HV892DB1 Supertex, HV892DB1 Datasheet - Page 2

• Manufacturer Part Number: HV892DB1
• Description: Display Modules & Development Tools INDUCTORLESS LIQUID LENS DRVR DEMOBOARD
• Manufacturer: Supertex

HV892DB1 Circuit Schematic
Bill of Materials
Operation
A single byte (AMP) written to the HV892 controls the opera-
tion of the driver. Setting AMP = 00h causes the HV892 to
go into low power standby mode. Setting AMP = 01h to FFh
controls output amplitude in 255 monotonic steps.
The HV892 is write-only. No readback of the AMP byte is
possible.
The HV892’s 7-bit address is 0100011b. For large quantity
orders, other 7-bit addresses may be obtained.
The resistors shown on the above schematic are the I
normal pull-ups. No additional pull-ups are required. Exter-
nally supplied V
061108
Part
C
IC
C
HV
IN
1
I 2 C bus
V
OUT(RMS)
Ceramic capacitor
Ceramic capacitor
1.70 – 2.95V
Description
DD
Lens driver
is the I
= 9.6V
V
DD
2.65 – 5.5V
2
C bus’ reference voltage.
RMS
+ AMP • 208mV
V
IN
Value
2.2μF
4.7nF
-
HV892DB1
VDD
SDA
SCL
VIN
GND
2.2µF
C
RMS
Tolerance
IN
20%
10%
-
2
C bus’
IC
VDD
SDA
SCL
4.7nF
VIN
C
1
HV
2
Rating
100V
6.3V
Externally supplied V
2.0ms to ensure 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 V
2.0ms.
Light capacitive loads may result in waveform distortion.
This is due to the output pins being held at a high-Z state for
a portion of the waveform. Without adequate capacitance
to hold up the voltage, some droop may be observed when
DC-loaded by oscilloscope probes.
To avoid loading down the outputs, use instruments hav-
ing at least 10MΩ input impedance when taking measure-
ments. While many voltmeters may have a very high input
resistance on the DC scale, they frequently have only 1.0MΩ
input impedance on the AC scale. Also, be sure to use a
voltmeter with true RMS capability.
HV
-
HV892
GND1
Package
4x4 DFN
GND2
0603
0603
OUT1
OUT2
IN
OUT2
OUT1
Manufacturer
should be ramped up in less than
Supertex
Any
Any
IN
is brought up slower than
Liquid Lens
100 – 200pF
Part Number
HV892K7-G
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