Motorola MC33794DWB electric field sensor

The 33794 is intended for applications where noncontact sensing of objects is desired. When connected to external electrodes, an electric field is created. The 33794 is intended for use in detecting objects in this electric field. The IC generates a low-frequency sine wave. The frequency is adjustable by using an external resistor and is optimized for 120 kHz. The sine wave has very low harmonic content to reduce harmonic interference.

The 33794 also contains support circuits for a microcontroller unit (MCU) to allow the construction of a two-chip E-field system.

Features

• Supports up to 9 Electrodes and 2 References
• Shield Driver for Driving Remote Electrodes Through Coaxial Cables
• +5.0 V Regulator to Power External Circuit
• ISO-9141 Physical Layer Interface
• Lamp Driver Output
• Watchdog and Power ON Reset Timer
• Critical Internal Nodes Scaled and Selectable for Measurement
• High-Purity Sine Wave Generator Tunable with External Resistor

ATMega1280 risc microcontroller

The ATMEGA1280 high-performance, low-power Atmel 8-bit AVR RISC-based microcontroller combines 128KB ISP flash memory, 8KB SRAM, 4KB EEPROM, 86 general purpose I/O lines, 32 general purpose working registers, real time counter, six flexible timer/counters with compare modes, PWM, 4 USARTs, byte oriented 2-wire serial interface, 16-channel 10-bit A/D converter, and a JTAG interface for on-chip debugging. The device achieves a throughput of 16 MIPS at 16 MHz and operates between 2.7-5.5 volts.

By executing powerful instructions in a single clock cycle, the device achieves a throughput approaching 1 MIPS per MHz, balancing power consumption and processing speed.

Key parameters for ATmega1280

• Parameter :Value
• Flash (Kbytes): 128 Kbytes
• Pin Count: 100
• Max. Operating Frequency:16 MHz
• CPU: 8-bit AVR
• # of Touch Channels:16
• Hardware QTouch Acquisition:No
• Max I/O Pins:86
• Ext Interrupts:32
• USB Speed:No
• USB Interface:No
• SPI:5
• TWI (I2C):1
• UART:4
• Graphic LCD:No
• Video Decoder:No
• Camera Interface:No
• ADC channels:16
• ADC Resolution (bits):10
• ADC Speed (ksps):15
• Analog Comparators:1
• Resistive Touch Screen:No
• DAC Resolution (bits):0
• Temp. Sensor:No
• Crypto Engine:No
• SRAM (Kbytes):8
• EEPROM (Bytes):4096
• Self Program Memory:YES
• External Bus Interface:0
• DRAM Memory:No
• NAND Interface:No
• picoPower:No
• Temp. Range (deg C):-40 to 85
• I/O Supply Class:1.8 to 5.5
• Operating Voltage (Vcc):1.8 to 5.5
• FPU:No
• MPU / MMU:no / no
• Timers:6
• Output Compare channels:16
• Input Capture Channels:4
• PWM Channels:15
• 32kHz RTC:Yes
• Calibrated RC Oscillator:Yes