Datasheet BD60910GU Datasheet (ROHM)

LED Drivers for LCD Backlights

White backlight LED Drivers
for Small to Medium LCD Panels
(Switching Regulator Type)

BD60910GU

●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)

2

5) I

6) VCSP85H3(3.00mm

●Absolute Maximum Ratings (Ta=25

C BUS FS mode（max 400kHz）Write/Read

Parameter Symbol Ratings Unit Pins

x 3.00mm) Small Size CSP package

℃)

No.11040EBT30

Maximum voltage 1 VMAX1 7 V except for VLED VOUT, SW

Maximum voltage 2 VMAX2 15 V VLED

Maximum voltage 3 VMAX3 40 V VOUT, SW

Power Dissipation Pd 1250 *1 mW
Operating Temperature Range Topr -40 ~ +85 ℃
Storage Temperature Range Tstg -55 ~ +150 ℃

*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 VBAT 2.7~5.5 V

VIO pin voltage VIO 1.65~3.3 V

www.rohm.com

© 2011 ROHM Co., Ltd. All rights reserved.

℃)

1/30

2011.07 - Rev.B

BD60910GU

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

Parameter Symbol

【Circuit Current】

VBAT Circuit current 1 IBAT1 - 0.1 1.0 A RESETB=0V, VIO=0V

VBAT Circuit current 2 IBAT2 - 0.5 3.0 A RESETB=0V, VIO=1.8V

Min. Typ. Max.

Limits

Unit Condition

Technical Note

VBAT Circuit current 3 IBAT3 - 3.5 5.0 mA

VBAT Circuit current 4 IBAT4 - 0.4 1.0 mA

【LED Driver】

LED current Step (Setup) ILEDSTP1 128 Step

LED current Step (At slope) ILEDSTP2 256 Step

LED Maximum current IMAXWLED - 25.6 - mA

LED current accuracy IWLED -7% 15 +7% mA I

【DC/DC】

VLED pin feedback voltage Vfb - 0.3 - V

Over current protection OCP - 650 - mA

Oscillator frequency fosc 0.8 1.0 1.2 MHz

OVP1 30 31 32 V

Over Voltage Protection detect
voltage

OVP2 - 27 - V
OVP3 - 24 - V
OVP4 - 21 - V
OVP5 - 18 - V

LED=ON, ILED=15mA setting
Vo=24V

Only ALC block ON
ADCYC=0.52s setting
Except sensor current

=15mA setting

LED

Maximum Duty Mduty 92.5 - - %

VOUT open protection OVO - 0.7 1.4 V

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

Parameter Symbol

【I2C Input (SDA, SCL)】

LOW level input voltage VIL -0.3 -

HIGH level input voltage VIH

Hysteresis of Schmitt trigger
input

LOW level output voltage
(SDA) at 3mA sink current

Input current each I/O pin lin -3 - 3 A Input voltage = 0.1×VIO~0.9×VIO

【RESETB】

LOW level input voltage VIL -0.3 -

HIGH level input voltage VIH

Input current each I/O pin Iin -3 - 3 A Input voltage = 0.1×VIO~0.9×VIO

Vhys

VOL 0 - 0.3 V

Min. Typ. Max.

0.75 ×
VIO

0.05 ×
VIO

0.75 ×
VIO

Limits

0.25 ×
VIO

VBAT

­+0.3

- - V

0.25 ×
VIO

VBAT

­+0.3

Unit Condition

V

V

V

V

www.rohm.com

© 2011 ROHM Co., Ltd. All rights reserved.

2/30

2011.07 - Rev.B

BD60910GU

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

Parameter Symbol

【ALC】

SBIAS Output voltage VoS

SBIAS Output current IoS - - 30 mA Vo=3.0V

Min. Typ. Max.

2.850 3.0 3.150 V Io=200A <Initial value>

2.470 2.6 2.730 V Io=200A

Limits

Unit Condition

Technical Note

SSENS Input range VISS 0 -

SBIAS Discharge resister at
OFF

ADC resolution ADRES 8 bit

ADC non-linearity error ADINL -3 - +3 LSB

ADC differential non-linearity
error

SSENS Input impedance RSSENS 1 - - M

【WPWMIN】

L level input voltage VILA -0.3 - 0.3 V

H level input voltage VIHA 1.4 -

Input current IinA - 3.6 10 A Vin=1.8V

PWM input minimum High
pulse width

【GC1, GC2】

L level output voltage VOLS - - 0.2 V IOL=1mA

H level output voltage VOHS

ROFFS - 1.0 1.5 k

ADDNL -1 - +1 LSB

PWpwm 50 - - s

VoS

-0.2

VoS x

255/256

VBAT

+0.3

- - V IOH=1mA

V

V

www.rohm.com

© 2011 ROHM Co., Ltd. All rights reserved.

3/30

2011.07 - Rev.B

BD60910GU

A

( )

( )

( )

●Block Diagram / Application Circuit example

VBAT

VBAT1

VBAT2

10µF

VIO

RESETB

SCL

SD

I/O

Level

Shift

WPWMIN

Photo IC

GC1

GC2

BH1600FVC

VDD

GND

IOUT

*

5.6k

SBIAS

SSENS

SGND

1F

Sensor

I/F

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

22H

2

C interface

I

Digital Control

ALC

RB520S-40

SW

DC/DC

External PWM

TSD

IREF

1F(50V)

T1

OCP

T2

GNDP

VREF

(Open)

T3

(Open)

GNDPS

OVP

Feed Back

T4

Technical Note

VOUT

VLED

LEDGND

GND1

GND2

www.rohm.com

© 2011 ROHM Co., Ltd. All rights reserved.

4/30

2011.07 - Rev.B

BD60910GU

●Pin Arrangement [Bottom View］

●Pin Functions

T4 GND2 GNDP SW T3

E

VIO SCL RESETB GNDPS VBAT2

D

GND1 SDA VOUT GC2 SGND

C

index

WPWMIN

B

T1 VBAT1 LEDGND VLED T2

A

GC1 SBIAS SSENS

12345

Fig.2 Pin Arrangement

Technical Note

No Ball No. Pin Name I/O

1 A2 VBAT1 - - GND Power supply A
2 D5 VBAT2 - - GND Power supply A

3 D1 VIO - VBAT GND Power supply for I/O C

4 C1 GND1 - VBAT - Ground B

5 E2 GND2 - VBAT - Ground B

6 A3 LEDGND - VBAT - Ground B

7 E3 GNDP - VBAT - Ground B

8 D4 GNDPS - VBAT - Ground B

9 C5 SGND - VBAT - Ground B

10 D3 RESETB I VBAT GND Reset input (L: reset, H: reset cancel) H

11 C2 SDA I/O VBAT GND I2C data input / output I

12 D2 SCL I VBAT GND I2C clock input H
13 B1 WPWMIN I VBAT GND External PWM input L

14 E4 SW O - GND DC/DC Switching port A

15 C3 VOUT O - GND DC/DC output voltage monitor A

16 A4 VLED I - GND LED cathode connection E

17 B4 SBIAS O VBAT GND Bias output for the Ambient Light Sensor Q

18 B5 SSENS I VBAT GND Ambient Light Sensor input N
19 B3 GC1 O VBAT GND Ambient Light Sensor gain control output 1 X
20 C4 GC2 O VBAT GND Ambient Light Sensor gain control output 2 X
21 A1 T1 I VBAT GND Test Input Pin (short to Ground) S
22 A5 T2 O VBAT GND Test Output Pin (Open) M
23 E5 T3 O VBAT GND Test Output Pin (Open) N

24 E1 T4 I VBAT GND Test Input Pin (short to Ground) S

ESD Diode

For Power For Ground

Functions

Equivalent

Circuit

www.rohm.com

© 2011 ROHM Co., Ltd. All rights reserved.

5/30

2011.07 - Rev.B

BD60910GU

●Equivalent Circuit

A VBATB E

C

VBAT

Technical Note

H VIOVBAT I

N

VIO VBAT

VBAT

Q

VBAT VBAT

VBATVBATL

S

VBATVBAT

M

X

VoS VBAT

VBAT

www.rohm.com

© 2011 ROHM Co., Ltd. All rights reserved.

6/30

2011.07 - Rev.B

BD60910GU

Technical Note

●I2C BUS format

The writing/reading operation is based on the I

2

C slave standard.

・ Slave address

A7 A6 A5 A4 A3 A2 A1 R/W

1 1 1 0 1 1 0 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 I

2

C- 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

START condition

STOP 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

DATA OUTPUT
BY RECEIVER

SCL

START condition

S

12 89

not acknowledge

acknowledge

clock pulse for
acknowledgement

www.rohm.com

© 2011 ROHM Co., Ltd. All rights reserved.

7/30

2011.07 - Rev.B

BD60910GU

A A

A

A

A7 A6 A5A4A3A2A1A

A

A

A

A

A

A

A

A A

A

A

A6A5A4A3A2A1A

A

A

A

A

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 *1

D7D6 D5 D4 D3 D2 D1D0 D7 D6 D5 D4 D3 D2 D1 D0

X X X X X X X

S

R/W=0(write)

from master to slave

from slave to master

register addressslave address

00

DATA

register address

increment

=acknowledge(SDA LOW)

=not acknowledge(SDA HIGH)
S=START condition
P=STOP condition
*1: Write Timing

DATA

register address

・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.

X X X X X X X

R/W=1(read)

from master to slave

from slave to master

P

D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0

DATA

register address

increment

=acknowledge(SDA LOW)

=not acknowledge(SDA HIGH)
S=START condition
P=STOP condition

DATA slave address

register address

increment

1 S

・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.

P

increment

S

slave address

R/W=0(write)

from master to slave

from slave to master

0

7

register address

D7 D6 D5 D4 D3D2D1D0 D7 D6 D5 D4 D3 D2 D1D0

DATA DATA

register address

increment

Sr 1

0X X X X X X X

X X X X X X X

slave address

=acknowledge(SDA LOW)

=not acknowledge(SDA HIGH)
S=START condition
P=STOP condition
Sr=repeated START condition

R/W=1(read)

P

register address

increment

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.

www.rohm.com

© 2011 ROHM Co., Ltd. All rights reserved.

8/30

2011.07 - Rev.B

BD60910GU

S

●Timing diagram

SDA

CL

t

LOW

t

SU;DAT

HD;STA

t

Technical Note

t BUF

t SU;STO

S

SU;STA

t

HD;STA

t

HD;DAT

t

S Sr P

HIGH

t

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

Standard-mode Fast-mode

Parameter Symbol

Unit

Min. Typ. Max. Min. Typ. Max.

2

【I

C BUS format】

SCL clock frequency fSCL 0 - 100 0 - 400 kHz

LOW period of the SCL clock tLOW 4.7 - - 1.3 - - s

HIGH period of the SCL clock tHIGH 4.0 - - 0.6 - - s

Hold time (repeated) START condition
After this period, the first clock is generated

Set-up time for a repeated START
condition

tHD;STA 4.0 - - 0.6 - - s

t

SU;STA 4.7 - - 0.6 - - s

Data hold time tHD;DAT 0 - 3.45 0 - 0.9 s

Data set-up time tSU;DAT 250 - - 100 - - ns

Set-up time for STOP condition tSU;STO 4.0 - - 0.6 - - s

Bus free time between a STOP
and START condition

BUF 4.7 - - 1.3 - - s

t

www.rohm.com

© 2011 ROHM Co., Ltd. All rights reserved.

9/30

2011.07 - Rev.B

BD60910GU

●Register List

Input "0” for "-".

Address W/R

Technical Note

Register data

Function

D7 D6 D5 D4 D3 D2 D1 D0

00h W - - - - - - - SFTRST

01h R/W - VOVP(2) VOVP(1) VOVP(0) WPWMEN ALCEN LEDMD LEDEN LED, ALC, OVP Control

02h - - - - - - - - - -

03h R/W - ILED(6) ILED(5) ILED(4) ILED(3) ILED(2) ILED(1) ILED(0)

04h - - - - - - - - - -

05h - - - - - - - - - -

06h - - - - - - - - - -

07h - - - - - - - - - -

08h W THL(3) THL(2) THL(1) THL(0) TLH(3) TLH(2) TLH(1) TLH(0) LED Current transition

09h - - - - - - - - - -

0Ah - - - - - - - - - -

0Bh R/W ADCYC(1) ADCYC(0) GAIN(1) GAIN(0) STYPE VSB MDCIR SBIASON ALC mode setting

0Ch - - - - - - - - - -

0Dh R - - - - AMB(3) AMB(2) AMB(1) AMB(0) Ambient level output

0Eh W - IU0(6) IU0(5) IU0(4) IU0(3) IU0(2) IU0(1) IU0(0) LED Current at Ambient level 0h

0Fh W - IU1(6) IU1(5) IU1(4) IU1(3) IU1(2) IU1(1) IU1(0) LED Current at Ambient level 1h

10h W - IU2(6) IU2(5) IU2(4) IU2(3) IU2(2) IU2(1) IU2(0) LED Current at Ambient level 2h

Software Reset

LED Current Setting
at non-ALC mode

11h W - IU3(6) IU3(5) IU3(4) IU3(3) IU3(2) IU3(1) IU3(0) LED Current at Ambient level 3h

12h W - IU4(6) IU4(5) IU4(4) IU4(3) IU4(2) IU4(1) IU4(0) LED Current at Ambient level 4h

13h W - IU5(6) IU5(5) IU5(4) IU5(3) IU5(2) IU5(1) IU5(0) LED Current at Ambient level 5h

14h W - IU6(6) IU6(5) IU6(4) IU6(3) IU6(2) IU6(1) IU6(0) LED Current at Ambient level 6h

15h W - IU7(6) IU7(5) IU7(4) IU7(3) IU7(2) IU7(1) IU7(0) LED Current at Ambient level 7h

16h W - IU8(6) IU8(5) IU8(4) IU8(3) IU8(2) IU8(1) IU8(0) LED Current at Ambient level 8h

17h W - IU9(6) IU9(5) IU9(4) IU9(3) IU9(2) IU9(1) IU9(0) LED Current at Ambient level 9h

18h W - IUA(6) IUA(5) IUA(4) IUA(3) IUA(2) IUA(1) IUA(0) LED Current at Ambient level Ah

19h W - IUB(6) IUB(5) IUB(4) IUB(3) IUB(2) IUB(1) IUB(0) LED Current at Ambient level Bh

1Ah W - IUC(6) IUC(5) IUC(4) IUC(3) IUC(2) IUC(1) IUC(0) LED Current at Ambient level Ch

1Bh W - IUD(6) IUD(5) IUD(4) IUD(3) IUD(2) IUD(1) IUD(0) LED Current at Ambient level Dh

1Ch W - IUE(6) IUE(5) IUE(4) IUE(3) IUE(2) IUE(1) IUE(0) LED Current at Ambient level Eh

1Dh W - IUF(6) IUF(5) IUF(4) IUF(3) IUF(2) IUF(1) IUF(0) LED Current at Ambient level Fh

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)

www.rohm.com

© 2011 ROHM Co., Ltd. All rights reserved.

10/30

2011.07 - Rev.B

BD60910GU

●Register Map

Address 00h < Software Reset >

Address R/W Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

00h W - - - - - - - SFTRST

Initial
Value

00h - - - - - - - 0

Bit [7:1] : (Not used)

Bit0 : SFTRST Software Reset Command

“0” : Reset cancel
“1” : Reset (All register initializing)

Refer to “Explanation 1” for detail.

Address 01h < LED, ALC Control >

Address R/W Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

01h R/W - VOVP(2) VOVP(1) VOVP(0) WPWMEN ALCEN LEDMD LEDEN

Initial
Value

Bit7 : (Not used)

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

Refer to “Explanation 4” for detail.

Bit3 : WPWMEN External PWM Input “WPWMIN” terminal Enable Control (Valid/Invalid)

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

Bit2 : ALCEN ALC Function Control (ON/OFF)

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

Bit1 : LEDMD LED Mode Select (ALC mode/Register mode)

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

Bit0 : LEDEN LED Control (ON/OFF)

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

00h - 0 0 0 0 0 0 0

“000” : OVP=31V(typ) 8LED connection
“001” : OVP=27V(typ) 7LED connection
“010” : OVP=24V(typ) 6LED connection
“011” : OVP=21V(typ) 5LED connection
“100” : OVP=18V(typ) 4LED connection
“101” : Don’t use
“110” : Don’t use
“111” : Don’t use

“0” : WPWMIN input invalid
“1” : WPWMIN input valid

“0” : ALC function OFF
“1” : ALC function ON

“0” : Register mode
“1” : ALC mode

“0” : LED OFF
“1” : LED ON

Technical Note

www.rohm.com

© 2011 ROHM Co., Ltd. All rights reserved.

11/30

2011.07 - Rev.B

BD60910GU

Address 03h < LED Current Setting at Register mode >

Address R/W Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

03h R/W - ILED(6) ILED(5) ILED(4) ILED(3) ILED(2) ILED(1) ILED(0)

Initial
Value

Bit7 : (Not used)

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

00h - 0 0 0 0 0 0 0

“0000000” : 0.2 mA “1000000” : 13.0 mA
“0000001” : 0.4 mA “1000001” : 13.2 mA
“0000010” : 0.6 mA “1000010” : 13.4 mA
“0000011” : 0.8 mA “1000011” : 13.6 mA
“0000100” : 1.0 mA “1000100” : 13.8 mA
“0000101” : 1.2 mA “1000101” : 14.0 mA
“0000110” : 1.4 mA “1000110” : 14.2 mA
“0000111” : 1.6 mA “1000111” : 14.4 mA
“0001000” : 1.8 mA “1001000” : 14.6 mA
“0001001” : 2.0 mA “1001001” : 14.8 mA
“0001010” : 2.2 mA “1001010” : 15.0 mA
“0001011” : 2.4 mA “1001011” : 15.2 mA
“0001100” : 2.6 mA “1001100” : 15.4 mA
“0001101” : 2.8 mA “1001101” : 15.6 mA
“0001110” : 3.0 mA “1001110” : 15.8 mA
“0001111” : 3.2 mA “1001111” : 16.0 mA
“0010000” : 3.4 mA “1010000” : 16.2 mA
“0010001” : 3.6 mA “1010001” : 16.4 mA
“0010010” : 3.8 mA “1010010” : 16.6 mA
“0010011” : 4.0 mA “1010011” : 16.8 mA
“0010100” : 4.2 mA “1010100” : 17.0 mA
“0010101” : 4.4 mA “1010101” : 17.2 mA

“0010110” : 4.6 mA “1010110” : 17.4 mA
“0010111” : 4.8 mA “1010111” : 17.6 mA
“0011000” : 5.0 mA “1011000” : 17.8 mA

“0011001” : 5.2 mA “1011001” : 18.0 mA

“0011010” : 5.4 mA “1011010” : 18.2 mA

“0011011” : 5.6 mA “1011011” : 18.4 mA

“0011100” : 5.8 mA “1011100” : 18.6 mA

“0011101” : 6.0 mA “1011101” : 18.8 mA

“0011110” : 6.2 mA “1011110” : 19.0 mA

“0011111” : 6.4 mA “1011111” : 19.2 mA

“0100000” : 6.6 mA “1100000” : 19.4 mA
“0100001” : 6.8 mA “1100001” : 19.6 mA
“0100010” : 7.0 mA “1100010” : 19.8 mA
“0100011” : 7.2 mA “1100011” : 20.0 mA
“0100100” : 7.4 mA “1100100” : 20.2 mA

“0100101” : 7.6 mA “1100101” : 20.4 mA

“0100110” : 7.8 mA “1100110” : 20.6 mA

“0100111” : 8.0 mA “1100111” : 20.8 mA

“0101000” : 8.2 mA “1101000” : 21.0 mA
“0101001” : 8.4 mA “1101001” : 21.2 mA
“0101010” : 8.6 mA “1101010” : 21.4 mA

“0101011” : 8.8 mA “1101011” : 21.6 mA

“0101100” : 9.0 mA “1101100” : 21.8 mA

“0101101” : 9.2 mA “1101101” : 22.0 mA

“0101110” : 9.4 mA “1101110” : 22.2 mA
“0101111” : 9.6 mA “1101111” : 22.4 mA
“0110000” : 9.8 mA “1110000” : 22.6 mA

“0110001” : 10.0 mA “1110001” : 22.8 mA

“0110010” : 10.2 mA “1110010” : 23.0 mA

“0110011” : 10.4 mA “1110011” : 23.2 mA

“0110100” : 10.6 mA “1110100” : 23.4 mA

“0110101” : 10.8 mA “1110101” : 23.6 mA

“0110110” : 11.0 mA “1110110” : 23.8 mA

“0110111” : 11.2 mA “1110111” : 24.0 mA

“0111000” : 11.4 mA “1111000” : 24.2 mA

“0111001” : 11.6 mA “1111001” : 24.4 mA

“0111010” : 11.8 mA “1111010” : 24.6 mA

“0111011” : 12.0 mA “1111011” : 24.8 mA

“0111100” : 12.2 mA “1111100” : 25.0 mA

“0111101” : 12.4 mA “1111101” : 25.2 mA

“0111110” : 12.6 mA “1111110” : 25.4 mA

“0111111” : 12.8 mA “1111111” : 25.6 mA

Technical Note

www.rohm.com

© 2011 ROHM Co., Ltd. All rights reserved.

12/30

2011.07 - Rev.B

BD60910GU

Address 08h < LED Current transition >

Address R/W Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

08h W THL(3) THL(2) THL(1) THL(0) TLH(3) TLH(2) TLH(1) TLH(0)

Initial
Value

Bit [7:4] : THL(3:0) LED current Down transition per 0.2mA step

Bit [3:0] : TLH(3:0) LED current Up transition per 0.2mA step

C7h 1 1 0 0 0 1 1 1

“0000” : 0.256 ms
“0001” : 0.512 ms
“0010” : 1.024 ms
“0011” : 2.048 ms
“0100” : 4.096 ms
“0101” : 8.192 ms
“0110” : 16.38 ms
“0111” : 32.77 ms
“1000” : 65.54 ms
“1001” : 131.1 ms
“1010” : 196.6 ms
“1011” : 262.1 ms
“1100” : 327.7 ms (Initial value)
“1101” : 393.2 ms
“1110” : 458.8 ms
“1111” : 524.3 ms

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

“0000” : 0.256 ms
“0001” : 0.512 ms
“0010” : 1.024 ms
“0011” : 2.048 ms
“0100” : 4.096 ms
“0101” : 8.192 ms
“0110” : 16.38 ms
“0111” : 32.77 ms (Initial value)
“1000” : 65.54 ms
“1001” : 131.1 ms
“1010” : 196.6 ms
“1011” : 262.1 ms
“1100” : 327.7 ms
“1101” : 393.2 ms
“1110” : 458.8 ms
“1111” : 524.3 ms

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

Technical Note

www.rohm.com

© 2011 ROHM Co., Ltd. All rights reserved.

13/30

2011.07 - Rev.B

BD60910GU

Address 0Bh < ALC mode setting >

Address R/W Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0Bh R/W ADCYC(1) ADCYC(0) GAIN(1) GAIN(0) STYPE VSB MDCIR SBIASON

Initial
Value

Bit [7:6] : ADCYC(1:0) ADC Measurement Cycle

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

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

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

Bit3 : STYPE Ambient Light Sensor Type Select (Linear/Logarithm)

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

Bit2 : VSB SBIAS Output Voltage Control

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

Bit1 : MDCIR LED Current Reset Select by Mode Change

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

Bit0 : SBIASON SBIAS Control (ON/OFF)

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

81h 1 0 0 0 0 0 0 1

“00” : 0.52 s
“01” : 1.05 s
“10” : 1.57 s (Initial value)
“11” : 2.10 s

“00” : Auto Change (Initial value)
“01” : Manual High
“10” : Manual Low
“11” : Fixed

“0” : For Linear Sensor (Initial value)
“1” : For Log Sensor

“0” : SBIAS output voltage 3.0V (Initial value)
“1” : SBIAS output voltage 2.6V

“0” : LED current non-reset at mode change (Initial value)
“1” : LED current reset at mode change

“0” : Measurement cycle synchronous
“1” : Usually ON (at ALCEN=1) (Initial value)

Technical Note

www.rohm.com

© 2011 ROHM Co., Ltd. All rights reserved.

14/30

2011.07 - Rev.B

BD60910GU

Address 0Dh < Ambient level (Read Only) >

Address R/W Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

0Dh R - - - - AMB(3) AMB(2) AMB(1) AMB(0)

Initial
Value

Bit [7:4] : (Not used)

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

The data can be read through I
Refer to “Explanation 5-(6)” for detail.

- - - - - - - - -

“0000” : 0h
“0001” : 1h
“0010” : 2h
“0011” : 3h
“0100” : 4h
“0101” : 5h
“0110” : 6h
“0111” : 7h
“1000” : 8h
“1001” : 9h
“1010” : Ah
“1011” : Bh
“1100” : Ch
“1101” : Dh
“1110” : Eh
“1111” : Fh

2

C.

Technical Note

www.rohm.com

© 2011 ROHM Co., Ltd. All rights reserved.

15/30

2011.07 - Rev.B

BD60910GU

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

Address R/W Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

Technical Note

0Eh~1Dh W -

Initial
Value

-

“*” means 0~F.

Bit7 : (Not used)

Bit [6:0] : IU

*(6:0) LED Current at Ambient Level for 0h~Fh

IU*(6) IU*(5) IU*(4) IU*(3) IU*(2) IU*(1) IU*(0)

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

“0000000” : 0.2 mA “1000000” : 13.0 mA

“0000001” : 0.4 mA “1000001” : 13.2 mA

“0000010” : 0.6 mA “1000010” : 13.4 mA

“0000011” : 0.8 mA “1000011” : 13.6 mA
“0000100” : 1.0 mA “1000100” : 13.8 mA
“0000101” : 1.2 mA “1000101” : 14.0 mA
“0000110” : 1.4 mA “1000110” : 14.2 mA

“0000111” : 1.6 mA “1000111” : 14.4 mA

“0001000” : 1.8 mA “1001000” : 14.6 mA

“0001001” : 2.0 mA “1001001” : 14.8 mA

“0001010” : 2.2 mA “1001010” : 15.0 mA

“0001011” : 2.4 mA “1001011” : 15.2 mA

“0001100” : 2.6 mA “1001100” : 15.4 mA

“0001101” : 2.8 mA “1001101” : 15.6 mA

“0001110” : 3.0 mA “1001110” : 15.8 mA

“0001111” : 3.2 mA “1001111” : 16.0 mA
“0010000” : 3.4 mA “1010000” : 16.2 mA
“0010001” : 3.6 mA “1010001” : 16.4 mA
“0010010” : 3.8 mA “1010010” : 16.6 mA
“0010011” : 4.0 mA “1010011” : 16.8 mA
“0010100” : 4.2 mA “1010100” : 17.0 mA
“0010101” : 4.4 mA “1010101” : 17.2 mA
“0010110” : 4.6 mA “1010110” : 17.4 mA
“0010111” : 4.8 mA “1010111” : 17.6 mA
“0011000” : 5.0 mA “1011000” : 17.8 mA

“0011001” : 5.2 mA “1011001” : 18.0 mA

“0011010” : 5.4 mA “1011010” : 18.2 mA

“0011011” : 5.6 mA “1011011” : 18.4 mA

“0011100” : 5.8 mA “1011100” : 18.6 mA

“0011101” : 6.0 mA “1011101” : 18.8 mA

“0011110” : 6.2 mA “1011110” : 19.0 mA

“0011111” : 6.4 mA “1011111” : 19.2 mA

“0100000” : 6.6 mA “1100000” : 19.4 mA
“0100001” : 6.8 mA “1100001” : 19.6 mA
“0100010” : 7.0 mA “1100010” : 19.8 mA
“0100011” : 7.2 mA “1100011” : 20.0 mA
“0100100” : 7.4 mA “1100100” : 20.2 mA

“0100101” : 7.6 mA “1100101” : 20.4 mA

“0100110” : 7.8 mA “1100110” : 20.6 mA

“0100111” : 8.0 mA “1100111” : 20.8 mA

“0101000” : 8.2 mA “1101000” : 21.0 mA
“0101001” : 8.4 mA “1101001” : 21.2 mA
“0101010” : 8.6 mA “1101010” : 21.4 mA

“0101011” : 8.8 mA “1101011” : 21.6 mA

“0101100” : 9.0 mA “1101100” : 21.8 mA

“0101101” : 9.2 mA “1101101” : 22.0 mA

“0101110” : 9.4 mA “1101110” : 22.2 mA
“0101111” : 9.6 mA “1101111” : 22.4 mA
“0110000” : 9.8 mA “1110000” : 22.6 mA

“0110001” : 10.0 mA “1110001” : 22.8 mA

“0110010” : 10.2 mA “1110010” : 23.0 mA

“0110011” : 10.4 mA “1110011” : 23.2 mA

“0110100” : 10.6 mA “1110100” : 23.4 mA

“0110101” : 10.8 mA “1110101” : 23.6 mA

“0110110” : 11.0 mA “1110110” : 23.8 mA

“0110111” : 11.2 mA “1110111” : 24.0 mA

“0111000” : 11.4 mA “1111000” : 24.2 mA

“0111001” : 11.6 mA “1111001” : 24.4 mA

“0111010” : 11.8 mA “1111010” : 24.6 mA

“0111011” : 12.0 mA “1111011” : 24.8 mA

“0111100” : 12.2 mA “1111100” : 25.0 mA

“0111101” : 12.4 mA “1111101” : 25.2 mA

“0111110” : 12.6 mA “1111110” : 25.4 mA

“0111111” : 12.8 mA “1111111” : 25.6 mA

www.rohm.com

© 2011 ROHM Co., Ltd. All rights reserved.

16/30

2011.07 - Rev.B

BD60910GU

●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

Technical Note

www.rohm.com

© 2011 ROHM Co., Ltd. All rights reserved.

17/30

2011.07 - Rev.B

BD60910GU

●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 I
・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 5s.

(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

2

C access are stopped.

℃.

T

VBATOFF

Technical Note

VIO

RESETB

LEDEN

VOUT

LED

Current

T

VIOON=min

T

RSTB=min

Soft start

0.1

ms

0.1

ms

T

VIOOFF=min １ms

T

RST=min 0ms

www.rohm.com

© 2011 ROHM Co., Ltd. All rights reserved.

18/30

2011.07 - Rev.B

BD60910GU

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

(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.

Technical Note

≧ (LED number) x (LED Vf max) +1 [V]

www.rohm.com

© 2011 ROHM Co., Ltd. All rights reserved.

19/30

2011.07 - Rev.B

BD60910GU

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 I

• 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.

Sensor

Usually ON / intermittent

Output Voltage

SBIAS

SBIAS

SSENS

ADC

Data

Correction

Logarithmic Conv.

Ambient Level detect

LIN/LOG

Average

Conversion

Tab l e

Current

Conversion

Mode Sel ect

PWM enabling

Slope Timer

Slope

process

Technical Note

WPWMIN

LED*

2

C I/F.

BackLight

LCD

GC1

GC2

Gain

Control

Sensor Gain Control

Ambient Level

Main current setting

AL C LED co n t r o l

* 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 Mode LED current

0 0 ＊

0 1 0
0 1 1 IU0(6:0) (*1)

OFF

( AMB(3:0)=0h )

1 0 ＊

1 1 0

ON

1 1 1 ALC mode (*2)

(*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.

OFF OFF OFF

ON

Resister

mode

OFF

ON

ALC mode

Main Gr oup

LED Driver

ILED(6:0)

ILED(6:0)

OFF

www.rohm.com

© 2011 ROHM Co., Ltd. All rights reserved.

20/30

2011.07 - Rev.B

BD60910GU

A

A

(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

IOUT

SSENS voltage

VSSENS

Iout

VCC

Sensor IC

GND

SBIAS

SSENS

Rs

SGND

SBIAS

A/D

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

SSENS Voltage = Iout x Rs

Technical Note

Sensor Current (Iout)

mbient

Rs is large

Rs is small

SSENS Voltage (=Iout x Rs)

mbient

www.rohm.com

© 2011 ROHM Co., Ltd. All rights reserved.

21/30

2011.07 - Rev.B

BD60910GU

A

A

A

(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.

Register : GAIN(1:0)

・ GC1 and GC2 are outputted corresponding to each gain status.

Technical Note

High Gain mode

SSENS Voltage

Low Gain mode

mbient

uto Gain mode

SSENS Voltage

mbient

Example 1 (Use BH1600FVC) Example 2 Example 3

Application

example

SBIAS

SBIAS

VCC

IOUT

BH1600

GND

GC1

GC2

SSENS

GC1

GC2

SGND

9.5 (*1)

SSENS

１

GC1

GC2

SGND

SBIAS

SSENS

GC1

GC2

SGND

Resister values are relative

Operating mode Auto

Manual

High Low High Low

Auto

Manual

Fixed

GAIN(1:0) setting 00 01 10 00 01 10 11

Gain status High Low High Low High Low High Low -

GC1 output L L L L

GC2 output L L L L 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 ROHM Co., Ltd. All rights reserved.

22/30

2011.07 - Rev.B

BD60910GU

A

A

A

A

A

A

A

(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

LCEN

DCYC(1:0)

DC Cycle

SBIAS Output

DC Movement

Twait= 64ms(typ)

GC1, GC2

(Wait time)

TAD= 16.4ms(typ)

(A/D conversion time)

When SBIASON=1

D start signal

GC1, GC2=00

MB(3:0)

MB(3:0)

Technical Note

16 times

TADone= 1.024ms(typ)

16 times measurem ent

Toprt= 80.4ms(typ)

(Operate time)

www.rohm.com

© 2011 ROHM Co., Ltd. All rights reserved.

23/30

2011.07 - Rev.B

BD60910GU

(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

Register : STYPE

“0” : For

“1” : For

・ Ambient level is output through I

Register : AMB(3:0)

STYPE 0 1

GAIN(1:0) 00 10 01 11 XX

Ambient

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

type sensor / Logarithm type sensor)

Linear sensor
Log sensor

2

C.

Gain

Status

level

0h

1h VoS×1／256 VoS×1／256 VoS×1／256

2h VoS×2／256 VoS×2／256 VoS×2／256

3h

4h

5h Vo S×0／256

6h Vo S×1／256

7h

8h

9h

Ah

Bh

Ch

Dh

Eh

Fh

Auto Low Auto High Manual Low Manual High Fixed Fixed

SSENS voltage

This area is

not assigned.

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×0／256

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

This area is

not assigned.

This area is

not assigned.

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×0／256 VoS×0／256

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

This area is

not assigned.

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

Technical Note

VoS×0／256
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

www.rohm.com

© 2011 ROHM Co., Ltd. All rights reserved.

24/30

2011.07 - Rev.B

BD60910GU

A

(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 (initial value)

Ambient

Level

Setting data Current value

Ambient

Level

0h 11h 3.6mA 8h 48h 14.6mA

1h 13h 4.0mA 9h 56h 17.4mA

2h 15h 4.4mA Ah 5Fh 19.2mA

3h 18h 5.0mA Bh 63h 20.0mA

4h 1Eh 6.2mA Ch 63h 20.0mA

5h 25h 7.6mA Dh 63h 20.0mA

6h 2Fh 9.6mA Eh 63h 20.0mA

7h 3Bh 12.0mA Fh 63h 20.0mA

(8) Slope process

・ Slope process is given to LED current to dim naturally.
・ LED current changes in the 256Step gradation in sloping.
・ Up(dark→bright),Down(bright→dark) LED current transition speed

are set individually.
Register : THL(3:0)
Register : TLH(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

25.6mA
256

=0.1mA

THL

LED Current

Conversion table
can be changed

mbient Level

Setting data Current value

LED setting data

LED Current

LED current

TLH(3:0)

Up/Down
transition

ed is set

time

Zoom

LED Current

time

Technical Note

THL

spe

TLH(3:0)

www.rohm.com

© 2011 ROHM Co., Ltd. All rights reserved.

25/30

2011.07 - Rev.B

BD60910GU

r

A

r

A

r

r

(9) LED current reset when mode change

・ Selectable the way to sloping at mode change.

(ALCResister)

Resiste

mode

Register : MDCIR

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

ILED(6:0) ILED(6:0)

“1” : LED current reset at mode change

LED current

0m

Resiste

mode

ILED(6:0) ILED(6:0)

LED current

0m

(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.

WPWMEN

0 L ON

0 H ON

1 L Forced OFF

1 H ON

WPWMIN

(External input)

LED current

PWM input invalid

PWM input valid

LEDEN

S o ft s tar t

VOUT

WPWMIN

WPWMEN

LED

Current

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 50

μs.

ALC

mode

IU*(6:0)

MDCIR= “0”

time

ALC

mode

IU*(6:0)

MDCIR= “1”

time

Technical Note

Resiste

mode

Resiste

mode

www.rohm.com

© 2011 ROHM Co., Ltd. All rights reserved.

26/30

2011.07 - Rev.B

BD60910GU

6. The explanation of I/O
When the RESETB pin ”L”, the input buffers (SDA and SCL) are disabling for the low consumption power.

Technical Note

RESETB=L

Output “H”

SCL

7. The unused terminal
Set up of the unused terminal is follows.

T1, T4 : Short to ground
T2, T3 : Open
GC1, GC2 : Open

SDA

RESETB

LOGIC

EN

www.rohm.com

© 2011 ROHM Co., Ltd. All rights reserved.

27/30

2011.07 - Rev.B

BD60910GU

●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.

Technical Note

www.rohm.com

© 2011 ROHM Co., Ltd. All rights reserved.

28/30

2011.07 - Rev.B

BD60910GU

●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

Power Dissipation Pd （W)

0.2

0.0

0 25 50 75 100 125 150

Ta（℃）

Technical Note

www.rohm.com

© 2011 ROHM Co., Ltd. All rights reserved.

29/30

2011.07 - Rev.B

BD60910GU

●Ordering part number

B D 6 0 9 1 0 G U - E 2

Part No. Part No.

VCSP85H3

(φ0.15)INDEX POST

1PIN MARK

24-φ0.30±0.05

0.05

0.50±0.05

(BD60910GU)

3.00±0.05

0.06 S

BA

E
D
C
B
A

12345

P=0.5× 4

<Tape and Reel information>

3.00±0.05

1.0MAX

0.25±0.1

S

A

B

0.50±0.05

P=0.5× 4

(Unit : mm)

Package

GU: VCSP85H3

Embossed carrier tape(heat sealing method)Tape

Quantity

Direction
of feed

2500pcs
E2

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

Reel

Packaging and forming specification
E2: Embossed tape and reel

1pin

Order quantity needs to be multiple of the minimum quantity.

∗

Technical Note

Direction of feed

www.rohm.com

© 2011 ROHM Co., Ltd. All rights reserved.

30/30

2011.07 - Rev.B

Notes

No copying or reproduction of this document, in par t or in whole, is permitted without the
consent of ROHM Co.,Ltd.

The content specied herein is subject to change for improvement without notice.

The content specied 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 specications,
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 specied 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 specied 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 specied in this document are intended to be used with general-use electronic
equipment or devices (such as audio visual equipment, ofce-automation equipment, commu­nication devices, electronic appliances and amusement devices).

The Products specied in this document are not designed to be radiation tolerant.

While ROHM always makes effor ts 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, re or any other damage caused in the event of the
failure of any Product, such as derating, redundancy, re 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 injur y (such as a medical
instrument, transportation equipment, aerospace machiner y, nuclear-reactor controller, fuel­controller 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 specied 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.

Notice

www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.

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/

R1120

A