HV895 Datasheet | Supertex

Features - Drives capacitive loads up to 200p F - Programmable drive amplitude (up to 60VRMS) - On-chip boost converter - No external inductor .. - I2C interface - Low operating current (≤20m A) - 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 200p F with a 1.5k Hz 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 20m A. 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 ponents required for a plete lens driver circuit. The narrow die size and only 2 small external ponents 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. Applications - - - - - Cell phone and PDA cameras Bar code readers Web and laptop cameras Biometric scanners Ultrapact cameras Typical Application Circuit I2C bus VDD 1.7 -2.95V VD D OUT1 SDA SCL OUT2 HV GND1 GND2 Liquid Lens 100 -200p F VIN 2.65 - 5.5V CIN 2.2μF 6.3V VIN1 VIN2 CHV 4.7n F 100V Ordering Information Device HV895BD This product is Ro HS pliant (‘Green’) VDD VIN2 SDA GND2 SCL HV Ball Configuration Die Option Lead-free solder-bumped die DUM1 DUM2 VIN1 GND1 .. OUT2 OUT1 Absolute Maximum Ratings Parameter VIN, VDD SDA,...