Overview
The AMIS-30512C5122RG is a micro-stepping stepper motor driver designed by onsemi for bipolar stepper motors. This chip integrates a dual H-bridge configuration, enabling it to control two-phase stepper motors. It features a SPI interface for communication with an external microcontroller and includes an on-chip voltage regulator, reset output, and watchdog reset. The driver supports up to 32 micro-steps and provides a speed and load angle output, which is useful for stall detection and control loops. It is built using I2T100 technology, combining high-voltage analog circuitry and digital functionality on the same chip, making it suitable for various applications including automotive, industrial, medical, and marine environments.
Key Specifications
| Parameter | Min. | Typ. | Max. | Units | Remark/Test Conditions |
|---|---|---|---|---|---|
| VBB (Analog DC supply voltage) | -0.3 | 40 | V | For limited time < 0.5 s | |
| Tamb (Ambient temperature under bias) | -50 | 150 | °C | ||
| VDD (Regulated output voltage) | 4.75 | 5 | 5.25 | V | |
| IMDmax (Max current through motor coil) | 800 | mA | Tj < Tstd | ||
| fPWM (PWM frequency) | 20.8 | 22.8 | 24.8 | kHz | <PWMF> = 0 |
| Tj (Junction temperature) | 160 | °C |
Key Features
- Dual H-Bridge for 2-phase Stepper Motors
- Programmable Peak-current up to 800 mA using a 5-bit Current DAC
- On-chip Current Translator
- SPI Interface
- Speed and Load Angle Output
- Seven Step Modes from Full-step up to 32 Micro-steps
- Fully Integrated Current-sense
- PWM Current Control with Automatic Selection of Fast and Slow Decay
- Low EMC PWM with Selectable Voltage Slopes
- Active Fly-back Diodes
- Full Output Protection and Diagnosis
- Thermal Warning and Shutdown
- Compatible with 3.3 V Microcontrollers, 5 V Tolerant Inputs
- Integrated 5 V Regulator to Supply External Microcontroller
- Integrated Reset Function to Reset External Microcontroller
- Integrated Watchdog Function
Applications
The AMIS-30512C5122RG is ideally suited for general-purpose stepper motor applications in various environments, including:
- Automotive
- Industrial
- Medical
- Marine
Q & A
- What is the maximum current the AMIS-30512C5122RG can handle through the motor coil?
The maximum current through the motor coil is 800 mA.
- What is the operating voltage range for the VBB supply?
The operating voltage range for VBB is from 6 V to 30 V.
- What communication interface does the AMIS-30512C5122RG use?
The AMIS-30512C5122RG uses a SPI interface for communication with an external microcontroller.
- How many micro-step modes does the AMIS-30512C5122RG support?
The AMIS-30512C5122RG supports seven step modes from full-step up to 32 micro-steps.
- Does the AMIS-30512C5122RG have integrated current sensing?
Yes, the AMIS-30512C5122RG has fully integrated current-sense.
- What is the purpose of the speed and load angle output?
The speed and load angle output allows for the creation of stall detection algorithms and control loops based on load-angle to adjust torque and speed.
- Is the AMIS-30512C5122RG compatible with 3.3 V microcontrollers?
Yes, the AMIS-30512C5122RG is compatible with 3.3 V microcontrollers and has 5 V tolerant inputs.
- Does the AMIS-30512C5122RG have thermal protection features?
Yes, it includes thermal warning and shutdown features.
- What package type is the AMIS-30512C5122RG available in?
The AMIS-30512C5122RG is available in a SOIC-24 package.
- What is the maximum junction temperature for the AMIS-30512C5122RG?
The maximum junction temperature is 160°C.
