upd161608 Renesas Electronics Corporation., upd161608 Datasheet - Page 16

• Manufacturer Part Number: upd161608
• Description: 176-rgb X 220-dot 1-chip Driver Ic For 262,144-color Tft-lcd Display
• Manufacturer: Renesas Electronics Corporation.

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5. POWER SUPPLY CIRCUIT
consist of DC/DC converter circuits 1, 2 and 3. DC/DC converter circuit 1 doubles the voltage supplied to VCI, and that
voltage is doubled or tripled in DC/DC converter circuit 2. And DC/DC converter circuit 3 flips the VCI level and generates
the VCI2 level. These DC/DC converter circuits generate power supplies VCIX2, VGH, VGL.
16
Figure 5−1 shows a configuration of the voltage generation circuit for the
0.1 μF
6.3 V
0.1 μF
6.3 V
0.1 μF
6.3 V
0.1 μF
16 V
0.1 μF
16 V
VCI
CXN
CXP
CYP
CYN
C1P
C1N
C3N
C2P
C2N
C3P
Figure 5−1. Configuration of the Internal Power Supply Circuit
1st Booster
2nd and
3rd Booster
VDV [4:0]
VCM [5:0]
BT [2:0]
VRH [3:0]
Data Sheet S17594EJ2V0DS
Band gap
reference
2.0 V
adjustment
VCOM
VLCD63
regulator
to gate driver
(Bottom)
Low
active
regulator
regulator
V
COMH
COML
DDIO
VCI
V
V
VCI2
DD
DD
regulator
EEPROM
regulator
voltage
Power
shift
read
Gray-scale
amplifier
μ
T/C
PD161608. The DC/DC converter circuits
to gate driver
(Top)
L/S
Shottky diode
to source
driver
internal
Shottky diode
logic
to
REGVDD
TESTA
VCI2
RVDD
VGL
TESTB
VLCD63
VCOMR
VCOMH
VCOMH
VCOM
VCOML
VCOML
VGH
VCIX2
Shottky diode
μ
PD161608
1 μF
6.3 V
1 μF
6.3 V
1 μF
16 V
1 μF
16 V
1 μF
6.3 V
1 μF
16 V
1 μF
6.3 V
1 μF
6.3 V
1 μF
6.3 V
1 μF
6.3 V
1 μF
16 V
1 μF
6.3 V