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HV892 Inductorless Liquid Lens Driver
Features
Drives capacitive loads up to 200pF Programmable drive amplitude (compatible with 40VRMS to 60VRMS lenses) www..com boost converter On-chip No external inductor I2C interface Low operating current (20mA) Low standby current (1.0A) Controlled drive edge reduces EMI 10-Lead 4x4mm DFN Package
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 40VRMS 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 1.0A. 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.
Applications
Cell phone cameras PDA and ultracompact cameras Bar code readers Web and laptop cameras
Typical Application Circuit
I2C bus VIN 2.65 - 5.5V CIN 2.2F 6.3V SDA SCL VDD 1.7 - 2.95V VDD VIN HV CHV 4.7nF 100V
HV892
GND1 GND2
OUT1 OUT2
Liquid Lens 100 - 200pF
HV892
Ordering Information
Package Option Device
4x4mm body, 0.80mm height (max.), 0.65mm pitch
Pin Configuration
10-Lead DFN
GND1 VIN SCL SDA VDD
1 2 3 4 5 10 9 8 7 6
HV NC OUT1 OUT2 GND2
HV892
This product is RoHS compliant (`Green')
HV892K7-G
10-Lead DFN
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Absolute Maximum Ratings
Parameter VIN, VDD SDA, SCL Operating temperature Storage temperature Value -0.5V to +6.5V -0.5V to +6.5V -40C to +85C -65C to +150C
Note: Pads are at the bottom of the package. Center heat slug is at ground potential
Product Marking H892 YWLL
Y = Last Digit of Year Sealed W = Code for Week Sealed L = Lot Number = "Green" Packaging 10-Lead DFN
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.
Recommended Operating Conditions
Sym VIN VDD tVIN CIN CHV CLOAD fSCL TA Parameter Supply voltage I2C logic level reference Time for VIN to ramp to 90%1 Supply bypass capacitor High voltage storage capacitor Load (lens) capacitance I2C clock Ambient temperature Min 2.65 1.70 24 100 -25 Typ 2.2 150 Max 5.50 2.95 2.0 200 400 +85 Units V V ms F x CLOAD pF kHz
O
Conditions --------100V rating -------
C
Notes: 1. To assure the driver powers up in standby state. No damage will occur if ramped up slower.
Electrical Specifications (Over recommended operating conditions @ T = 25 C unless otherwise specified)
A O
Sym IIN IDD HV
Parameter VIN supply current VDD supply current Output voltage of internal boost converter
Min 71
Typ 8.0 9.0 75
Max 500 20 500 12 79
Units nA mA nA A V
Conditions AMP = 00h, SDA = VDD, SCL = VDD AMP = FFh, SDA = VDD, SCL = VDD AMP = 00h, SDA = VDD, SCL = VDD AMP = FFh, SDA = VDD, SCL = VDD CLOAD = 0pF
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HV892
Electrical Specifications (cont.)(Over recommended operating conditions @ T = 25 C unless otherwise specified)
A O
Sym VOUT(AC) VOUT(DC) DNL fOUT
X
Parameter AC output voltage DC output offset voltage Differential non-linearity (guaranteed monotonic) Output frequency time (fraction of period)
1
Min 9.0 58.5 -2.0 -0.5 1.0 0.7 -
Typ 0 10 62.0 0 1.5 4.7 4.7 -
Max 11 65.5 +2.0 +0.5 2.0 20 5.0 0.30 0.2 10 10 10
Units VRMS V LSB kHz % V/s ms ms x VDD x VDD x VDD A A pF
Conditions AMP = 00h AMP = 01h AMP = FFh --------CLOAD = 150pF, VIN = 3.8V AMP = 00h FFh, CHV = 4.7nF Over any 1-step AMP increment or decrement (except 00h) ----ILOAD = 3.0mA VDD = 1.70 - 2.95V VDD = 1.70 - 2.95V VDD = 1.70 - 2.95V, grounded or open
www..comTransition D
dV/dt tSU tA VIL VIH VOL IL IH CLI
Output slope Startup time to 90% amplitude Amplitude response time1 Logic low input voltage Logic high input voltage Logic low output voltage Logic low input current Logic high input current Logic input capacitance
Notes: 1. Measured from the rising edge of the I2C acknowledge bit that terminates transmission of the AMP data byte.
Block Diagram and Typical Application
CHV 4.7nF 100V HV VANA 2.65 - 5.50V VIN CIN 2.2F 6.3V GND1
HV892
DC/DC DAC
OUT1
VDIG 1.70 - 2.95V
VDD SDA SCL
8
Host Controller
I2C bus
Control
amp enable
H-bridge driver
OUT2
CLENS 100 - 200pF
Osc
GND2
3
HV892
Output Waveform
AMP=FFh
DX
(all edges)
dV/dt
VOUT
AMP1 / fOUT
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DX
Applications Information
I2C
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 I2C address of 0100011b. For other addresses, 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 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. 00h 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. Controls output amplitude according to: 01h-FFh 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.
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HV892
Pin Functions
Pin 1 2 3 4 5
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Name GND1 VIN SCL SDA VDD GND2 OUT2 OUT1 NC HV
Description Ground for the DC-DC converter. Connect GND1 and GND2 together close to the IC. Input voltage. Bypass with a 2.2F capacitor to GND1. Clock for the I2C interface. The HV892 is a Fast Mode device (fSCL 400kHz). Serial data for the I2C interface. The HV892 is a write-only device, with a single 8-bit command byte (AMP, see page 4). Externally supplied reference voltage for the I2C logic levels. Connect to the I2C bus supply. Ground for the IC except the DC-DC converter. Connect GND1 and GND2 together close to the IC. 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. Not connected. High voltage DC output of the internal boost converter. Connect a 4.7nF, 100V ceramic capacitor to ground close to the IC.
6 7 8 9
10
Exposed backside pad is at ground potential and should be connected to circuit ground.
5
HV892
10-Lead DFN Package Outline (K7)
10 D
4x4mm body, 0.80mm height (max), 0.65mm pitch
D2 10
www..com Note 1 (Index Area D/2 x E/2)
E
E2
1
b
e
1 View B
Note 1 (Index Area D/2 x E/2)
Top View
Bottom View
Note 3
A A3 A1
Seating Plane Note 2
L L1
Side View
View B
Notes: 1. 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. 2. Depending on the method of manufacturing, a maximum of 0.15mm pullback (L1) may be present. 3. The inner tip of the lead may be either rounded or square.
Symbol Dimension (mm) MIN NOM MAX
A 0.70 0.75 0.80
A1 0.00 0.02 0.05
A3 0.20 REF
b 0.25 0.30 0.35
D 3.85 4.00 4.15
D2 2.80 3.50
E 3.85 4.00 4.15
E2 2.30 2.80
e 0.65 BSC
L 0.30 0.40 0.50
L1 0.15
0O 14O
JEDEC Registration MO-229, Variation WGGC, Issue C, Aug. 2003. Drawings not to scale. Supertex Doc.#: DSPD-10DFNK74X4P065, Version NR060508.
Doc.# DSFP-HV892 NR061908
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