LC7940YC Datasheet, PDF (8/13 Pages) Sanyo Semicon Device – Dot-matrix LCD Drivers

Pin No.
LC7940YC LC7941YC
93
88
85
96
82
99
Symbol
M
P/S
CDO
1 to 80
80 to 1
Ol to O80
84
97
DISPOFF
81
91
NC
83
98
NC
90
100
NC
LC7940YC, LC7941YC
I/O
Function
I
LCD panel drive voltage output alternation control signal.
I
Data input mode select. 4–bit parallel input when HIGH, and serial input when LOW
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.
LCD drive outputs.
The output drive level is determined by the display data, M signal and DISP OFF
input as shown below.
M
Q
DISP OFF
Output
LOW
LOW
HIGH
V₃
O
LOW
HIGH
HIGH
V₁
HIGH
LOW
HIGH
V₄
HIGH
HIGH
HIGH
V_EE
×
×
LOW
V₁
Note
x = don’t care (tied HIGH or LOW)
I
O1 to O80 output control input pin.
When LOW, V1 is output on the O1 to 080 outputs, See the truth table.
–
No connection.
No. 6157—8/13