SSD1815B 查看數據表（PDF） - Unspecified
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SSD1815B Datasheet PDF : 36 Pages
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Oscillator Circuit
This module is an On-Chip low power RC oscillator circuitry (Figure 4). The oscillator generates the clock for the DC-DC
voltage converter. This clock is also used in the Display Timing Generator.
enable
Oscillation Circuit
Oscillator enable
(CLS)
enable
Buffer
(CL)
OSC1
Internal resistor
OSC2
Figure 4 Oscillator Circuitry
LCD Driving Voltage Generator and Regulator
This module generates the LCD voltage required for
display driving output. With reference to VDD, it takes a sin-
gle supply input, VSS, and generate necessary voltage lev-
els. This block consists of:
1. 2X, 3X and 4X DC-DC voltage converter
The built-in DC-DC voltage converter is used to gener-
ate the large negative voltage supply with reference to VDD
from the voltage input (VSS1). SSD1815B is possible to
produce 2X, 3X or 4X boosting from the potential different
between VSS1 - VDD.
Detail configurations of the DC-DC converter for differ-
ent boosting multiples are given in Figure 5.
2. Voltage Regulator (Voltages referenced to VDD)
The feedback gain control for LCD driving contrast
curves can be selected by IRS pin to either internal (IRS pin
= H) or external (IRS pin = L).
If internal resistor network is enabled, eight settings
can be selected through software command.
If external control is selected, external resistors are re-
quired to be connected between VDD and VF (R1), and be-
tween VF and VL6 (R2). See application circuit diagrams for
detail connections.
SSD1815B
12
Rev 1.6
07/2002
VSS1 VEE
SSD1815B
C3N C1P C1N C2P C2N
+
+
C1
C1
2X Boosting Configuration
VSS1 VEE
SSD1815B
C3N C1P C1N C2P C2N
+
+
+
C1
C1
C1
3X Boosting Configuration
VSS1 VEE
SSD1815B
C3N C1P C1N C2P C2N
+
++
+
C1
C1 C1
C1
4X Boosting Configuration
Remarks:
1. C1 = 0.47 - 1.0uF
2. Boosting input from V SS1.
3. VSS1 should be lower potential than or equal to VSS
4. All voltages are referenced to V DD
Figure 5 DC-DC Converter Configurations
SOLOMON
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