HV858 Ver la hoja de datos (PDF) - Supertex Inc
Número de pieza
componentes Descripción
Fabricante
HV858 Datasheet PDF : 7 Pages
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HV858
Pin Configuration
Pin Name Description
1
LX Inductor pin
2 GND Ground pin
3
VDD Input voltage supply pin. It is common practice to use a bypass
capacitor as close as possible to the device on this pin.
4
SDI Serial data input pin
5 SCK Serial clock input pin
6 EL1 EL lamp 1 pin
7 EL2 EL lamp 2 pin
8 EL3 EL lamp 3 pin
9 COM Common pin for one side of all 3 EL lamps
10
CS High Voltage capacitor pin
Logic Input Conditions
The serial data input consists of a 10-bit string, 3-bits of bright-
ness control and one bit(10th bit) to optionally control the power
converter. The power converter runs if any of the EL lamps has a
non-zero brightness value or if the PWR_ON bit is high while the
other 9 bits are low.
1. SDI may be H or L if SCK is H.
2. SCK may be H or L if SDI is H.
3. While inputting serial data to the shift register, SDI can
change value only when SCK is L.
4. The previous 10 bits of serial input will be latched when
SDI makes L to H transition while SCK is H.
EL Lamp Brightness Control
The EL Lamp brightness control is a 3-bit binary number stored
in a latch, which is provided by a serial to parallel conversion shift
register.
1. If all the 3 bits for a designated EL lamp are L, the differential
voltage across that lamp will be zero.
2. If any of the 3 bits for a designated EL lamp is H:
a. The 3-bit value sets the average number of cycles
for which the EL lamp voltage is non-zero.
b. The EL lamp brightness is linearly proportional
to the binary lamp control code.
Logic Input Diagram
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
SDI
MSB of
EL1
LSB of
EL1
EL 1 Control
MSB of
EL2
LSB of
EL2
EL 2 Control
MSB of
EL3
LSB of PWR_ON
EL3
EL 3 Control
SCK
Note:
1. Serial data is latched when SDI makes L to H transition and while SCK is H.
2. S1 is the first serial data input being fed.
Latches
in Data
A011706
3
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