With a sampling rate of 10 Hz, average current consumption is typically 3 µA. In standby mode, between measuring cycles, the idle current reduces to approximately 100 nA. In normal operation iC-TW11 supports sampling rates of 4 kHz with an active filter and automatic amplifier gain for 10-bit resolution at maximum accuracy. A measuring cycle can be operated either via the SPI interface or via a separate trigger input by an external event.
A new position value is signalled to the micro controller via an interrupt. The 4-wire SPI interface can be operated at up to 16 MHz clock frequency. The interrupt structure allows a daisy-chain wiring of multiple iC-TW11 devices, and so a controller can capture multiple rotation axes simultaneously.
Typical applications are:
- Battery-operated dynamic speed measurement in power tools
- Position and motor control in mobile robots or aircraft
- Wireless position measuring with an “energy harvesting“ power supply
- Mobile servo motor and stepper motor controls
- Simple 10-bit encoder with adaptive current consumption
- Digital control knob with high resolution and ultra-cap buffering
- Manually adjustable digital potentiometer
- Control knob with pushbutton function through evaluation of the magnetic field strength
At a voltage supply of 3.3 V (±10%) iC-TW11 operates in the extended industrial operating temperature range from -40 to +125°C. The space requirement of the single-chip encoder iC is especially low due to the QFN16 package measuring 4 x 4 mm.