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) 2 5) I C 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 7 V except for VLED VOUT, SW Maximum voltage 2 VMAX2 15 V VLED Maximum voltage 3 VMAX3 40 V VOUT, SW Pd 1250 *1 mW Power Dissipation 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 VBAT input voltage VIO pin voltage www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. Symbol Ratings Unit VBAT 2.7~5.5 V VIO 1.65~3.3 V 1/30 2011.07 - Rev.B BD60910GU Technical Note ●Electrical Characteristics (Unless otherwise specified, Ta=25°C, VBAT=3.6V, VIO=1.8V) Limits Parameter Symbol Unit Min. Typ. Max. Condition 【Circuit Current】 VBAT Circuit current 1 IBAT1 - 0.1 1.0 μA RESETB=0V, VIO=0V VBAT Circuit current 2 IBAT2 - 0.5 3.0 μA RESETB=0V, VIO=1.8V VBAT Circuit current 3 IBAT3 - 3.5 5.0 mA VBAT Circuit current 4 IBAT4 - 0.4 1.0 mA LED=ON, ILED=15mA setting Vo=24V Only ALC block ON ADCYC=0.52s setting Except sensor current 【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 Vfb - 0.3 - V Over current protection OCP - 650 - mA Oscillator frequency fosc 0.8 1.0 1.2 MHz Over Voltage Protection detect voltage OVP1 OVP2 OVP3 OVP4 OVP5 30 - 31 27 24 21 18 32 - V V V V V Maximum Duty Mduty 92.5 - - % VOUT open protection OVO - 0.7 1.4 V ILED=15mA setting 【DC/DC】 VLED pin feedback voltage ●Electrical Characteristics (Unless otherwise specified, Ta=25°C, VBAT=3.6V, VIO=1.8V) Limits Parameter Symbol Unit Min. Typ. Max. Condition 【I2C Input (SDA, SCL)】 LOW level input voltage VIL -0.3 - 0.25 × VIO V HIGH level input voltage VIH 0.75 × VIO - VBAT +0.3 V Hysteresis of Schmitt trigger input Vhys 0.05 × VIO - - V LOW level output voltage (SDA) at 3mA sink current VOL 0 - 0.3 V Input current each I/O pin lin -3 - 3 μA LOW level input voltage VIL -0.3 - 0.25 × VIO V HIGH level input voltage VIH 0.75 × VIO - VBAT +0.3 V Input current each I/O pin Iin -3 - 3 μA Input voltage = 0.1×VIO~0.9×VIO 【RESETB】 www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 2/30 Input voltage = 0.1×VIO~0.9×VIO 2011.07 - Rev.B BD60910GU Technical Note ●Electrical Characteristics (Unless otherwise specified, Ta=25°C, VBAT=3.6V, VIO=1.8V) Limits Parameter Symbol Unit Min. Typ. Max. Condition 【ALC】 SBIAS Output voltage VoS 2.850 2.470 3.0 2.6 3.150 2.730 V V SBIAS Output current IoS - - 30 mA VISS 0 - VoS x 255/256 V SBIAS Discharge resister at OFF ROFFS - 1.0 1.5 kΩ ADC resolution ADRES ADC non-linearity error ADINL -3 - +3 LSB ADC differential non-linearity error ADDNL -1 - +1 LSB RSSENS 1 - - MΩ L level input voltage VILA -0.3 - 0.3 V H level input voltage VIHA 1.4 - VBAT +0.3 V IinA - 3.6 10 μA PWpwm 50 - - μs L level output voltage VOLS - - 0.2 V IOL=1mA H level output voltage VOHS VoS -0.2 - - V IOH=1mA SSENS Input range SSENS Input impedance 8 Io=200μA <Initial value> Io=200μA Vo=3.0V bit 【WPWMIN】 Input current PWM input minimum High pulse width Vin=1.8V 【GC1, GC2】 www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 3/30 2011.07 - Rev.B BD60910GU Technical Note ●Block Diagram / Application Circuit example VBAT RB520S-40 VOUT SW GNDP GNDPS 1μF(50V) 22μH VBAT1 VBAT2 OCP 10µF DC/DC VIO OVP ( )( )( ) RESETB SCL SDA I/O 2 Level I C interface Shift Digital Control Feed Back VLED External WPWMIN PWM LEDGND SBIAS Photo IC TSD VDD GC1 GND GC2 IOUT GND1 * SSENS 5.6kΩ BH1600FVC 1μF Sensor I/F VREF IREF ALC GND2 SGND GC2 T4 T3 (Open) T2 (Open) * The example when using BH1600FVC and assuming brightness range 10(lx)-50000(lx) by the panel of 20% transmissivity T1 GC1 Fig.1 Block Diagram / Application Circuit example www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 4/30 2011.07 - Rev.B BD60910GU Technical Note ●Pin Arrangement [Bottom View］ E T4 GND2 D VIO SCL C GND1 SDA B WPWMIN A T1 GNDP SW RESETB GNDPS T3 VBAT2 VOUT GC2 SGND GC1 SBIAS SSENS VLED T2 4 5 index VBAT1 LEDGND 1 2 3 Fig.2 Pin Arrangement ●Pin Functions No Ball No. Pin Name I/O ESD Diode For Power For Ground Functions Equivalent Circuit 1 A2 VBAT1 - - GND Power supply 2 D5 VBAT2 - - GND Power supply A 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 www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 5/30 2011.07 - Rev.B BD60910GU Technical Note ●Equivalent Circuit A H N B VBAT VBAT C VBAT E VIO I VBAT VIO L VBAT VBAT M VBAT Q VBAT VBAT S VBAT VBAT X www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 6/30 VBAT VoS VBAT 2011.07 - Rev.B BD60910GU Technical Note ●I2C BUS format 2 The writing/reading operation is based on the I C 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： SDA It can change Data are effective ・ 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 SCL S 1 2 9 clock pulse for acknowledgement START condition www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 8 7/30 2011.07 - Rev.B 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 S X X X X X X X 0 A A7 A6 A5 A4 A3 A2 A1 A0 A D7 D6 D5 D4 D3 D2 D1 D0 A slave address register address *1 D7 D6 D5 D4 D3 D2 D1 D0 A P DATA DATA register address increment R/W=0(write) register address increment A=acknowledge(SDA LOW) A=not acknowledge(SDA HIGH) S=START condition P=STOP condition *1: Write Timing from master to slave from slave to master ・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 X X X X X X X 1 A D7 D6 D5 D4 D3 D2 D1 D0 A slave address D7 D6 D5 D4 D3 D2 D1 D0 A P DATA DATA register address increment R/W=1(read) register address increment A=acknowledge(SDA LOW) A=not acknowledge(SDA HIGH) S=START condition P=STOP condition from master to slave from slave to master ・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 X X X X X X X 0 A A7 A6 A5 A4 A3 A2 A1 A0 A Sr X X X X X X X 1 A slave address register address slave address R/W=0(write) R/W=1(read) D7 D6 D5 D4 D3D2 D1D0 A DATA D7D6 D5D4D3D2D1D0 A P 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. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 8/30 2011.07 - Rev.B BD60910GU Technical Note ●Timing diagram SDA t BUF t SU;DAT t LOW t HD;STA SCL t HD;STA S t SU;STO t SU;STA t HD;DAT Sr t HIGH P S ●Electrical Characteristics(Unless otherwise specified, Ta=25 ℃, VBAT=3.6V, VIO=1.8V) Parameter Symbol Standard-mode Fast-mode Min. Typ. Max. Min. Typ. Max. Unit 【I2C BUS format】 SCL clock frequency fSCL 0 - 100 0 - 400 kHz LOW period of the SCL clock tLOW 4.7 - - 1.3 - - μs HIGH period of the SCL clock tHIGH 4.0 - - 0.6 - - μs Hold time (repeated) START condition After this period, the first clock is generated tHD;STA 4.0 - - 0.6 - - μs Set-up time for a repeated START condition tSU;STA 4.7 - - 0.6 - - μs Data hold time tHD;DAT 0 - 3.45 0 - 0.9 μs Data set-up time tSU;DAT 250 - - 100 - - ns Set-up time for STOP condition tSU;STO 4.0 - - 0.6 - - μs Bus free time between a STOP and START condition tBUF 4.7 - - 1.3 - - μs www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 9/30 2011.07 - Rev.B BD60910GU Technical Note ●Register List Input "0” for "-". Register data Address W/R Function D7 D6 D5 D4 D3 D2 D1 D0 00h W - - - - - - - SFTRST Software Reset 01h R/W - VOVP(2) VOVP(1) VOVP(0) WPWMEN ALCEN LEDMD LEDEN LED, ALC, OVP Control 02h - - - - - - - - - LED Current Setting at non-ALC mode 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) 09h - - - - - - - - - - 0Ah - - - - - - - - - - 0Bh R/W ADCYC(1) ADCYC(0) GAIN(1) GAIN(0) STYPE VSB MDCIR SBIASON 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 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 LED Current transition ALC mode setting - 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 Technical Note ●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 : Address 01h SFTRST Software Reset Command “0” : Reset cancel “1” : Reset (All register initializing) Refer to “Explanation 1” for detail. < 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 00h - 0 0 0 0 0 0 0 Bit7 : (Not used) Bit [6:4] : VOVP(2:0) Over Voltage Protection detect voltage “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 Refer to “Explanation 4” for detail. Bit3 : WPWMEN External PWM Input “WPWMIN” terminal Enable Control (Valid/Invalid) “0” : WPWMIN input invalid “1” : WPWMIN input valid Refer to “Explanation 5-(10)” for detail. Bit2 : ALCEN ALC Function Control (ON/OFF) “0” : ALC function OFF “1” : ALC function ON Refer to “Explanation 5-(1)” for detail. Bit1 : LEDMD LED Mode Select (ALC mode/Register mode) “0” : Register mode “1” : ALC mode Refer to “Explanation 5-(1)” for detail. Bit0 : LEDEN LED Control (ON/OFF) “0” : LED OFF “1” : LED ON Refer to “Explanation 5-(1)” for detail. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 11/30 2011.07 - Rev.B BD60910GU Address 03h Technical Note < 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 00h - 0 0 0 0 0 0 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” : www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 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” : “1000001” : “1000010” : “1000011” : “1000100” : “1000101” : “1000110” : “1000111” : “1001000” : “1001001” : “1001010” : “1001011” : “1001100” : “1001101” : “1001110” : “1001111” : “1010000” : “1010001” : “1010010” : “1010011” : “1010100” : “1010101” : “1010110” : “1010111” : “1011000” : “1011001” : “1011010” : “1011011” : “1011100” : “1011101” : “1011110” : “1011111” : “1100000” : “1100001” : “1100010” : “1100011” : “1100100” : “1100101” : “1100110” : “1100111” : “1101000” : “1101001” : “1101010” : “1101011” : “1101100” : “1101101” : “1101110” : “1101111” : “1110000” : “1110001” : “1110010” : “1110011” : “1110100” : “1110101” : “1110110” : “1110111” : “1111000” : “1111001” : “1111010” : “1111011” : “1111100” : “1111101” : “1111110” : “1111111” : 12/30 13.0 mA 13.2 mA 13.4 mA 13.6 mA 13.8 mA 14.0 mA 14.2 mA 14.4 mA 14.6 mA 14.8 mA 15.0 mA 15.2 mA 15.4 mA 15.6 mA 15.8 mA 16.0 mA 16.2 mA 16.4 mA 16.6 mA 16.8 mA 17.0 mA 17.2 mA 17.4 mA 17.6 mA 17.8 mA 18.0 mA 18.2 mA 18.4 mA 18.6 mA 18.8 mA 19.0 mA 19.2 mA 19.4 mA 19.6 mA 19.8 mA 20.0 mA 20.2 mA 20.4 mA 20.6 mA 20.8 mA 21.0 mA 21.2 mA 21.4 mA 21.6 mA 21.8 mA 22.0 mA 22.2 mA 22.4 mA 22.6 mA 22.8 mA 23.0 mA 23.2 mA 23.4 mA 23.6 mA 23.8 mA 24.0 mA 24.2 mA 24.4 mA 24.6 mA 24.8 mA 25.0 mA 25.2 mA 25.4 mA 25.6 mA 2011.07 - Rev.B BD60910GU Address 08h Technical Note < 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 C7h 1 1 0 0 0 1 1 1 Bit [7:4] : THL(3:0) “0000” : “0001” : “0010” : “0011” : “0100” : “0101” : “0110” : “0111” : “1000” : “1001” : “1010” : “1011” : “1100” : “1101” : “1110” : “1111” : 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 327.7 ms (Initial value) 393.2 ms 458.8 ms 524.3 ms Refer to “Explanation 5-(8)” for detail. Bit [3:0] : TLH(3:0) “0000” : “0001” : “0010” : “0011” : “0100” : “0101” : “0110” : “0111” : “1000” : “1001” : “1010” : “1011” : “1100” : “1101” : “1110” : “1111” : LED current Up 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 (Initial value) 65.54 ms 131.1 ms 196.6 ms 262.1 ms 327.7 ms 393.2 ms 458.8 ms 524.3 ms Refer to “Explanation 5-(8)” for detail. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 13/30 2011.07 - Rev.B BD60910GU Address 0Bh Technical Note < ALC mode setting > Address R/W 0Bh R/W Initial Value 81h Bit7 Bit6 ADCYC(1) ADCYC(0) 1 0 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 GAIN(1) GAIN(0) STYPE VSB MDCIR SBIASON 0 0 0 0 0 1 Bit [7:6] : ADCYC(1:0) ADC Measurement Cycle “00” : 0.52 s “01” : 1.05 s “10” : 1.57 s (Initial value) “11” : 2.10 s Refer to “Explanation 5-(4)” for detail. Bit [5:4] : GAIN(1:0) Sensor Gain Switching Function Control “00” : Auto Change (Initial value) “01” : Manual High “10” : Manual Low “11” : Fixed Refer to “Explanation 5-(3),5-(6)” for detail. Bit3 : STYPE Ambient Light Sensor Type Select (Linear/Logarithm) “0” : For Linear Sensor (Initial value) “1” : For Log Sensor Refer to “Explanation 5-(6)” for detail. Bit2 : VSB SBIAS Output Voltage Control “0” : SBIAS output voltage 3.0V “1” : SBIAS output voltage 2.6V Refer to “Explanation 5-(2)” for detail. (Initial value) Bit1 : MDCIR LED Current Reset Select by Mode Change “0” : LED current non-reset at mode change (Initial value) “1” : LED current reset at mode change Refer to “Explanation 5-(9)” for detail. Bit0 : SBIASON SBIAS Control (ON/OFF) “0” : Measurement cycle synchronous “1” : Usually ON (at ALCEN=1) (Initial value) Refer to “Explanation 5-(4)” for detail. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 14/30 2011.07 - Rev.B BD60910GU Address 0Dh Technical Note < 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) “0000” : “0001” : “0010” : “0011” : “0100” : “0101” : “0110” : “0111” : “1000” : “1001” : “1010” : “1011” : “1100” : “1101” : “1110” : “1111” : Ambient Level 0h 1h 2h 3h 4h 5h 6h 7h 8h 9h Ah Bh Ch Dh Eh Fh 2 The data can be read through I C. Refer to “Explanation 5-(6)” for detail. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 15/30 2011.07 - Rev.B BD60910GU Technical Note Address 0Eh~1Dh < LED Current at Ambient level 0h~Fh > Address R/W Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 0Eh~1Dh W - 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” : www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 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” : “1000001” : “1000010” : “1000011” : “1000100” : “1000101” : “1000110” : “1000111” : “1001000” : “1001001” : “1001010” : “1001011” : “1001100” : “1001101” : “1001110” : “1001111” : “1010000” : “1010001” : “1010010” : “1010011” : “1010100” : “1010101” : “1010110” : “1010111” : “1011000” : “1011001” : “1011010” : “1011011” : “1011100” : “1011101” : “1011110” : “1011111” : “1100000” : “1100001” : “1100010” : “1100011” : “1100100” : “1100101” : “1100110” : “1100111” : “1101000” : “1101001” : “1101010” : “1101011” : “1101100” : “1101101” : “1101110” : “1101111” : “1110000” : “1110001” : “1110010” : “1110011” : “1110100” : “1110101” : “1110110” : “1110111” : “1111000” : “1111001” : “1111010” : “1111011” : “1111100” : “1111101” : “1111110” : “1111111” : 16/30 13.0 mA 13.2 mA 13.4 mA 13.6 mA 13.8 mA 14.0 mA 14.2 mA 14.4 mA 14.6 mA 14.8 mA 15.0 mA 15.2 mA 15.4 mA 15.6 mA 15.8 mA 16.0 mA 16.2 mA 16.4 mA 16.6 mA 16.8 mA 17.0 mA 17.2 mA 17.4 mA 17.6 mA 17.8 mA 18.0 mA 18.2 mA 18.4 mA 18.6 mA 18.8 mA 19.0 mA 19.2 mA 19.4 mA 19.6 mA 19.8 mA 20.0 mA 20.2 mA 20.4 mA 20.6 mA 20.8 mA 21.0 mA 21.2 mA 21.4 mA 21.6 mA 21.8 mA 22.0 mA 22.2 mA 22.4 mA 22.6 mA 22.8 mA 23.0 mA 23.2 mA 23.4 mA 23.6 mA 23.8 mA 24.0 mA 24.2 mA 24.4 mA 24.6 mA 24.8 mA 25.0 mA 25.2 mA 25.4 mA 25.6 mA 2011.07 - Rev.B 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 ROHM Co., Ltd. All rights reserved. 17/30 2011.07 - Rev.B 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 VIO RESETB T VBATOFF T VIOON=m in 0.1 m s T VIOOFF=m in １ m s T RSTB=min 0.1 m s T RST=m in 0 ms LEDEN Soft start VOUT LED Current www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 18/30 2011.07 - Rev.B 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 ROHM Co., Ltd. All rights reserved. 19/30 2011.07 - Rev.B 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 SBIAS Conversion Table SSENS GC1 GC2 ADC Data Correction LED* Mode Select LIN/LOG Sensor Slope Timer Average Current Logarithmic Conv. Conversion Ambient Level detect LCD BackLight Slope process Main Group LED Driver Gain Control Sensor Gain Control Main current setting 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 Mode LED current 0 0 ＊ OFF OFF OFF OFF 0 1 0 ILED(6:0) Resister ( AMB(3:0)=0h ) ON mode 0 1 1 IU0(6:0) (*1) 1 0 ＊ OFF OFF ON ALC mode 1 1 0 ILED(6:0) 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. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 20/30 2011.07 - Rev.B BD60910GU (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 Sensor Current (Iout) Technical Note Ambient SBIAS VSSENS VCC Sensor IC A/D Iout IOUT SSENS GND Rs SGND 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) SBIAS SSENS voltage Rs is large Rs is small Ambient SSENS Voltage = Iout x Rs www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 21/30 2011.07 - Rev.B BD60910GU (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. SSENS Voltage Technical Note High Gain mode Low Gain mode SSENS Voltage Ambient Auto Gain mode Ambient Example 1 (Use BH1600FVC) SBIAS SBIAS SSENS SSENS SSENS BH1600 GND １ Application example Example 3 SBIAS 9.5 (*1) VCC IOUT Example 2 GC1 GC1 GC1 GC1 GC2 GC2 GC2 GC2 SGND SGND SGND Resister values are relative Operating mode Auto GAIN(1:0) setting Gain status GC1 output GC2 output 00 High Low L L Manual High Low 01 10 High Low L L Auto 00 High Low L L Manual High Low 01 10 High Low L L Fixed 11 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 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 Twait= 64ms(typ) (Wait time) When SBIASON=1 ADC Movement TAD= 16.4ms(typ) AD start signal (A/D conversion time) GC1, GC2 GC1, GC2=00 TADone= 1.024ms(typ) AMB(3:0) AMB(3:0) 16 times measurement Toprt= 80.4ms(typ) (Operate time) www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 23/30 2011.07 - Rev.B 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 GAIN(1:0) Gain Status Ambient level 00 Auto Low 10 01 11 XX Manual Low Manual High Fixed Fixed SSENS voltage 0h VoS×0／256 VoS×0／256 VoS×0／256 1h VoS×1／256 VoS×1／256 VoS×1／256 VoS×2／256 VoS×2／256 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 2h This area is not assigned. 3h 4h 5h VoS×0／256 6h VoS×1／256 7h 8h 9h Ah Bh Ch Dh Eh Fh Auto High 1 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×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 This area is not assigned. 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 In the Auto Gain control mode, sensor gain changes in gray-colored ambient level. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 24/30 2011.07 - Rev.B BD60910GU (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) LED Current Technical Note Conversion table can be changed Ambient Level Conversion Table (initial value) Ambient Level Setting data Current value Ambient Level 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 63h 63h 63h 63h 14.6mA 17.4mA 19.2mA 20.0mA 20.0mA 20.0mA 20.0mA 20.0mA LED setting data LED Current LED current (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. THL (3:0) TLH(3:0) Up/Down transition ed is set individually TLH spe time Zoom THL LED Current 25.6mA =0.1mA 256 TLH(3:0) time www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 25/30 2011.07 - Rev.B BD60910GU Technical Note (9) LED current reset when mode change ・ Selectable the way to sloping at mode change. (ALC↔Resister) Register : MDCIR “0” : LED current non-reset at mode change “1” : LED current reset at mode change Resister mode Resister mode ALC mode LED current ILED(6:0) ILED(6:0) IU*(6:0) MDCIR= “0” 0mA time Resister mode ALC mode Resister mode ILED(6:0) LED current 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. 0 WPWMIN (External input) L ON 0 H ON 1 1 L H Forced OFF ON WPWMEN LED current PWM input invalid PWM input valid LED EN S o ft s ta rt VO UT W P W M IN W PW M EN L E D C u rre n t 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 ROHM Co., Ltd. All rights reserved. 26/30 2011.07 - Rev.B 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 ROHM Co., Ltd. All rights reserved. 27/30 2011.07 - Rev.B 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 ROHM Co., Ltd. All rights reserved. 28/30 2011.07 - Rev.B BD60910GU Technical Note ●Power dissipation (On the ROHM’s Power dissipation measuring board) 1.6 Power Dissipation Pd （W) 1.4 1250mW 1.2 1.0 0.8 0.6 0.4 0.2 0.0 0 www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 25 50 75 Ta（℃） 29/30 100 125 150 2011.07 - Rev.B BD60910GU Technical Note ●Ordering part number B D 6 Part No. 0 9 1 0 G Part No. U - Package GU: VCSP85H3 E 2 Packaging and forming specification E2: Embossed tape and reel VCSP85H3 (BD60910GU) 3.00± 0.05 1.0MAX 0.25±0.1 3.00±0.05 <Tape and Reel information> 1PIN MARK (φ0.15)INDEX POST B 1 0.50± 0.05 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 ) 0.50±0.05 A E D C B A 2500pcs P=0.5×4 0.06 S 0.05 A B Embossed carrier tape (heat sealing method) Quantity Direction of feed S 24- φ 0.30± 0.05 Tape 2 3 4 5 1pin P=0.5 × 4 (Unit : mm) www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. Reel 30/30 Direction of feed ∗ Order quantity needs to be multiple of the minimum quantity. 2011.07 - Rev.B Notice Notes 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, communication 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, 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 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 © 2011 ROHM Co., Ltd. All rights reserved. R1120A