The HV895 is designed to drive liquid lenses of up to 200pF with a
1.5kHz waveform at amplitudes up to
55V
RMS(min)
, controlled via an
I
2
C 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 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 0402 size capacitors are the only
external components required for a complete lens driver circuit.
The narrow die size and only 2 small external components 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 solder-bumped
flip-chip.
General Description
Applications
►
►
►
►
►
Cell phone and PDA
cameras
Bar code readers
Web and laptop cameras
Biometric scanners
Ultracompact cameras
Typical Application Circuit
I
2
C bus
V
DD
1.7 -2.95V
VDD
SDA
SCL
VIN1
VIN2
C
HV
4.7nF
100V
V
IN
2.65 - 5.5V
C
IN
2.2 F
6.3V
HV895
HV
GND1
OUT1
OUT2
GND2
Liquid Lens
100 -200pF
Supertex inc.
1235 Bordeaux Drive, Sunnyvale, CA 94089
Tel: 408-222-8888
www.supertex.com
HV895
Ordering Information
Device
HV895BD
Die Option
1.0mm x 6.0mm
Lead-free solder-bumped die
Ball Configuration
DUM1
DUM2
VIN1
GND1
This product is RoHS compliant (‘Green’)
VDD
SDA
GND2
SCL
HV
VIN2
Absolute Maximum Ratings
Parameter
V
IN
, V
DD
SDA, SCL
Operating temperature
Storage temperature
OUT2
OUT1
Value
-0.5V to 6.5V
-0.5V to 6.5V
-40°C to +85°C
-65°C to +150°C
Solder-bumped Die
(bottom view)
Product Marking
View
Top
H
L
Orientation
mark
V
L
8
L
9
L
5
L
B
L
D
L
L
Y
L
W
L
Device may not meet specifications, but will incur no damage.
Stresses beyond those listed under “Absolute Maximum Ratings” may
cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond
those indicated in the operational sections of the specifications is not implied.
Exposure to absolute maximum rating conditions for extended periods may
Y = Year
W = Week
L = Lot Number
Solder-bumped Die
(top view)
Recommended Operating Conditions
Sym
V
IN
V
DD
t
VIN
C
IN
C
DD
C
HV
C
LOAD
f
SCL
T
A
Parameter
Supply voltage
I
2
C logic level reference
Time for V
IN
to ramp to 90%
(1)
Supply bypass capacitor
V
DD
bypass capacitor
High voltage storage capacitor
Load (lens) capacitance
I
2
C clock
Ambient temperature
Min
2.65
1.70
-
-
100
24
100
-
-25
Typ
-
-
-
2.2
-
-
150
-
-
Max
5.5
2.95
2.0
-
-
-
200
400
+85
Units
V
V
ms
μF
nF
x C
LOAD
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 Characteristics
(Over recommended operating conditions @ 25 C unless otherwise specified)
O
Sym
I
IN
I
DD
V
HV
Parameter
V
IN
supply current
V
DD
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
μA
V
Conditions
AMP = 00h, SDA = V
DD
, SCL = V
DD
AMP = FFh, SDA = V
DD
, SCL = V
DD
AMP = 00h, SDA = V
DD
, SCL = V
DD
AMP = FFh, SDA = V
DD
, SCL = V
DD
C
LOAD
= 0pF
www.supertex.com
Supertex inc.
1235 Bordeaux Drive, Sunnyvale, CA 94089
2
Tel: 408-222-8888
HV895
Electrical Characteristics
(cont.)(Over recommended operating conditions @ 25 C unless otherwise specified)
O
Sym
V
OUT(AC)
V
OUT(DC)
DNL
f
OUT
D
X
dV/dt
t
SU
t
A
V
IL
V
IH
V
OL
I
IL
I
IH
C
LI
Parameter
AC output voltage
DC output offset voltage
Differential non-linearity (guaran-
teed monotonic)
Output frequency
Transition time (fraction of period)
Output slope
Startup time to 90% amplitude
1
Amplitude response time
1
Logic low input voltage
Logic high input voltage
Logic low output voltage
Logic low input current
Logic high input current
Logic input capacitance
Min
-
9.0
55.0
-2.0
-0.5
1.0
-
-
-
-
-
0.7
-
-
-
-
Typ
0
10.0
59.7
0
-
1.5
4.7
4.7
-
-
-
-
-
-
-
-
Max
-
11.0
62.7
+2.0
+0.5
2.0
-
-
20
5.0
0.3
-
0.2
10
10
10
Units
V
RMS
V
LSB
kHz
%
V/μs
ms
ms
x V
DD
x V
DD
x V
DD
μA
μA
pF
Conditions
AMP = 00h
AMP = 01h
AMP = FFh
---
---
---
---
C
LOAD
= 150pF, V
IN
= 3.8V
AMP = 00h → FFh, C
HV
= 4.7nF
Over any 1-step AMP increment or
decrement (except 00h)
---
---
I
SINK
= 3.0mA
V
DD
= 1.70 - 2.95V
V
DD
= 1.70 - 2.95V
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.
2. Guaranteed by design.
Block Diagram and Typical Application
C
HV
4.7nF
100V
VIN2
V
ANA
2.65 - 5.50V
VIN1
C
IN
2.2µF
6.3V
GND1
DC/DC
DAC
OUT1
VDD
SDA
I
2
C Bus
SCL
Control
amp
enable
Osc
GND2
8
H-bridge
Driver
OUT2
C
LENS
100 - 200pF
HV
HV895
V
DIG
1.70 - 2.95V
Host
Controller
Supertex inc.
1235 Bordeaux Drive, Sunnyvale, CA 94089
3
Tel: 408-222-8888
www.supertex.com
HV895
Output Waveform
AMP=FFh
D
X
dV/dt
(all edges)
AMP<FFh
V
OUT
1/f
OUT
D
X
Application Information
I
2
C
The HV895 is a write-only fast mode I
2
C device. Logic voltages are referenced to V
DD
.
Address
The HV895 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 HV895 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 OUT1 and OUT2 pins are held at ground.
00h
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. A
faster startup time may be achieved by lowering C
HV
, at the expense of possible waveform distortion.
Controls output amplitude according to:
01h-FFh
V
OUT(RMS)
= 9.4V
RMS
+ (AMP • 197mV
RMS
)
where AMP is an integer from 1 to 255
V
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 ampli-
Supplies
tude 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.
Supertex inc.
1235 Bordeaux Drive, Sunnyvale, CA 94089
4
Tel: 408-222-8888
www.supertex.com
HV895
Die Dimensions
DUM1
+0
1000 -75
DUM2
500±25
VIN1
GND1
VDD
+0
6000 -196
SDA
GND2
SCL
VIN2
HV
124 - 137
OUT2
0
442.8
143.3
Orientation mark
this end, top side
100±25
OUT1
Y
X
Note:
All dimensions in µm
Bottom View
0
Side View
Bump Coordinates and Descriptions
(XY coordinates reference center of bump and are in µm. Tolerance is ±15µm.)
Bump
VIN1
VIN2
VDD
GND1
GND2
SCL
SDA
HV
OUT1
OUT2
DUM1
DUM2
X
353.4
675.4
12.7
353.4
-14.8
12.7
12.7
722.4
666.3
0
3.9
702.9
Y
5201.7
2424.6
2891.0
4397.6
1844.0
1594.0
2171.2
1006.6
0
0
5334.2
5334.2
Description
VIN1 supplies the DC-DC converter. VIN2 supplies the rest of the IC. They must be tied together. To
minimize conducted EMI, bypass with a 2.2µF ceramic capacitor to ground close to the IC.
Externally supplied reference voltage for the I
2
C logic levels. Connect to the I
2
C bus supply.
GND1 is the ground for the DC-DC converter, while GND2 is the ground for the rest of the IC. Connect
both pins to system ground.
Serial clock for the I
2
C interface. The HV895 is a Fast Mode device (f
SCL
≤ 400kHz).
Serial data for the I
2
C interface. The HV895 is a write-only device, with a single 8-bit command byte
(AMP, see page 4).
High voltage DC output of the internal boost converter. Connect a 4.7nF, 100V ceramic capacitor to
ground close to the IC.
Outputs of the H-bridge driver. The liquid lens connects between these two bumps. When disabled
(AMP = 00h), both of these outputs are held at ground.
These bumps are for mechanical support only. Provide pads on the PCB for these solder bumps. No
electrical connections should be made to these bumps.
Supertex inc.
does not recommend the use of its products in life support applications, and will not knowingly sell them for use in such applications unless it receives
an adequate “product liability indemnification insurance agreement.”
Supertex inc.
does not assume responsibility for use of devices described, and limits its liability
to the replacement of the devices determined defective due to workmanship. No responsibility is assumed for possible omissions and inaccuracies. Circuitry and
specifications are subject to change without notice. For the latest product specifications refer to the
ABI Research最近评选并公布了全球超高频无源和高频无源 RFID芯片的前十大制造商。 前十大超高频无源芯片制造商是： 前十大高频无源芯片制造商是： 超高频的得奖名单并不出人意外，因为实际上似乎总是前三家公司获得大订单。ABI分析家 Mike Liard称，ABI很容易就评选出 Alien、Avery,和 Raflatac为全球...[详细]
在全球半导体产业因景气不佳而纷传并购、整合之际，两大IT巨头三星、IBM日前却双双宣布，将强化半导体产业投资。 三星电子本周一宣布，已向韩国证券交易所提交一份申请文件，打算2008年投下10.5亿美元，用于升级内存芯片生产线、改进技术工艺，从而提高产能并降低成本。无独有偶。本周二IBM公司宣布，未来3年将投资10亿美元，用于扩充位于纽约州 East Fishkill 的半导体工厂，以消...[详细]
模拟电子
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
