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Product Detailed Parameters
- Description：IC SCREEN CNTRL 10BIT 20SOIC
- Series：mTouch™
- Mfr：Microchip Technology
- Package：Tube
- Touchscreen：4, 5, or 8 Wire Resistive
- Resolution (Bits)：10 b
- Interface：I2C, Serial, SPI
- Voltage Reference：-
- Voltage - Supply：2.5V ~ 5V
- Operating Temperature：-40°C ~ 85°C
- Mounting Type：Surface Mount
- Package / Case：20-SOIC (0.295", 7.50mm Width)
- Supplier Device Package：20-SOIC
- Current - Supply：17 mA
- Grade：-
- Qualification：-
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Overview
The Microchip Technology AR1021-I/SO is a resistive touch screen controller from the mTouch AR1000 Series, designed for 4-wire, 5-wire, and 8-wire analog sensors. It features a 10-bit resolution with a typical report rate of 140 reports per second. The device operates on a 2.5V to 5.0V supply, drawing 17 mA during active touch detection. It supports I2C slave communication at up to 400 kHz with a fixed 7-bit address of 0x4D. Key specifications include built-in drift compensation, 128 bytes of user EEPROM for calibration storage, and an industrial temperature range.
Feature Summary
- Supports 4-wire, 5-wire, and 8-wire analog resistive touch sensors with proprietary decoding algorithms.
- Includes 128 bytes of onboard User EEPROM for independent coordinate calibration storage.
- Features built-in drift compensation algorithms to maintain accuracy over time and environmental changes.
- Provides low-power operation with standby currents as low as 40 µA (typical) at 2.5V.
Applications
- Mobile communication devices
- Personal Digital Assistants (PDA)
- Global Positioning Systems (GPS)
- Point of Sale Terminals
Procurement Notes
Verify that the specific ordering suffix corresponds to the SOIC-20 package variant. Confirm the 'I' designation indicates the industrial temperature range (-40°C to +85°C). Ensure the host system utilizes I2C communication, as this part number does not support SPI or UART interfaces.
Selection Notes
Select the AR1021-I/SO when I2C connectivity is required for the host microcontroller. This model is distinct from the AR1011 (UART) and AR1021T variants (which may differ in packaging or interface options). Ensure the touch sensor layer resistance falls within the 50-2,000 Ω typical range for optimal performance.
Part Context
This component belongs to the Microchip mTouch AR1000 Series, which provides universal resistive touch control solutions. The AR1021 variant specifically implements I2C slave mode communication, differentiating it from other series members that utilize SPI or UART protocols for data transfer.
Replacement Considerations
The AR1021-I/SS is a pin-compatible alternative in the SSOP-20 package. For applications requiring SPI communication, the AR1021T is the appropriate functional substitute. Verify that any replacement maintains the same I2C address and voltage requirements.
FAQ
What is the default I2C address for the AR1021?
The AR1021 uses a fixed 7-bit device ID address of 0x4D (binary 1001101).
How is the M1 pin configured for I2C operation?
To select I2C communications, the M1 pin must be connected to VSS.
Does the AR1021 support clock stretching?
Yes, the AR1021 may hold off the master by stretching the SCL line low if it is not ready to continue communications.
