Reference Designs
Universal Digital Interface to Absolute Position Encoders Reference Design
Texas Instruments
TIDA-00179 is an EMC-compliant universal digital interface to connect to absolute position encoders like EnDat 2.2: BiSS®: SSI or HIPERFACE DSL®. This reference design supports a wide-input voltage range from 15 V to 60 V (24-V nom). A connector with 3.3-V logic I/O signals allows for direct interface to the host processor like Sitara AM437x or Delfino F28379 to run the corresponding master protocol.Master implementations are available on Sitara AM437x (EnDat2.2: BiSS and HIPERFACE DSL) or Delfino DesignDRIVE (EnDat2.2 and BiSS). This design allows the host processor to select between a 4-wire encoder interface like EnDat 2.2 and BiSS or a 2-wire interface with power over RS-485 like HIPERFACE DSL. To meet the selected encoder's supply range: the design offers a programmable output voltage with either 5.25 V or 11 V. The design's power supply offers protection against over-voltage and short circuit according to the selected encoder's voltage range to prevent damage during a cable short. TIDA-00179 has been tested up to 100-m cable length with EnDat 2.2 and 2-wire HIPERFACE DSL encoders.
Features
- Universal hardware to interface to EnDat 2.2: BiSS: SSI and 4-wire or 2-wire HIPERFACE DSL encoders. It supports all corresponding standard data rates up to at least 100-m cable length.3.3-V supply half-duplex RS-485 transceiver SN65HVD78 with 12-kV IEC-ESD and 4-kV EFT eliminates cost for external ESD components.Encoder P/S with wide input range (15 V to 60 V) offers programmable output voltage 5.25 V or 11 V: Compliant to EnDat 2.2: BiSS or HIPERFACE DSL encodersOV: UV and precise over-current limit with short-circuit protection leveraging TI eFuse Technology with current monitor and fault indicatorLogic interface (3.3-V I/O) to host processors like Sitara AM437x or Delfino F28379 to run the EnDat 2.2: BiSS: SSI or HIPERFACE DSL master. Master implementations are available on Sitara AM437x (EnDat2.2: BiSS and HIPERFACE DSL) or Delfino DesignDRIVE (EnDat2.2 and BiSS).Design exceeds EMC immunity for ESD: fast-transient burst and surge and conducted RF with levels according to IEC61800-3.
Applications
- Closed loop stepper
- Digital input module
- HVAC controller
- Telemetry & RTUs
- Motor diagnostics & monitoring
- Servo drive position feedback
- Flight control unit
- Mixed module (AI
- AO
- DI
- DO)
- Servo drive control module
- Traction inverter motor control
- HVAC motor control
- HVAC valve & actuator control
- AC drive position feedback
- Stand-alone remote IO
- Servo drive position sensor
- Condition monitoring module
- Servo drive functional safety module
- Commutation sensor
- 2-wheeler & 3-wheeler traction drive
- Injection molding machine
- Robot servo drive
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- Interface
End Equipment Reference Diagrams
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End Equipment