Data Sheet AEAT-8811-Q24 Magnetic Encoder IC: 10-Bit to 16-Bit Programmable Angular Magnetic Encoder with No Offset Calibration Overview Key Features 5V operation The Broadcom AEAT-8811-Q24 is an angular magnetic Selectable 10, 12, 14, or 16 bits of absolute resolution rotary sensor that provides accurate angular measurement Incremental output of ABI UVW (32, 64, 128, 256, 512, over a full 360 degrees of rotation. 1024, 2048, 4096, 50, 100, 200, 400, 800, 1000, 2000, 4000 CPR) It is a sophisticated system that uses integrated Hall sensor PWM output modes elements with complex analog and digital signal processing User-programmable zero position, direction, and index within a single device. width A simple two-pole magnet generates the necessary Selectable zero latency mode option magnetic field by rotating it in perpendicular, placed in Programmable hysteresis alignment to the center of the device. Available in 2-wire or 3-wire SSI options. Selectable 3-wire SSI option with initial data output at tri-state The Broadcom AEAT-8811-Q24 is a versatile solution mode capable of supporting a broad range of applications with its Compact QFN-24 leads (5 mm 5 mm) package robust architecture to measure and deliver both absolute RoHS compliant and incremental signals. No programming required for offset calibration The absolute angle measurement provides an instant indication of the magnet s angular position with a selectable Specifications and one-time programmable resolution of 10, 12, 14, or Absolute 10-bit to 16-bit resolution 16 bits. When selected, its positioning data is then Incremental output resolutions of 32 to 4096 CPR represented in its digital form to be assessed through a standard SSI 3-wire communication protocol. Where UVW output of 1 to 8 pole pairs desired, users may also choose to receive its absolute angle Wide operating temperature: 40C to 125C position in PWM-encoded output signals. Applications The incremental positions are indicated on ABI and UVW signals with user-configurable CPR 32, 64, 128, 256, 512, Brushless DC motor and stepper motor 1024, 2048, 4096 and 50, 100, 200, 400, 800, 1000, 2000, Resolver and potentiometer replacement and 4000 of ABI signals and pole pairs from 1 to 8 (2 to 16 Industrial automation and robotics poles) for UVW commutation signals. AEAT-8811-Q24 Industrial sewing machine and textile equipment requires no offset calibration programming and operates at 5V supply. Broadcom AEAT-8811-Q24-DS100 February 21, 2020Magnetic Encoder IC: 10-Bit to 16-Bit Programmable Angular Magnetic Encoder with No AEAT-8811-Q24 Data Sheet Offset Calibration Figure 1: ABI Signals of AEAT-8811-Q24 NOTE: This product is not specifically designed or manufactured for use in any specific device. Customers are solely responsible for determining the suitability of this product for its intended application and are solely liable for all loss, damage, expense, or liability in connection with such use. Definition Electrical Degree (e): CPR 360 electrical degrees = 360 mechanical degrees. Cycle (C): One cycle of the incremental signal is 360 mechanical degrees/resolution and is equal to 360 electrical degrees (e). Pulse Width (P): The number of electrical degrees that an output is high during one cycle, nominally 180e or one-half Integral non-linearity (INL): The maximum deviation of a cycle. between the actual angular position and the position indicated by the encoder s output count, over one State Width (S): The number of electrical degrees between revolution. It is defined as the most positive linearity error a transition in the output of channel A and the neighboring +INL or the most negative linearity error INL from the best transition in the output of channel B. There are four states fit line, whichever is larger. per cycle, each nominally 90e. Figure 2: Integral Non-Linearity Example Phase (): The number of electrical degrees between the center of the high state on channel A and the center of the high state on channel B. Relative angular accuracy: With reference to the output period at A and B. The relative accuracy of the edges to each other at a CPR setting of 256 is within 10% for 5V operation in a typical condition. Therefore, based on a period at A or B, the edge occurs in a window between 40% and 60% as shown in the following figure. Broadcom AEAT-8811-Q24-DS100 2