Atmel LED Drivers MSL3163 and MSL3164 16-string White & RGB LED Drivers with Adaptive Power Control, E²PROM, and SPI/I²C/SMBus Serial Interface Datasheet Brief
Atmel LED Drivers-MSL3163 and MSL3164 16-string White & RGB LED Drivers with Adaptive Power Control, E²PROM, and SPI/I²C/SMBus Serial Interface General Description The Atmel LED DriversMSL3163 and MSL3164 compact, high-power LED string drivers use internal current control MOSFETs to sink up to 100mA per string, with current accuracy and matching better than 3%. The MSL3163/4 drive 16 parallel strings of ten white LEDs each, for a total of 160 white LEDs per device.
Atmel LED Drivers-MSL3163 and MSL3164 16-string White & RGB LED Drivers with Adaptive Power Control, E²PROM, and SPI/I²C/SMBus Serial Interface Key Features • 12-bit PWM String Dimming Operates at 240Hz • ±3% Current Accuracy and Current Balance • Fast Serial Interfaces Support up to 16 Devices per Bus: • Video Frame (VSYNC) and Line (HSYNC) Sync Inputs - MSL3164 20 MHz SPI • Sync Loss Detectors Optionally Disable LED Strings - MSL3163 1 MHz I2C • Multiple MSL3163/4s Share String Power Supplies and
FBO2 FBI1 FBO1 NC VDD VIN EN ILED GND CGND Package Pin-out 40 39 38 37 36 35 34 33 32 31 FBI2 1 30 FBO3 2 29 SDA FBI3 3 28 TEST PHI 4 27 SCL GSC 5 26 AD0 PWM 6 MSL3163 STR0 7 (TOP VIEW) STR1 8 23 STR14 STR2 9 22 STR13 STR3 10 21 STR12 4 Figure 1.
Atmel LED Drivers-MSL3163 and MSL3164 16-string White & RGB LED Drivers with Adaptive Power Control, E²PROM, and SPI/I²C/SMBus Serial Interface Figure 3. Package Dimensions: 40 Pin 6mm x 6mm x 0.75mm TQFN (0.
Package Pin Description Table 1. Pin Assignments PIN PIN NAME MSL3163 MSL3164 PIN DESCRIPTION 1 FBI2 FBI2 Efficiency Optimizer input 2 Connect FBI2 to FBO2 of the next device when chaining devices (Figure 7). If unused connect FBI2 to GND. 2 FBO3 FBO3 Efficiency Optimizer output 3 Connect FBO3 to the third power supply’s feedback node or to FBI3 of the previous device when chaining devices (Figure 7). If unused connect FBO3 to GND.
Atmel LED Drivers-MSL3163 and MSL3164 16-string White & RGB LED Drivers with Adaptive Power Control, E²PROM, and SPI/I²C/SMBus Serial Interface PIN PIN NAME MSL3163 MSL3164 PIN DESCRIPTION 2.5V internal LDO regulator output VDD powers internal logic. Bypass VDD to GND with a 4.7µF ceramic capacitor placed close to VDD.
Electrical Characteristics (Typical Application Circuit, VIN = 5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VIN = 5V, TA = +25°C). PARAMETER SYMBOL CONDITIONS AND NOTES MIN TYP MAX UNIT 4.75 5 5.5 V 18 28 DC ELECTRICAL CHARACTERISTICS VIN Operating Supply Voltage VIN Operating Supply Current VIN IVIN EN = VIN, SLEEP = 0, RILED = 12.7kΩ, PHI = 240Hz, GSC = 983.
Atmel LED Drivers-MSL3163 and MSL3164 16-string White & RGB LED Drivers with Adaptive Power Control, E²PROM, and SPI/I²C/SMBus Serial Interface PARAMETER SYMBOL CONDITIONS AND NOTES MIN TYP MAX UNIT 18.15 20.00 21.88 MHz 10 kHz AC ELECTRICAL CHARACTERISTICS OSC Frequency fOSC PHI Frequency fPHI OSCCTRL = 0x04 0.
PARAMETER SYMBOL SCK Falling Edge to CSB Rising Edge Setup Time tSCK:CSB(SU) 50 ns tMOSI(SU) 16 ns tMOSI(HOLD) 20 ns MOSI to Falling Edge of SCK Setup Time SCK Falling Edge to MOSI Setup Time CONDITIONS AND NOTES MIN TYP MAX UNIT MOSI, CSB, SCK Signal Rise Time tR(SPI) 5.0 ns MOSI, CSB, SCK Signal Fall Time tF(SPI) 5.
Atmel LED Drivers-MSL3163 and MSL3164 16-string White & RGB LED Drivers with Adaptive Power Control, E²PROM, and SPI/I²C/SMBus Serial Interface Block Diagram The block diagram for the Atmel LED Drivers-MSL3163/4 is shown in Figure 4. Figure 4.
Typical Application Circuit Ω Ω Ω Figure 5. Atmel LED Driver-MSL3164 Driving 160 White LEDs in 16 Strings at 60mA Per String.
Atmel LED Drivers-MSL3163 and MSL3164 16-string White & RGB LED Drivers with Adaptive Power Control, E²PROM, and SPI/I²C/SMBus Serial Interface Detailed Description The MSL3163 and MSL3164 are highly integrated, flexible multi-string LED drivers with power supply control to maximize system efficiency. The drivers easily connect to a video subsystem. Although optional, this offers a simple architecture for use in LCD TV backlight applications.
Setting the LED String Current with RILED and ISTR The MSL3163/4 features 16 current sink outputs, rated at 40V, each designed to sink up to 100mA peak. Limit average current to 60mA if the PCB copper around the MSL3163/4 is the only heat sink employed. The maximum string current, IILED, for all 16 LED string inputs is set by a single external resistor, RILED, placed from ILED to GND, whose value is determined using: RILED = 762 I ILED . For example, a full-scale LED current of 60mA returns RILED = 12.
Atmel LED Drivers-MSL3163 and MSL3164 16-string White & RGB LED Drivers with Adaptive Power Control, E²PROM, and SPI/I²C/SMBus Serial Interface Connecting the Efficiency Optimizer to an LED String Power Supply and Selecting Resistors The MSL3163/4 are designed to control LED string power supplies that use a voltage divider (RTOP and RBOTTOM in Figure 6) to set output voltage, and whose regulation feedback voltage is not more than 3.5V.
Figure 7. Example of Cascading Multiple Devices to Optimize Common Power Supplies Direct PWM Control of the LED Strings An external PWM signal applied to the PWM input allows direct PWM control over the strings when bits PWMEN and PWMDIRECT are set in PWM Control register 0x1E. This configuration bypasses PHI and GSC, but allows automatic LED string phase delay using bit D2 of register 0x1E.
Atmel LED Drivers-MSL3163 and MSL3164 16-string White & RGB LED Drivers with Adaptive Power Control, E²PROM, and SPI/I²C/SMBus Serial Interface Register Map and the E2PROM Register Map Summary Control the MSL3163/4 using the 96 registers in the range 0x00 thru 0x5F (Table 2). It may be convenient, and it is allowed, to read and write to unused bits in this range when accessing registers, but always write zeros. Reads from unused bits always return zeros.
Table 2.
Atmel LED Drivers-MSL3163 and MSL3164 16-string White & RGB LED Drivers with Adaptive Power Control, E²PROM, and SPI/I²C/SMBus Serial Interface Register Power-Up Defaults Register power-up default values are shown in Table 3 Table 3.
REGISTER NAME AND ADDRESS 0x1E PWMCTRL 0x1F GINT 0x20 0x21 ↓ 0x3E 0x3F 0x40 0x41 ↓ 0x5E 0x5F STR0SET ↓ STR15SET REGISTER DATA POWER-UP CONDITION D7 D6 D5 D4 D3 D2 D1 D0 PWM Operation enabled Internal PWM engine determines tON and tOFF Phase delay enabled PWM input not esed as gate for PWM engine output String on-times allowed to extend beyond PWM frame GINT ignored String current fold-back enabled 1 0 0 1 0 1 0 1 Although Disabled, Global Intensity is set to (127) / 256 = 49.
