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MSM5265

80-DOT LCD DRIVER

Oki Electric Industry 

¡ Semiconductor

MSM5265

• VLC2

Supply voltage pin for the 80 sets of LCD drivers. The input level to this pin should be the low

level output voltage of segment outputs (SEG1 to SEG80) and common outputs (COM-A,

COM-B).

In this case, the high level of segment outputs and common outputs is the VDD level, while

low level of segment outputs and common outputs is VLC2 level. VLC2 should be set at higher

level than ground level.

• VLC1

Supply voltage pin for the middle level voltage of the common outputs. The input level of this

pin is the middle level output voltage of the common outputs (COM-A, COM-B) in the 1/2

duty dynamic display mode.

The value of VLC1 is calculated by the following formula:

VLC1 = (VDD + VLC2)/2

In the static display mode, this pin should be open.

• COM-A, COM-B

LCD driving common signals are output from these pins. These pins should be connected to

the common side of the LCD panel.

– In the static display mode

A pulse in phase with the COM-OUT output is output from both COM-A and COM-B. In

this case, the high level is VDD, and the low level is VLC2.

– In the 1/2 duty dynamic display mode

The COM-A and COM-B output signals are alternately changed within each COM-OUT

output cycle, resulting in alternate repetition of select and non-select modes.

In the select mode, a signal in phase with the COM-OUT signal is output at "H" (VDD) and

"L" (VLC2).

In the non-select mode, a voltage is output at "M" (VLC1). In the select mode of COM-A

(non-select mode of COM-B), signals that correspond to the 1st- to 80th-bit data of the data

latch are output to the segment outputs.

In the select mode of COM-B (non-select mode of COM-A), signals that correspond to the

81st- to 160th-bit data of the data latch are output to the segment outputs.

Dynamic display mode

(D/S : "H")

Static display mode

(D/S : "L")

COM-OUT

COM-A

COM-B

VDD

VLC1

VLC2

VDD

VLC1

VLC2

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