magnetic rotary position sensor AMS AS5045 with contactless operation and immunity to magnetic stray fields
Product Overview
The AS5045 is a 12-bit programmable magnetic rotary position sensor designed for accurate angular measurement over a full 360 turn. This system-on-chip integrates Hall elements, analog front end, and digital signal processing. It requires only a simple two-pole magnet for operation, offering contactless absolute angle measurement with a resolution of 0.0879 (4096 positions per revolution). The digital data is available via a serial bit stream or a PWM signal. The device supports both 3.3V and 5V supplies due to an internal voltage regulator. Key benefits include high reliability in harsh environments, contactless operation, user-programmable zero position, diagnostic modes, and immunity to external magnetic stray fields. Applications include robotics, stepper motor control, RC servo control, and as a replacement for high-end potentiometers.
Product Attributes
- Brand: ams OSRAM
- Part Number: AS5045
- Package: SSOP-16 (Pb-free)
Technical Specifications
| Parameter | Min | Typ | Max | Units | Conditions |
|---|---|---|---|---|---|
| Ambient Temperature | -40 | 125 | C | ||
| Supply Current (IsUPP) | 16 | 21 | mA | ||
| Supply Voltage (VDD5V) | 4.5 | 5.0 | 5.5 | V | 5V operation |
| Regulator Output Voltage (VDD3V3) | 3.0 | 3.3 | 3.6 | V | |
| Supply Voltage (VDD5V) | 3.0 | 3.3 | 3.6 | V | 3.3V operation (VDD5V and VDD3V3 connected) |
| High Level Input Voltage (VIH) | 0.7 * VDD5V | V | CMOS Schmitt-Trigger Inputs (CLK, CSn) | ||
| Low Level Input Voltage (VIL) | 0.3 * VDD5V | V | CMOS Schmitt-Trigger Inputs (CLK, CSn) | ||
| Schmitt Trigger Hysteresis (VIon-VIoff) | 1 | V | |||
| Input Leakage Current (ILEAK) | -1 | 1 | A | CLK only | |
| High Level Input Current (IIL) | -30 | -100 | A | CSn only, VDD5V: 5.0V | |
| High Level Input Voltage (VIH) | 0.7 * VDD5V | VDD5V | V | CMOS / Program Input (Prog) | |
| Low Level Input Voltage (VIL) | 0.3 * VDD5V | V | CMOS / Program Input (Prog) | ||
| High Level Input Current (IIL) | 30 | 100 | A | Prog, VDD5V: 5.5V | |
| Low Level Output Voltage (VOL) | VSS+0.4 | V | CMOS Output Open Drain (MagINCn, MagDECn) | ||
| Output Current (IO) | 4 | mA | VDD5V: 4.5V (MagINCn, MagDECn, PWM, DO) | ||
| Output Current (IO) | 2 | mA | VDD5V: 3V (MagINCn, MagDECn, PWM, DO) | ||
| Open Drain Leakage Current (IOZ) | 1 | A | MagINCn, MagDECn | ||
| High Level Output Voltage (VOH) | VDD5V- 0.5 | V | CMOS Output (PWM, DO) | ||
| Tri-state Leakage Current (IOZ) | 1 | A | DO | ||
| Magnet Diameter (dmag) | 4 | 6 | mm | Recommended magnet: 6mm x 2.5mm | |
| Magnet Thickness (tmag) | 2.5 | mm | |||
| Magnetic Input Field Amplitude (BPK) | 45 | 75 | mT | Required vertical component on die's surface, radius 1.1mm | |
| Magnetic Offset (BOFF) | 10 | mT | Constant magnetic stray field |
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