EM65168 ELAN Microelectronics Corp, EM65168 Datasheet - Page 23

• Manufacturer Part Number: EM65168
• Description: 80 Com/seg Lcd Driver
• Manufacturer: ELAN Microelectronics Corp

Product Specification (V1.0) 04.26.2006
(This specification is subject to change without further notice)
(a) VOUT=2*VDD
VSS2+
VOUT
VREG
VSS2-
VSS4
VSS3
CA
CB
V1
V2
V3
V4
V5
C2
C1
Placing capacitor C2 in different configurations and across VOUT and VSS boosts the
voltage coming from VDD and VSS n-times and outputs the boosted voltage to VOUT
pin.
(a) Double step-up, (b) Triple step-up, (c) Quad step-up (d) five times step-up
C1=0.47 to 3.3µf, C2=0.1 to 2.2µf
a. Only the internal power supply is used, control register (PS1, PS0, IRS) = (1, 1, 0)
b. Only the V regulator circuit and the V/F circuit are used, the control register
c. Only the internal power supply is used, the control register (PS1, PS0, IRS) = (1, 1, 1).
d. Only the V regulator circuit and the V/F circuit are used, the control register
e. Only the V/F circuit is used, the control register (PS1, PS0) = (0, 1)
f.
Step-up Voltage Circuit
Reference circuit examples, as shown in Fig 7-11
C2
(PS1, PS0, IRS) = (1,0,0)
When internal regulator resistor is not used (external resistor is used),
V1=VREG*(1+Rb’/Ra’)
(PS1, PS0, IRS) = (1, 0, 1). When the internal regulator resistor is not used
(external resistor is used), V1=VREG*(1+Rb’/Ra’)
Only the external power supply is used, the control register (PS1, PS0) = (0, 0)
(b) VOUT=3*VDD
VSS2+
VOUT
VSS2-
VREG
VSS4
VSS3
CA
CB
V1
V2
V3
V4
V5
Fig 7-10 Step-up Voltage Circuit
C1
C2
C2
C2
(c) VOUT=4*VDD
VSS2+
VOUT
VSS2-
VREG
VSS4
VSS3
CA
CB
V1
V2
V3
V4
V5
C2
C1
C2
C2
C2
80 COM/SEG LCD Driver
(d) VOUT=5*VDD
VOUT
VSS2+
VSS2-
VREG
VSS4
VSS3
CB
CA
V1
V2
V3
V4
V5
EM65168
C2
C2
C2
C2
C2
C1
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