ST7565S
Ver 0.3c
19/72
2002/07/22
P
PIIN
N D
DE
ES
SC
CR
RIIP
PT
TIIO
ON
NS
S
Power Supply Pins
Pin Name
I/O
Function
No. of Pins
VDD
Power
Supply
Shared with the MPU power supply terminal Vcc.
13
VSS
Power
Supply
This is a 0V terminal connected to the system GND.
10
VSS2
Power
Supply
This is the reference power supply for the step-up voltage circuit for the
liquid crystal drive.
2
VRS
Power
Supply
This is the internal-output VREG power supply for the LCD power supply
voltage regulator.
2
V1, V2,
V3, V4,
V5
Power
Supply
This is a multi-level power supply for the liquid crystal drive. The voltage Supply
applied is determined by the liquid crystal cell, and is changed through the use of
a resistive voltage divided or through changing the impedance using an op. amp.
Voltage levels are determined based on VDD, and must maintain the relative
magnitudes shown below.
VDD (= V0) ≧V1 ≧V2 ≧V3 ≧V4 ≧V5
When the power supply turns ON, the internal power supply circuits produce the
V1 to V4 voltages shown below. The voltage settings are selected using the LCD
bias set command.
1/65 DUTY
1/49 DUTY
1/33 DUTY
1/55 DUTY
1/53 DUTY
V1
V2
V3
V4
1/9*V5,1/7*V5
2/9*V5,2/7*V5
7/9*V5,5/7*V5
8/9*V5,6/7*V5
1/8*V5,1/6*V5
2/8*V5,2/6*V5
6/8*V5,4/6*V5
7/8*V5,5/6*V5
1/6*V5,1/5*V5
2/6*V5,2/5*V5
4/6*V5,3/5*V5
5/6*V5,4/5*V5
1/8*V5,1/6*V5
2/8*V5,2/6*V5
6/8*V5,4/6*V5
7/8*V5,5/6*V5
1/8*V5,1/6*V5
2/8*V5,2/6*V5
6/8*V5,4/6*V5
7/8*V5,5/6*V5
10
LCD Power Supply Pins
Pin Name
I/O
Function
No. of Pins
CAP1+
O
DC/DC voltage converter. Connect a capacitor between this terminal and
the CAP1- terminal.
4
CAP1–
O
DC/DC voltage converter. Connect a capacitor between this terminal and
the CAP1+ terminal.
2
CAP2+
O
DC/DC voltage converter. Connect a capacitor between this terminal and
the CAP2- terminal.
2
CAP2–
O
DC/DC voltage converter. Connect a capacitor between this terminal and
the CAP2+ terminal.
2
CAP3–
O
DC/DC voltage converter. Connect a capacitor between this terminal and
the CAP1+ terminal.
2
CAP4–
O
DC/DC voltage converter. Connect a capacitor between this terminal and
the CAP2+ terminal.
2
CAP5–
O
DC/DC voltage converter. Connect a capacitor between this terminal and
the CAP1+ terminal.
2
VOUT
O
DC/DC voltage converter. Connect a capacitor between this terminal and
VSS.
2
VR
I
Output voltage regulator terminal. Provides the voltage between VDD and
V5 through a resistive voltage divider.
IRS = “L” : the V5 voltage regulator internal resistors are not used .
IRS = “H” : the V5 voltage regulator internal resistors are used .
2
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