AR1020-I/SS Microchip Technology Inc., AR1020-I/SS Datasheet - Page 13

• 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

7.7.2 SPI
SPI operates in slave mode with an idle low SCK and data transmitted on the SCK falling edge.
The SIQ pin functions as an interrupt output. It is asserted high when data is available. The pin has a dual
purpose with driving an optional LED.
The SS pin is optional for “Slave Select” functionality. It is active (selects) when pulled low to VSS. Tie to VSS if
not used.
If data is clocked out when the controller has no valid data to provide, then 0x4d (ASCII "M") will be presented.
Timing diagrams are shown below.
© 2009 Microchip Technology, Inc.
Figure 9 : I
Figure 10 : I
Figure 11 : SPI Timing Diagram – Bit Timing
2
C Timing Diagram – Touch Report Protocol
2
C Timing Diagram – Command Protocol
DS41393A-Page 9