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Global environmental demands and regional legislations are enforcing the automotive industry to dramatically reduce harmful exhaust emissions and this is forcing a shift away from the conventional combustion engines to Hybrid and Full electric E-motor drive vehicles. The efficient and smooth control of these e-motors is critical to ensuring the maximum drive range is achieved. ADI's AMR magnetic shaft position sensors provide the precision, fast response and robustness needed to achieve these goals. Depending on your system design, you can also achieve the highest level of safety and performance with road proven ADI's resolver to digital converter (RDC) solutions.
Featured Products
AD2S1210
Variable Resolution, 10-Bit to 16-Bit R/D Converter with Reference OscillatorX+
The AD2S1210 is a complete 10-bit to 16-bit resolution tracking resolver-to-digital converter, integrating an on-board programmable sinusoidal oscillator that provides sine wave excitation for resolvers.
The converter accepts 3.15 V p-p ± 27% input signals, in the range of 2 kHz to 20 kHz on the sine and cosine inputs. A Type II servo loop is employed to track the inputs and convert the input sine and cosine information into a digital representation of the input angle and velocity. The maximum tracking rate is 3125 rps.
The AD2S1210WDSTZ and the AD2S1210WDSTZRL7 models have been approved by an independent accredited body for use in Automotive Safety Integrity Level B rated applications according to ISO 26262. Contact your local Analog Devices, Inc., sales office to obtain a copy of the safety manual and ASIL B safety assessment certificate.
PRODUCT HIGHLIGHTS
Ratiometric tracking conversion. The Type II tracking loop provides continuous output position data without conversion delay. It also provides noise immunity and tolerance of harmonic distortion on the reference and input signals.
System fault detection. A fault detection circuit can sense loss of resolver signals, out-of-range input signals, input signal mismatch, or loss of position tracking. The fault detection threshold levels can be individually programmed by the user for optimization within a particular application.
Input signal range. The sine and cosine inputs can accept differential input voltages of 3.15 V p-p ± 27%.
Programmable excitation frequency. Excitation frequency is easily programmable to a number of standard frequencies between 2 kHz and 20 kHz.
Triple format position data. Absolute 10-bit to 16-bit angular position data is accessed via either a 16-bit parallel port or a 4-wire serial interface. Incremental encoder emulation is in standard A-quad-B format with direction output available.
Digital velocity output. 10-bit to 16-bit signed digital velocity
accessed via either a 16-bit parallel port or a 4-wire serial interface.
The AD2S1205 is a complete 12-bit resolution tracking resolver-to-digital converter that contains an on-board programmable sinusoidal oscillator providing sine wave excitation for resolvers.
The converter accepts 3.15 VP-P ± 27% input signals on the Sin and Cos inputs. A Type II tracking loop is employed to track the inputs and convert the input Sin and Cos information into a digital representation of the input angle and velocity. The maximum tracking rate is a function of the external clock frequency. The performance of the AD2S105 is specified across a frequency range of 8.192 MHz ± 25%, allowing a maximum tracking rate of 1250 rps.
PRODUCT HIGHLIGHTS
Ratiometric Tracking Conversion. The Type II tracking loop provides continuous output position data without conversion delay. It also provides noise immunity and tolerance of harmonic distortion on the reference and input signals.
System Fault Detection. A fault detection circuit can sense loss of resolver signals, out-of-range input signals, input signal mismatch, or loss of position tracking.
Input Signal Range. The Sin and Cos inputs can accept differential input voltages of 3.15 VP-P ± 27%.
Programmable Excitation Frequency. Excitation frequency is easily programmable to 10 kHz, 12 kHz, 15 kHz, or 20 kHz by using the frequency select pins (the FS1 and FS2 pins).
Triple Format Position Data. Absolute 12-bit angular position data is accessed via either a 12-bit parallel port or a 3-wire serial interface. Incremental encoder emulation is in standard A-quad-B format with direction output available.
Digital Velocity Output. 12-bit signed digital velocity accessed via either a 12-bit parallel port or a 3-wire serial interface.
The ADA4571 is an anisotropic magnetoresistive (AMR) sensor
with integrated signal conditioning amplifiers and ADC drivers.
The ADA4571 produces two analog outputs that indicate the
angular position of the surrounding magnetic field.
The ADA4571 consists of two die within one package, an AMR
sensor, and a fixed gain (G = 40 nominally) instrumentation
amplifier. The ADA4571 delivers clean and amplified cosine
and sine output signals related to the angle of a rotating
magnetic field. The output voltage range is ratiometric to the
supply voltage.
The sensor contains two Wheatstone bridges, at a relative angle
of 45° to one another. A rotating magnetic field in the x-y
sensor plane delivers two sinusoidal output signals with the
double frequency of the angle (α) between sensor and magnetic
field direction. Within a homogeneous field in the x-y plane,
the output signals are independent of the physical placement in
the z direction (air gap).
The ADA4571 is available in an 8-lead SOIC package.
Product Highlights
Contactless angular measurement.
Measures magnetic field direction rather than field intensity.
Minimum sensitivity to air gap variations.
Large working distance.
Excellent accuracy, even for weak saturation fields.
The ADA4571-2 is a 2-channel anisotropic magneto resistive (AMR) sensor with integrated signal conditioning amplifiers
and ADC drivers. The device produces analog outputs that indicate the angular position of the surrounding magnetic field.
Each channel consists of two die within one package: an AMR sensor and a variable gain instrumentation amplifier. The ADA4571-2 delivers clean and amplified cosine and sine output signals per channel related to the angle of a rotating magnetic field. The output voltage range is ratiometric to the supply voltage.
Each sensing channel contains two separated wheatstone bridges at a relative angle of 45° to one another. A rotating magnetic field parallel to the plane of the IC package delivers two sinusoidal output signals, with the double frequency of the angle, α, between the sensor and the magnetic field direction. Within a homogeneous field parallel to the plane of the IC package, the output signals are independent of airgap between the sensor and the magnet.
The ADA4571-2 is available in a 16-lead SOIC package.
Product Highlights
Contactless angular measurement.
Measures magnetic field direction rather than field intensity.
Minimum sensitivity to air gap variations.
Large working distance.
Excellent accuracy, even for weak saturation fields.
Minimal thermal and lifetime drift.
Negligible hysteresis.
Single-chip solution.
Applications
Permanent magnet synchronous motor (PMSM) control and positioning
Automotive SENT Interface-Based Thermocouple Temperature Sensor with Cold Junction Compensation Using the ADuC7060/ADuC7061 Precision Analog MicrocontrollerX+
This circuit uses the ADuC7060 or the ADuC7061 precision analog microcontroller in an accurate thermocouple temperature monitoring application. The ADuC7060/ADuC7061 integrate dual 24-bit sigma-delta (Σ-Δ) analog-to-digital converters (ADCs), dual programmable current sources, a 14-bit digital-to-analog converter (DAC), and a 1.2 V internal reference, as well as an ARM7 core, 32 kB flash, 4 kB SRAM, and various digital peripherals such as UART, timers, serial peripheral interface (SPI), and I2C interfaces.
In the circuit, the ADuC7060/ADuC7061 are connected to a thermocouple and a 100 Ω platinum resistance temperature detector (RTD). The RTD is used for cold junction compensation. As an extra option, the ADT7311 digital temperature sensor can be used to measure the cold junction temperature instead of the RTD.
In the source code, an ADC sampling rate of 4 Hz was chosen. When the ADC input programmable gain amplifier (PGA) is configured for a gain of 32, the noise-free code resolution of the ADuC7060/ADuC7061 is greater than 18 bits.
The single edge nibble transmission (SENT) interface to the host is implemented by using a timer to control a digital output pin. This digital output pin is then level shifted externally to 5 V using an external NPN transistor. An EMC filter is provided on the SENT output circuit as recommended in Section 6.3.1 of the SENT protocol (SAE J2716 Standard). The data is measured as falling edge to falling edge, and the duration of each pulse is related to the number of system clock ticks. The system clock rate is determined by measuring the SYNC pulse. The SYNC pulse is transmitted at the start of every packet. More details are provided in the SENT Interface section.
Figure 1. ADuC7060/ADuC7061 as a Temperature Monitor Controller with a Thermocouple Interface (Simplified Schematic, All Connections Not Shown)
