Mulitifunction Backlight LED Driver
for Small LCD Panels (Charge Pump Type)
BD6095GUL,BD6095GU
●Description
BD6095GUL/BD6095GU is “Intelligent LED Driver” that is the most suitable for the cellular phone.
It has many functions that are needed to "the upper side" of the cellular phone.
It has ALC function, that is “Low Power Consumption System” realized.
It has “Contents Adaptive Interface” (External PWM control), that is “Low Power Consumption System” realized.
It adopts the very thin CSP package that is the most suitable for the slim phone.
●Features
1) Total 5LEDs driver for LCD Backlight
It can set maximum 25.6mA /ch by 128steps (Current DAC) for LCD Display.
3LEDs(LED1~LED3) are same controlled.
Another 2LEDs(LED4~5) can be independent controlled. (Enable and Current setting)
2LEDs(LED4~5) can be attributed to “Main Group”.
“Main Group” can be controlled by Auto Luminous Control (ALC) system.
“Main Group” can be controlled by external PWM signal.
2) 1LED driver for Flash/Torch
It can set maximum 120mA for Flash LED Driver.
It has Flash mode and Torch mode, there can be changed by external pin or register.
3) Auto Luminous Control (ALC)
Main backlight can be controlled by ambient brightness.
Photo Diode, Photo Transistor, Photo IC(Linear/Logarithm) can be connected.
Bias source for ambient light sensor, gain and offset adjustment are built in.
LED driver current as ambient level can be customized.
4) 2ch Series Regulator (LDO)
It has selectable output voltage by the register.
LDO1,LDO2 : Iomax=150mA
5) Charge Pump DC/DC for LED driver
It has x1/x1.33/x1.5/x2 mode that will be selected automatically.
Soft start
Over voltage protection (Auto-return type)
Over current protection (Auto-return type)
6) Thermal shutdown (Auto-return type)
7) I2C BUS FS mode (max 400kHz)
8) VCSP50L3 (3.75mm
9) VCSP85H3 (3.75mm
*This chip is not designed to protect itself against radioactive rays.
*This material may be changed on its way to designing.
*This material is not the official specification.
●Absolute Maximum Ratings (Ta=25 oC)
functions
2
, 0.55mmt max) Small and thin CSP package (BD6095GUL)
2
, 1.0mmt max) Small and thin CSP package (BD6095GU)
No.11040EAT31
Parameter Symbol Ratings Unit
Maximum voltage VMAX 7 V
Power Dissipation Pd 1500 mW
Operating Temperature Range Topr -35 ~ +85
Storage Temperature Range Tstg -55 ~ +150
note)Power dissipation deleting is 12.0mW/ oC, when it’s used in over 25 oC. (It’s deleting is on the board that is ROHM’s standard)
1 B5 VBATCP - - GND Power supply for charge pump A
2 F4 VBAT1 - - GND Power supply A
3 E1 VBATLDO - - GND Power supply for LDO A
4 A1 T1 I VBAT GND Test Input Pin (short to Ground) S
5 A6 T2 I VBAT GND Test Input Pin (short to Ground) S
6 F6 T3 O VBAT GND Test Output Pin (Open) M
7 F1 T4 O VBAT GND Test Output Pin (Open) N
8 E6 VIO - VBAT GND Power supply for I/O and Digital C
9 C4 RESETB I VBAT GND Reset input (L: reset, H: reset cancel) H
10 D4 SDA I/O VBAT GND I2C data input / output I
11 D5 SCL I VBAT GND I2C clock input H
12 A3 CPGND - VBAT - Ground B
13 B3 LEDGND - VBAT - Ground B
14 D6 C1N I/O VBAT GND Charge Pump capacitor is connected F
15 C5 C1P I/O - GND Charge Pump capacitor is connected G
16 C6 C2N I/O VBAT GND Charge Pump capacitor is connected F
17 B6 C2P I/O - GND Charge Pump capacitor is connected G
18 A4 C3N I/O VBAT GND Charge Pump capacitor is connected F
19 A5 C3P I/O - GND Charge Pump capacitor is connected G
20 B4 VOUT O - GND Charge Pump output pin A
21 F2 LDO1O O VBAT GND LDO1 output pin Q
22 E2 LDO2O O VBAT GND LDO2 output pin Q
23 D2 LED1 I - GND LED cathode connection 1 E
24 C2 LED2 I - GND LED cathode connection 2 E
25 C1 LED3 I - GND LED cathode connection 3 E
26 B1 LED4 I - GND LED cathode connection 4 E
27 B2 LED5 I - GND LED cathode connection 5 E
28 A2 LEDFL I - GND LED cathode connection for Flash E
29 F5 SBIAS O VBAT GND Bias output for the Ambient Light Sensor Q
30 F3 SSENS I VBAT GND Ambient Light Sensor input N
31 E4 GC1 O VBAT GND Ambient Light Sensor gain control output 1 X
32 E3 GC2 O VBAT GND Ambient Light Sensor gain control output 2 X
33 E5 SGND - VBAT - Ground B
34 D1 WPWMIN I VBAT GND External PWM input for Back Light L
35 D3 FLASHCNT I VBAT GND External enable for Flash L
※The LED terminal that isn't used is to short-circuit to the ground. But, the setup of a register concerned with LED that isn't used is prohibited.
The writing/reading operation is based on the I2C 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.
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.
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.
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.
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.
0Eh W- IU0(6) IU0(5) IU0(4) IU0(3) IU0(2) IU0(1) IU0(0) Main Current at Ambient level 0h
0Fh W- IU1(6) IU1(5) IU1(4) IU1(3) IU1(2) IU1(1) IU1(0) Main Current at Ambient level 1h
10h W- IU2(6) IU2(5) IU2(4) IU2(3) IU2(2) IU2(1) IU2(0) Main Current at Ambient level 2h
11h W- IU3(6) IU3(5) IU3(4) IU3(3) IU3(2) IU3(1) IU3(0) Main Current at Ambient level 3h
12h W- IU4(6) IU4(5) IU4(4) IU4(3) IU4(2) IU4(1) IU4(0) Main Current at Ambient level 4h
13h W- IU5(6) IU5(5) IU5(4) IU5(3) IU5(2) IU5(1) IU5(0) Main Current at Ambient level 5h
14h W- IU6(6) IU6(5) IU6(4) IU6(3) IU6(2) IU6(1) IU6(0) Main Current at Ambient level 6h
15h W- IU7(6) IU7(5) IU7(4) IU7(3) IU7(2) IU7(1) IU7(0) Main Current at Ambient level 7h
16h W- IU8(6) IU8(5) IU8(4) IU8(3) IU8(2) IU8(1) IU8(0) Main Current at Ambient level 8h
17h W- IU9(6) IU9(5) IU9(4) IU9(3) IU9(2) IU9(1) IU9(0) Main Current at Ambient level 9h
18h W- IUA(6) IUA(5) IUA(4) IUA(3) IUA(2) IUA(1) IUA(0) Main Current at Ambient level Ah
19h W- IUB(6) IUB(5) IUB(4) IUB(3) IUB(2) IUB(1) IUB(0) Main Current at Ambient level Bh
1Ah W- IUC(6) IUC(5) IUC(4) IUC(3) IUC(2) IUC(1) IUC(0) Main Current at Ambient level Ch
1Bh W- IUD(6) IUD(5) IUD(4) IUD(3) IUD(2) IUD(1) IUD(0) Main Current at Ambient level Dh
1Ch W- IUE(6) IUE(5) IUE(4) IUE(3) IUE(2) IUE(1) IUE(0) Main Current at Ambient level Eh
1Dh W- IUF(6) IUF(5) IUF(4) IUF(3) IUF(2) IUF(1) IUF(0) Main Current at Ambient level Fh
Input "0” for "-".
Prohibit to accessing the address that isn’t mentioned.
The time indicated by register explanation is the TYP time made by dividing of the built-in OSC.
02h W FLASHEN TORCHEN SLEDENMLEDEN- - LDO2EN LDO1EN
Initial
Value
00h 0 0 0 0 - - 0 0
Bit [7:6] : FLASHEN, TORCHEN LEDFL Control (Flash ON / Torch ON / OFF)
(At FLASHCNT=L) (At FLASHCNT=H) "FLASHCNT" means external pin.
“00” : LEDFL: OFF, Flash mode ON
“01” : LEDFL: Torch mode ON, Flash mode ON
“10” : LEDFL: Flash mode ON, Flash mode ON
“11” : reserved
For Torch/Flash, refer to “Flash LED Current Setting” (address 05h, 06h)
At FLASHCNT=H, even if RESETB=L, the Flash mode becomes ON, and LED is turned on.
But, the setup of LED current becomes the minimum setting in this case.
(Because the setting of LED current is reset at the time of RESETB=L.)
Refer to “The explanation of LED Driver” for detail.
Bit5 : SLEDEN Sub Group LED Control (ON/OFF)
“0” : “Sub Group” LED OFF
“1” : “Sub Group” LED ON
Bit4 : MLEDEN Main Group LED Control (ON/OFF)
“0” : “Main Group” LED OFF
“1” : “Main Group” LED ON
03h W - IMLED(6) IMLED(5)IMLED(4)IMLED(3) IMLED(2) IMLED(1) IMLED(0)
Initial
Value
00h - 0 0 0 0 0 0 0
Bit7 : (Not used)
Bit [6:0] : IMLED(6:0) Main Group LED Current Setting at non-ALC mode
“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
04h W - ISLED(6) ISLED(5)ISLED(4)ISLED(3) ISLED(2) ISLED(1) ISLED(0)
Initial
Value
00h - 0 0 0 0 0 0 0
Bit7 : (Not used)
Bit [6:0] : ISLED(6:0) Sub Group LED Current Setting
“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
05h W - - - IFTLED(4) IFTLED(3) IFTLED(2) IFTLED(1) IFTLED(0)
Initial
Value
Bit [7:5] : (Not used)
Bit [4:0] : IFTLED(4:0) “Torch mode” of LEDFL Current Setting
00h - - - 0 0 0 0 0
“00000” : 3.75 mA (Initial value)
“00001” : 7.50 mA
“00010” : 11.25 mA
“00011” : 15.00 mA
“00100” : 18.75 mA
“00101” : 22.50 mA
“00110” : 26.25 mA
“00111” : 30.00 mA
“01000” : 33.75 mA
“01001” : 37.50 mA
“01010” : 41.25 mA
“01011” : 45.00 mA
“01100” : 48.75 mA
“01101” : 52.50 mA
“01110” : 56.25 mA
“01111” : 60.00 mA
“10000” : 63.75 mA
“10001” : 67.50 mA
“10010” : 71.25 mA
“10011” : 75.00 mA
“10100” : 78.75 mA
“10101” : 82.50 mA
“10110” : 86.25 mA
“10111” : 90.00 mA
“11000” : 93.75 mA
“11001” : 97.50 mA
“11010” : 101.25 mA
“11011” : 105.00 mA
“11100” : 108.75 mA
“11101” : 112.50 mA
“11110” : 116.25 m A
“11111” : 120.00 mA
* LED Current : 120 x 1/32 mA Step ( =3.75 mA Step)
06h W - - - IFFLED(4) IFFLED(3) IFFLED(2) IFFLED(1) IFFLED(0)
Initial
Value
Bit [7:5] : (Not used)
Bit [4:0] : IFFLED(4:0) “Flash mode” of LEDFL Current Setting
00h - - - 0 0 0 0 0
“00000” : 3.75 mA (Initial value)
“00001” : 7.50 mA
“00010” : 11.25 mA
“00011” : 15.00 mA
“00100” : 18.75 mA
“00101” : 22.50 mA
“00110” : 26.25 mA
“00111” : 30.00 mA
“01000” : 33.75 mA
“01001” : 37.50 mA
“01010” : 41.25 mA
“01011” : 45.00 mA
“01100” : 48.75 mA
“01101” : 52.50 mA
“01110” : 56.25 mA
“01111” : 60.00 mA
“10000” : 63.75 mA
“10001” : 67.50 mA
“10010” : 71.25 mA
“10011” : 75.00 mA
“10100” : 78.75 mA
“10101” : 82.50 mA
“10110” : 86.25 mA
“10111” : 90.00 mA
“11000” : 93.75 mA
“11001” : 97.50 mA
“11010” : 101.25 mA
“11011” : 105.00 mA
“11100” : 108.75 mA
“11101” : 112.50 mA
“11110” : 116.25 m A
“11111” : 120.00 mA
* LED Current : 120 x 1/32 mA Step ( =3.75 mA Step)
Bit [7:4] : LDO2VSEL(3:0) LDO2 Output Voltage Control
“0000” : 1.20 V
“0001” : 1.30 V
“0010” : 1.50 V
“0011” : 1.60 V
“0100” : 1.80 V
“0101” : 2.20 V
“0110” : 2.40 V
“0111” : 2.50 V (Initial value)
“1000” : 2.60 V
“1001” : 2.70 V
“1010” : 2.80 V
“1011” : 2.90 V
“1100” : 3.00 V
“1101” : 3.10 V
“1110” : 3.20 V
“1111” : 3. 3 0 V
Bit [3:0] : LDO1VSEL(3:0) LDO1 Output Voltage Control
“0000” : 1.20 V
“0001” : 1.30 V
“0010” : 1.50 V
“0011” : 1.60 V
“0100” : 1.80 V (Initial value)
“0101” : 2.20 V
“0110” : 2.40 V
“0111” : 2.50 V
“1000” : 2.60 V
“1001” : 2.70 V
“1010” : 2.80 V
“1011” : 2.90 V
“1100” : 3.00 V
“1101” : 3.10 V
“1110” : 3.20 V
“1111” : 3. 3 0 V
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) Main LED current Down transition per 0.2mA step
Setting time is counted based on the switching frequency of Charge Pump.
Bit [3:0] : TLH(3:0) Main LED current Up transition per 0.2mA step
Setting time is counted based on the switching frequency of Charge Pump.
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 m s
The above value becomes the value of the Typ (1MHz) time.
Refer to “(9) Slope Process” of “The explanation of ALC” 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 m s
The above value becomes the value of the Typ (1MHz) time.
Refer to “(9) Slope Process” of “The explanation of ALC” for detail.
0Ch W SOFS(3) SOFS(2) SOFS(1) SOFS(0)SGAIN(3) SGAIN(2)SGAIN(1) SGAIN(0)
Initial
Value
Bit [7:4] : SOFS(3:0) AD Data Offset Adjustment
Offset adjust is performed to ADC data.
Refer to “(5) ADC data Gain/offset adjustment” of “The explanation of ALC” for detail.
Bit [3:0] : SGAIN(3:0) AD Data Gain Adjustment
Gain adjust is performed to ADC data.
The data after adjustment are round off by 8-bit data.
Refer to “(5) ADC data Gain/offset adjustment” of “The explanation of ALC” for detail.
0Eh~1Dh W - IU*(6) IU*(5) IU*(4) IU*(3) IU*(2) IU*(1) IU*(0)
Initial
Value
-
Refer to after page for initial table.
“*” means 0~F.
Bit7 : (Not used)
Bit [6:0] : IU*(6:0) Main Current at Ambient Level for 0h~Fh
“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
1. The explanation of Reset
There are two kinds of reset, software reset and hardware reset.
●Software reset
・All the registers are initialized by SFTRST="1".
・SFTRST is an automatically returned to "0". (Auto Return 0).
●Hardware reset
・It shifts to hardware reset by changing RESETB pin “H” → “L”.
・The condition of all the registers under hardware reset pin is returned to the initial value, and it stops accepting all address.
・It’s possible to release from a state of hardware reset by changing RESETB pin “L” → “H”.
・RESETB pin has delay circuit. It doesn’t recognize as hardware reset in “L” period under 5μs.
・Even if RESETB=L, at FLASHCNT=H, Flash mode becomes ON by minimum setting.
●Reset Sequence
・When hardware reset was done during software reset, software reset is canceled whenhardware reset is canceled.
(Because the initial value of software reset is “0”)
2. The explanation of Thermal shutdown
The blocks which thermal shutdown function is effective in the following.
Charge pump
LED Driver
LDO1, LDO2, SBIAS
A thermal shutdown function works in about 190
Detection temperature has a hysteresis, and detection release temperature is about 170
3. The explanation of Charge Pump for LED driver
Charge Pump block is designed for the power supply for LED driver.
It has the x1.0/x1.33/x1.5/x2.0 mode. It changes to the most suitable mode automatically by Vf of LED and the battery
voltage. It has the mode of x1.33 and it can be higher efficiency than traditional.
●Start
Charge Pump circuit operates when any LED turns ON.
●Soft start
When the start of the Charge Pump circuit is done, it has the soft start function to prevent a rush current.
BAT
IO
RESETB
EN (*1)
T
VBATON
T
VIOON=min 0.1ms
T
RSTB=min 0.1ms
o
C.
Technical Note
o
C.(Design reference value)
T
VBATOFF
T
VIOOFF=min 1ms
T
RST=min 0ms
T
SOFT
VOUT
LED Current
(*1) An EN signal in the upper figure means the following;
But if Ta >TSD, EN Signal doesn’t become effective.
27/41
2011.04 - Rev.
A
BD6095GUL,BD6095GU
●Charge Pump Mode transition
The transition of boost multiple transits automatically by Vf of LED and the battery voltage.
BD6095GUL/BD6095GU changes the four charge pump movement mode automatically to realize low consumption power.
< Mode Up >
A LED terminal voltage is monitored, and the movement mode is changed to ×1→×1.33, ×1.33→×1.5 and ×1.5→×2
automatically when a LED terminal voltage is lower than 0.2V (typ).
At this time, the maximum output voltage of the charge pump is restricted to 5.1V (typ).
< Mode Down >
The rise in the battery voltage, the off control of LED lighting, “Main Group” LED current value and the data writing to
the address 04h,05h,06h (LED Current Setting) is monitored, and the movement mode is changed to
×2→×1.5→×1.33→×1 automatically.
This mode down movement lasts until a mode up movement happens.
At Flash mode and Torch mode, the mode down doesn't happen.
The thresholds of rise in a battery voltage are 2.9V, 3.3V, 3.7V and 4.1V (typ).
And, as for the off control of LED lighting, it is shown that MLEDEN, SLEDEN, TORCHEN, FLASHEN and
FLASHCNT transited in “1” →“0”.
●Over Voltage protection / Over Current protection
Charge Pump circuit output (VOUT) is equipped with the over-voltage protection and the over current protection
function. A VOUT over-voltage detection voltage is about 5.5V(typ). (VOUT at the time of rise in a voltage)
A detection voltage has a hysteresis, and a detection release voltage is about 5.1V(typ).
And, when VOUT output short to ground, input current of the battery terminal is limited by an over current protection
function.
LED1~LED3 are same controlled. These are using for “Main backlight” and we call it “Main Group”.
Current setting: IMLED(6:0)
ON/OFF: MLEDEN (ON=1, OFF=0)
●LED4~LED5
LED4 and LED5 can be independent controlled. There are attributed to “Main Group” or “Sub Group”.
If these are attributed to “Main Group”, these are controlled by same as LED1~LED3.
<Independent Control>
Current setting: ISLED(6:0)
ON/OFF: SLEDEN (ON=1, OFF=0)
<Attribute to “Main Group”>
Current setting: IMLED(6:0)
ON/OFF: MLEDEN (ON=1, OFF=0)
●The number of LED Lighting (LED1~LED5)
The number of lighting for Main/Sub LED can be set up grouping by the register
The setting of the number of lighting is as the following.
The Main/Sub LED is independently controlled by register MLEDEN, SLEDEN.
The change of the Grouping setting with turning it on is prohibited.
The LED terminal that isn’t used must be connected to the ground.
●LEDFL
LEDFL is for Flash. It has the two mode, “Torch” and “Flash”.
Torch mode current: IFTLED(4:0)
Flash mode current: IFFLED(4:0)
ON/OFF: TORCHEN, FLASHEN, FLASHCNT (refer to “Power Control” address 02h)
Flash mode is started by the rise edge of FLASHEN or FLASHCNT.
At FLASHCNT=H, even if RESETB=L, the Flash mode becomes ON, and LED is turned on.
(But, the setup of LED current becomes the minimum setting in this case because current setting is reset.)
Please set FLASHCNT=L when you don't turn on Flash.
5. The explanation of ALC (Auto Luminous Control)
LCD backlight current adjustment is possible in the basis of the data detected by external ambient light sensor.
• Extensive selection of the ambient light sensors (Photo Diode, Photo Transistor, Photo IC(linear/logarithm)) is
possible by building adjustment feature of Sensor bias, gain adjustment and offset adjustment.
• Ambient data 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
SSENS
SBIAS
ADC
Offset Correction
Gain Correction
Data
Correction
Sensor type
Logarithmic Conv.
Ambient Level detect
Average
Conversion
Tab l e
Current
Conversion
Mode Sel ect
PWM enabling
Slope Timer
Slope
process
WPWMIN
Technical Note
2
C I/F.
LED*
LCD
BackLight
GC1
GC2
Gain
Control
Sensor Gain Control
Ambient Level
Sensor I/F 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.
・ Refer to under about the associate ALC mode and Main LED current.
ALCEN MLEDEN MLEDMD Sensor I/F LED controlMode Main LED current
0 0 x
0 1 0
0 1 1 IU0(6:0) (*1)
1 0 x
1 1 0
1 1 1 ALC mode (*2)
(*1) At this mode, because Sensor I/F is OFF, AMB(3:0)=0h.
So, Main LED current is selected IU0(6:0).
(*2) At this mode, Main LED current is selected IU0(6:0)~IUF(6:0)
It becomes current value corresponding to each brightness.
・ 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.
Example 1 (Use BH1600FVC)Example 2 Example 3
SBIAS
VCC
Application
example
BH1600
GND
Operating mode Auto
IOUT
GC1
GC2
SSENS
GC1
GC2
SGND
Manual
High Low High Low
Resister values are relative
Auto
GAIN(1:0) setting 00 01 10 00 01 10 11
Gain status High Low High Low High LowHigh 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.
・ 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
DC Cycle
DCYC(1:0 )
16 times
SBIAS Output
DC Movement
GC1, GC2
MB(3:0)
wait= 64ms(typ)
T
oprt= 80.4ms(typ)
T
(Operate time)
(Wait time)
AD= 16.4ms(typ)
T
(A/D conve rsion time)
MB(3:0)
When SBIASON=1
AD start signal
GC1, GC2=00
TADone= 1.024ms(typ)
16 times measurem ent
(5) ADC data Gain / offset adjustment
・ To correct the characteristic dispersion of the sensor,
Gain and offset adjustment to ADC output data is possible.
・ LED current can be assigned as each of 16 steps of the ambient level.
・ Setting of a user can do by overwriting, though it prepares for the
table setup in advance.
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
(9) 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)
・ Main LED current changes as follows at the time as the slope.
TLH (THL) is setup of time of the current step 2/256.
it can select the way to sloping.
Register : MDCIR
NonALC
mode
IMLED(6:0)IMLED(6:0)
“0” : LED current non-reset when mode change
“1” : LED current reset when mode change
Main LED current
MDCIR= “0”
0m
NonALC
mode
IMLED(6:0)IMLED(6:0)
Main LED current
0m
MDCIR= “1”
(11) Current adjustment
・ When it is permitted by the register setting, PWM drive by the external terminal (WPWMIN) is possible.
Register : WPWMEN
・ It is suitable for the intensity correction by external control,
because PWM based on Main 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)
Back light current
PWM input invalid
PWM input valid
Current ON is depending on “MLEDEN”.
MLEDEN
Inte rna l S o ft-S tar t Tim e
DC/DC Output
W P W M IN in p u t
WPWMEN
LED Current
It ca n b e inp utte d W P W M IN b ef or e M L E D EN =1 .
It ca n b e se t W PW M E N =1 b ef or e M L E D EN =1 .
P W M m ove m en t is effe ctive at th e tim e L E D cu rre n t ris e u p.
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.
Technical Note
(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) LDO
Use each output of LDO by the independence. Don’t use under the condition that each output is short-circuited because it
has the possibility that an operation becomes unstable.
(11) 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.
(12) 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.
(13) 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.
No copying or reproduction of this document, in par t or in whole, is permitted without the
consent of ROHM Co.,Ltd.
The content specied herein is subject to change for improvement without notice.
The content specied 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 specications,
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 specied 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 specied 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
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