S-8330A24FS-T2 Seiko Instruments, S-8330A24FS-T2 Datasheet - Page 18

• Manufacturer Part Number: S-8330A24FS-T2
• Description: Switching Converters, Regulators & Controllers 12-24V 100uA 2.4%
• Manufacturer: Seiko Instruments

Specifications of S-8330A24FS-T2

• Output Voltage: 24 V
• Output Current: 5 mA
• Input Voltage: 2 V to 9 V
• Operating Temperature Range: - 20 C to + 70 C
• Mounting Style: SMD/SMT
• Package / Case: SSOP-8
• Duty Cycle (max): 84 %
• Number Of Outputs: 1
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

18
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL SWITCHING REGULATOR
S-8330/8331 Series
VDIN
VCLK
VSTRB
Output Voltage
±1/2LSB
3. Electric Volume
(V)
The S-8330/31 series incorporates an electric volume with an 8-bit shift register and an 8-bit latch.
The output voltage is variable in the width of 12 V. The output voltage can be held in the data
transmission mode because the data read in the shift register is fetched into the latch by
unshyncronized strobe input. Figure 9 shows a block diagram and timing charts .
VDIN: Inputs data to the electric volume.
VCLK: Inputs clock to the electric volume.
VSTRB: Inputs strobe signal.
0
1
RESET
”Data 1” is input at “H”level; ”Data 0” is input at ”Low” level.
Fetches data at VDIN pin into the shift register at the rising edge of clocks. When clocks of
over 8 bits are input, the read data is shifted in succession for each clock, and data
corresponding to 8 bits which was input lastly is valid.
The contents of the shift register are latched by turning the strobe signal to ”H”. When the
data fetched into the latch is directly transmitted to the electric volume, the output voltage
changes. Data in the latch is held by turning the strobe signal to ”L”.
Figure 10 Linearity Accuracy
Shift Register
Volume
Electric
Latch
8-bit
8-bit
127
128
Figure 9 Block Diagram and Timing
VOUT
VOUT
VCLK
VSTRB
VDIN
Seiko Instruments Inc.
254
255
Reset
±1/2LSB
(±23.5mV)
Min. value
Data (DEC)
Electric
Volume
Hold
(MSB)
D7
±2LSB
(±93.8mV)
D6
The electric volume has 8-bit resolution.
An error in linearity may exceed ±1/2LSB
(±23.5 mV) only before or after data
changeover of 127←→128
(01111111←→10000000) (see Figure 9).
The error in linearity corresponds to 6 bits
(±93.8 mV) when used in the 12 V variable
range.
In an application where the variable range
of output voltage is 6 V or less, it is
possible to use it with high linearity
accuracy with appropriate product
selection. For example, if you want to
change output voltage within the range
from 12 V to 18 V, select the S-8330A24FS
and use it within the range of 0
(00000000
linearity accuracy (within±1/2LSB) can be
obtained.
D5
D4
←→
D3
01111111). If so, high
D2
D1
(LSB)
D0
Rev.6.0
Read
←→
Setting
value
127
Hold
_00