hv892 features drives capacitive loads up to 200pf programmable drive amplitude (compatible with 40v rms to 60v rms lenses) on-chip boost converter no external inductor i 2 c interface low operating current (20ma) low standby current (1.0a) controlled drive edge reduces emi 10-lead 4x4mm dfn package applications cell phone cameras pda and ultracompact cameras bar code readers web and laptop cameras ? ? ? ? ? ? ? ? ? ? ? ? ? typical application circuit inductorless liquid lens driver general description the hv892 liquid lens driver is controlled via an i 2 c interface, is capable of driving capacitive loads of up to 200pf, and is compatible with 40v rms to 60v rms lenses. a single byte (amp) written to the hv892 controls the operation of the driver. setting amp = 01h to ffh controls output amplitude in 255 monotonic steps. setting amp = 00h causes the hv892 to go into low power standby mode, consuming less than 1.0a. when active, the hv892 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 chip capacitors are the only external components required for a complete lens driver circuit. 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 hv892 is offered in a 10-lead 4x4mm dfn package. vd d sd a sc l gnd1 vi n hv out1 out2 i 2 c bus hv89 2 gnd2 c hv 4.7nf 100 v v dd 1.7 - 2.95 v v in 2.65 - 5.5 v c in 2.2f 6.3 v liquid lens 100 - 200pf
2 hv892 ordering information device package option 10-lead dfn 4x4mm body, 0.80mm height (max.), 0.65mm pitch hv892 HV892K7-G this product is rohs compliant (green) absolute maximum ratings parameter value v in , v dd -0.5v to +6.5v sda, scl -0.5v to +6.5v operating temperature -40c to +85c storage temperature -65c to +150c electrical speci?cations (over recommended operating conditions @ t a = 25 o c unless otherwise speci?ed) pin con?guration product marking 10-lead dfn (top view) note: pads are at the bottom of the package. center heat slug is at ground potential recommended operating conditions sym parameter min typ max units conditions v in supply voltage 2.65 - 5.50 v --- v dd i 2 c logic level reference 1.70 - 2.95 v --- t vin time for v in to ramp to 90% 1 - - 2.0 ms --- c in supply bypass capacitor - 2.2 - f --- c hv high voltage storage capacitor 24 - - x c load 100v rating c load load (lens) capacitance 100 150 200 pf --- f scl i 2 c clock - - 400 khz --- t a ambient temperature -25 - +85 o c --- notes: 1. to assure the driver powers up in standby state. no damage will occur if ramped up slower. 10-lead dfn sym parameter min typ max units conditions i in v in supply current - - 500 na amp = 00h, sda = v dd , scl = v dd - 8.0 20 ma amp = ffh, sda = v dd , scl = v dd i dd v dd supply current - - 500 na amp = 00h, sda = v dd , scl = v dd - 9.0 12 a amp = ffh, sda = v dd , scl = v dd hv output voltage of internal boost converter 71 75 79 v c load = 0pf 8 2 3 4 7 6 5 vin scl nc sda vdd out1 out2 gnd2 10 1 gnd1 hv 9 h892 y w l l y = last digit of year sealed w = code for week sealed l = lot number = green packaging absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these conditions is not implied. continuous operation of the device at the absolute rating level may affect device reliability. all voltages are referenced to device ground.
3 hv892 sym parameter min typ max units conditions v out(ac) ac output voltage - 0 - v rms amp = 00h 9.0 10 11 amp = 01h 58.5 62.0 65.5 amp = ffh v out(dc) dc output offset voltage -2.0 0 +2.0 v --- dnl differential non-linearity (guaranteed monotonic) -0.5 - +0.5 lsb --- f out output frequency 1.0 1.5 2.0 khz --- d x transition time (fraction of period) - 4.7 - % --- dv/dt output slope - 4.7 - v/s c load = 150pf, v in = 3.8v t su startup time to 90% amplitude 1 - - 20 ms amp = 00h ffh, c hv = 4.7nf t a amplitude response time 1 - - 5.0 ms over any 1-step amp increment or decrement (except 00h) v il logic low input voltage - - 0.30 x v dd --- v ih logic high input voltage 0.7 - - x v dd --- v ol logic low output voltage - - 0.2 x v dd i load = 3.0ma i l logic low input current - - 10 a v dd = 1.70 - 2.95v i h logic high input current - - 10 a v dd = 1.70 - 2.95v c li logic input capacitance - - 10 pf v dd = 1.70 - 2.95v, grounded or open notes: 1. measured from the rising edge of the i 2 c acknowledge bit that terminates transmission of the amp data byte. electrical speci?cations (cont.)(over recommended operating conditions @ t a = 25 o c unless otherwise speci?ed) block diagram and typical application vin dc /d c sd a sc l os c h- brid ge dr iv er hv enab le 8 host cont ro ll er v di g 1.7 0 C 2 . 95v v an a 2.65 C 5 .5 0v c hv 4.7n f 10 0v c lens 10 0 C 20 0p f out1 out2 i 2 c bus gnd2 am p c in 2.2 f 6.3v cont ro l da c gn d1 vd d hv892
4 hv892 applications information i 2 c the hv892 is a write-only fast mode i 2 c device. logic voltages are referenced to v dd . address the hv892 recognizes a 7-bit address. the device is pre-programmed with an i 2 c address of 0100011b. for other ad - dresses, please contact the factory. data a single byte written to the hv892 controls the operation of the lens driver. see the command table below. the msb is clocked-in ?rst. 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 hv892 out of standby mode. the time it takes the hv892 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: v out(rms) = 9.8v rms + amp ? 205mv rms supplies v in should 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 d x 1 / f ou t dv/d t (a ll ed ge s) v o u t am p= ffh am p< ff h d x
5 hv892 pin functions pin name description 1 gnd1 ground for the dcCdc converter. connect gnd1 and gnd2 together close to the ic. 2 vin input voltage. bypass with a 2.2f capacitor to gnd1. 3 scl clock for the i 2 c interface. the hv892 is a fast mode device (f scl 400khz). 4 sda serial data for the i 2 c interface. the hv892 is a write-only device, with a single 8-bit command byte (amp, see page 4). 5 vdd externally supplied reference voltage for the i 2 c logic levels. connect to the i 2 c bus supply. 6 gnd2 ground for the ic except the dc-dc converter. connect gnd1 and gnd2 together close to the ic. 7 out2 outputs of the h-bridge driver. the liquid lens connects between these two pins. when disabled (amp = 00h), both of these outputs are held at ground. 8 out1 9 nc not connected. 10 hv high voltage dc output of the internal boost converter. connect a 4.7nf, 100v ceramic capacitor to ground close to the ic. exposed backside pad is at ground potential and should be connected to circuit ground.
6 hv892 doc.# dsfp-hv892 nr061908 10-lead dfn package outline (k7) 4x4mm body, 0.80mm height (max), 0.65mm pitch symbol a a1 a3 b d d2 e e2 e l l1 dimension (mm) min 0.70 0.00 0.20 ref 0.25 3.85 2.80 3.85 2.30 0.65 bsc 0.30 - 0 o nom 0.75 0.02 0.30 4.00 - 4.00 - 0.40 - - max 0.80 0.05 0.35 4.15 3.50 4.15 2.80 0.50 0.15 14 o jedec registration mo-229, variation wggc, issue c, aug. 2003. drawings not to scale. supertex doc.#: dspd-10dfnk74x4p065, version nr060508. seating plane to p v iew side v iew bottom v iew a a1 d e d2 e b e2 a3 l l1 vi ew b vi ew b note 1 (index area d/2 x e/2) note 3 note 2 note 1 (index area d/2 x e/2) 10 1 10 1 notes: details of pin 1 identi?er are optional, but must be located within the indicated area. the pin 1 identi?er may be either a mold, or an embedded metal or marked feature. depending on the method of manufacturing, a maximum of 0.15mm pullback (l1) may be present. the inner tip of the lead may be either rounded or square. 1. 2. 3.
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