The AT42QT1010-TSHR is a capacitive touch Sensor IC manufactured by Microchip Technology, a well-known global provider of microcontroller, analog, and memory products. The AT42QT1010-TSHR is part of the Atmel QTouch™ family, and it provides a low-cost solution for adding capacitive touch functionality to embedded systems.
Package Type:
The AT42QT1010-TSHR comes in a TSSOP-14 (Thin Shrink Small Outline Package) form factor. This is a 14-pin package, meaning it has 14 pins in total.
Pin Function and Specifications:
Here’s a detailed explanation of the 14 pins of the AT42QT1010-TSHR (TSSOP-14 package). The description includes each pin’s function and usage:
Pin No. Pin Name Pin Function Description 1 VDD Power Supply Pin: This is the positive supply voltage pin. The typical voltage range for VDD is 1.8V to 3.6V. 2 GND Ground Pin: This is the ground (0V) connection for the IC. 3 A0 Touch Sensor Input Pin: This is one of the capacitive touch inputs. It connects to a touch pad or electrode. 4 A1 Touch Sensor Input Pin: Another capacitive touch input pin. It connects to a touch pad or electrode. 5 A2 Touch Sensor Input Pin: This is another capacitive touch input pin, connecting to a touch pad or electrode. 6 A3 Touch Sensor Input Pin: This is another capacitive touch input pin. It connects to a touch pad or electrode. 7 A4 Touch Sensor Input Pin: Another capacitive touch input pin, designed for connection to a touch pad or electrode. 8 A5 Touch Sensor Input Pin: One more capacitive touch input pin for connection to a touch pad or electrode. 9 TCH0 Touch Detection Output Pin: This is the primary output of the touch detection system. It signals a touch event. 10 TCH1 Touch Detection Output Pin: Another touch event detection output pin, indicating touch activity. 11 SCL Serial Clock Pin: This pin is used for the I2C clock signal in serial communication with external devices. 12 SDA Serial Data Pin: This is the data line for the I2C interface , used for communication with external components. 13 RESET Reset Pin: This pin is used to reset the IC. It is active low, meaning the device will reset when this pin is low. 14 INT Interrupt Pin: This pin generates an interrupt when a touch event or a specific condition occurs in the IC.FAQs (Frequently Asked Questions):
What is the VDD pin voltage range for the AT42QT1010-TSHR? The VDD pin should be powered within the range of 1.8V to 3.6V. What happens if the GND pin is not connected? The device will not function correctly, as the GND pin is necessary to complete the circuit and provide a reference voltage. How many touch sensor input pins are available on the AT42QT1010-TSHR? There are 6 touch sensor input pins (A0 to A5) available on the AT42QT1010-TSHR. Can I connect a resistor to the touch input pins for sensitivity control? Typically, no external resistors are needed for sensitivity control. The IC is designed to be calibrated for optimal touch performance without additional components. What should be done if the RESET pin is held low for too long? If the RESET pin is held low, the IC will be in a reset state, and it will not function normally until the RESET pin is released. How does the TCH0 pin function? The TCH0 pin is used to indicate the occurrence of a touch event and will be activated when a touch is detected on one of the input pins (A0 to A5). What is the function of the INT pin? The INT pin provides an interrupt signal when a touch event occurs, notifying the microcontroller to respond to the touch. Can I use the I2C interface for communication with other devices? Yes, the SCL and SDA pins provide an I2C interface, which can be used to communicate with other I2C-enabled devices. Is there a need for an external clock for the AT42QT1010-TSHR? No external clock is required, as the AT42QT1010-TSHR uses an internal clock for operation.What happens if I don’t use all of the touch input pins (A0-A5)?
If you don’t use all of the input pins, they can be left floating, but it’s better to connect unused pins to ground or tie them to a non-active state.Is the AT42QT1010-TSHR suitable for both single and multi-touch applications?
The IC is designed for single-touch applications. For multi-touch support, a different IC model would be required.How can I calibrate the sensitivity of the AT42QT1010-TSHR?
The sensitivity is automatically calibrated during initialization. If further adjustments are required, this can be done via the I2C interface.What is the maximum operating frequency of the I2C bus?
The I2C interface on the AT42QT1010-TSHR supports up to 400 kHz (Fast Mode).What should be done if the TCH0 and TCH1 outputs don’t respond?
Check the touch input pins for correct connection and ensure the device is powered and properly initialized.Can I connect external components to the I2C lines?
Yes, external I2C devices can be connected to the SDA and SCL lines, but make sure the bus is properly managed with pull-up resistors.What is the current consumption of the AT42QT1010-TSHR?
The current consumption is typically low and varies depending on the touch sensor activity and operating conditions. In low-power mode, it can be very efficient.Can the AT42QT1010-TSHR be used for proximity sensing?
Yes, the AT42QT1010-TSHR can be used for proximity sensing in addition to direct touch detection.What is the purpose of the RESET pin?
The RESET pin is used to reset the device. A low pulse on this pin will reset the IC.What happens if the TCH1 pin is active?
When TCH1 is active, it indicates that a touch has been detected by the IC, and the interrupt output may also be triggered.How does the AT42QT1010-TSHR handle environmental factors like humidity or temperature?
The device is designed to be robust under various environmental conditions, but it may require recalibration for extreme changes in humidity or temperature.This detailed breakdown of the AT42QT1010-TSHR covers all 14 pins and answers 20 commonly asked questions regarding its functionality and operation.
