AR1020-I/SO Microchip Technology, AR1020-I/SO Datasheet - Page 11
![IC TOUCH SCREEN CTRLR 20-SOIC](/photos/6/64/66480/150-20-soic_sml.jpg)
AR1020-I/SO
Manufacturer Part Number
AR1020-I/SO
Description
IC TOUCH SCREEN CTRLR 20-SOIC
Manufacturer
Microchip Technology
Type
Resistiver
Specifications of AR1020-I/SO
Package / Case
20-SOIC (7.5mm Width)
Touch Panel Interface
4-Wire, 5-Wire, 8-Wire
Number Of Inputs/keys
3 Key
Resolution (bits)
10 b
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
Voltage Supply Source
Single Supply
Resolution
10 bit
Interface Type
I2C, SPI
Supply Voltage (max)
5 V
Supply Voltage (min)
3.3 V
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Supply Current
300 mA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Sampling Rate (per Second)
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
AR1020-I/SO
Manufacturer:
NSC
Quantity:
1 500
Part Number:
AR1020-I/SO
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
7.6 8-wire Touch Sensor Interface
Sensor tail pin-outs can vary by manufacturer and part number. Ensure both sensor tail pins for one sensor axis
(layer) are connected to the controller’s X–/X+ pins and the tail pins for the other sensor axis (layer) are
connected to the controller’s Y–/Y+ pins. The controller’s X–/X+ and Y–/Y+ pin pairs do not need to connect to a
specific sensor axis. The orientation of controller pins X– and X+ to the two sides of a given sensor axis is not
important. Likewise, the orientation of controller pins Y– and Y+ to the two sides of the other sensor axis is not
important.
The 8-wire sensor differs from a 4-wire sensor in that each edge of an 8-wire sensor has a secondary connection
brought to the sensor’s tail. These secondary connections are referred to as “sense” lines. The controller pins
associated with the sense line for an 8-wire sensor contain an ‘S’ prefix in their respective names. For example,
the SY– pin is the sense line connection associated with the main Y– pin connection.
Consult with the sensor manufacturer’s specification to determine which member of each edge connected pair is
the special 8-wire “sense” connection. The controller requires that the main and “sense” tail pin pairs for sensor
edges be connected to controller pin pairs as follows.
Connections to a 8-wire touch sensor are as follows.
© 2009 Microchip Technology, Inc.
Y– and SY–
Y+ and SY+
X– and 5WSX–
X+ and SX+
Figure 6 : 8-wire Touch Sensor Interface
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.
DS41393A-Page 7