AMIS305xx - Stepper Motor Driver now from ON Semiconductor
AMIS305xx - Stepper Motor Driver now from ON Semiconductor
The AMIS-305xx is a family of micro-stepping stepper motor driver for bipolar stepper motors. The ICs can be interfaced via I/O pins and the SPI bus to an external microcontroller.
As one member of the family, the AMIS-30522 contains a current translation table and takes the next micro-step on every rising (or falling) edge of the signal on the NXT input pin. The DIR register or input pin defines the direction of rotation. The IC provides a speed and load angle output signal. This in turn enables running on the external microcontroller stall detection algorithms and control loops based on load angle, and to adjust torque and speed accordingly. AMIS-30522 uses a proprietary PWM algorithm for reliable current control. Additionally, the AMIS-30522 has an on-chip voltage regulator, reset output and watchdog reset.
The AMIS-30522 is implemented in AMIS I2T100 technology, combining both high-voltage analog circuitry and digital functionality on the same IC. It complies with automotive requirements and is available in SOIC-EP-24 (exposed pad) as well as the compact, thermally enhanced 7x7 NQFP-32.
Features
Drivers and PWM current regulator:
- Dual H-Bridge for 2 phase stepper motors
- Programmable peak-current up to 1,6A using a 5-bit current DAC
- 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
Interface:
- SPI interface to external micro or DSP
- Speed and load information output enables sensor-less detection of stall or rotor position
- Next step input
- Full output protection and diagnosis
- Thermal warning and shut-down
- Compatible with 5 V and 3.3 V microcontrollers
Stepper:
- 7 step modes from full-step up to 32 micro-steps
Controller:
- On-chip current translator
Voltage Regulator:
- Integrated 5 V Regulator to supply external microcontroller
- Integrated Reset Function to reset external microcontroller
- Integrated Watchdog Function
Applications
- Intelligent positioning and dynamic motion of surveillance cameras and spotlights
- Dose pumps
- Vending machines
- Pick-and-place machines
- Automotive Headlight Position
- Dynamic motion of weaving and sewing equipment
- Flap/valve control in climate control facilities
