HV895

HV895 Liquid Lens Driver Features ► Drives capacitive loads up to 200pF ► Programmable drive amplitude (up to 60VRMS) ► On-chip boost converter ► No external inductor www.DataSheet4U.com ► I2C interface ► Low operating current (≤20mA) ► Low standby current (≤1.0µA) ► Controlled drive edge reduces EMI ► 1.0mm × 6.0mm flip-chip General Description The HV895 is designed to drive liquid lenses of up to 200pF with a 1.5kHz waveform at amplitudes up to 60VRMS, controlled via an I2C interface. A single byte (AMP) written to the HV895 controls the operation of the driver. Setting AMP = 01h to FFh controls output amplitude in 255 monotonic steps. Setting AMP = 00h causes the HV895 to go into low power standby mode, consuming less than 1.0µA. When active, the HV895 draws less than 20mA. A charge pump boost converter integrated on-chip provides the high voltage necessary for driving the lens. No external inductors or diodes are needed. Two ceramic 0402 size capacitors are the only external components required for a complete lens driver circuit. The narrow die size and only 2 small external components allow an entire lens driver circuit to be incorporated inside a camera module. An H-bridge output stage provides AC drive to the lens, allowing the use of a single high voltage boost converter while providing alternating polarity to the lens. Controlled rising and falling edges on the drive waveform reduces EMI. The HV895 is offered in a 1.0mm × 6.0mm lead-free solderbumped flip-chip. Appli...