AS5011

A S5011 Low Power Integrated Hall IC for Human Interface Applications Data Sheet 1 General Description The AS5011 is a complete Hall Sensor IC for smart navigation key applications to meet the low power requirements and host SW integration challenges for products such as cell phones and smart handheld devices. Due to the on chip processing engine, system designers are not tasked with integrating complex SW algorithms on their host processor thus leading to rapid development cycles. The AS5011 single-chip IC includes 4 integrated Hall sensing elements for detecting up to ±2mm lateral displacement, high resolution ADC, XY coordinate and motion detection engine combined with a smart power management controller. The X and Y positions coordinates and magnetic field information for each Hall sensor element is transmitted over a 2-wire I²C compatible interface to the host processor. The AS5011 is available in a small 16-pin 5x5x0.55mm QFN package and specified over an operating temperature of -20 to +80°C. Figure 1 Typical Arrangement of AS5011 and Axial Magnet 3 Key Features 2.7 to 3.6V operating voltage Down to 1.8V peripheral supply voltage Less than 200µA current consumption in Low Power mode Less than 50µA current consumption in Shutdown mode Lateral magnet movement radius up to 2mm I²C interface up to 4MHz Configurable interrupt output for motion detection Three operating modes: Shutdown mode Low Power mode Full Power mode 4 Applications The AS5011 is ideal for small factor manual input devices in battery operated equipment, such as Mobile phones MP3 players PDA’s GPS receivers Gaming consoles 2 Benefits Complete system-on-chip High reliability due to non-contact sensing Low power consumption Figure 2 AS5011 Block Diagram www.austriamicrosystems.com Revision 3.10 1 – 16 AS5011 Data Sheet 5 Package and pinout Figure 3: QFN-16 package and pinout (TOP view) P in# Q FN16 S ymbol T ype D escription 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Epad SDA SCL Sample INTn tb0 tb1 tb2 tb3 Test coil VDDp ScanTest VDD VSS Wakeup Extclk Kill - DIO_OD DI DI DO_OD AIO AIO AIO AIO S DI S S DIO DIO DIO - I²C bus data I²C bus clock Test pin. Connect to VSS Interrupt output. Active LOW Test pin. Leave unconnected Test pin. Leave unconnected Test pin. Leave unconnected Test pin. Leave unconnected Test pin. Connect to VSS Peripheral power supply, 1.8 ~ 3.6V Test pin. Connect to VSS Core power supply, 2.7 ~ 3.6V Supply ground Test pin. Leave unconnected Test pin. Leave unconnected Test pin. Leave unconnected Center pad not connected Table 1: AS5011 pinout in QFN-16 package PIN Types: S ... DI … DO_OD ... supply pad AIO ... digital input DIO_OD... digital output open drain DIO ... analog I/O digital input / output open drain digital input / output www.austriamicrosystems.com Revision 3.10 2 – 16 AS5011 Data Sheet 6 Operating the AS5011 6.1 Typical application The AS5011 requires only a few external components in order to operate immediately when connected to the host microcontroller. Only 4 wires are needed for a simple application using a single power supply: two wires for power and two wires for the I²C communication. A fifth connection can be added in order to send an interrupt to the host CPU when the magnet is moving away from the center and to inform that a new valid coordinate can be read. Figure 4: Electrical connection of AS5011 with microcontroller 6.2 XY coordinates interpretation On Figure 5 the top view of the AS5011 is represented, with a round magnet (scaled) gliding over its surface. The magnet can be placed under the sensor too, with the PCB between them. • Magnet on position 1: The magnet is in its initial position, centered on the sensor. The AS5011 is in Shutdown mode. X and Y register values are (0,0) • Magnet on position 2: The center of the magnet has been moved upon the horizontal wakeup threshold Xp. An interrupt is sent to the host microcontroller which sets the AS5011 to Low Power mode. Wakeup thresholds are programmable independently for the four directions. • Magnet on position 3: The magnet is at the X and Y limit over the sensor surface (2mm, 2mm) but still in range. Figure 5: Position range of the magnet www.austriamicrosystems.com Revision 3.10 3 – 16 AS5011 Data Sheet 6.3 Magnet-chip surface airgap range The relation between the magnet physical position and the resulting XY registers depends on the magnet type/size/shape, and the airgap between the magnet and the top (or bottom) surface of the AS5011. The measurements on Figure 6, Figure 6 Figure 8 have been processed with the AS5000-MA2H-1 d2x0.8mm cylinder magnet, available on austriamicrosystems website. For those magnets, used in EasyPoint modules EP40 and EP50, the airgap range is typically 0~3mm. The following diagrams show the relation between the X register value and the physical X coordinate (±2mm horizontal displacement, 0mm is the center of the chip package) of the magnet at different airgaps. The resulting X value range decreases when the airgap increases The Y axis measurements are the same as the X axis ones. 80 Airgap 1500um 40 30 20 10 Airgap 500um 60 40 20 X register X register 0 -2.500 -2.000 -1.500 -1.000 -500 -10 -20 -30 -40 -50 Magnet position (um) 0 500 1.000 1.500 2.000 2.500 0 -2500 -2000 -1500 -1000 -500 -20 -40 -60 -80 Magnet position (um) 0 500 1000 1500 2000 2500 Figure 6: X register / X displacement (500um airgap) Figure 7: X register / X displacement (1500um airgap) 30 Airgap 2500um 20 10 X register 0 -2.500 -2.000 -1.500 -1.000 -500 -10 0 500 1.000 1.500 2.000 2.500 -20 -30 Magnet position (um) Figure 8: X register / X displacement (2500um airgap) www.austriamicrosystems.com Revision 3.10 4 – 16 AS5011 Data Sheet 6.4 Power modes The AS5011 can operate in three different power modes, depending on the power consumption requirements of the whole system. Power Mode [0x76] Register Description Sleep phase Power state between wakeups in Shutdown and Low Power modes RC clock and analog part OFF Digital part in static mode Shutdown mode Default mode after power on 1001_x00x