AS3693E-ZTFT

AS3693E austriamicrosystems Product Specification, Confidential AS3693E–16 Channel high precision LED driver for LCD Backlight 1 General Description The AS3693E is a 16 channels high precision LED controller with build in PWM generators for driving external FETs in LCD-backlight panels. The output current can be controlled either by an external PWM signal or by 16 build in PWM generators with programmable delay, period and duty cycle. Three free configurable dynamic power feedback circuits make the device usable for white LED as well as RGB backlights. Build in safety features include thermal shutdown as well as open and short LED detection. All circuit parameters are programmable via I2C or SPI interface. 2 Key Features









16 Channel LED driver Output current only limited by external transistor Output voltage 0.4V to 50V Absolute current accuracy +/- 0.5% Output slew rate programmable Current programmable with external resistor Linear current control with 8 - bit DAC Linear current control with external analog voltage Digital current control with external PWM signal Digital current control with 16 independent PWM generators










Free programmable 12 bit resolution ( period, high time and delay ) Overvoltage detection ( short LED ) Undervoltage detection ( open LED ) Temperature shutdown Fault interrupt output I2C interface SPI interface 5 bit device - address (sets device address and interface mode) Automatic supply regulation feedback Each output can be assigned to red, green or blue feedback. Package epTQFP64 and QFN64 3 Applications • www.austriamicrosystems.com LED backlighting for LCD – TV sets and monitors Revision 1.5 / 2009-12-21 1 - 33 AS3693E austriamicrosystems 4 Block Diagram V2_5 REF Vreg FBB FBG FBR Vsupply PWM Reference, DAC PWM PWM Fault detectors PWM SMPS feedback PWM PWM PWM PWM AS3693E PWM PWM PWM PWM PWM SDA SCL CS SDO Vsync Hsync SPI / I2C Interface PWM PWM Addr2 Addr1 Fault 86 byte registers PWM V2_5 PWM www.austriamicrosystems.com Revision 1.5 / 2009-12-21 2 - 33 AS3693E austriamicrosystems Table of Contents 1 2 3 4 5 General Description ....................................................................................................................................... 1 Key Features.................................................................................................................................................. 1 Applications.................................................................................................................................................... 1 Block Diagram................................................................................................................................................ 2 Characteristics ............................................................................................................................................... 4 5.1 Absolute Maximum Ratings .................................................................................................................... 4 5.2 Operating Conditions .............................................................................................................................. 5 5.3 Electrical Characteristics......................................................................................................................... 5 6 Typical Operation Characteristics .................................................................................................................. 7 6.1 Output current vs Output Voltage ........................................................................................................... 7 6.2 Vsupply vs VREG and V2.5 at startup .................................................................................................... 7 6.3 9us Slew Rate......................................................................................................................................... 8 6.4 Supply Regulation ................................................................................................................................... 8 7 Block Description ........................................................................................................................................... 9 7.1 Feedback Circuit ..................................................................................................................................... 9 7.1.1 Feedback Selection ....................................................................................................................... 10 7.1.2 Voltage fault registers .................................................................................................................... 11 7.2 Curreg 1-16........................................................................................................................................... 11 7.3 PWM – modes ...................................................................................................................................... 13 7.3.1 PWM mode (PWM_MODE = 00) ................................................................................................... 13 7.3.2 ASYNC – mode (PWM_MODE = 01) ............................................................................................ 13 7.4 PWM – high time, period and delay registers ....................................................................................... 15 7.5 Shunt Regulator .................................................................................................................................... 16 7.5.1 Undervoltage lockout ..................................................................................................................... 16 7.6 Over temperature control ...................................................................................................................... 16 Device address setup ...................................................................................................................................... 17 7.6.1 I2C Device Address setup ............................................................................................................. 17 7.6.2 SPI Device Address setup ............................................................................................................. 17 7.7 Digital interface ..................................................................................................................................... 18 7.7.1 I2C interface .................................................................................................................................. 18 7.7.2 SPI interface .................................................................................................................................. 20 8 Register map................................................................................................................................................ 22 9 Pinout and Packaging .................................................................................................................................. 25 9.1 Pinout.................................................................................................................................................... 25 9.2 Package drawing epTQFP64 ................................................................................................................ 27 9.3 Package drawing QFN64 ..................................................................................................................... 29 10 Ordering Information .................................................................................................................................... 32 Copyright ............................................................................................................................................................. 33 Disclaimer ........................................................................................................................................................... 33 Contact Information ............................................................................................................................................. 33 www.austriamicrosystems.com Revision 1.5 / 2009-12-21 3 - 33 AS3693E austriamicrosystems 5 Characteristics 5.1 Absolute Maximum Ratings Stresses beyond those listed in Table 1 may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated in Section 5 Electrical Characteristics is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Table 1 – Absolute Maximum Ratings Symbol Parameter Min Max Unit VDDMAX Supply for LED’s -0.3 >50 V See notes VINVREG VREG supply voltage -0.3 7.0 V Applicable for pin VREG IINVREG Maximum Vreg current 100 mA VIN2.5V 2.5 V Pins -0.3 V2_5+0.3V V Applicable for 2.5V pins VIN5V 5V Pins -0.3 VREG+ 0.3V V Applicable for 5V pins2 VIN50V 50V Pins -0.3 55 V Applicable for CURR1, CURR2, CURR3 up to CURR16 IIN Input Pin Current -25 +25 mA At 25ºC, Norm: Jedec 17 TSTRG Storage Temperature Range -55 150 °C Humidity 5 85 % Non condensing -4000 4000 V Norm: MIL 883 E Method 3015 -2000 2000 V Norm: MIL 883 E Method 3015 W At Ta = 25ºC, no airflow for ePTQFP64 on two layer FR4-Cu 3 PCB VESD Electrostatic Discharge on Pins Curr1 – Curr16 VESD Electrostatic Discharge on all Pins PT Total Power Dissipation 3.8W PDERATE PT Derating Factor 40 TBODY Body Temperature during Soldering 260 Note 1 Maximum Current flowing into Vreg 4 mW/ 3 See notes °C °C according to IPC/JEDEC J-STD020C Notes: 1, As the AS3693E is not directly connected to this supply. Only the parameters VINVREG, VIN5V and VIN50V have to be guaranteed by the application 2, All pins except CURR1 to CURR16 and 2.5V 3, Copper area > 9 cm², thermal vias 4, 2.5V Pins are Fault, SDO, ADDR1 and ADDR2 www.austriamicrosystems.com Revision 1.5 / 2009-12-21 4 - 33 AS3693E austriamicrosystems 5.2 Operating Conditions Table 2 – Operating Conditions Symbol Parameter VDD Main Supply VDDTOL Main Supply Voltage Tolerance VREGINT Supply (shunt regulated by AS3693E) VREGEXT VUVL Untervoltage lockout voltage Min Typ -20 Max Unit Note Not Limited V Supply is not directly connected to the AS3693E – see section ‘Shunt Regulator’ +20 % Applies only for supply VREG is connected via Rvdd 5.0 5.2 5.4 V If internally (shunt-)regulated by ZD1 3 4.5 4.9 V If externally supplied 2.4 2.7 3 V If Vreg < UVUL current sources are turned off ( Addr 0x01,Addr 0x02 = 0x00 ) IVREG Supply Current (Chip current consumption) 20 Excluding current through shunt regulator (ZD1) – see section mA ‘Shunt Regulator’. Note: Take care of the Power dissipation of the external Resistor. IVREG_M Maximum Supply current 30 Maximum Current Into VREG – mA PIN (Supply current + shunt regulator current). 350 uA Max Unit 50.0 V +0.5 % AX Condition: externally supplied IVREG EXT_OFF Curr_reg1-16 off (register 01h = 00h, register 02h = 00h) 5.3 Electrical Characteristics Table 3 – Analog Electrical Characteristics Symbol Parameter VCURR Voltage at CURR1 to CURR16 Min Typ Note Using 250mV reference -0.5 @25C TJUNCTION, excluding variation of external resistors Using 250mV reference (1) ICURR, TOL Current Source Tolerance -1.5 +1.5 % -20°C to +100°C TJUNCTION, -20°C to +85°C TAMB, excluding variation of external resistors; V(CURRx)