AS5055-EQFT-500 ams

AS5055 Low Power 12-Bit Magnetic Rotary Encoder 1 General Description 2 Key Features 12-bit resolution The AS5055 is a single-chip magnetic rotary encoder IC with low voltage and low power features. Standard SPI interface, 3 or 4 wire It includes 4 integrated Hall elements, a high resolution ADC and a 3.0V to 3.6V core voltage, 1.8V to 3.6V peripheral supply smart power management controller. voltage The angle position, alarm bits and magnetic field information are Automatic wake-up over SPI interface transmitted over a standard 3-wire or 4-wire SPI interface to the host Interrupt output for conversion complete indication processor. Low power mode: The AS5055 is available in a small QFN 16-pin 4x4x0.85 mm package and specified over an operating temperature of -40C to - < 5mA (avg) 1ms readout interval +85C. - < 500A (avg) 10ms readout interval - < 53A (avg) 100ms readout interval Small size 16-pin QFN (4x4x0.85 mm) 3 Applications The device is ideal for Servo motor control, Input device for battery operated portable devices, and Robotics. Figure 1. AS5055 Block Diagram EN INT/ AS5055 INT/ ADC Cordic Hall Sensors SPI Interface VDDp Power Management VSS Wire VDD MOSI MISO SCK SS/ mode www.ams.com/AS5055 Revision 1.16 1 - 26AS5055 Datasheet - Contents Contents 1 General Description .................................................................................................................................................................. 1 2 Key Features............................................................................................................................................................................. 1 3 Applications............................................................................................................................................................................... 1 4 Pin Assignments ....................................................................................................................................................................... 3 4.1 Pin Descriptions.................................................................................................................................................................................... 3 5 Absolute Maximum Ratings ...................................................................................................................................................... 4 6 Electrical Characteristics........................................................................................................................................................... 5 6.1 Operating Conditions............................................................................................................................................................................ 5 6.2 System Parameters .............................................................................................................................................................................. 5 6.3 DC/AC Characteristics.......................................................................................................................................................................... 6 7 Detailed Description.................................................................................................................................................................. 7 7.1 Operating Modes.................................................................................................................................................................................. 7 7.1.1 Power Supply Filter...................................................................................................................................................................... 7 7.1.2 Reading an Angle ........................................................................................................................................................................ 8 7.1.3 Low Power Mode ......................................................................................................................................................................... 8 7.1.4 Interrupt Chaining ........................................................................................................................................................................ 8 7.2 SPI Communication.............................................................................................................................................................................. 9 7.2.1 Command Package ..................................................................................................................................................................... 9 7.2.2 Read Package (Value Read from AS5055) ................................................................................................................................. 9 7.2.3 Write Data Package (Value Written to AS5055) ........................................................................................................................ 10 7.2.4 Register Block............................................................................................................................................................................ 10 7.2.5 SPI Interface Commands........................................................................................................................................................... 11 7.2.6 Error Monitoring.......................................................................................................................................................................... 14 8 Application Information ........................................................................................................................................................... 16 8.1 SPI Interface....................................................................................................................................................................................... 16 8.1.1 SPI Interface Signals (4-Wire Mode, Wire mode = 1)............................................................................................................... 16 8.1.2 SPI Timing ................................................................................................................................................................................. 17 8.1.3 SPI Connection to the Host C ................................................................................................................................................. 18 8.1.4 SPI Over Long Distances .......................................................................................................................................................... 20 8.2 Placement of the Magnet.................................................................................................................................................................... 21 9 Package Drawings and Markings ........................................................................................................................................... 22 10 Ordering Information............................................................................................................................................................. 25 www.ams.com/AS5055 Revision 1.16 2 - 26