 Microchip Technology, Inc.