TI's TIDA-01421 is a automotive brushed motor pulse counter reference design for sensorless position measurement. It can be configured for many DC motor solutions with a common mode input range of -14V to 80V and an operating voltage of 9-18V. The working pulse frequency range is 100Hz-1.3kHz, the motor maximum current is +/-16A, and the MSP430TM LaunchPadTM development board has a simple interface. It is a high-precision test solution. It is mainly used in memory seats, electric windows, side mirrors, elevators. Door and power box. This article introduces the main features of TIDA-01421, block diagram, and MSP-EXP430FR6989 LaunchPadTM connection diagram and circuit diagram, bill of materials and PCB design.
The demand to retain memory on the posiTIon of theseat, window, sliding door, mirror, lift-gate, and othersdriven by that motor has increased as small motorswithin the modern automotive vehicle continue toevolve. Existing solutions utilize multiple magnetic sensorss attached to the body of a Motor to provide a feedback loop to the motor control module.
A sensorless approach provides redundancy forexisting solutions and, in some cases, removes therequirement for motors with sensors attached. The sensorless approach has become interested popularthrough the implementation of an in-line, current-sense signal-conditioning circuit. This design provides a solution that is easily Modifiable for many automotivemotor systems that control position measurement.
Motor position memory is being applied in more areas of the automotive vehicle including configuration and comfort settings for different driver profiles as well as diagnostics for more efficient and smartercontrol of the motor. The demand for more cost-efficient and easily-configurable solutions for manydifferent motor types Has increased. For example, the seats in a vehicle can feature many axes of movement and ergonomic adjustment all controlled by individual motors. Existing memory solutions forthese seats require motors with magnetic Hall-effect sensors plus the additional extra wiring for each sensor. The requirement for this many sensors and wiring bysensing the in-line motor current at the seat control module itself.
A sensorless approach is possible for brushed DC motors due to the effect that the back-electromagneticforce (BEMF) has on the motor current seen entering the motor. As the motor rotates, the impedanceseen by the BEMF periodically changes due to the nature of the DC Motor brushes making contact with multiple poles of the motor and effectively shorting some of the motor windings. This change in impedance changes the measured current in a very periodic pattern proportional to the actual speed of the motor.
This system provides a way to measure this varying in-line motor current, filter and condition the resultantsignal, then provide a 3.3-V digital logic level series of rising and falling edges for a digital processor tocount and analyze for accuracy and feedback to the main With controllers with some simple changes incurrent sense resistor values, gain settings, and filter bandwidths, this solution can quickly be modified for use with many small motor systems.
Main features of TIDA-01421:
• Configurable for Many DC Motor Solutions
• Wide Common Mode Input Range for In-line MotorCurrent Sensing
• Operational for Typical 9-V to 18-V Battery Supply
• Simple Interfacing With MSP430TM LaunchPadTM Development Kit for Interfacing and Digital Capture
• Highly Accurate Test Solution
TIDA-01421 application:
• Memory Seats
• Power Windows
• Lift Gate and Power Trunk
• Side Mirrors
The main indicators of TIDA-01421 system:
Figure 1. Outline design of the reference design TIDA-01421
TIDA-01421 Automotive Brushed-Motor Ripple Counter Reference Design for Sensorless Position Measurement Board Image
Figure 2. Block diagram of the reference design TIDA-01421
Figure 3. Reference Design TIDA-01421 PCB Top 3D Perspective
Figure 4. Reference design TIDA-01421 and MSP-EXP430FR6989 LaunchPadTM connection diagram
Figure 5. Reference design TIDA-01421 circuit diagram
Refer to the design TIDA-01421 bill of materials:
Figure 6. Reference Design TIDA-01421 PCB Design Drawing (1)
Figure 7. Reference Design TIDA-01421 PCB Design Drawing (2)
Figure 8. Reference Design TIDA-01421 PCB Design Drawing (3)
Figure 9. Reference Design TIDA-01421 PCB Design Drawing (4)
Figure 10. Reference Design TIDA-01421 PCB Design Drawing (5)
Figure 11. Reference Design TIDA-01421 PCB Design Drawing (6)
Figure 12. Reference Design TIDA-01421 PCB Design Drawing (7)
Figure 13. Reference Design TIDA-01421 PCB Design Drawing (8)
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