As non-contact position sensing becomes mainstream in human-machine interaction, 3D Hall-effect sensors serve as core components for knobs, joysticks and position sensing devices. The KTH5701 series low-power high-precision 3D Hall sensor from Kuntaixin Microelectronics supports 3-axis magnetic field acquisition with built-in CORDIC angle calculation. Only one single chip handles magnetic measurement, angle decoding and push-button detection, helping equipment simplify hardware design and cut BOM cost.
☑ True 3D 3-Axis Magnetic Field Detection
Integrated three independent X/Y/Z Hall sensing cells. Wide magnetic measurement range: ±130mT for XY axes and ±80mT for Z axis. Paired with a 16-bit high-precision ADC and on-chip temperature sensor for magnetic field temperature compensation.
?Tip: For angle output applications, the magnetic flux density of the two axes on the working plane is recommended to exceed 20mT to guarantee angle accuracy.
☑ Built-in CORDIC Hardware Algorithm for Direct Angle Output
Hardware accelerates angle calculation on XY / XZ / YZ planes. No trigonometric computation required from the MCU, which greatly saves main controller computing resources. Typical 360° rotation angle error: ±1°, delivering outstanding performance for knob rotation sensing. Magnetic field amplitude is also output, compatible with on-axis and off-axis knob structures.
☑ Flexible Multi-Mode Operation, Low Power for All Scenarios
Continuous Sensing Mode: High-speed continuous sampling for applications requiring frequent magnetic data reading;
Wake-Sleep Mode: Standby current as low as 2.4μA. An INT interrupt wakes up the MCU once magnetic field or angle variation exceeds the threshold, ideal for battery-powered devices for power saving;
Single-Shot Measurement Mode: On-demand measurement triggered by external pin pulse;
Idle Mode: Deep sleep standby with standby current of only 1.4μA.
☑ Integrated Button Detection: Knob + Button Functions in One Chip
Multiplexed BUTT_OUT/TRIG pin supports configurable magnetic threshold detection for button press. It combines knob rotation sensing and button triggering, eliminating extra mechanical buttons. This pin can also act as an external trigger input to start single-shot measurement.
☑ Dual Communication Interfaces & Rich Package Options
? Communication: Selectable SPI (Mode3, up to 5MHz) / I2C (400kHz); IO pins support 1.8V logic level, compatible with 3.3V / 5V host systems;
? Packages: QFN3×3‑16L, DFN2×2.5‑8L SMD packages;
? Temperature Grades: AQ2 Industrial Grade: -40℃ ~ +105℃; AQ3 Consumer Grade: -40℃ ~ +85℃;
? Wide Supply Voltage: 2.8V‑5.5V, suitable for industrial and consumer electronics power supplies.
Human-Machine Interface: Rotary knobs, game joysticks, encoders, home appliance control panels
Position Sensing: Linear position detection, 3D absolute position sensing, non-contact magnetic measurement
Industrial Equipment: Agricultural irrigation valve monitoring, industrial control panels
Low-Power Devices: Battery-powered magnetic encoders, angle sensing for portable equipment
| | |
| | Industrial Grade, -40~105℃ |
| | |
| | Industrial Grade, -40~105℃ |
| | |
Place a 0.1μF + 10μF decoupling capacitor combination close to the VDD and VDDIO power pins.
Unused BUTT_OUT/TRIG pins must be grounded. A0/A1 pins shall be grounded under SPI mode. NC no-connect pins are recommended to be grounded.
After power-up, wait 4ms for OTP initialization to complete before initiating communication.
The KTH5701 is a China-developed 3D Hall-effect sensor integrating 3-axis sampling, hardware angle calculation, button detection and low-power wake-up into a single die. It removes the need for external computation and reduces MCU load. With wide-temperature industrial variants, it covers both consumer electronics and industrial control. It is a cost-effective China-developed option for knob, joystick and non-contact position sensing projects.
0755-2810 2601 
+86 181 2402 2785 
marketing@junmintech.cn
