HV895 datasheet(4/5 Pages) SUTEX

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HV895

Applications Information

I2C

The HV895 is a write-only fast mode I2C device. Logic voltages are referenced to V

DD.

Address

The HV895 recognizes a 7-bit address. The device is pre-programmed with an I2C address of 0100011b. For other ad-

dresses, please contact the factory.

Data

A single byte written to the HV895 controls the operation of the lens driver. See the Command Table below. The MSB is

clocked-in ﬁrst.

Command Table

AMP

Description

00h

Low power standby mode. When in standby mode, the internal boost converter and H-bridge oscillator are

shut down, and the OUT pins are held at ground.

Any AMP value other than 00h brings the HV895 out of standby mode. The time it takes the HV895 to exit

standby mode and achieve full output amplitude is less than 20ms with a 4.7nF capacitor on the HV pin.

Faster startup times may be achieved by lowering C

HV at the expense of possible waveform distortion.

01h-FFh

Controls output amplitude according to:

OUT(RMS) = 9.4VRMS + (AMP • 197mVRMS)

where AMP is an integer from 1 to 255

Supplies

IN must be ramped up in less than 2.0ms to assure the driver starts-up in standby mode. If brought up slower, the driver

may not start-up in standby mode, with output amplitude at an indeterminate level. In this case, writing AMP = 00h brings

the driver to standby mode. No damage will occur if ramped slower than 2.0ms.

Output Waveform

1/ fOUT

dV/dt

(all edges)

AMP=FFh

AMP<FFh

HV895 Datasheet(PDF) 4 Page - Supertex, Inc