BD60910GU-E2_技术文档

LED Drivers for LCD Backlights

White backlight LED Drivers

for Small to Medium LCD Panels

(Switching Regulator Type)

BD60910GU

No.11040EBT30

●Description

BD60910GU is maximum 8LED(minimum 4LED) serial LED driver with ALC (Auto Luminous Control) function.

Best match for mobile application that needs long battery life.

●Features

1) Boost DC/DC for LED back lighting

Drives maximum 8 to minimum 4 serial LEDs.

Integrated high voltage switching transistor

Soft start function.

Over voltage protection (Detect voltage is controllable)

Over current protection (2nd side)

VOUT short to GND protection

VOUT open protection.

2) Constant current driver for LED back lighting

Current step can be set in 7bit(0.2mA 128steps), and 8bit(0.1mA 256steps) in sloping.

Rise and fall time of sloping are set independently.

Iout max = 25.6mA

PWM brightness control by external input.

3) Auto Luminous Control (ALC)

Periodic ambient detection reduces sensor consumption current.

LED brightness can be controlled by 16steps ambient brightness level.

LED current for each ambient level is freely customizable.

SBIAS for sensor bias is integrated. (3.0V or 2.6V)

Photo Diode, Photo Transistor, Photo IC(Linear/ Logarithm) can be connected.

Automatic gain control built-in, so BH1600FVC can be connected directly.

4) Thermal shutdown (Auto-return type)

5) I²C BUS FS mode（max 400kHz）Write/Read

6) VCSP85H3(3.00mm x 3.00mm) Small Size CSP package

●Absolute Maximum Ratings (Ta=25 ℃)

Parameter

Symbol

Ratings

Unit

Pins

Maximum voltage 1

VMAX1

VMAX2

VMAX3

Pd

7

15

V

except for VLED VOUT, SW

VLED

Maximum voltage 2

Maximum voltage 3

40

V

VOUT, SW

Power Dissipation

1250 ^*1

-40 ~ +85

-55 ~ +150

mW

℃

Operating Temperature Range

Storage Temperature Range

Topr

Tstg

*1) Power dissipation deleting is 10mW/ ℃, when it’s used in over 25 ℃. It’s deleting is on the board that is ROHM’s standard.

Dissipation by LSI should not exceed tolerance level of Pd.

●Operating conditions (VBAT≥VIO, Ta=-40~85 ℃)

Parameter

Symbol

Ratings

Unit

VBAT input voltage

VIO pin voltage

VBAT

VIO

2.7~5.5

V

1.65~3.3

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2011.07 - Rev.B

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BD60910GU

Technical Note

●Electrical Characteristics (Unless otherwise specified, Ta=25°C, VBAT=3.6V, VIO=1.8V)

Limits

Parameter

【Circuit Current】

Symbol

Unit

Condition

Min.

Typ.

Max.

VBAT Circuit current 1

VBAT Circuit current 2

VBAT Circuit current 3

IBAT1

IBAT2

IBAT3

-

0.1

0.5

3.5

1.0

3.0

5.0

μA

RESETB=0V, VIO=0V

RESETB=0V, VIO=1.8V

LED=ON, ILED=15mA setting

Vo=24V

mA

Only ALC block ON

ADCYC=0.52s setting

Except sensor current

VBAT Circuit current 4

IBAT4

-

0.4

1.0

mA

【LED Driver】

LED current Step (Setup)

LED current Step (At slope)

LED Maximum current

ILEDSTP1

ILEDSTP2

IMAXWLED

IWLED

128

256

25.6

15

Step

mA

-

LED current accuracy

【DC/DC】

-7%

+7%

mA

I_LED=15mA setting

VLED pin feedback voltage

Vfb

OCP

fosc

-

0.3

650

1.0

-

V

Over current protection

Oscillator frequency

mA

MHz

0.8

1.2

OVP1

OVP2

OVP3

OVP4

OVP5

30

-

31

27

24

21

18

32

-

V

Over Voltage Protection detect

voltage

Maximum Duty

Mduty

OVO

92.5

-

%

V

VOUT open protection

0.7

1.4

●Electrical Characteristics (Unless otherwise specified, Ta=25°C, VBAT=3.6V, VIO=1.8V)

Limits

Parameter

Symbol

Unit

Condition

Min.

Typ.

Max.

【I²C Input (SDA, SCL)】

0.25 ×

VIO

LOW level input voltage

VIL

VIH

Vhys

VOL

lin

-0.3

-

V

0.75 ×

VIO

VBAT

+0.3

HIGH level input voltage

Hysteresis of Schmitt trigger

input

0.05 ×

VIO

-

0.3

3

V

LOW level output voltage

(SDA) at 3mA sink current

0

V

Input current each I/O pin

【RESETB】

-3

μA

Input voltage = 0.1×VIO~0.9×VIO

0.25 ×

VIO

LOW level input voltage

VIL

VIH

Iin

-0.3

-

V

0.75 ×

VIO

VBAT

+0.3

HIGH level input voltage

Input current each I/O pin

-3

3

μA

Input voltage = 0.1×VIO~0.9×VIO

2011.07 - Rev.B

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BD60910GU

Technical Note

●Electrical Characteristics (Unless otherwise specified, Ta=25°C, VBAT=3.6V, VIO=1.8V)

Limits

Parameter

Symbol

Unit

Condition

Min.

Typ.

Max.

【ALC】

2.850

2.470

3.0

2.6

3.150

2.730

V

Io=200μA <Initial value>

Io=200μA

SBIAS Output voltage

SBIAS Output current

SSENS Input range

VoS

IoS

-

0

-

30

mA

V

Vo=3.0V

VoS x

255/256

VISS

SBIAS Discharge resister at

OFF

ROFFS

ADRES

ADINL

ADDNL

RSSENS

1.0

8

-

1.5

kΩ

ADC resolution

bit

ADC non-linearity error

-3

-1

1

+3

+1

-

LSB

MΩ

ADC differential non-linearity

error

-

SSENS Input impedance

【WPWMIN】

-

L level input voltage

VILA

VIHA

-0.3

1.4

-

0.3

V

VBAT

+0.3

H level input voltage

Input current

IinA

3.6

-

10

-

μA

μs

Vin=1.8V

PWM input minimum High

pulse width

PWpwm

50

【GC1, GC2】

L level output voltage

VOLS

VOHS

-

0.2

-

V

IOL=1mA

IOH=1mA

VoS

-0.2

H level output voltage

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2011.07 - Rev.B

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BD60910GU

Technical Note

●Block Diagram / Application Circuit example

VBAT

RB520S-40

1μF(50V)

22μH

VBAT1

VBAT2

OCP

10µF

VIO

DC/DC

OVP

(

)

(

)

(

RESETB

SCL

SDA

Level

Shift

I²C interface

Digital Control

I/O

Feed Back

VLED

External PWM

WPWMIN

LEDGND

SBIAS

Photo IC

TSD

VDD

GND

IOUT

1μF

GC1

GC2

GND1

GND2

VREF

IREF

SSENS

SGND

Sensor

I/F

ALC

BH1600FVC

GC2

GC1

* The example when using BH1600FVC and assuming brightness range

10(lx)-50000(lx) by the panel of 20% transmissivity

Fig.1 Block Diagram / Application Circuit example

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2011.07 - Rev.B

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BD60910GU

Technical Note

●Pin Arrangement [Bottom View］

T4

VIO

GND2

SCL

GNDP

SW

T3

E

D

C

B

A

RESETB GNDPS VBAT2

GND1

WPWMIN

SDA

VOUT

GC1

GC2

SGND

index

SBIAS SSENS

T1

VBAT1 LEDGND VLED

T2

1

2

3

4

5

Fig.2 Pin Arrangement

●Pin Functions

ESD Diode

Equivalent

Circuit

No

Ball No.

Pin Name

VBAT1

I/O

Functions

For Power

For Ground

1

2

A2

D5

D1

C1

E2

A3

E3

D4

C5

D3

C2

-

GND

Power supply

A

C

B

H

I

VBAT2

VIO

-

GND

3

-

VBAT

GND

Power supply for I/O

Ground

4

GND1

GND2

LEDGND

GNDP

GNDPS

SGND

RESETB

SDA

-

5

-

Ground

6

-

Ground

7

-

Ground

8

-

Ground

9

-

Ground

10

11

I

GND

Reset input (L: reset, H: reset cancel)

I²C data input / output

I/O

12

13

14

15

16

17

18

19

20

21

22

23

24

D2

B1

E4

C3

A4

B4

B5

B3

C4

A1

A5

E5

E1

SCL

I

VBAT

-

GND

I²C clock input

H

L

WPWMIN

SW

External PWM input

O

I

DC/DC Switching port

A

E

Q

N

X

S

M

N

S

VOUT

VLED

SBIAS

SSENS

GC1

GC2

T1

-

DC/DC output voltage monitor

LED cathode connection

-

O

I

VBAT

Bias output for the Ambient Light Sensor

Ambient Light Sensor input

Ambient Light Sensor gain control output 1

Ambient Light Sensor gain control output 2

Test Input Pin (short to Ground)

Test Output Pin (Open)

O

I

T2

O

I

T3

Test Output Pin (Open)

T4

Test Input Pin (short to Ground)

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2011.07 - Rev.B

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BD60910GU

Technical Note

●Equivalent Circuit

A

B

VBAT

C

VBAT

E

M

X

H

VBAT

VIO

I

VBAT

VIO

L

VBAT

N

VBAT

Q ^VBAT

VBAT

S

VBAT

VoS

VBAT

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2011.07 - Rev.B

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BD60910GU

Technical Note

●I²C BUS format

The writing/reading operation is based on the I²C slave standard.

・ Slave address

A7

1

A6

1

A5

1

A4

0

A3

1

A2

1

A1

0

R/W

1/0

・ Bit Transfer

SCL transfers 1-bit data during H. SCL cannot change signal of SDA during H at the time of bit transfer. If SDA changes

while SCL is H, START conditions or STOP conditions will occur and it will be interpreted as a control signal.

SDA

SCL

SDA a state of stability

Data are effective

SDA

It can change

：

・ START and STOP condition

When SDA and SCL are H, data is not transferred on the I²C- bus. This condition indicates, if SDA changes from H to L

while SCL has been H, it will become START (S) conditions, and an access start, if SDA changes from L to H while SCL

has been H, it will become STOP (P) conditions and an access end.

SDA

SCL

S

P

STOP condition

START condition

・ Acknowledge

It transfers data 8 bits each after the occurrence of START condition. A transmitter opens SDA after transfer 8bits data, and

a receiver returns the acknowledge signal by setting SDA to L.

DATA OUTPUT

BY TRANSMITTER

not acknowledge

DATA OUTPUT

BY RECEIVER

acknowledge

1

2

8

9

SCL

S

clock pulse for

acknowledgement

START condition

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2011.07 - Rev.B

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BD60910GU

Technical Note

・Writing protocol

A register address is transferred by the next 1 byte that transferred the slave address and the write-in command. The 3rd

byte writes data in the internal register written in by the 2nd byte, and after 4th byte or, the increment of register address

is carried out automatically. However, when a register address turns into the last address, it is set to 00h by the next

transmission. After the transmission end, the increment of the address is carried out.

*1

0

A A7 A6 A5 A4 A3 A2 A1 A0 A D7D6D5D4D3D2D1D0 A

register address

DATA

D7D6D5 D4D3D2D1D0 A

DATA

P

S

X

slave address

register address

increment

register address

increment

R/W=0(write)

A=acknowledge(SDA LOW)

A=not acknowledge(SDA HIGH)

S=START condition

from master to slave

from slave to master

P=STOP condition

*1: Write Timing

・Reading protocol

It reads from the next byte after writing a slave address and R/W bit. The register to read considers as the following

address accessed at the end, and the data of the address that carried out the increment is read after it. If an address

turns into the last address, the next byte will read out 00h. After the transmission end, the increment of the address is

carried out.

S

1

A D7 D6 D5 D4 D3 D2 D1 D0 A

DATA

D7 D6 D5 D4 D3 D2 D1 D0 A

DATA

P

X

X X X X X X

slave address

register address

increment

register address

increment

R/W=1(read)

A=acknowledge(SDA LOW)

A=not acknowledge(SDA HIGH)

S=START condition

from master to slave

from slave to master

P=STOP condition

・Multiple reading protocols

After specifying an internal address, it reads by repeated START condition and changing the data transfer direction. The

data of the address that carried out the increment is read after it. If an address turns into the last address, the next byte

will read out 00h. After the transmission end, the increment of the address is carried out.

S

A

A Sr

1 A

X X X X X X X

slave address

0

A7A6A5A4A3A2A1A0

register address

X X X X X X X

slave address

R/W=0(write)

R/W=1(read)

A

P

D7D6D5D4D3D2D1D0 A

DATA

D7D6D5D4D3D2D1D0

DATA

register address

increment

register address

increment

A=acknowledge(SDA LOW)

A=not acknowledge(SDA HIGH)

S=START condition

P=STOP condition

Sr=repeated START condition

from master to slave

from slave to master

As for reading protocol and multiple reading protocols, please do A (not acknowledge) after doing the final reading

operation. It stops with read when ending by A(acknowledge), and SDA stops in the state of Low when the reading data

of that time is 0. However, this state returns usually when SCL is moved, data is read, and A (not acknowledge) is done.

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2011.07 - Rev.B

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BD60910GU

Technical Note

●Timing diagram

SDA

t BUF

t SU;DAT

t HD;STA

t LOW

SCL

t SU;STO

t SU;STA

t HD;STA

t HD;DAT

S

Sr

P

S

t HIGH

●Electrical Characteristics(Unless otherwise specified, Ta=25 ℃, VBAT=3.6V, VIO=1.8V)

Standard-mode

Fast-mode

Typ.

Parameter

【I²C BUS format】

Symbol

Unit

Min.

Typ.

Max.

Min.

Max.

SCL clock frequency

fSCL

tLOW

tHIGH

0

-

100

0

-

400

kHz

μs

LOW period of the SCL clock

HIGH period of the SCL clock

4.7

4.0

-

1.3

0.6

-

μs

Hold time (repeated) START condition

After this period, the first clock is generated

Set-up time for a repeated START

condition

tHD;STA

tSU;STA

μs

4.7

-

0.6

-

μs

Data hold time

tHD;DAT

tSU;DAT

tSU;STO

0

-

3.45

0

-

0.9

μs

ns

μs

Data set-up time

250

4.0

-

100

0.6

-

Set-up time for STOP condition

Bus free time between a STOP

and START condition

tBUF

4.7

-

1.3

-

μs

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BD60910GU

Technical Note

●Register List

Input "0” for "-".

Register data

D4

Address

W/R

Function

D7

D6

-

D5

-

D3

-

D2

-

D1

-

D0

SFTRST

LEDEN

-

00h

01h

02h

03h

04h

05h

06h

07h

08h

09h

0Ah

0Bh

0Ch

0Dh

0Eh

0Fh

10h

11h

12h

13h

14h

15h

16h

17h

18h

19h

1Ah

1Bh

1Ch

1Dh

W

R/W

-

VOVP(0)

-

Software Reset

-

VOVP(2)

-

VOVP(1)

-

WPWMEN

-

ALCEN

-

LEDMD

-

LED, ALC, OVP Control

-

LED Current Setting

at non-ALC mode

R/W

-

ILED(6)

-

ILED(5)

-

ILED(4)

-

ILED(3)

-

ILED(2)

-

ILED(1)

-

ILED(0)

-

W

-

THL(3)

THL(2)

-

THL(1)

-

THL(0)

-

TLH(3)

-

TLH(2)

-

TLH(1)

-

TLH(0)

-

LED Current transition

-

R/W

-

ADCYC(1)

ADCYC(0)

-

GAIN(1)

-

GAIN(0)

-

STYPE

-

VSB

-

MDCIR

-

SBIASON

-

ALC mode setting

-

R

-

AMB(3)

IU0(3)

IU1(3)

IU2(3)

IU3(3)

IU4(3)

IU5(3)

IU6(3)

IU7(3)

IU8(3)

IU9(3)

IUA(3)

IUB(3)

IUC(3)

IUD(3)

IUE(3)

IUF(3)

AMB(2)

IU0(2)

IU1(2)

IU2(2)

IU3(2)

IU4(2)

IU5(2)

IU6(2)

IU7(2)

IU8(2)

IU9(2)

IUA(2)

IUB(2)

IUC(2)

IUD(2)

IUE(2)

IUF(2)

AMB(1)

IU0(1)

IU1(1)

IU2(1)

IU3(1)

IU4(1)

IU5(1)

IU6(1)

IU7(1)

IU8(1)

IU9(1)

IUA(1)

IUB(1)

IUC(1)

IUD(1)

IUE(1)

IUF(1)

AMB(0)

IU0(0)

IU1(0)

IU2(0)

IU3(0)

IU4(0)

IU5(0)

IU6(0)

IU7(0)

IU8(0)

IU9(0)

IUA(0)

IUB(0)

IUC(0)

IUD(0)

IUE(0)

IUF(0)

Ambient level output

LED Current at Ambient level 0h

LED Current at Ambient level 1h

LED Current at Ambient level 2h

LED Current at Ambient level 3h

LED Current at Ambient level 4h

LED Current at Ambient level 5h

LED Current at Ambient level 6h

LED Current at Ambient level 7h

LED Current at Ambient level 8h

LED Current at Ambient level 9h

LED Current at Ambient level Ah

LED Current at Ambient level Bh

LED Current at Ambient level Ch

LED Current at Ambient level Dh

LED Current at Ambient level Eh

LED Current at Ambient level Fh

W

IU0(6)

IU1(6)

IU2(6)

IU3(6)

IU4(6)

IU5(6)

IU6(6)

IU7(6)

IU8(6)

IU9(6)

IUA(6)

IUB(6)

IUC(6)

IUD(6)

IUE(6)

IUF(6)

IU0(5)

IU1(5)

IU2(5)

IU3(5)

IU4(5)

IU5(5)

IU6(5)

IU7(5)

IU8(5)

IU9(5)

IUA(5)

IUB(5)

IUC(5)

IUD(5)

IUE(5)

IUF(5)

IU0(4)

IU1(4)

IU2(4)

IU3(4)

IU4(4)

IU5(4)

IU6(4)

IU7(4)

IU8(4)

IU9(4)

IUA(4)

IUB(4)

IUC(4)

IUD(4)

IUE(4)

IUF(4)

Prohibit to accessing the address that isn’t mentioned.

The timing indicated by explanation of registers, is a value in case built-in OSC has Typ. frequency.(1MHz)

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2011.07 - Rev.B

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BD60910GU

Technical Note

●Register Map

Address 00h < Software Reset >

Address

00h

R/W

W

Bit7

-

Bit6

-

Bit5

-

Bit4

-

Bit3

-

Bit2

-

Bit1

-

Bit0

SFTRST

Initial

Value

00h

-

0

Bit [7:1] : (Not used)

Bit0 : SFTRST Software Reset Command

“0” :

“1” :

Reset cancel

Reset (All register initializing)

Refer to “Explanation 1” for detail.

Address 01h < LED, ALC Control >

Address

01h

R/W

Bit7

-

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

VOVP(2)

VOVP(1)

VOVP(0) WPWMEN

ALCEN

LEDMD

LEDEN

Initial

Value

00h

-

0

Bit7 :

(Not used)

Bit [6:4] : VOVP(2:0) Over Voltage Protection detect voltage

“000” : OVP=31V(typ)

“001” : OVP=27V(typ)

“010” : OVP=24V(typ)

“011” : OVP=21V(typ)

“100” : OVP=18V(typ)

“101” : Don’t use

8LED connection

7LED connection

6LED connection

5LED connection

4LED connection

“110” : Don’t use

“111” : Don’t use

Refer to “Explanation 4” for detail.

WPWMEN External PWM Input “WPWMIN” terminal Enable Control (Valid/Invalid)

Bit3 :

Bit2 :

Bit1 :

Bit0 :

“0” :

“1” :

WPWMIN input invalid

WPWMIN input valid

Refer to “Explanation 5-(10)” for detail.

ALCEN

“0” :

ALC Function Control (ON/OFF)

ALC function OFF

“1” :

ALC function ON

Refer to “Explanation 5-(1)” for detail.

LEDMD

“0” :

“1” :

LED Mode Select (ALC mode/Register mode)

Register mode

ALC mode

Refer to “Explanation 5-(1)” for detail.

LEDEN

“0” :

LED Control (ON/OFF)

LED OFF

“1” :

LED ON

Refer to “Explanation 5-(1)” for detail.

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2011.07 - Rev.B

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BD60910GU

Technical Note

Address 03h < LED Current Setting at Register mode >

Address

03h

R/W

Bit7

-

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

ILED(6)

ILED(5)

ILED(4)

ILED(3)

ILED(2)

ILED(1)

ILED(0)

Initial

Value

00h

-

0

Bit7 :

(Not used)

Bit [6:0] : ILED(6:0) LED Current Setting at Register mode

“0000000” :

“0000001” :

“0000010” :

“0000011” :

“0000100” :

“0000101” :

“0000110” :

“0000111” :

“0001000” :

“0001001” :

“0001010” :

“0001011” :

“0001100” :

“0001101” :

“0001110” :

“0001111” :

“0010000” :

“0010001” :

“0010010” :

“0010011” :

“0010100” :

“0010101” :

“0010110” :

“0010111” :

“0011000” :

“0011001” :

“0011010” :

“0011011” :

“0011100” :

“0011101” :

“0011110” :

“0011111” :

“0100000” :

“0100001” :

“0100010” :

“0100011” :

“0100100” :

“0100101” :

“0100110” :

“0100111” :

“0101000” :

“0101001” :

“0101010” :

“0101011” :

“0101100” :

“0101101” :

“0101110” :

“0101111” :

“0110000” :

“0110001” :

“0110010” :

“0110011” :

“0110100” :

“0110101” :

“0110110” :

“0110111” :

“0111000” :

“0111001” :

“0111010” :

“0111011” :

“0111100” :

“0111101” :

“0111110” :

“0111111” :

0.2 mA

0.4 mA

0.6 mA

0.8 mA

1.0 mA

1.2 mA

1.4 mA

1.6 mA

1.8 mA

2.0 mA

2.2 mA

2.4 mA

2.6 mA

2.8 mA

3.0 mA

3.2 mA

3.4 mA

3.6 mA

3.8 mA

4.0 mA

4.2 mA

4.4 mA

4.6 mA

4.8 mA

5.0 mA

5.2 mA

5.4 mA

5.6 mA

5.8 mA

6.0 mA

6.2 mA

6.4 mA

6.6 mA

6.8 mA

7.0 mA

7.2 mA

7.4 mA

7.6 mA

7.8 mA

8.0 mA

8.2 mA

8.4 mA

8.6 mA

8.8 mA

9.0 mA

9.2 mA

9.4 mA

9.6 mA

9.8 mA

10.0 mA

10.2 mA

10.4 mA

10.6 mA

10.8 mA

11.0 mA

11.2 mA

11.4 mA

11.6 mA

11.8 mA

12.0 mA

12.2 mA

12.4 mA

12.6 mA

12.8 mA

“1000000” : 13.0 mA

“1000001” : 13.2 mA

“1000010” : 13.4 mA

“1000011” : 13.6 mA

“1000100” : 13.8 mA

“1000101” : 14.0 mA

“1000110” : 14.2 mA

“1000111” : 14.4 mA

“1001000” : 14.6 mA

“1001001” : 14.8 mA

“1001010” : 15.0 mA

“1001011” : 15.2 mA

“1001100” : 15.4 mA

“1001101” : 15.6 mA

“1001110” : 15.8 mA

“1001111” : 16.0 mA

“1010000” : 16.2 mA

“1010001” : 16.4 mA

“1010010” : 16.6 mA

“1010011” : 16.8 mA

“1010100” : 17.0 mA

“1010101” : 17.2 mA

“1010110” : 17.4 mA

“1010111” : 17.6 mA

“1011000” : 17.8 mA

“1011001” : 18.0 mA

“1011010” : 18.2 mA

“1011011” : 18.4 mA

“1011100” : 18.6 mA

“1011101” : 18.8 mA

“1011110” : 19.0 mA

“1011111” :

19.2 mA

“1100000” : 19.4 mA

“1100001” : 19.6 mA

“1100010” : 19.8 mA

“1100011” : 20.0 mA

“1100100” : 20.2 mA

“1100101” : 20.4 mA

“1100110” : 20.6 mA

“1100111” : 20.8 mA

“1101000” : 21.0 mA

“1101001” : 21.2 mA

“1101010” : 21.4 mA

“1101011” : 21.6 mA

“1101100” : 21.8 mA

“1101101” : 22.0 mA

“1101110” : 22.2 mA

“1101111” :

22.4 mA

“1110000” : 22.6 mA

“1110001” : 22.8 mA

“1110010” : 23.0 mA

“1110011” : 23.2 mA

“1110100” : 23.4 mA

“1110101” : 23.6 mA

“1110110” : 23.8 mA

“1110111” :

24.0 mA

“1111000” : 24.2 mA

“1111001” : 24.4 mA

“1111010” : 24.6 mA

“1111011” :

“1111100” :

“1111101” :

“1111110” :

“1111111” :

24.8 mA

25.0 mA

25.2 mA

25.4 mA

25.6 mA

www.rohm.com

2011.07 - Rev.B

12/30

BD60910GU

Technical Note

Address 08h < LED Current transition >

Address

08h

R/W

W

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

THL(3)

THL(2)

THL(1)

THL(0)

TLH(3)

TLH(2)

TLH(1)

TLH(0)

Initial

Value

C7h

1

0

1

Bit [7:4] : THL(3:0)

“0000” :

“0001” :

“0010” :

“0011” :

LED current Down transition per 0.2mA step

0.256 ms

0.512 ms

1.024 ms

2.048 ms

4.096 ms

8.192 ms

16.38 ms

32.77 ms

65.54 ms

131.1 ms

196.6 ms

262.1 ms

“0100” :

“0101” :

“0110” :

“0111” :

“1000” :

“1001” :

“1010” :

“1011” :

“1100” :

“1101” :

“1110” :

327.7 ms

393.2 ms

458.8 ms

524.3 ms

(Initial value)

“1111” :

Refer to “Explanation 5-(8)” for detail.

Bit [3:0] : TLH(3:0)

“0000” :

LED current Up transition per 0.2mA step

0.256 ms

“0001” :

“0010” :

“0011” :

“0100” :

“0101” :

“0110” :

“0111” :

“1000” :

“1001” :

“1010” :

“1011” :

“1100” :

“1101” :

“1110” :

“1111” :

0.512 ms

1.024 ms

2.048 ms

4.096 ms

8.192 ms

16.38 ms

32.77 ms

65.54 ms

131.1 ms

196.6 ms

262.1 ms

327.7 ms

393.2 ms

458.8 ms

524.3 ms

(Initial value)

Refer to “Explanation 5-(8)” for detail.

www.rohm.com

2011.07 - Rev.B

13/30

BD60910GU

Technical Note

Address 0Bh < ALC mode setting >

Address

0Bh

R/W

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

ADCYC(1) ADCYC(0) GAIN(1)

GAIN(0)

STYPE

VSB

MDCIR

SBIASON

Initial

Value

81h

1

0

1

Bit [7:6] : ADCYC(1:0)

ADC Measurement Cycle

0.52 s

1.05 s

“00” :

“01” :

“10” :

“11” :

1.57 s (Initial value)

2.10 s

Refer to “Explanation 5-(4)” for detail.

Bit [5:4] : GAIN(1:0) Sensor Gain Switching Function Control

“00” :

“01” :

“10” :

“11” :

Auto Change (Initial value)

Manual High

Manual Low

Fixed

Refer to “Explanation 5-(3),5-(6)” for detail.

Bit3 :

Bit2 :

Bit1 :

Bit0 :

STYPE

“0” :

“1” :

Ambient Light Sensor Type Select (Linear/Logarithm)

For Linear Sensor

For Log Sensor

(Initial value)

Refer to “Explanation 5-(6)” for detail.

VSB

“0” :

“1” :

SBIAS Output Voltage Control

SBIAS output voltage 3.0V

SBIAS output voltage 2.6V

(Initial value)

Refer to “Explanation 5-(2)” for detail.

MDCIR

“0” :

“1” :

LED Current Reset Select by Mode Change

LED current non-reset at mode change (Initial value)

LED current reset at mode change

Refer to “Explanation 5-(9)” for detail.

SBIASON

“0” :

“1” :

SBIAS Control (ON/OFF)

Measurement cycle synchronous

Usually ON (at ALCEN=1) (Initial value)

Refer to “Explanation 5-(4)” for detail.

www.rohm.com

2011.07 - Rev.B

14/30

BD60910GU

Technical Note

Address 0Dh < Ambient level (Read Only) >

Address

0Dh

R/W

R

Bit7

-

Bit6

-

Bit5

-

Bit4

-

Bit3

Bit2

Bit1

Bit0

AMB(3)

AMB(2)

AMB(1)

AMB(0)

Initial

Value

-

Bit [7:4] : (Not used)

Bit [3:0] : AMB(3:0)

“0000” :

“0001” :

“0010” :

“0011” :

Ambient Level

0h

1h

2h

3h

4h

5h

6h

7h

8h

9h

Ah

Bh

Ch

Dh

Eh

Fh

“0100” :

“0101” :

“0110” :

“0111” :

“1000” :

“1001” :

“1010” :

“1011” :

“1100” :

“1101” :

“1110” :

“1111” :

The data can be read through I²C.

Refer to “Explanation 5-(6)” for detail.

www.rohm.com

2011.07 - Rev.B

15/30

BD60910GU

Technical Note

Address 0Eh~1Dh < LED Current at Ambient level 0h~Fh >

Address

R/W

W

Bit7

-

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0Eh~1Dh

IU*(6)

IU*(5)

IU*(4)

IU*(3)

IU*(2)

IU*(1)

IU*(0)

Initial

Value

-

Refer to “Explanation 5-(7)” for initial table

“*” means 0~F.

Bit7 :

(Not used)

Bit [6:0] : IU*(6:0)

LED Current at Ambient Level for 0h~Fh

“0000000” :

“0000001” :

“0000010” :

“0000011” :

“0000100” :

“0000101” :

“0000110” :

“0000111” :

“0001000” :

“0001001” :

“0001010” :

“0001011” :

“0001100” :

“0001101” :

“0001110” :

“0001111” :

“0010000” :

“0010001” :

“0010010” :

“0010011” :

“0010100” :

“0010101” :

“0010110” :

“0010111” :

“0011000” :

“0011001” :

“0011010” :

“0011011” :

“0011100” :

“0011101” :

“0011110” :

“0011111” :

“0100000” :

“0100001” :

“0100010” :

“0100011” :

“0100100” :

“0100101” :

“0100110” :

“0100111” :

“0101000” :

“0101001” :

“0101010” :

“0101011” :

“0101100” :

“0101101” :

“0101110” :

“0101111” :

“0110000” :

“0110001” :

“0110010” :

“0110011” :

“0110100” :

“0110101” :

“0110110” :

“0110111” :

“0111000” :

“0111001” :

“0111010” :

“0111011” :

“0111100” :

“0111101” :

“0111110” :

“0111111” :

0.2 mA

0.4 mA

0.6 mA

0.8 mA

1.0 mA

1.2 mA

1.4 mA

1.6 mA

1.8 mA

2.0 mA

2.2 mA

2.4 mA

2.6 mA

2.8 mA

3.0 mA

3.2 mA

3.4 mA

3.6 mA

3.8 mA

4.0 mA

4.2 mA

4.4 mA

4.6 mA

4.8 mA

5.0 mA

5.2 mA

5.4 mA

5.6 mA

5.8 mA

6.0 mA

6.2 mA

6.4 mA

6.6 mA

6.8 mA

7.0 mA

7.2 mA

7.4 mA

7.6 mA

7.8 mA

8.0 mA

8.2 mA

8.4 mA

8.6 mA

8.8 mA

9.0 mA

9.2 mA

9.4 mA

9.6 mA

9.8 mA

10.0 mA

10.2 mA

10.4 mA

10.6 mA

10.8 mA

11.0 mA

11.2 mA

11.4 mA

11.6 mA

11.8 mA

12.0 mA

12.2 mA

12.4 mA

12.6 mA

12.8 mA

“1000000” : 13.0 mA

“1000001” : 13.2 mA

“1000010” : 13.4 mA

“1000011” : 13.6 mA

“1000100” : 13.8 mA

“1000101” : 14.0 mA

“1000110” : 14.2 mA

“1000111” : 14.4 mA

“1001000” : 14.6 mA

“1001001” : 14.8 mA

“1001010” : 15.0 mA

“1001011” : 15.2 mA

“1001100” : 15.4 mA

“1001101” : 15.6 mA

“1001110” : 15.8 mA

“1001111” : 16.0 mA

“1010000” : 16.2 mA

“1010001” : 16.4 mA

“1010010” : 16.6 mA

“1010011” : 16.8 mA

“1010100” : 17.0 mA

“1010101” : 17.2 mA

“1010110” : 17.4 mA

“1010111” : 17.6 mA

“1011000” : 17.8 mA

“1011001” : 18.0 mA

“1011010” : 18.2 mA

“1011011” : 18.4 mA

“1011100” : 18.6 mA

“1011101” : 18.8 mA

“1011110” : 19.0 mA

“1011111” :

19.2 mA

“1100000” : 19.4 mA

“1100001” : 19.6 mA

“1100010” : 19.8 mA

“1100011” : 20.0 mA

“1100100” : 20.2 mA

“1100101” : 20.4 mA

“1100110” : 20.6 mA

“1100111” : 20.8 mA

“1101000” : 21.0 mA

“1101001” : 21.2 mA

“1101010” : 21.4 mA

“1101011” : 21.6 mA

“1101100” : 21.8 mA

“1101101” : 22.0 mA

“1101110” : 22.2 mA

“1101111” :

22.4 mA

“1110000” : 22.6 mA

“1110001” : 22.8 mA

“1110010” : 23.0 mA

“1110011” : 23.2 mA

“1110100” : 23.4 mA

“1110101” : 23.6 mA

“1110110” : 23.8 mA

“1110111” :

24.0 mA

“1111000” : 24.2 mA

“1111001” : 24.4 mA

“1111010” : 24.6 mA

“1111011” :

“1111100” :

“1111101” :

“1111110” :

“1111111” :

24.8 mA

25.0 mA

25.2 mA

25.4 mA

25.6 mA

www.rohm.com

2011.07 - Rev.B

16/30

BD60910GU

Technical Note

●Contents of “Explanation for operate”

1. Reset

(1) Software reset

(2) Hardware reset

(3) Reset sequence

2. Thermal shutdown

3. DC/DC for LED Driver

4. Protection function

(1) Over voltage protection

(2) Over current protection

(3) VOUT short to GND protection

(4) VOUT open protection

5. ALC (Auto Luminous Control) and LED Driver

(1) ALC ON/OFF

(2) I/V conversion

(3) Sensor Gain control

(4) A/D conversion

(5) Average filter

(6) Ambient level detection

(7) LED current assignment

(8) Slope process

(9) LED current reset at mode change

(10) Current adjustment (External PWM)

6. I/O

7. The unused terminal

www.rohm.com

2011.07 - Rev.B

17/30

BD60910GU

Technical Note

●Explanation for operate

1. Reset

There are two kinds of reset, software reset and hardware reset.

(1) Software reset

・All the registers are initialized more than making a register (SFTRST) setup "1".

・The register of software resetting is an automatic return (Auto Return 0).

(2) Hardware reset

・RESETB pin “H” → “L” to shift hardware reset.

・Under hardware reset, all registers and output pins are initialized, and I²C access are stopped.

・RESETB pin “L” → “H” to release from hardware reset

・RESETB pin has delay circuit. It doesn’t recognize as hardware reset in “L” period under 5μs.

(3) Reset Sequence

・When hardware reset was done during software reset, software reset is canceled when

hardware reset is canceled. (Because the initial value of software reset is “0”)

2. Thermal shutdown

Thermal shutdown function is effective in the following blocks.

DC/DC

LED Driver

A thermal shutdown function works in about 190℃.

Detection temperature has a hysteresis, and detection release temperature is about 170℃.

(Design reference value)

3. DC/DC for LED driver

DC/DC block is designed for the power supply for LED driver.

Start

DC/DC circuit operates when LEDEN turns ON.

Soft start

Soft start function built-in to prevent rush current at start of the DC/DC.

VBAT

T_VBATON

T_VBATOFF

VIO

T_VIOON=min0.1_ms

T_VIOOFF=min１_ms

RESETB

LEDEN

VOUT

T_RSTB=min0.1_ms

T_RST=min0_ms

Soft start

LED

Current

www.rohm.com

2011.07 - Rev.B

18/30

BD60910GU

Technical Note

4. Protection function

(1) Over voltage protection

Over Voltage Protection prevents the over-voltage of the VOUT terminal. If the VOUT voltage is over detect

voltage, it stopping DC/DC switching. After stopping the switching, if VOUT is drop under un-detect voltage, the

switching is re-start.

The OVP voltage can be changed by the register.

It is possible that an OVP voltage is set up suitably in accordance with the Vf and the number of LED that you

use. Set it up toward an approximate goal of the following formula.

OVP voltage ≧ (LED number) x (LED Vf max) +1 [V]

(2) Over current protection

Switching Overcurrent detection is done by the resistance arranged under the switching Tr. If it detect over

current level, it is stopping DC/DC switching. Switching begins again when a state of over-current is canceled.

(3) VOUT short to GND protection

The detection of a state of ground short of the VOUT terminal.

DC/DC switching does stop at the time of the detection. Switching begins again when a state of detection is

canceled.

(4) VOUT open protection

The detection of a state of Open of the VOUT terminal.

DC/DC switching does stop at the time of the detection. Switching begins again when a state of detection is

canceled.

www.rohm.com

2011.07 - Rev.B

19/30

BD60910GU

Technical Note

5. The explanation of ALC (Auto Luminous Control)

LCD backlight current adjustment is possible in the basis of ambient brightness by external sensor.

• Extensive selection of the ambient light sensors (Photo Diode, Photo Transistor, Photo IC(linear)) is

possible by built-in adjustment feature of Sensor bias, ADC with average filter and logarithm conversion.

• Ambient brightness is changed into ambient level by digital data processing, and it can be read through I²C I/F.

• Register setting can customize a conversion to LED current. (Initial value is pre-set.)

• Natural dimming of LED driver is possible with the adjustment of the current transition speed.

Usually ON / intermittent

PWM enabling

Output Voltage

WPWMIN

SBIAS

ADC

SBIAS

Conversion

Table

Slope Timer

Mode Select

LCD

BackLight

LED*

LIN/LOG

Average

Sensor

Slope

Data

Current

SSENS

Logarithmic Conv.

Ambient Level detect

process

Correction

Conversion

Main Group

LED Driver

GC1

GC2

Gain

Control

Main current setting

Sensor Gain Control

Ambient Level

ALC

LED control

* Wave form in this explanation just shows operation image, not shows absolute value precisely.

(1) Auto Luminous Control ON/OFF

・

ALC block can be independent setting ON/OFF.

It can use only to measure the Ambient level.

Register : ALCEN

Register : LEDEN

Register : LEDMD

・

Refer to under about the associate ALC mode and LED current.

ALCEN

LEDEN

LEDMD

ALC

LED control

OFF

Mode

OFF

LED current

0

1

0

1

0

1

＊

0

OFF

ILED(6:0)

IU0(6:0) (*1)

OFF

Resister

mode

( AMB(3:0)=0h )

ON

OFF

ON

1

＊

0

ON

ALC mode

ILED(6:0)

ALC mode (*2)

1

(*1) LED current is selected IU0(6:0), because of ALC is OFF, AMB(3:0)=0h.

(*2) LED current is selected IU0(6:0)~IUF(6:0) corresponding to each ambient level.

www.rohm.com

2011.07 - Rev.B

20/30

BD60910GU

Technical Note

(2) I/V conversion

・

The bias voltage and external resistance for the I-V conversion (Rs)

are adjusted with adaptation of sensor characteristic

The bias voltage is selectable by register setup.

Register : VSB

・

“0” : SBIAS output voltage 3.0V

“1” : SBIAS output voltage 2.6V

Ambient

SBIAS

SSENS voltage

VCC

VSSENS

Rs is large

Iout

Sensor IC

A/D

IOUT

SSENS

SGND

GND

Rs

Rs is small

Rs : Sense resistance (A sensor output current is changed into the voltage value.)

SBIAS : Bias power supply terminal for the sensor (3.0V / 2.6V by register setting)

SSENS : Sense voltage input terminal

Ambient

SSENS Voltage = Iout x Rs

www.rohm.com

2011.07 - Rev.B

21/30

BD60910GU

Technical Note

(3) Sensor Gain control

・

Sensor gain switching function is built in to extend the dynamic range.

It is controlled by register setup.

When automatic gain control is off, the gain status can be set up

in the manual.

High Gain mode

Register : GAIN(1:0)

・

GC1 and GC2 are outputted corresponding to each gain status.

Low Gain mode

Ambient

Auto Gain mode

Ambient

Example 1 (Use BH1600FVC)

Example 2

Example 3

SBIAS

SSENS

VCC

SSENS

IOUT

SSENS

Application

example

BH1600

GC1

GC2

GND

SGND

Resister values are relative

Manual

Operating mode

Auto

00

Auto

Fixed

High

01

Low

10

High

01

Low

10

GAIN(1:0) setting

Gain status

00

11

-

High Low High

L

Low High Low High

Low

L

GC1 output

L

GC2 output

L

: This means that it becomes High with A/D measurement cycle synchronously.

(*1) : Set up the relative ratio of the resistance in the difference in the brightness change of the High Gain mode and the Low Gain mode carefully.

www.rohm.com

2011.07 - Rev.B

22/30

BD60910GU

Technical Note

(4) A/D conversion

・

The detection of ambient data is done periodically for the low power.

SBIAS and ADC are turned off except for the ambient measurement.

The sensor current may be shut in this function, it can possible to decrease the current consumption.

SBIAS pin and SSENS pin are pull-down in internal when there are OFF.

SBIAS circuit has the two modes. (Usually ON mode or intermittent mode)

Register : ADCYC(1:0)

Register : SBIASON

16 times

ALCEN

ADCYC(1:0)

ADC Cycle

SBIAS Output

(Wait time)

Twait= 64ms(typ)

When SBIASON=1

ADC Movement

GC1, GC2

TAD= 16.4ms(typ)

(A/D conversion time)

AD start signal

GC1, GC2=00

TADone= 1.024ms(typ)

16 times measurement

AMB(3:0)

Toprt= 80.4ms(typ)

(Operate time)

www.rohm.com

2011.07 - Rev.B

23/30

BD60910GU

Technical Note

(5) Average filter

・

Average filter is built in to rid noise or flicker.

16 times averaging.

(6) Ambient level detection

・

Averaged A/D value is converted to Ambient level corresponding to Gain control and sensor type.

・ Ambient level is judged to rank of 16 steps by ambient data.

・ The type of ambient light sensor can be chosen by register.

(Linear type sensor / Logarithm type sensor)

Register : STYPE

“0” : For Linear sensor

“1” : For Log sensor

・

Ambient level is output through I²C.

Register : AMB(3:0)

STYPE

0

10

1

GAIN(1:0)

00

01

11

XX

Gain

Status

Auto Low

Auto High

Manual Low

Manual High

Fixed

Ambient

level

SSENS voltage

VoS×0／256

0h

1h

2h

3h

4h

5h

6h

7h

8h

9h

Ah

Bh

Ch

Dh

Eh

Fh

VoS×0／256

VoS×1／256

VoS×2／256

VoS×0／256

VoS×1／256

VoS×2／256

VoS×0／256

VoS×1／256

VoS×2／256

VoS×17／256

VoS×18／256

VoS×26／256

VoS×27／256

VoS×36／256

VoS×37／256

VoS×47／256

VoS×48／256

VoS×59／256

VoS×60／256

VoS×71／256

VoS×72／256

VoS×83／256

VoS×84／256

VoS×95／256

VoS×96／256

VoS×107／256

VoS×108／256

VoS×119／256

VoS×120／256

VoS×131／256

VoS×132／256

VoS×143／256

VoS×144／256

VoS×155／256

VoS×156／256

VoS×168／256

VoS×169／256

VoS×181／256

VoS×182／256

VoS×255／256

This area is

not assigned.

This area is

not assigned.

VoS×3／256

VoS×4／256

VoS×5／256

VoS×7／256

VoS×8／256

VoS×12／256

VoS×13／256

VoS×21／256

VoS×22／256

VoS×37／256

VoS×38／256

VoS×65／256

VoS×66／256

VoS×113／256

VoS×114／256

VoS×199／256

VoS×200／256

VoS×255／256

VoS×3／256

VoS×4／256

VoS×5／256

VoS×7／256

VoS×8／256

VoS×12／256

VoS×13／256

VoS×21／256

VoS×22／256

VoS×37／256

VoS×38／256

VoS×65／256

VoS×66／256

VoS×113／256

VoS×114／256

VoS×199／256

VoS×200／256

VoS×255／256

VoS×3／256

VoS×4／256

VoS×5／256

VoS×6／256

VoS×7／256

VoS×9／256

VoS×10／256

VoS×13／256

VoS×14／256

VoS×19／256

VoS×20／256

VoS×27／256

VoS×28／256

VoS×38／256

VoS×39／256

VoS×53／256

VoS×54／256

VoS×74／256

VoS×75／256

VoS×104／256

VoS×105／256

VoS×144／256

VoS×145／256

VoS×199／256

VoS×200／256

VoS×255／256

VoS×0／256

VoS×1／256

VoS×0／256

VoS×1／256

VoS×2／256

VoS×3／256

VoS×4／256

VoS×6／256

VoS×7／256

VoS×11／256

VoS×12／256

VoS×20／256

VoS×21／256

VoS×36／256

VoS×37／256

VoS×64／256

VoS×65／256

VoS×114／256

VoS×115／256

VoS×199／256

VoS×200／256

VoS×255／256

VoS×2／256

VoS×3／256

VoS×4／256

VoS×6／256

VoS×7／256

VoS×11／256

VoS×12／256

VoS×20／256

VoS×21／256

VoS×36／256

VoS×37／256

VoS×64／256

VoS×65／256

VoS×114／256

VoS×115／256

VoS×199／256

VoS×200／256

VoS×255／256

This area is

not assigned.

This area is

not assigned.



In the Auto Gain control mode, sensor gain changes in gray-colored ambient level.

www.rohm.com

2011.07 - Rev.B

24/30

BD60910GU

Technical Note

(7) LED current assignment

・

LED current can be assigned as each of 16 steps of the ambient level.

Register setting can customize a conversion to LED current. (Initial

value is pre-set.)

Register : IU*(6:0)

Conversion table

can be changed

Ambient Level

Conversion Table (initial value)

Ambient

Level

Ambient

Level

Setting data

Current value

Setting data

Current value

0h

1h

2h

3h

4h

5h

6h

7h

11h

13h

15h

18h

1Eh

25h

2Fh

3Bh

3.6mA

4.0mA

4.4mA

5.0mA

6.2mA

7.6mA

9.6mA

12.0mA

8h

9h

Ah

Bh

Ch

Dh

Eh

Fh

48h

56h

5Fh

63h

14.6mA

17.4mA

19.2mA

20.0mA

(8) Slope process

・

Slope process is given to LED current to dim naturally.

LED current changes in the 256Step gradation in sloping.

LED setting data

LED Current

Up(dark→bright),Down(bright→dark) LED current transition speed

are set individually.

Register : THL(3:0)

Register : TLH(3:0)

THL

(3:0)

・

LED current changes as follows at the time as the slope.

TLH (THL) is setup of time of the current step 2/256.

TLH(3:0)

Up/Down

transition

spe

ed is set

individually

TLH

time

Zoom

25.6mA

256

THL

=0.1mA

TLH(3:0)

time

www.rohm.com

2011.07 - Rev.B

25/30

BD60910GU

Technical Note

(9) LED current reset when mode change

・

Selectable the way to sloping at mode change.

(ALC↔Resister)

Resister

mode

Resister

mode

ALC

mode

Register : MDCIR

ILED(6:0)

“0” : LED current non-reset at mode change

“1” : LED current reset at mode change

IU*(6:0)

MDCIR= “0”

0mA

time

Resister

mode

ALC

mode

Resister

mode

ILED(6:0)

IU*(6:0)

MDCIR= “1”

0mA

time

(10) Current adjustment (External PWM)

・

PWM drive by the external terminal (WPWMIN) is possible with permission by the register setting.

Register : WPWMEN

・

It is suitable for the intensity correction by external control,

because PWM based on LED current of register setup or ALC control.

WPWMIN

WPWMEN

LED current

PWM input invalid

PWM input valid

(External input)

0

1

L

H

L

ON

Forced OFF

ON

H

L E D E N

S oft start

V O U T

W P W M IN

W P W M E N

L E D C urrent

WPWMIN input before LEDEN=1 is enable.

Setting PWMEN=1 before LEDEN=1 is enable.

PWM control is effective at the LED current rises up.

PWM “H” pulse width must be more than 50μs.

www.rohm.com

2011.07 - Rev.B

26/30

BD60910GU

Technical Note

6. The explanation of I/O

When the RESETB pin ”L”, the input buffers (SDA and SCL) are disabling for the low consumption power.

RESETB=L

Output “H”

SCL

SDA

LOGIC

EN

RESETB

7. The unused terminal

Set up of the unused terminal is follows.

T1, T4 : Short to ground

T2, T3 : Open

GC1, GC2 : Open

www.rohm.com

2011.07 - Rev.B

27/30

BD60910GU

Technical Note

●Notes for use

(1) Absolute Maximum Ratings

An excess in the absolute maximum ratings, such as supply voltage, temperature range of operating conditions, etc.,

can break down devices, thus making impossible to identify breaking mode such as a short circuit or an open circuit. If

any special mode exceeding the absolute maximum ratings is assumed, consideration should be given to take physical

safety measures including the use of fuses, etc.

(2) Power supply and ground line

Design PCB pattern to provide low impedance for the wiring between the power supply and the ground lines. Pay attention

to the interference by common impedance of layout pattern when there are plural power supplies and ground lines.

Especially, when there are ground pattern for small signal and ground pattern for large current included the external

circuits, please separate each ground pattern. Furthermore, for all power supply pins to ICs, mount a capacitor between

the power supply and the ground pin. At the same time, in order to use a capacitor, thoroughly check to be sure the

characteristics of the capacitor to be used present no problem including the occurrence of capacity dropout at a low

temperature, thus determining the constant.

(3) Ground voltage

Make setting of the potential of the ground pin so that it will be maintained at the minimum in any operating state.

Furthermore, check to be sure no pins are at a potential lower than the ground voltage including an actual electric

transient.

(4) Short circuit between pins and erroneous mounting

In order to mount ICs on a set PCB, pay thorough attention to the direction and offset of the ICs. Erroneous mounting

can break down the ICs. Furthermore, if a short circuit occurs due to foreign matters entering between pins or between

the pin and the power supply or the ground pin, the ICs can break down.

(5) Operation in strong electromagnetic field

Be noted that using ICs in the strong electromagnetic field can malfunction them.

(6) Input pins

In terms of the construction of IC, parasitic elements are inevitably formed in relation to potential. The operation of the

parasitic element can cause interference with circuit operation, thus resulting in a malfunction and then breakdown of

the input pin. Therefore, pay thorough attention not to handle the input pins, such as to apply to the input pins a voltage

lower than the ground respectively, so that any parasitic element will operate. Furthermore, do not apply a voltage to

the input pins when no power supply voltage is applied to the IC. In addition, even if the power supply voltage is

applied, apply to the input pins a voltage lower than the power supply voltage or within the guaranteed value of

electrical characteristics.

(7) External capacitor

In order to use a ceramic capacitor as the external capacitor, determine the constant with consideration given to a

degradation in the nominal capacitance due to DC bias and changes in the capacitance due to temperature, etc.

(8) Thermal shutdown circuit (TSD)

This LSI builds in a thermal shutdown (TSD) circuit. When junction temperatures become detection temperature or

higher, the thermal shutdown circuit operates and turns a switch OFF. The thermal shutdown circuit, which is aimed at

isolating the LSI from thermal runaway as much as possible, is not aimed at the protection or guarantee of the LSI.

Therefore, do not continuously use the LSI with this circuit operating or use the LSI assuming its operation.

(9) Thermal design

Perform thermal design in which there are adequate margins by taking into account the permissible dissipation (Pd) in

actual states of use.

(10) About the pin for the test, the un-use pin

Prevent a problem from being in the pin for the test and the un-use pin under the state of actual use. Please refer to a

function manual and an application notebook. And, as for the pin that doesn't specially have an explanation, ask our

company person in charge.

(11) About the rush current

For ICs with more than one power supply, it is possible that rush current may flow instantaneously due to the internal

powering sequence and delays. Therefore, give special consideration to power coupling capacitance, power wiring,

width of ground wiring, and routing of wiring.

(12) About the function description or application note or more.

The function description and the application notebook are the design materials to design a set. So, the contents of the

materials aren't always guaranteed. Please design application by having fully examination and evaluation include the

external elements.

www.rohm.com

2011.07 - Rev.B

28/30

BD60910GU

Technical Note

●Power dissipation (On the ROHM’s Power dissipation measuring board)

1.6

1.4

1250mW

1.2

1.0

0.8

0.6

0.4

0.2

0.0

0

25

50

75

100

125

150

Ta（℃）

www.rohm.com

2011.07 - Rev.B

29/30

BD60910GU

●Ordering part number

B D

Technical Note

6

0

9

1

0

G U

-

E

2

Part No.

Package

Packaging and forming specification

E2: Embossed tape and reel

GU: VCSP85H3

VCSP85H3 (BD60910GU)

Tape

Embossed carrier tape (heat sealing method)

1PIN MARK

Quantity

2500pcs

E2

Direction

of feed

3.00 0.05

The direction is the 1pin of product is at the upper left when you hold

reel on the left hand and you pull out the tape on the right hand

(

)

S

0.06

S

φ

24- 0.30 0.05

0.05

A B

A

E

D

C

B

φ

(

0.15)INDEX POST

A

1

2 3 4 5

Direction of feed

1pin

0.50 0.05

P=0.5×4

Reel

(Unit : mm)

Order quantity needs to be multiple of the minimum quantity.

∗

www.rohm.com

2011.07 - Rev.B

30/30

Notice

N o t e s

No copying or reproduction of this document, in part or in whole, is permitted without the

consent of ROHM Co.,Ltd.

The content speciﬁed herein is subject to change for improvement without notice.

The content speciﬁed herein is for the purpose of introducing ROHM's products (hereinafter

"Products"). If you wish to use any such Product, please be sure to refer to the speciﬁcations,

which can be obtained from ROHM upon request.

Examples of application circuits, circuit constants and any other information contained herein

illustrate the standard usage and operations of the Products. The peripheral conditions must

be taken into account when designing circuits for mass production.

Great care was taken in ensuring the accuracy of the information speciﬁed in this document.

However, should you incur any damage arising from any inaccuracy or misprint of such

information, ROHM shall bear no responsibility for such damage.

The technical information speciﬁed herein is intended only to show the typical functions of and

examples of application circuits for the Products. ROHM does not grant you, explicitly or

implicitly, any license to use or exercise intellectual property or other rights held by ROHM and

other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the

use of such technical information.

The Products speciﬁed in this document are intended to be used with general-use electronic

equipment or devices (such as audio visual equipment, ofﬁce-automation equipment, commu-

nication devices, electronic appliances and amusement devices).

The Products speciﬁed in this document are not designed to be radiation tolerant.

While ROHM always makes efforts to enhance the quality and reliability of its Products, a

Product may fail or malfunction for a variety of reasons.

Please be sure to implement in your equipment using the Products safety measures to guard

against the possibility of physical injury, ﬁre or any other damage caused in the event of the

failure of any Product, such as derating, redundancy, ﬁre control and fail-safe designs. ROHM

shall bear no responsibility whatsoever for your use of any Product outside of the prescribed

scope or not in accordance with the instruction manual.

The Products are not designed or manufactured to be used with any equipment, device or

system which requires an extremely high level of reliability the failure or malfunction of which

may result in a direct threat to human life or create a risk of human injury (such as a medical

instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuel-

controller or other safety device). ROHM shall bear no responsibility in any way for use of any

of the Products for the above special purposes. If a Product is intended to be used for any

such special purpose, please contact a ROHM sales representative before purchasing.

If you intend to export or ship overseas any Product or technology speciﬁed herein that may

be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to

obtain a license or permit under the Law.

Thank you for your accessing to ROHM product informations.

More detail product informations and catalogs are available, please contact us.

ROHM Customer Support System

http://www.rohm.com/contact/

www.rohm.com

R1120

A


型号：	BD60910GU-E2
厂家：	ROHM
描述：	White backlight LED Drivers for Small to Medium LCD Panels (Switching Regulator Type) 白色背光LED驱动器适用于中小型液晶面板（开关稳压器型）显示驱动器稳压器驱动程序和接口开关接口集成电路 CD
文件：	总31页 (文件大小：475K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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