em65567 ELAN Microelectronics Corp, em65567 Datasheet - Page 35

• Manufacturer Part Number: em65567
• Description: Com/ Color Driver
• Manufacturer: ELAN Microelectronics Corp

pixels. Otherwise, display quality will degrade considerably. Instead, use an external power supply. When using the external
power supply, turn off the internal power supply (AMPON, DCON=”00”), disconnect pins CAP1+, CAP2+, CAP2-, CAP3+,
CAP3-, VOUT, VEE, VREF and VREG. Then, feed external LCD drive voltages to pins V0, V1, V2, V3 and V4. The power
circuit can be control by power circuit related register. So partial function of built-in power circuit can use with external
power supply.
※ 1 Because the booster and voltage converter not operating, disconnect pins
※ 2 Because the booster is not operating, disconnect pins
7.22 Booster Circuit
Placing capacitor C1 across CAP1+ and CAP1-, across CAP2+ and CAP2-, across CAP3+ and CAP3- and across VOUT and
VSS boosts the voltage coming from VEE and VSS n-times and outputs the boosted voltage to VOUT pin. The twice, third,
or fourth boosted voltage output to the VOUT pin by the boost step register set. The boost step registers set by the command.
(1) In case of using only twice boosted voltage, placing C1 only across CAP1+ and CAP1- and opening CAP2+, CAP2-,
(2) In case of using only third boosted voltage, placing C1 only across CAP1+ and CAP1-, across CAP2+ and CAP2- and
(3) In case of using only fourth boosted voltage, placing C1 only across CAP1+ and CAP1-, across CAP2+ and CAP2-,
When use built-in booster circuit, output voltage (VOUT) must less than recommended operating voltage (15.0 Volt). If
output voltage (VOUT) over recommended operating voltage, correct work of chip can not guarantee.
* This specification is subject to be changed without notice.
DCON AMPON Booster circuit Voltage conversion circuit
0
0
1
CAP3+, CAP3
opening CAP3+, CAP3-
across CAP3+ and CAP3-
CAP1+, CAP1-, CAP2+, CAP2-, CAP3+, CAP3-, VOUT, VEE, VREG and VREF.
Apply external LCD drive voltages to corresponding pin.
CAP1+, CAP1-, CAP2+, CPA2-, CAP3+, CAP3-
Derive the voltage source to be supplied to the voltage converter from VOUT pin and then
Input the reference voltage at VREF pin.
0
1
1
DISABLE
DISABLE
ENABLE
VEE=3V
VSS=0V
VOUT=9 V
3 times boostng
DISABLE
ENABLE
ENABLE
V0,V1,V2,V3 and V4 are supplied
35
66 COM/ 96 SEG 256 Color STN LCD Driver
Extemal voltage input
VEE=3V
VSS=0V
VOUT is supplied
-
4 times boostng
Note
※1
※2
-
2003/1/9 (V0.1)
EM65567