JAJSSJ5 December 2023 DRV8234
PRODUCTION DATA
In applications such as electronic locks and gas valves, it may be required to identify the rotor position or speed of the brushed-DC motor to implement a variety of different functions at the system level. Most systems implement position or speed detection using encoders, limit switches or Hall sensors.
The DRV8234 supports an integrated Ripple counting algorithm to estimate motor position and speed without using any external sensors such as an encoder or a Hall sensor. This enables reduction in system BOM count, BOM cost, and design complexity.
Ripple counting with integrated stall detection allows increased system reliability. For example, in a gas valve system, although the timing of stall detection may change due to changes in temperature and gas pressure, the number of ripples before stall will be same for each actuation. If a stall occurs, but the number of ripples is less than the target value, then this may indicate a loss of position, for example due to a jammed valve.
To enable the ripple counting feature, set EN_RC to 1b.