CL-PS7110-VI-A View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CL-PS7110-VI-A

Low-Power System-on-a-Chip

Cirrus Logic 

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CL-PS7110

Low-Power System-on-a-Chip

Now the panel can be connected and the contrast fine-tuned by changing the Pump Control register value

for the appropriate drive output.

VDD

VDD

+VEE

C2

2.2µ

4

C78

10 µF

GND GND

R55

R

L3

47 µH

R53

100 k

D12

1N5818

3

1

2

R54

330 k

VREF

4

-

5+

3

C44

100 n

GND

UI3A

2

LM339

R65

R64

R74

100 k

806 k

392 k

R63

200 k

R62

100 k

GND GND

U19

DRIVE1

FB1

82 DRIVE0

81 DRIVE1

87 FB0

86 FB1

R75

100 k

GND 64 PD4

63 PD5

62 PD6

61 PD7

CL-PS7110

Figure 1-6. Sample Schematic for Positive VEE Control Circuitry

Example 2

Resistor

R73

R53

R54

R56

R62–65

Notes

Pull down for positive VEE.

Pull up for LM339 open-drain output.

Selects a voltage at the terminal of the comparator, at

which point the feedback output switches off (high), thus

turning off the Drive output.

Selects voltage level on input of comparator to applica-

tion VREF(1.5 V).

This resistor network allows VEE to be programmed

under program control. If all outputs are low, VEE is at the

maximum. Turning on the outputs increases the voltage

at the comparator, and therefore decreases VEE.

May 1997

DATA BOOK v1.5

25

FUNCTIONAL DESCRIPTION

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