HS40J (Preliminary) Encoder modules • BLDC / PMSM Motor Control • Stepping Motor Closed-Loop Systems • Robotics & Collaborative Robots • Automated Equipment & Industrial Motion Control • Precision Positioning & Actuator Feedback Single-turn: 12-bit(0.0879° resolution) Multi-turn: 46 turns (0°~16,560°) Features True power-on battery-less multiturn counter ' Up to 46 turns non-volatile magnetic turn tracking ±0.25° single-turn angle accuracy (with supplied magnet & spacer, within specified operating window) ■ High-speed 100 kSPS update rate ■ Compact, robust, contamination-resistant magnetic design ■ Built-in diagnostics for safety-critical applications (UV/OV, GMR/AMR fault, CRC, ECC) Clockwise (CW) turn count increment Compact size and easy mounting • Electrical Specifications {3} PS. Dynamic phase lag due to system latency: error(°) = 8.64x10-4 x rpm Copyright © 2026 HONEST SENSOR Version 1.1 2026-03-03 [email protected] www.h

HS40J (Preliminary) Encoder modules The HS40J encoder combines two magnetic sensing technologies to achieve true power-on multiturn position tracking. A GMR-based turn sensor monitors the movement of magnetic domain walls along a patterned nanowire structure. Each full rotation of the shaft’s magnet causes a deterministic shift in the magnetic state, allowing the module to accumulate turn counts even when power is off. For single-turn angle measurement, an AMR vector sensor detects the in-plane magnetic field and derives the shaft angle from the sine and cosine components of the field vector,...

HS40J (Preliminary)Encoder modules<GMR Turn-Count Reset Conditions & Methods> A reset of the multiturn magnetic counter is required after initial assembly or whenever the module reports an invalid turn-state condition (e.g., FAULT bit D9 or D13). Typical causes include incorrect magnetic domain transitions or mismatch between the stored turn state and the measured angle. The reset can be performed using either of the following methods: Rotate the shaft 46 full turns clockwise to drive the magnetic-domain pattern back to its reference state. 2. Magnetic Reset(optional tooling): Apply an external...

HS40J (Preliminary)Encoder modulesSPI TIMING DIAGRAMS ~v Figure 4. 32-bit write operation for 16-bit register Copyright © 2026 HONEST SENSOR Version 1.1 [email protected] www.honestsensor.com 4 / 22

HS40J (Preliminary)Encoder modulesSPI Interface & Timing • Mode: SPI Mode 0 (CPOL=0, CPHA=0), MSB-first • Frame: 32-bit read/write per 16-bit register. Multi-register burst is supported while CS is held low. Coherent position read (MANDATORY for synchronized data): Read ABSANGLE (0x03) and ANGLE (0x05) in one single SPI transaction while CS is held low (e.g., a 64-bit transaction built from two 32-bit read frames). Keeping CS low prevents the second register from being updated before it is read. Position outputs: - ABSANGLE (0x03) -> 16-bit multi-turn absolute position (0° to 16,560°) • Includes...

HS40J (Preliminary) Encoder modules _ Module Register Summary (for system integration) HS40J provides position and diagnostics through the following primary registers: - ABSANGLE (0x03, Read): 16-bit multi-turn absolute position (0° to 16,560°), with 10-bit intra-turn angle (0.3516°/LSB) - ANGLE (0x05, Read): 12-bit single-turn angle (0° to 360°), 0.0879°/LSB - FAULT (0x06, Read/Write): diagnostic flags (read 0xFFFF at power-up, then clear to 0x0000) For advanced configuration and calibration registers, refer to Appendix A. ABSANGLE Format & Interpretation ABSANGLE (0x03) reports the absolute...

HS40J (Preliminary) Encoder modules ● Ordering Information ● Setting Dimension Mounting Screw Size：M3 x 5mm Copyright © 2026 HONEST SENSOR Version 1.1 [email protected] www.honestsensor.com

HS40J (Preliminary) Encoder modules Axial assembly tolerance Radial assembly tolerance Concentric angle tolerance Copyright © 2026 HONEST SENSOR Version 1.1 [email protected] www.honestsensor.com

HS40J (Preliminary)Encoder modulesAppendix A - Advanced Register Descriptions This appendix contains detailed register maps and bit descriptions for advanced configuration and calibration. Typical system integration only needs the primary registers listed in the main body. The register map for the HS40J is split into pages. To access registers on a specific page, the appropriate page address must be written into the CNVPAGE register. The default (power-on-reset) value for each register is 0x0000, unless otherwise stated in Table 3. The CNVPAGE, ABSANGLE, DIGIO, ANGLE, and FAULT registers are...

Critical Configuration Registers ABSANGLE Format & Interpretation Refer to the ABSANGLE description in the main text (Module Register Summary section). No additional format differences apply. Primary vs Secondary Angle ANGLE (0x05) contains the fully-corrected primary angle. ANGLESEC (0x08) provides an independently-derived secondary angle for plausibility checking. The host should periodically compare ANGLE and ANGLESEC within a sufficiently short time interval and take appropriate action if the deviation exceeds the application-defined threshold. (Note: FAULT.D10 is reserved/not active.) CNV...

HS40J (Preliminary) Encoder modules 2. Trigger or abort a conversion sequence, setting the upper two bits of the CNVPAGE register to 0b00 will start a conversion sequence, setting 0b11 will abort a conversion sequence Table 4. Table4. Bit descriptions for the CNVPAGE register. Address: 0x05, Reset: 0x8000, Name: ANGLE This register stores the angle information with the offset, gain, phase, and harmonic corrections applied and provides an accurate 0° to 360° position. See the Copyright © 2026 HONEST SENSOR Version 1.1 2026-03-03 [email protected] www.honestsensor.com

HS40J (Preliminary)Encoder modules Sequencer section for details on when the angle register is updated. Angle Resolution = 360°/4096. Table 7. Bit descriptions for the ANGLE register. Copyright © 2026 HONEST SENSOR Version 1.1 [email protected] www.honestsensor.com