BU91520KV-M Datasheet, PDF(5/45 Page) Rohm – Low Duty LCD Segment Driver

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BU91520KV-M Datasheet, PDF (5/45 Pages) Rohm – Low Duty LCD Segment Driver

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BU91520KV-M

1. When SCL is stopped at the low level

SCE

SCL

SDI

SDO

VIH1

VIL1

VIH1

VIL1

tccyc

tchw

tclww

tds

tdh

2. When SCL is stopped at the high level

SCL

VIH1

VIL1

tccyc

tclww

tchw

SDI

VIH1

VIL1

tds

tdh

SDO

VIH1

tcs

tclwr

VIL1

tch

tclwr

tcp

VOL5

tdc

tdr

VIL1

tch

VOL5

tdc

tdr

Pin Description

Symbol

S1/P1/G1 to

S6/P6/G6

S7 to S55

S67,S68

KS1/S56 to

KS6/S61

KI1/S62 to

KI5/S66

COM1 to COM4

S69/OSC

SCE

SCL

SDI

SDO

Figure 5. Serial Interface Timing

Pin No.

79,80,

1 to 4,

5 to 53,

69,71

54 to 59

60 to 64

65 to 68

Function

Active

I/O

Handling

when unused

Segment output for displaying the display data transferred

OPEN

by serial data input. The S1/P1/G1 to S6/P6/G6 pins can

also be used as General-purpose outputs when so set up

by the control data.

Segment output for displaying the display data transferred

OPEN

by serial data input.

Key scan outputs

OPEN

Although normal key scan timing lines require diodes to be

inserted in the timing lines to prevent shorts, since these

outputs are unbalanced CMOS transistor outputs, these

outputs will not be damaged by shorting when these outputs

are used to form a key matrix. The KS1/S56 to KS6/S61

pins can be used as segment outputs when so specified by

the control data.

Key scan inputs

I/O

OPEN

These pins have built-in pull-down resistors.

The KI1/S62 to KI5/S66 pins can be used as segment

outputs when so specified by the control data.

Common driver output pins. The frame frequency is fo[Hz].

OPEN

Segment output for displaying the display data transferred

I/O

OPEN

by serial data input.

The pin S69/OSC can be used external frequency input pin

when set up by the control data.

Serial data transfer inputs. Must be connected to the

controller.

SCE: Chip enable

SCL: Clock for serial data transfer.

SDI: Transfer data

Output data

OPEN

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