HV892 SIRECTIFIER | Alldatasheet
Document overview
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- PDF pages: 6
Technical content
Features
Drives capacitive loads up to 200pF Programmable drive amplitude (compatible with 40VRMS to 60VRMS lenses) On-chip boost converter No external inductor I2C interface Low operating current (≤20mA) Low standby current (≤1.0µA) Controlled drive edge reduces EMI 10-Lead 4x4mm DFN Package
Applications
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 I2C interface, is capable of driving capacitive loads of up to 200pF, and is compatible with 40V RMS to 60VRMS 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 1.0µA. 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. VDD SDA SCL GND1 VIN HV OUT1 OUT2 I2C bus HV892 GND2 CHV 4.7nF 100V VDD 1.7 - 2.95V VIN 2.65 - 5.5V CIN 2.2μF 6.3V Liquid Lens 100 - 200pF
Ordering Information
4x4mm body, 0.80mm height (max.), 0.65mm pitch HV892 HV892K7-G This product is RoHS compliant (‘Green’) Absolute Maximum Ratings Parameter Value VIN, VDD -0.5V to +6.5V SDA, SCL -0.5V to +6.5V Operating temperature -40°C to +85°C Storage temperature -65°C to +150°C Electrical Specifications (Over recommended operating conditions @ TA = 25OC unless otherwise specified) Pin Configuration 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 VIN Supply voltage 2.65 - 5.50 V --- VDD I2C logic level reference 1.70 - 2.95 V --- tVIN Time for VIN to ramp to 90%1 - - 2.0 ms --- CIN Supply bypass capacitor - 2.2 - μF --- CHV High voltage storage capacitor 24 - - x CLOAD 100V rating CLOAD Load (lens) capacitance 100 150 200 pF --- fSCL I2C clock - - 400 kHz --- TA Ambient temperature -25 - +85 OC --- 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 IIN VIN supply current - - 500 nA AMP = 00h, SDA = VDD, SCL = VDD - 8.0 20 mA AMP = FFh, SDA = VDD, SCL = VDD IDD VDD supply current - - 500 nA AMP = 00h, SDA = VDD, SCL = VDD - 9.0 12 μA AMP = FFh, SDA = VDD, SCL = VDD HV Output voltage of internal boost converter 71 75 79 V CLOAD = 0pF 4 7 VIN SCL NC SDA VDD OUT1 OUT2 GND2 101GND1 HV H892 YWLL 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.
Sym Parameter Min Typ Max Units Conditions VOUT(AC) AC output voltage - 0 - VRMS AMP = 00h 9.0 10 11 AMP = 01h 58.5 62.0 65.5 AMP = FFh VOUT(DC) DC output offset voltage -2.0 0 +2.0 V --- DNL Differential non-linearity (guaranteed monotonic) -0.5 - +0.5 LSB --- fOUT Output frequency 1.0 1.5 2.0 kHz --- DX Transition time (fraction of period) - 4.7 - % --- dV/dt Output slope - 4.7 - V/μs CLOAD = 150pF, VIN = 3.8V tSU Startup time to 90% amplitude1 - - 20 ms AMP = 00h → FFh, CHV = 4.7nF tA Amplitude response time1 - - 5.0 ms Over any 1-step AMP increment or decrement (except 00h) VIL Logic low input voltage - - 0.30 x VDD --- VIH Logic high input voltage 0.7 - - x VDD --- VOL Logic low output voltage - - 0.2 x VDD ILOAD = 3.0mA IL Logic low input current - - 10 μA VDD = 1.70 - 2.95V IH Logic high input current - - 10 μA VDD = 1.70 - 2.95V CLI Logic input capacitance - - 10 pF VDD = 1.70 - 2.95V, grounded or open Notes: 1. Measured from the rising edge of the I2C acknowledge bit that terminates transmission of the AMP data byte. Electrical Specifications (cont.)(Over recommended operating conditions @ TA = 25OC unless otherwise specified) Block Diagram and Typical Application VIN DC/DC SDA SCL Osc H-bridge driver HV enable Host Controller VDIG 1.70 – 2.95V VANA 2.65 – 5.50V CHV 4.7nF 100V CLENS 100 –200pF OUT1 OUT2 I2C bus GND2 amp CIN 2.2µF 6.3V Control DACGND1 VDD HV892
The HV892 is a write-only fast mode I2C device. Logic voltages are referenced to VDD. Address The HV892 recognizes a 7-bit address. The device is pre-programmed with an I 2C 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 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 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 CHV at the expense of possible waveform distortion. 01h-FFh Controls output amplitude according to: VOUT(RMS) = 9.8VRMS + AMP • 205mVRMS Supplies VIN 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 DX 1 /fOUT dV/dt (all edges) VOUT AMP=FFh AMP<FFh DX
1 GND1 Ground for the DC–DC converter. Connect GND1 and GND2 together close to the IC. 2 VIN Input voltage. Bypass with a 2.2µF capacitor to GND1. 3 SCL Clock for the I2C interface. The HV892 is a Fast Mode device (fSCL ≤ 400kHz). 4 SDA Serial data for the I2C 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 I2C logic levels. Connect to the I2C 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.
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 θ Dimension (mm) MIN 0.70 0.00 0.20 REF 0.65 BSC 0.30 - 0O JEDEC Registration MO-229, Variation WGGC, Issue C, Aug. 2003. Drawings not to scale. Supertex Doc.#: DSPD-10DFNK74X4P065, Version NR060508. Seating Plane θ Top View Side View Bottom View A D E eb L View B View B Note 1 (Index Area D/2 x E/2) Note 3 Note 2 Note 1 (Index Area D/2 x E/2) Notes: Details of Pin 1 identifier are optional, but must be located within the indicated area. The Pin 1 identifier 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.