Part Number:DRV2605L
Hi,
We’re trying to get a bit more clarity around using the IN/TRIG pin to input a PWM signal to vary the amplitude of ERM drive strength using the DRV2605L.
I have a couple questions:
1) Is it possible to vary the amplitude of an ERM drive using PWM interface?
2) Is the last sentence of the first paragraph in section 8.3.5.1 below correct? Is this really applicable to standby mode? Can this mode be used with an ERM or is specific to an LRA?
3) Are there additional details around the appropriate register settings for the PWM input mode of operation?
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8.3.5.1 PWM Interface
When the DRV2605L device is in PWM interface mode, the device accepts PWM data at the IN/TRIG pin. The
DRV2605L device drives the actuator continuously in PWM interface mode until the user sets the device to
standby mode or to enter another interface mode. In standby mode, the strength of vibration is determined by the
duty cycle.
For the LRA, the DRV2605L device automatically tracks the resonance frequency unless the LRA_OPEN_LOOP
bit in register 0x1D is set. If the LRA_OPEN_LOOP bit is set, the LRA is driven according to the frequency of the
PWM input signal. Specifically, the driving frequency is the PWM frequency divided by 128.
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Thanks,
Sal