FAH4830 View Datasheet(PDF) - Fairchild Semiconductor

Part Name

Description

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FAH4830

Haptic Driver for DC Motors (ERMs) and Linear Resonant Actuators (LRAs)

Fairchild Semiconductor 

Applications Information

The FAH4830 has the external PWM input pin for the

motor driver block. In ERM Mode, the device uses the

39 nF external capacitor as an integrator. This converts

the PWM output to differential DC levels on the

MDP / MDN outputs.

In the LRA Mode, to control the 10 kHz to 50 kHz

frequency range of the PWM input signal; the device

incorporates an internal clock-dividing feature that can

be modified via the I2C register settings. This allows the

user flexibility to obtain the correct resonant frequency

for the chosen LRA device.

The input signal’s duty cycle changes the amplitude of

the positive and negative outputs for the motor drive.

The LRA and ERM motor vibration strength depends on

the PWM duty cycle. When the duty cycle is 50/50, the

device stops. The vibration is maximum when the duty

ratio is 1% to 99% or 99% to 1%. The regulator voltage

level controls the amplitude of the signal at the motor.

Figure 9. LRA Motor Drive (MDN, MDP)

Figure 10. System Block Diagram

© 2012 Fairchild Semiconductor Corporation

FAH4830 • 1.0.1

10

www.fairchildsemi.com

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