ROHM BU9798KV Technical data

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Multifunction LCD Segment Driver

BU97930MUV MAX 108 segments (SEG27×COM4)

●Features

 Integrated RAM for display data (DDRAM):

27 x 4 bit (Max 108 Segment)

 LCD drive output:

4 Common output, Max 27 Segment output

 Integrated 1ch LED driver circuit
 Segment /GPO(Max 4port) output mode selectable
 Support PWM generation from ext. or internal clock

(Resolution: 8bit)

 Support standby mode
 Integrated Power-on-Reset circuit (POR)
 Integrated Oscillator circuit
 No external component
 Low power consumption design
 Independent power supply for LCD driving
 Support Blink function

(Blink frequency 1.6, 2.0, 2.6, 4.0Hz selectable)

●Applications

 Telephone
 FAX
 Portable equipment (POS, ECR, PDA etc.)
 DSC
 DVC
 Car audio
 Home electrical appliance
 Meter equipment

etc.

●Ty pical A pplication Circuit

LED/GPO using case

5.0V

3.3V

VSS

VLCD

VDD

BU97930MUV

Input signal from controlle

INHb

●Key Specifications

■ Supply Voltage Range: +1.8V to +3.6V

■ LCD drive power supply Range: +2.7V to +5.5V

■ Operating Temperature Range: -40°C to +85°C

■ Max Segments: 108 Segments

■ Display Duty: Static, 1/3, 1/4 selectable

■ Bias: Static, 1/3

■ Interface: 3wire serial interface

●Package W (Typ.) x D (Typ.) x H (Max.)

QFN040V6060

6.00mm x 6.00mm x 1.00mm

VLED=5.0V

arding resistor value

*Re

Please detect the value accordin

ut current value

in

LED

SEG26

GPO1

to

GPO4

SEG23

to

to

SEG

COM3

22

CLKINCSB SD SCL

CLKIN

＊

External CLK input terminal

If not in use, , connect to VSS or o

SEG0

COM0

Datashee

to

current MAX = 20m

Othe

device

LCD

en .

Figure 1. T ypical application circuit

○Product structure：Silicon monolithic integrated circuit ○This product is not designed for protection against radioactive rays.

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Datasheet

BU97930MUV MAX 108 segments (SEG27×COM4)

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Datasheet

●Block Diagram / Pin Configuration / Pin Description

VLCD

LCD voltage

G enerator

COM0……COM3

common

drive

SEG0 …...22 SEG23...26

Segment

driver

LCD

BIAS

SELECTOR

common

counter

blink timing

generator

GPO data latch

divider

(Div.2)

Command

Data

CSB

Decoder

serial inter face

IF FILTER

SD

Power On

Reset

INHb

CLKIN

VDD

VSS

VSS

CR O

OS C block

kHz

DDRAM

SCL

Segment

driver/GPO

Controlle

GPO

LED

LED

drive

PWM

Generator

CSB

SCL

SD

VDD

INHb

CLKIN

VLCD

COM0

COM1

COM2

40

VSS COM3

39

LED SEG0

38

SEG26 SEG1

37

SEG25 SEG2

36

SEG24 SEG3

35

SEG23 SEG4

34

SEG22 SEG5

33

SEG21 SEG6

32

SEG20 SEG7

31

SEG19 SEG8

SEG18

SEG17

SEG16

EXT-PAD

SEG15

SEG14

SEG13

SEG12

SEG11

11

12

13

14

15

16

17

18

19

20

SEG10

SEG9

Figure 2. Block Diagram Figure 3. Pin Configuration (BOTTOM VIEW)

Table 1 Pin Description

Terminal

CSB 1 I - Chip select: "L" active

SCL 2 I - Serial data transfer clock

SD 3 I - Input serial data

VDD 4 - - Power supply for LOGIC

CLKIN 6 I OPEN / VSS

VSS 40 - - GND

VLCD 7 - - Power supply for LCD

INHb 5 I VDD

COM0 to 3 8 to 11 O OPEN COMMON output for LCD

Terminal

number

I/O unused case Function

External clock input terminal (for display/PWM using selectable);
Support Hi-Z input mode at internal clock mode

Display turning on/off select terminal
H: turning on display, L: turning off display

INHb = “L”: All SEG/COM terminals : output VSS level
GPO terminal : output VSS level
LED drive terminal : output Hi-Z

SEG0 to 22 12 to 34 O OPEN SEGMENT output for LCD

SEG23 to 26 35 to 38 O OPEN SEGMENT output for LCD/GPO

LED 39 O OPEN LED driver output

EXT-PAD - - VSS substrate

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Datasheet

BU97930MUV MAX 108 segments (SEG27×COM4)

●Absolute Maximum Ratings (VSS=0V)

Parameter Symbol Ratings Unit Remarks

Power supply voltage 1 VDD -0.3 to +4.5 V Power supply
Power supply voltage 2 VLCD -0.5 to +7.0 V Power supply for LCD
Power Dissipation Pd 0.8*
Input voltage range VIN -0.5 to VDD+0.5 V
Operational temperature range Topr -40 to +85 ℃
Storage temperature range Tstg -55 to +125 ℃

Iout1 5 mA SEG output

Output current

*1 When operated higher than Ta=25℃, subtract 8.0mW per degree. (using ROHM standard board)
(board size: 74.2mm×74.2mm×1.6mm material: FR4 board copper foil: land pattern only).

●Recommended Operating Ratings(Ta=-40°C to +85°C,VSS=0V)

Parameter Symbol

Power supply voltage 1 VDD 1.8 - 3.6 V Power supply
Power supply voltage 2 VLCD 2.7 - 5.5 V Power supply for LCD
Output current Iout4 - - 20 mA Per LED port 1ch

●Electrical Characteristics

DC characteristics (Ta=-40°C to +85°C, VDD=1.8V to 3.6V, VLCD=2.7V to 5.5V, VSS=0)

Parameter Symbol

“H” level input voltage VIH 0.8VDD - VDD V SD, SCL, CSB, CLKIN, INHb
“L” level input voltage VIL VSS - 0.2VDD V SD, SCL, CSB, CLKIN, INHb
Hysteresis width VH - 0.2 - V SCL, INHb, VDD=3.3V, Ta=25°C

“H” level input current IIH1 - - 5 µA
“L” level input current IIL1 -5 - - µA

VOH1

“H” level output voltage
(*2)

“L” level output voltage
(*2)

Current consumption
(*1)

*1 Power save mode 1 and frame inversion setting *2 Iload: In this case, load current from only one port

VOH2
VOH3

VOL1 - - 0.4 V
VOL2 - - 0.4 V
VOL3 - - 0.5 V
VOL4 - 0.11 0.5 V

IstVDD - 3 10 µA

IstVLCD - 0.5 5 µA

IVDD1 - 8 15 µA

IVDD2 - 30 45 µA

IVLCD1 - 10 15 µA

IVLCD2 - 30 48 µA

Iout2 5 mA COM output
Iout3 10 mA GPO output
Iout4 50 mA LED output

Ratings

MIN TYP MAX

Limit

MIN TYP MAX

VLCD

-0.4

VLCD

-0.4

VLCD

-0.6

- - V

- - V

- - V

1

Unit Remarks

Unit Condition

W

SD, SCL, CSB, CLKIN,
INHb, VI=3.6V
SD, SCL, CSB, CLKIN,
INHb, VI=0V
Iload=-50µA, VLCD=5.0V
SEG0 to SEG26
Iload=-50µA, VLCD=5.0V,
COM0 to COM3
Iload=-1mA,VLCD=5.0V,
SEG23 to SEG26(GPO mode)
Iload= 50µA, VLCD=5.0V,
SEG0 to SEG26
Iload= 50µA, VLCD=5.0V,
COM0 to COM3
Iload=1mA, VLCD=5.0V,
SEG23 to SEG26(GPO mode)
Iload=20mA, VLCD=5.0V,
LED
Input terminal ALL’L’,
Display off, Oscillation off
Input terminal ALL’L’,
Display off, Oscillation off
VDD=3.3V, Ta=25°C, 1/3bias, fFR=64Hz,
PWM generate off, All output pin open
VDD=3.3V, Ta=25°C, 1/3bias, fFR=64Hz,
PWM Frequency=500Hz setting,
All output pin open
VLCD=5.0V, Ta=25°C, 1/3bias, fFR=64Hz,
LED generate off, All output pin open
VLCD=5.0V , Ta=25℃, 1/3bias, fFR=64Hz,
PWM Frequency=500Hz setting,
All output pin open

Datasheet

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Datasheet

BU97930MUV MAX 108 segments (SEG27×COM4)

W

f

●Electrical Characteristics – continued

Oscillation Frequency Characteristics (Ta=-40°C to +85°C, VDD=1.8V to 3.6V, VLCD=2.7V to 5.5V, VSS=0)

Parameter Symbol

Frame frequency 1 fFR1 57.6 64 70.4 Hz
Frame frequency 2 fFR2 51.2 64 73.0 Hz
Frame frequency 3 fFR3 45.0 - 64 Hz

MPU interface Characteristics (Ta=-40°C to +85°C, VDD=1.8V to 3.6V, VLCD=2.7V to 5.5V, VSS=0)

Parameter Symbol

Input rise time tr - - 50 ns
Input fall time tf - - 50 ns
SCL cycle time tSCYC 250 - - ns
“H” SCL pulse width tSHW 50 - - ns
“L” SCL pulse width tSLW 50 - - ns
SD setup time tSDS 50 - - ns
SD hold time tSDH 50 - - ns
CSB setup time tCSS 50 - - ns
CSB hold time tCSH 50 - - ns
“H” CSB pulse width tCHW 50 - - ns

CSB

SCL

SD

tCSS

t

tSL

tSDS tSDH

MIN MIN MIN

MIN TYP MAX

tSCYC

tSHW

Limit

Limit

Unit Condition

VDD=3.3V, Ta=25°C, fFR=64Hz setting
VDD=2.5 to 3.6V fFR=64Hz setting
VDD=1.8 to 2.5V fFR=64Hz setting

unit Condition

tCSH

tr

Datasheet

tCHW

Figure 4. Serial interface timing

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Datasheet

BU97930MUV MAX 108 segments (SEG27×COM4)

●I/O equivalent circuit

VLCD

VSS

VDD

CSB, SD,
SCL,INHb

CLKIN

VSS

VLCD

SEG23-26

VSS

VDD

VSS

VLCD

SEG0-22

COM0-3

VSS

LED

VSS

Datasheet

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Figure 5. I/O equivalent circuit

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Datasheet

BU97930MUV MAX 108 segments (SEG27×COM4)

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●Example of recommended circuit

1) LED/GPO operation

2) SEG output only operation

5.0 V

3. 3V

VSS

VLCD
VDD

BU97930MUV

Input signal from controlle

INHb

LED

CLKINCSB SD SCL

CLKIN

＊

External CLK input terminal

In case being unused, connect to VSS

VLED =5. 0V

*Regarding resistor value

Please detect the value according to

input current value (

SEG26(GPO

to

SEG0

COM0 to COM3

1)

SEG23( GPO 4)

SEG22

to

Datasheet

current MAX = 20mA)

Othe

device

LCD

or be opened

.

VLCD

LED

VDD

OPEN if unused

BU97930MUV

5.0V 3.3V

VSS

Input signal from controller

INHb

CLKINCSB SD SCL

CLKIN

＊

External CLK input terminal
connect to VSS or open. If unused

SEG0

COM0toCOM3

Figure 6. Example of Recommended Circuit

to

SEG26

LCD

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Datasheet

BU97930MUV MAX 108 segments (SEG27×COM4)

CD/C

3

0

4D6D5

2

Datasheet

●Function description

○Command and data transfer method
○3-SPI (3-wire serial interface)

This device is controlled by a 3-wire signal (CSB, SCL, and SD).
First, Interface counter is initialized with CSB=“H".
Setting CSB=”L”, enables SD and SCL inputs.
The protocol of 3-SPI transfer is as follows.
Each command starts with Command or Data judgment bit (D/C) as MSB data,
followed by data D6 to D0 (this is when CSB =”L”).
(Internal data is latched at the rising edge of SCL, serial data is converted to an 8-bit parallel data at the falling edge of
the 8th CLK.)

When CSB changes from “L” to “H”, and at this time serial commands are less than 8 bits, command and data transfers
are cancelled. To start sending command again, please set CSB=”L" and send command continuously.

After sending RAMWR or BLKWR or GPOSET command, this device is in the RAM data input mode. Under this mode,
device can not accept new commands.

In this case, execute a “H” to “L” transition at CSB, after this sequence, the device is released from RAM data input mode,
and can accept new command.

CSB

1st byte Command 2nd byte Command

3rd byte Command

SCL

SD

D/C

D3 D6D0 D0

D

D2

D/

D1 D

D5

D6D5D4D

D/CD4 D3 D2 D1

D1 D

D6

Figure 7. 3-SPI Data transfer Format

* 8-bit data, sending after RAMWR command, are display RAM data
* 8-bit data, sending after BLKWR command, are blink RAM data
* SCL and SD can be set to “H” or cleared to “L” during CSB=”H”.

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Datasheet

BU97930MUV MAX 108 segments (SEG27×COM4)

A

A

A

A

j

Datasheet

○Write display data and transfer method

This device has Display Data RAM (DDRAM) of 28×4=112bit.
The relationship between data input and display data, DDRAM data and address are as follows.

Command

1st Byte

10000011

ddress set

2nd Byte

Command

00000000

Command

10100000

RAM Write

a

b

Display RAM data

c

de

g

h

f

i

kl m

no

…

p

According to this command, an 8-bit binary data will be written to the DDRAM. The starting address of the DDRAM where
data will be written is specified by “ADSET” command, and is automatically incremented for every 4 bits of data received..

Writing data to DDRAM can be done by continuously sending data.
(In case data is sent continuously after write date at 1Ah (SEG26), RAM data will be written to 1Bh (dummy address)
and return to address 00h (SEG0) automatically.)

In case SEG port assigned to GPO port by OUTSET command, corresponding SEG address do not change and used as
dummy address.

DDRAM address

00 01 02 03 04 05 06 07

・・・

0 a e i m
1 b f j n
2 c g k o

BIT

3 d h l p

SEG

SEG

0

1

SEG

2

SEG

3

SEG4SEG5SEG6SEG

・・・

7

19h 1Ah 1Bh

SEG

25

SEG

26

ADDRESS

DUMMY

Display data write to DDRAM every 4 bits.
In case CSB changes from ”L” to ”H” before 4 bits of data transfer was finished, RAM write is cancelled.

Command

Display data

CSB

1st byte Command / 2nd byte Command

COM0
COM1
COM2
COM3

SCL

SD D2 D5 D4 D3 D2 D1 D0

Internal
signal
RAM write

Address set command RAMWR command

Command

RAMWR command

CSB

SCL

Internal
signal
RAM write

1st byte Command / 2nd byte Command

Address set command

D6 D5 D4 D3D7 D1

ddress 00h

D7 D6SD

D4 D3 D2 D0

Address 00h

ddress 01h

RAM write every 4bit

Address 30h

D0 D7

D6

ddress 02h

Display data

D7

Address 31h

data lower than 4bit case

RAM write is canceled

D5

D5 D6

D4D4 D2 D1D5 D3

Addres00h

Auto increment

Return to address 00h

Figure 8. Display Data Transfer Method

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Datasheet

BU97930MUV MAX 108 segments (SEG27×COM4)

○Blink function

This device has Blink function. Blink function can set each segment port individually.
Blink ON/OFF and Blink frequency are set by the BLKSET command.
Blink frequency varies according to fCLK characteristics.
Blink setup of each segment is controlled by BLKWR command.

The write start address is specified by “BLKADSET” command. And this address will automatically increment every 4 bits
of blink data received. The relation of BLKWR command, blink ram data, and blinking segment port is below.

In case data is “1”, segment will blink, on the other hand when data is “0”, segment will not blink.
(In case data is written continuously after write data at 1Ah (SEG26), RAM data will be written to 1Bh (dummy address)
and return to address 00h (SEG0) automatically.)

Please refer to the following figures about Blink operation of each segment.
In case SEG port assigned to GPO port by OUTSET command, corresponding SEG address does not change and used

as dummy address.

1st Byte

Command

10000100

Command

Blink set

2nd Byte

00000011

1st Byte

Command

10000111

2nd Byte

Command

00000000

Blink Address set

Command

11000000

Blink

RAMWR

a

b

d

c

Blink RAM data

g

f

e

h i

j

k

m

n o

l

Blink RAM address

00 01 02 03 04 05 06 07

0 a e i m

・・・

19h 1Ah 1Bh

ADDRESS

DUMMY

1 b f j n COM1
2 c g k o COM2

BIT

3 d h l p COM3

SEG 0 SEG 1 SEG 2 SEG 3 SEG4 SEG5 SEG6 SEG

7

SEG

25

SEG

26

Datasheet

…

p

COM0

DDRAM data

SEG A SEG B SEG C SEG D

Blink RAM data

SEG A SEG B SEG C SEG D

Segment output

SEG A SEG B SEG C SEG D SEG A SEG B SEG C SEG D SEG A SEG B SEG C SEG D SEG A SEG B SEG C SEG D

under the 2Hz stting segment output will blink every 0.5 second (ON->OFF->ON)

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Blink frequency

Figure 9. Blink Operation

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Datasheet

BU97930MUV MAX 108 segments (SEG27×COM4)

○LCD Driver Bias/Duty Circuit

BU97930MUV generates LCD driving voltage using an on-chip Buffer AMP.
Also, it can drive LCD with low power consumption

*Line and frame inversion can be set by MODESET command.
*1/4duty, 1/3duty and static mode can be set by DISCTL command.

About each LCD driving waveform, please refer to “LCD driving waveform” descriptions.

○Initial state

Initial state after SWRST command input

○Display off
○All command register values are in Reset state.
○DDRAM address data and Blink address data are initialized

(DDRAM data and Blink RAM data are not initializing.
Please write DDRAM data and Blink RAM data before Display on.)

●Command / Function list

Function description table

NO Command Function

1 Mode Set (MODESET) Sets LCD drive mode (display on/off, current mode)
2 Display control (DISCTL)
3 Address set (ADSET)

4 Blink set (BLKSET)
5 Blink address set (BLKADSET)

SEG/GPO port change

6

(OUTSET)
LED drive control (PWMSET)

7

(H piece adjustment of PWM)

8 RAM WRITE (RAMWR) Writes display data to display data RAM

9 Blink RAM WRITE (BLKWR) Writes Blink data to BLINK data RAM
10 All Pixel ON (APON) Sets all Pixel display on
11 All Pixel OFF (APOFF) Sets all Pixel display off
12 All Pixel On/Off mode off (NORON)
13 Software Reset (SWRST) Software Reset
14

OSC external input (OSCSET)

15 GPO output set (GPOSET) Sets GPO output data

Sets LCD drive mode
(frame freq., line/frame inversion)

Sets display data RAM address for RAMWR command
Sets Blink mode on/off
Sets Blink data RAM address for BLKWR command

Selects segment output/general purpose output (GPO)
Sets PWM1 signal “H” width for LED driving

Sets normal display mode (APON/APOFF cancel)

Enables External clock input

Datasheet

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