Using GreenPAK™ with low dropout regulators (LDOs) provides a fully customizable, low-power solution to drive and control a wide variety of small ERM motors used in devices such as mobile phones, game controllers, etc. The programmable digital and analog resources in GreenPAK make it easy to implement custom features to differentiate your haptic experience as well as protection features to ensure smooth and safe operation, including:
Using GreenPAK’s programmable digital and timing blocks it is possible to make a number of different vibration patterns. With the LDOs integrated into the GreenPAK, which can switch between two voltage outputs using digital logic and up to 32 different levels via I2C, it is also possible to create vibrations of different strengths.
Kickstart
Braking
Pattern and Kickstart Circuit in GreenPAK
Functional Waveforms
The LDOs in GreenPAK contain over-current and short circuit detection which will cause the LDO to shut down in the event of a failure. Additionally, using the integrated temperature sensor and programmable analog comparator (ACMP), it is easy to implement over-temperature shutdown as well.
Overcurrent & Short Protection LDO Settings
Over-temperature Protection Circuit in GreenPAK