LC7940YC, LC7941YC

No. 6157—8/13

93

88

M

I

LCD panel drive voltage output alternation control signal.

85

96

P/S

I

Data input mode select. 4–bit parallel input when HIGH, and serial input when LOW

82

99

CDO

O

Cascade connection pin for extension segment drivers. Data is read out when HIGH.

Goes LOW after data is read out. Connected to the CDI input of the next chip.

1 to 80

80 to 1

Ol to O80

O

LCD drive outputs.

The output drive level is determined by the display data, M signal and DISP OFF

input as shown below.

Note

x = don’t care (tied HIGH or LOW)

84

97

DISPOFF

I

O1 to O80 output control input pin.

When LOW, V1 is output on the O1 to 080 outputs, See the truth table.

81

91

NC

–

No connection.

83

98

NC

90

100

NC

Pin No.

Symbol

I/O

Function

LC7940YC

LC7941YC

M

Q

DISP OFF

Output

LOW

LOW

HIGH

LOW

HIGH

HIGH

HIGH

LOW

HIGH

HIGH

HIGH

HIGH

××

LOW