AR1020-I/ML Microchip Technology, AR1020-I/ML Datasheet - Page 8

• 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 FUNCTIONAL DESCRIPTION
7.1 Main Schematic
A main application schematic is shown below for the SOIC/SSOP package pinout. See the Pin Diagram section
for the QFN package pinout.
7.2 Bill of Materials
Modifying, removing, or adding components may adversely affect touch performance.
Specific manufacturers and part numbers are provided only as a guide. Equivalents can be used.
Note 1: C5 is only needed for 5-wire applications.
Note 2: D1-D8 are for ESD protection.
DS41393A-Page 4
C1
C2
C3, C4, C5
D1-D8
R1
U1
Label
2
Figure 3 : Main Schematic (SOIC, SSOP package pin out)
Table 3 : Bill of Materials



The capacitance of alternate ESD diodes may adversely affect touch performance. A lower
capacitance is better. The PESD5V0S1BA parts shown in the reference design have a typical
capacitance of 35pF. 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.
1
4-wire touch screen, use D1-D4
5-wire touch screen, use D1-D5
8-wire touch screen, use D1-D8
Qty
2-3
4-8
1
1
1
1
20K ohm
0.01 uF
130 W
0.1 uF
Value
10 uF
Na
Resistor - 20K ohm, 1/10W, 5%, 0603
Touch controller IC
Capacitor – Ceramic,
Capacitor – Ceramic, 0.1uF, 10%, 16V, X7R, 0603
Capacitor – Ceramic, 0.01uF, 10%, 50V, X7R, 0603
Diode – Bi-dir., 130W, ESD Protection, SOD323
Description
10uF, 20%, 6.3V, X7R, 0603
Manufacturer
AVX
AVX
AVX
NXP
Yageo America
Microchip
© 2009 Microchip Technology, Inc.
06036D106MAT2A
0603YC104KAT2A
06035C103KAT2A
PESD5V0S1BA
RC0603JR-0720KL
AR1010 or AR1020
Part Number