Overview
The DRV5055A3QDBZR is a ratiometric linear Hall effect sensor produced by Texas Instruments. This device is designed to respond proportionally to magnetic flux density, making it suitable for accurate position sensing in a wide range of applications. It operates from either 3.3-V or 5-V power supplies and provides an analog output that is referenced to VCC, with a quiescent offset of VCC / 2. The DRV5055A3QDBZR features fully integrated signal conditioning, temperature compensation circuits, mechanical stress cancellation, and amplifiers, ensuring reliable and precise measurements across a temperature range of –40°C to 125°C.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| VCC (Power-supply voltage) | 3 | - | 5.5 | V |
| Operating Ambient Temperature (TA) | –40 | - | 125 | °C |
| Operating Supply Current (ICC) | 6 | 10 | - | mA |
| Power-on Time (tON) | 175 | 330 | - | µs |
| Sensing Bandwidth (fBW) | - | 20 | - | kHz |
| Propagation Delay Time (td) | 10 | - | - | µs |
| Sensitivity (S) at VCC = 3.3 V | 14.3 | 15 | 15.8 | mV/mT |
| Sensitivity (S) at VCC = 5 V | 23.8 | 25 | 26.2 | mV/mT |
| Linear Magnetic Sensing Range (BL) at VCC = 3.3 V | ±88 | - | - | mT |
| Linear Magnetic Sensing Range (BL) at VCC = 5 V | ±85 | - | - | mT |
| Quiescent Voltage (VQ) at VCC = 3.3 V | 1.59 | 1.65 | 1.71 | V |
| Quiescent Voltage (VQ) at VCC = 5 V | 2.43 | 2.5 | 2.57 | V |
Key Features
- Ratiometric Architecture: Eliminates error from VCC tolerance when the external analog-to-digital converter (ADC) uses the same VCC for its reference.
- Temperature Compensation: Includes magnet temperature compensation to counteract magnet drift, ensuring linear performance across a wide temperature range.
- Multiple Sensitivity Options: Four sensitivity options (DRV5055A1 to DRV5055A4) to maximize output voltage swing based on the required sensing range.
- Analog Output: Provides an analog output that is proportional to the applied magnetic flux density, with a quiescent offset of VCC / 2.
- Low Noise: Features low output-referred noise, which can be further reduced with an RC filter if the full device bandwidth is not needed.
- Compact Packages: Available in SOT-23 (DBZ) and TO-92 (LPG) packages, offering different sensing directions.
Applications
- Fluid Flow Rate Measurement: Can be used to measure fluid flow rates by detecting the magnetic field generated by a magnet attached to a flow meter.
- Medical Devices: Suitable for use in medical devices due to its high accuracy and reliability.
- Absolute Angle Encoding: Used in applications requiring precise angle measurement, such as in robotics and industrial automation.
- Current Sensing: Can be employed for current sensing by detecting the magnetic field generated by current flow.
Q & A
- What is the operating voltage range of the DRV5055A3QDBZR?
The DRV5055A3QDBZR operates from 3.3-V to 5-V power supplies, with two recommended ranges: 3 V to 3.63 V and 4.5 V to 5.5 V.
- What is the quiescent voltage of the DRV5055A3QDBZR?
The quiescent voltage is VCC / 2. For example, at VCC = 3.3 V, the quiescent voltage is approximately 1.65 V, and at VCC = 5 V, it is approximately 2.5 V.
- What are the key features of the DRV5055A3QDBZR's temperature compensation?
The device includes magnet temperature compensation to counteract magnet drift, ensuring linear performance across a wide temperature range of –40°C to 125°C.
- What are the available package options for the DRV5055A3QDBZR?
The device is available in SOT-23 (DBZ) and TO-92 (LPG) packages, offering different sensing directions.
- How does the DRV5055A3QDBZR handle noise?
The device features low output-referred noise, which can be further reduced with an RC filter if the full device bandwidth is not needed.
- What is the sensitivity of the DRV5055A3QDBZR?
The sensitivity of the DRV5055A3QDBZR is 15 mV/mT at VCC = 3.3 V and 25 mV/mT at VCC = 5 V.
- What is the linear magnetic sensing range of the DRV5055A3QDBZR?
The linear magnetic sensing range is ±88 mT at VCC = 3.3 V and ±85 mT at VCC = 5 V.
- How does the DRV5055A3QDBZR's ratiometric architecture benefit the application?
The ratiometric architecture eliminates error from VCC tolerance when the external ADC uses the same VCC for its reference.
- What are some common applications of the DRV5055A3QDBZR?
Common applications include fluid flow rate measurement, medical devices, absolute angle encoding, and current sensing.
- What is the propagation delay time of the DRV5055A3QDBZR?
The propagation delay time is approximately 10 µs from the change in magnetic flux density to the change in output voltage.
