CAM622

CAM622 Resonant Inductive Encoder IC (SPI,ABN,BiSS,SENT) for Type B Sensors

CambridgeIC’s CAM622 is a Resonant Inductive Encoder IC.  It connects to a host device over SPI, quadrature ABN, BiSS or SENT interfaces.

The CAM622 connects to an external Type B Rotary Sensor or Type B Linear Sensor and detects the position of a contactless resonant inductive Type B Rotary Target or Type B Linear Target.  Type B sensors and targets are made from PCBs.  They include coil patterns for resonant inductive sensing.  The coil patterns are available from CambridgeIC, so customers can manufacture the parts themselves and integrate them with their product.  The CAM622 works with a variety of different sensor and target sizes.

Features

• Works with CambridgeIC’s “Type B” sensor PCBs
• Fully ratiometric Sensing Engine
• Automatic tuning to target frequency
• Optional adaptive filter for extra resolution
• Filter can be configured for zero phase delay
• Encoder style ABN outputs with True Edge Timing
• ABN interface is absolute at start-up with NSTART set to 1
• BiSS support, uses an external iC-MB device from iC-Haus
• SPI or BiSS for configuration or reading results
• Latch Point Compensation for zero phase delay reading SPI or BiSS
• SENT interface for low-cost automotive interfacing
• Internal software upgradable over SPI
• Exceptionally stable across temperature

Performance

• Up to 33 kHz internal measurement rate
• Up to 125 kHz position update rate over SPI
• Up to 60 kHz position update rate over BiSS
• Latch Point Compensation timing accuracy < 2 µs for SPI and BiSS
• AB cycles/rev configurable up to 16384 (rotary) – that means 65536 positions/rev
• AB edge resolution down to 2 μm (linear B6, 15000 AB cycles/rev)
• Tested at 66000 rpm with 25 mm B3 Rotary Sensor (1000 AB cycles/rev)
• AB edge rate up to 4,5 MHz (e.g. 4170 rpm max at 16384 AB cycles/rev)
• Resonator frequency tuning range ±8%
• Output stable to within 0,01° across temperature range -40°C to +125°C with 25 mm B3 Rotary Sensor