ST7637 datasheet(14/210 Pages) SITRONIX

14 / 210 page

ST7637

Ver 1.6

14/210

2009/03

6. PIN DESCRIPTION

6.1

Power Supply

Name

I/O

Description

VDD

Supply

Power supply for logic circuit.

VDD1

Supply

Power supply for OSC circuit.

VDD2

Supply

Power supply for Booster circuit.

VDD3

Supply

Power supply for LCD.

VDD4

Supply

Power supply for LCD.

VDD5

Supply

Power supply for LCD.

VSS

Supply

Ground for logic circuit. Ground system should be connected together.

VSS1

Supply

Ground for OSC circuit. Ground system should be connected together.

VSS2

Supply

Ground for Booster circuit. Ground system should be connected together.

VSS4

Supply

Ground for LCD. Ground system should be connected together.

6.2

LCD Power Supply Pins

Name

I/O

Description

V0OUT

V0IN

V0S

I/O

Positive LCD driver supply voltages.

V0OUT is the output voltage of V0 generated by ST7637.

V0IN is the input pin of power supply to generate V0 voltage for LCD.

V0S is the input pin of power supply to sense the V0 voltage.

V0OUT 、V0IN & V0S should be connected together by FPC.

XV0OUT

XV0IN

XV0S

I/O

Negative LCD driver supply voltages.

XV0OUT is the output voltage of XV0 generated by ST7637.

XV0IN is the input pin of power supply to generate XV0 voltage for LCD.

XV0S is the input pin of power supply to sense the XV0 voltage.

XV0OUT 、XV0IN & XV0S should be connected together by FPC.

VgOUT

VgIN

VgS

I/O

Bias LCD driver supply voltages.

VgOUT is the output voltage of Vg generated by ST7637.

VgIN is the input pin of power supply to generate Vg voltage for LCD.

VgS is the input pin of power supply to sense the Vg voltage.

VgOUT 、VgIN & VgS should be connected together by FPC.

Vm is the I/O pin of LCD bias supply voltage

Voltages should have the following relationship;

V0 ＞ Vg ＞ Vm ＞ VSS ＞ XV0.

VDDA-0.7V＞Vm＞0.7V.

VddA <3V:2 x VDDA

≧

≧3V ; VddA ≧3V:2 x VDDA

≧

>1.8V

When the internal power circuit is active, these voltages are generated as following table according

to the state of LCD bias.

NOTE: N = 5 to 12

LCD bias

1/N bias

(2/N) x V0

(1/N) x V0

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