AR1020-I/ML Microchip Technology, AR1020-I/ML Datasheet - Page 14

• Manufacturer Part Number: AR1020-I/ML
• Description: IC TOUCH SCREEN CTRLR 20-QFN
• Manufacturer: Microchip Technology
• Type: Resistiver

Specifications of AR1020-I/ML

• Resolution (bits): 10 b
• Touch Panel Interface: 4-Wire, 5-Wire, 8-Wire
• Number Of Inputs/keys: 3 Key
• Data Interface: I²C, Serial, SPI™
• Voltage - Supply: 3.3 V ~ 5.5 V
• Current - Supply: 17mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-VQFN Exposed Pad, 20-HVQFN, 20-SQFN, 20-DHVQFN
• Voltage Supply Source: Single Supply
• Controller Type: Touch Screen
• Ic Interface Type: I2C, SPI
• Supply Voltage Range: 3.3V To 5V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: QFN
• No. Of Pins: 20
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Sampling Rate (per Second): -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

7.7.3 UART
The SDO pin is not used and must be left as a “no connect”. Do NOT tie it directly to VSS or VDD.
UART communication is at a fixed 9600 baud rate.
7.8 Status LED
The LED and associated resistor are optional.
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.
DS41393A-Page 10
If the SIQ pin is not used, it must be left as a no connect and NOT tied to circuit VDD or VSS.
Figure 12 : SPI Timing Diagram – Touch Report Protocol
Figure 13 : SPI Timing Diagram – Command Protocol
© 2009 Microchip Technology, Inc.