Inductive Position Sensor IC IPS2550 Datasheet Description Features The IPS2550 is a magnet-free, inductive position sensor IC that Position sensing based on an inductive principle can be used for high-speed absolute position sensing in auto- Cost-effective no magnet required motive, industrial, medical, and consumer applications. The Immune to magnetic stray fields no shielding required IPS2550 uses the physical principle of eddy currents to detect the Suitable for harsh environments and extreme temperatures position of a simple metallic target that is moving above a set of coils, consisting of one transmitter coil and two receiver coils. Differential and single-ended sine and cosine outputs Automatic gain control with programmable limits The three coils are typically printed as copper traces on a printed circuit board (PCB). They are arranged such that the transmitter Nonvolatile user-configurable memory, programmable via I2C coil induces a secondary voltage in the two receiver coils, which interface depends on the position of the metallic target above the coils. Programmable through analog or digital interface A signal representative of the targets position over the coils is Single IC supports on-axis and off-axis rotation, linear motion, obtained by demodulating and processing the secondary voltages and arc motion sensing from the receiver coils. The target can be any kind of metal, such Adaptable to any full-scale angle range through coil design as aluminum, steel, or a PCB with a printed copper layer. High accuracy: 0.1% full scale (with ideal coils) The IPS2550 provides two independent output interfaces: Rotation sensing up to a 360 angle range A high-speed analog interface providing position information Over-voltage and reverse-polarity protection: in the form of demodulated analog sine/cosine raw data 18V on both supply and output pins An I2C digital interface for diagnostics and programming Facilitates redundant design requirements The IPS2550 operates at rotation speeds up to 600000 RPM Suitable for implementation in safety-related systems (relating to coil designs using 1 period per turn). An ultra-low propa- compliant to ISO26262 up to ASIL-C on a single IC and gation delay of 4s provides high dynamic control for fast spinning ASIL-D on dual ICs motors. Fast diagnostic alarm via interrupt pin The IPS2550 has been developed according to ISO26262 for Wide operation temperature: -40 C up to +160C implementation in safety-relevant systems up to ASIL C for a single Supply voltage programmable for 3.3V10% or 5.0V10% IC and ASIL D for dual, redundant ICs. It is available in a 16-pin Small 16-TSSOP exposed pad package (4.4mm 5.0mm) exposed pad TSSOP package and qualified for automotive use at -40C to +160C ambient temperature. Application Circuit Example Available Support Renesas provides reference designs that demonstrate IPS2550 1 16 rotary position sensing applications. ADR IRQN SDA 2 15 RX1 SCL Rx Typical Applications (sin) 3 RX2 14 Rotor position detection for brushless DC motors adaptable SIN SCL 4 13 to any pole pair count RX3 SINN Rx 12 Replacement of resolvers (cos) 5 COS SDA RX4 11 COSN 6 TX1 Tx 3.3V / 5V CT 10 7 VDD TX2 C VDD 9 8 GND VDDA CVA 2022 Renesas Electronics Corporation 1 March 11, 2022 IPS2550IPS2550 Datasheet Contents 1. Pin Assignments ...........................................................................................................................................................................................5 2. Pin Descriptions ............................................................................................................................................................................................5 3. Receiver Coil Connection Options ................................................................................................................................................................7 4. Absolute Maximum Ratings ..........................................................................................................................................................................9 5. Operating Conditions ....................................................................................................................................................................................9 6. Ambient Temperature Range .....................................................................................................................................................................11 7. Electrical Characteristics ............................................................................................................................................................................12 8. Circuit Description ......................................................................................................................................................................................20 8.1 Overview ............................................................................................................................................................................................20 9. Sampling Rate, Resolution, Output Data Rate, and Propagation Delay .....................................................................................................22 10. Output Modes .............................................................................................................................................................................................23 11. Operating at High Speed ............................................................................................................................................................................23 12. Digital Diagnostics and Programming Interfaces ........................................................................................................................................24 13. Block Diagram ............................................................................................................................................................................................25 14. Detailed Block Descriptions ........................................................................................................................................................................26 14.1 Power Management ..........................................................................................................................................................................26 14.2 LC Oscillator ......................................................................................................................................................................................26 14.3 Analog Signal Path ............................................................................................................................................................................26 14.3.1 Rx Coil Diagnostics ............................................................................................................................................................26 14.3.2 Receiver Signal Low-Pass Filter .........................................................................................................................................26 14.3.3 Offset and Gain Matching ...................................................................................................................................................26 14.3.4 Demodulation .....................................................................................................................................................................26 14.3.5 Automatic Gain Control (AGC) ...........................................................................................................................................27 14.4 Signal Channel Swapping .................................................................................................................................................................27 14.5 Output Buffers ...................................................................................................................................................................................27 14.6 Temperature Sensor ..........................................................................................................................................................................27 15. ECU Connection Options ...........................................................................................................................................................................28 15.1 Embedded vs. Remote Connection ...................................................................................................................................................28 15.2 Supply Voltage Operation: 3.3V or 5V ...............................................................................................................................................30 15.3 I2C Interface ......................................................................................................................................................................................30 15.3.1 I2C with Address Selection (Default) ..................................................................................................................................30 15.3.2 Avoiding a Parasitic Path through ADR IRQN Pin during Loss of GND or Loss of VDD ...................................................31 15.3.3 I2C Interface with Interrupt (Programming Option) .............................................................................................................32 16. Over-Voltage Protection .............................................................................................................................................................................33 16.1 I/O Protection .....................................................................................................................................................................................33 17. Programming Options .................................................................................................................................................................................33 17.1 Programming the Device to Use the Other Supply Voltage Option ...................................................................................................35 17.2 Lock Feature (Cyber Security) ...........................................................................................................................................................35 2022 Renesas Electronics Corporation 2 March 11, 2022