AT32UC3L0256 Atmel Corporation, AT32UC3L0256 Datasheet - Page 663

• Manufacturer Part Number: AT32UC3L0256
• Manufacturer: Atmel Corporation

Specifications of AT32UC3L0256

• Flash (kbytes): 256 Kbytes
• Pin Count: 48
• Max. Operating Frequency: 50 MHz
• Cpu: 32-bit AVR
• # Of Touch Channels: 17
• Hardware Qtouch Acquisition: Yes
• Max I/o Pins: 36
• Ext Interrupts: 36
• Usb Speed: No
• Usb Interface: No
• Spi: 5
• Twi (i2c): 2
• Uart: 4
• Lin: 4
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 12
• Adc Speed (ksps): 460
• Analog Comparators: 8
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 16
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: Yes
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.62 to 3.6
• Operating Voltage (vcc): 1.62 to 3.6
• Fpu: No
• Mpu / Mmu: Yes / No
• Timers: 6
• Output Compare Channels: 18
• Input Capture Channels: 12
• Pwm Channels: 35
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

28. Capacitive Touch Module (CAT)
28.1
28.2
32145A–12/2011
Features
Overview
Rev: 4.0.0.0
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The Capacitive Touch Module (CAT) senses touch on external capacitive touch sensors. Capac-
itive touch sensors use no external mechanical components, and therefore demand less
maintenance in the user application.
The module implements the QTouch method of capturing signals from capacitive touch sensors.
The QTouch method is generally suitable for small numbers of sensors since it requires 2 physi-
cal pins per sensor. The module also implements the QMatrix method, which is more
appropriate for large numbers of sensors since it allows an X by Y matrix of sensors to be imple-
mented using only (X+2Y) physical pins. The module allows methods to function together, so N
touch sensors and an X by Y matrix of sensors can be implemented using (2N+X+2Y) physical
pins.
In addition, the module allows sensors using the QTouch method to be divided into two groups.
Each QTouch group can be configured with different properties. This eases the implementation
of multiple kinds of controls such as push buttons, wheels, and sliders.
All of the QTouch sensors can operate in a DMA-driven mode, known as DMATouch, that allows
detection of touch without CPU intervention. The module also implements one autonomous
QTouch sensor that is capable of detecting touch without DMA or CPU intervention. This allows
proximity or activation detection in low-power sleep modes.
QTouch® method allows N touch sensors to be implemented using 2N physical pins
QMatrix method allows X by Y matrix of sensors to be implemented using (X+2Y) physical pins
One autonomous QTouch sensor operates without DMA or CPU intervention
All QTouch sensors can operate in DMA-driven mode without CPU intervention
External synchronization to reduce 50 or 60 Hz mains interference
Spread spectrum sensor drive capability
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