AR1020T-I/SO Microchip Technology, AR1020T-I/SO Datasheet - Page 25

• Manufacturer Part Number: AR1020T-I/SO
• Description: IC TOUCH SCREEN CTRLR 20-SOIC
• Manufacturer: Microchip Technology
• Type: Resistiver

Specifications of AR1020T-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
• Supply Voltage Range: 3.135V To 3.465V, 4.75V To 5.25V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: SOIC
• No. Of Pins: 20
• Svhc: No SVHC (15-Dec-2010)
• Supply: RoHS Compliant
• Ic Function: Touch Screen Controller
• Rohs Compliant: Yes
• 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
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Sampling Rate (per Second): -
• Lead Free Status / Rohs Status: Details

7.15.4 Register Read - 0x20
Read a value from a controller register location. This can be used to determine a controller configuration setting.
Configuration registers are defined as an Offset value from the Start address for the register group. Read a
register as follows.
1) Issue the <Register Start Address Request> command to obtain the Start address for the register group.
2) Calculate the desired register’s absolute address by adding the register’s Offset value to Start address for the
3) Issue this <Register Read> command, as follows, using the calculated register’s absolute address
Send
Receive : <0x55><0x02 + # of Registers Read><Response><0x20><Register value>…<Register value>
7.15.5 Register Write - 0x21
Write a value to a controller register location. This can be used to change a controller configuration setting.
Configuration registers are defined as an Offset value from the Start address for the register group. Write a
register as follows.
1) Issue the <Register Start Address Request> command to obtain the Start address for the register group.
2) Calculate the desired register’s absolute address by adding the register’s Offset value to Start address for the
3) Issue this <Register Write> command, as follows, using the calculated register’s absolute address
Send: <0x55><0x04 + # Registers to Write><0x21><Register Address High byte><Register Address Low byte>
Receive : <0x55><0x02><Response><0x21>
7.15.6 Register Start Address Request - 0x22
Configuration registers are defined as an Offset value from the Start address for the register group. This
command returns the Start address for the register group.
Send
Receive : <0x55><0x03><Response><0x22><Register Start Address>
7.15.7 Registers Write to EEPROM - 0x23
Save Configuration Register values to EEPROM. This allows the controller to remember configurations settings
through controller power cycles.
Send
Receive : <0x55><0x02><Response><0x23>
© 2009 Microchip Technology, Inc.
register group.
register group.
: <0x55><0x04><0x20><Register Address High byte><Register Address Low byte><# of Registers to Read>
# of Registers to Read
Register Address High byte
<# of Registers to Write><Data>…<Data>
# of Registers to Write
Register Address High byte
: <0x55><0x01><0x22>
: <0x55><0x01><0x23>
: 0x01 thru 0x08
: 0x00
: 0x01 thru 0x08
: 0x00
DS41393A-Page 21