HV856K7-G 데이터 시트보기 (PDF) - Supertex Inc
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HV856K7-G Datasheet PDF : 7 Pages
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HV856
Specifications (cont.)
Symbol Parameter
Min Typ
Max
DMAX
Maximum PWM switch duty
cycle
80
88
94
fCLK SCK speed
-
-
1
T
SU
SDI setup time before SCK
rises
30
-
-
TH
SDI hold time before SCK
rises
30
-
-
* Code refers to the 3-bit Brightness Control Code for the respective EL Lamp
Units Conditions
% VCS = 20V, RLOAD = 20Ω
MHz ---
ns ---
ns ---
Logic Input Conditions
The serial data input consists of a 10-bit string, three bits of
brightness 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 nine 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 ten 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 three bits for a designated EL lamp are L, the
differential voltage across that lamp will be zero.
2. If any of the three 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
SDI
S1
S2
S3
MSB of
EL1
LSB of
EL1
EL1 Control
S4
S5
S6
MSB of
EL2
LSB of
EL2
EL2 Control
S7
S8
S9
S10
MSB of
EL3
LSB of
EL3
EL3 Control
PWR_ON
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
3
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