Download datasheet for MSL2162DQ by Atmel

Download datasheet for MSL2162DQ by Atmel
Atmel LED Driver-MSL2162
16-string White and RGB LED Driver with Adaptive Configuration,
EEPROM, and SPI Bus
Datasheet Brief
Atmel LED Driver-MSL2162
16-string White and RGB LED Driver with
Adaptive Configuration, EEPROM, and SPI Bus
General Description
The Atmel LED DriverMSL2162 compact, highpower LED string driver
uses external current control
MOSFETs to sink up to
350mA per string, with
current accuracy and matching
better than 1.5%. The
MSL2162 drives 16 parallel
strings of LEDs, and offers fault
detection and management of
open and short circuit LEDs.
The MSL2162 features a 20 MHz SPI bus that supports video frame-by-frame
LED string intensity control for up to eight interconnected devices. Frame-byframe control allows active area dimming and phase shifted PWM timing for
improved backlight performance. The advanced PWM engine synchronizes
PWM dimming to the video signals for reduced motion blur and waterfall noise.
The MSL2162 adaptively controls the DC-DC converters powering the
LED strings, using Atmel efficiency optimizers to minimize power use while
maintaining LED current accuracy.
A unique combination of regulation current control and pulse width dimming
management offers simple, full-screen brightness control, versatile area
dimming, and a consistent white point. A current sense resistor sets LED current
for each string, offering the flexibility to drive each string with a different current.
8-bit control adjusts LED current equally for all 16 LED strings. Separate 12-bit
registers control individual string pulse width dimming.
The MSL2162 monitors LED strings for open circuit, short circuit, loss-of-videosync, and over-temperature faults, and provides a hardware fault output to
notify a microcontroller. Use the serial interface for detailed fault status and
control. Additionally, the MSL2162 includes on-chip EEPROM that allows
customization of the power-up defaults, accessible through the serial interface.
The MSL2162 is packaged in a 9 x 9 x 0.85mm, 64-lead TQFN, and operates
over a -40°C to 105°C temperature range.
Applications
Long Life, Efficient LED Backlighting for:
• Televisions and Desktop Monitors
• Medical and Industrial Instrumentation
• Automotive Audio-visual Displays
Channel Signs
Architectural Lighting
Ordering Information
16-CHANNEL LED STRING DRIVERS
2
PART
INTERFACE
PACKAGE
MSL2162DQ
SPI
64-pin, 9 x 9 x 0.85mm TQFN
Atmel LED Driver-MSL2162
Atmel LED Driver-MSL2162
16-string White and RGB LED Driver with
Adaptive Configuration, EEPROM, and SPI Bus
Key Features
• 12-bit PWM String Dimming Control
• ±1.5% Current Accuracy and Current Balance
• Fast 20MHz SPI Bus Supports up to Eight
MSL2162s per SPI Bus Chip Select
• Flexible Video Frame (VSYNC) and Line
(HSYNC) Sync Includes Frequency Multipliers
and Dividers
• 8-bit Adaptive Power Correction Maximizes
System Efficiency by Controlling up to Two Power
Supply Voltages
• External Current Control MOSFETs for High
Voltage and/or Current
• Drives up to 16 Parallel LED Strings per Device
• Supports Adaptive, Real-time Area Dimming for
Highest Dynamic Range LCD TVs and Monitors
• Programmable String Phase Reduces Motion Blur
and Improves Efficiency
• Second Set of PWM Registers Allows Alternate
Brightness and Timing Selection with a Single Control
• EEPROM Saves Power-on Default Settings
• LED Open Circuit and Short Circuit Fault Detection
• Individual Per-String Fault Detection Enable
• Over-temperature Shut-off Protection
• Broadcast Write Simplifies Configuration
• -40°C To +105°C Operating Temperature Range
• Global Intensity Control via Serial Interface
Application Circuit
Atmel LED Driver-MSL2162
3
Quick Start Guide
The MSL2162 LED string controller drives, monitors, and dims multiple LEDs at high efficiency for LCD backlighting and
signage applications. This section summarizes the capabilities of the MSL2162 for quick evaluation.
How Many LEDs and Drivers?
The MSL2162 controls 16 strings of series-connected LEDs at up to 350mA per string. Up to eight MSL2162s share
a serial interface. The maximum number of LEDs per string is determined by the maximum power supply voltage, the
LED forward voltage drop (VF), and the gate drive outputs of the MSL2162. The MSL2162 FET gate drive outputs are
optimized for FETs requiring up to 10nC of charge.
LED Power Supplies and Efficiency Optimizers (EOs)
The MSL2162 Efficiency Optimizer (EO) circuits dynamically adjust up to two LED string power supplies to the minimum
voltage necessary to accurately drive the LED strings while assuring accurate current flow. The power supplies can use
any topology, and are typically DC-DC boost or buck, or AC-DC off-line switcher supplies. The EOs rely on close matching
of the LED strings connected to a string supply. The better the matching, the better is the overall efficiency. Multiple
devices easily link together to optimize a single power supply.
Timing, PWM, Intensity Controls, and Synchronization
For video applications, the PWM LED drive signals synchronize to the LCD’s video frame timing via the PHI input, and
to the LCD’s pixel timing via the GSC input. This synchronization eliminates beating artifacts. Suitability for LED backlight
architectures is shown in Table 1. Area LED dimming for direct backlighting is supported for contrast and color gamut
improvement. Motion blur is reduced by setting each LED string’s PWM phasing individually to synchronize PWM off-times
with the LCD update timing.
The MSL2162 also includes easily controlled internal PWM timing generation for standalone (non-video) LED lighting
applications that do not provide external timing sources. One MSL2162 simply generates PWM timing for itself, and for the
other devices in a multiple device application. Optionally, a single external PWM signal applied to the PWM input controls all
of the strings on-times, with automatic progressive phase delay available through a single control bit.
Table 1. LED Common Backlight Drive Architectures and Features
MOTION BLUR
REMOVAL
AREA DIMMING
MANAGEMENT
White LED - bottom edge-Lit
No
No
White LED - top/bottom edge-Lit
No
No
White LED - 4 sides edge-lit
No
No
White LED - direct back-lit
Yes, LED string
phasing
Higher contrast ratio
(area dimming)
RGB LED - direct back-lit
Yes, LED string
phasing
Higher contrast ratio and
color gamut
BACKLIGHT TYPE
4
STRING SUPPLY
OPTIONS
Up to two Eficiency
Optimized power
supplies
Two Eficiency
Optimized power
supplies
Atmel LED Driver-MSL2162
Atmel LED Driver-MSL2162
16-string White and RGB LED Driver with
Adaptive Configuration, EEPROM, and SPI Bus
Table 2. Timing and LED Intensity Control Capability
LED INTENSITY CONTROL
RESOLUTION
Global LED string current adjust
8-bit DAC reduces string current globally from maximum set external resistors
Global LED string PWM
8-bit global PWM control
Individual LED string PWM
12-bit PWM individual string control
Total LED string PWM control
12-bit LED String PWMs, computed from global and individual PWM settings
Package Pinout
S4
D3
G3
S3
D2
G2
S2
D1
G1
S1
D0
G0
S0
VDD
VIN
EN
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
Figure 1. Atmel LED Driver-MSL2162 Pinout, 64-pin TQFN
G4
1
48
PWM
D4
2
47
GSC
S5
3
46
PHI
G5
4
45
VCC
D5
5
44
D15
S6
6
43
G15
G6
7
42
S15
D6
8
41
D14
S7
9
40
G15
MSL2162
Atmel LED Driver-MSL2162
30
31
32
G11
D11
S12
S11
33
29
16
D10
FLTB
28
G12
G10
34
27
15
S10
CSB
26
D12
D9
35
25
14
G9
SCK
24
S13
S9
36
23
13
D8
MOSI
22
G13
G8
37
21
12
S8
MISO
20
D13
FBO1
38
19
11
FBI1
D7
18
S14
FBO2
39
17
10
ADDR
G7
5
Figure 2. Package Dimensions: 64-lead, 9mm x 9mm x 0.85mm TQFN (0.5mm lead pitch) with Exposed Pad
Figure 2. Package Dimensions: 64 Pin 9mm x 9mm x 0.85mm TQFN (0.5mm pin pitch) with exposed pad
Package Connection Description
Table 3. Atmel LED Driver-MSL2162 Connection Description
6
NO.
NAME
DESCRIPTION
1
G4
Gate output 4
Gate drive output for external MOSFET 4.
Connect G4 to the gate of the external MOSFET driving LED string 4.
2
D4
Drain sense input 4
Drain sense input for external MOSFET 4.
Connect D4 through a 10M resistor to the drain of the external MOSFET driving LED string 4.
Atmel LED Driver-MSL2162
Atmel LED Driver-MSL2162
16-string White and RGB LED Driver with
Adaptive Configuration, EEPROM, and SPI Bus
Table 3. Atmel LED Driver-MSL2162 Connection Description
NO.
NAME
DESCRIPTION
3
S5
Current sense input 5
Current sense input for LED string 5.
Connect S5 to the source of the external MOSFET and to the current sense resistor for LED string 5.
The full-scale LED current threshold is 500mV is across the current sense resistor.
4
G5
Gate output 5
Gate drive output for external MOSFET 5.
Connect G5 to the gate of the external MOSFET driving LED string 5.
5
D5
Drain sense input 5
Drain sense input for external MOSFET 5.
Connect D5 through a 10M resistor to the drain of the external MOSFET driving LED string 5.
6
S6
Current sense input 6
Current sense input for LED string 6.
Connect S6 to the source of the external MOSFET and to the current sense resistor for LED string 6.
The full-scale LED current threshold is 500mV is across the current sense resistor.
7
G6
Gate output 6
Gate drive output for external MOSFET 6.
Connect G6 to the gate of the external MOSFET driving LED string 6.
8
D6
Drain sense input 6
Drain sense input for external MOSFET 6.
Connect D6 through a 10M resistor to the drain of the external MOSFET driving LED string 6.
9
S7
Current sense input 7
Current sense input for LED string 7.
Connect S7 to the source of the external MOSFET and to the current sense resistor for LED string 7.
The full-scale LED current threshold is 500mV is across the current sense resistor.
10
G7
Gate output 7
Gate drive output for external MOSFET 7.
Connect G7 to the gate of the external MOSFET driving LED string 7.
11
D7
Drain sense input 7
Drain sense input for external MOSFET 7.
Connect D7 through a 10M resistor to the drain of the external MOSFET driving LED string 7.
12
MISO
Master input, slave output
MISO is the MSL2162 SPI bus data output.
13
MOSI
Master output, slave input
MOSI is the MSL2162 SPI bus data input.
14
SCK
SPI serial shift clock
SCK is the MSL2162 clock input for the SPI bus.
Atmel LED Driver-MSL2162
7
8
NO.
NAME
DESCRIPTION
15
CSB
Chip select bar
CSB is the MSL2162 SPI bus chip select input for SPI transactions. Drive CSB low to enable serial
interface communication.
16
FLTB
Fault indication output (active low)
Open drain output FLTB sinks current to ground whenever the MSL2162 detects and veriies a fault. FLTB
remains low until the fault registers are read, and reasserts if the fault persists.
17
ADDR
Slave ID selection inputs
Connect ADDR to ground through a resistor to set the SPI bus address.
18
FBO2
Eficiency Optimizer output 2
Connect FBO2 to the second power supply’s feedback node.
Connect FBO2 to ground if unused.
19
FBI1
Eficiency Optimizer input 1
Connect FBI1 to FBO1 of the next device when connecting MSL2162s in series.
If unused connect FBI1 to ground.
20
FBO1
Eficiency Optimizer output 1
Connect FBO1 to the irst power supply’s feedback node. Connect FBO1 to ground if unused.
21
S8
Current sense input 8
Current sense input for LED string 8.
Connect S8 to the source of the external MOSFET and to the current sense resistor for LED string 8.
The full-scale LED current threshold is 500mV is across the current sense resistor.
22
G8
Gate output 8
Gate drive output for external MOSFET 8.
Connect G8 to the gate of the external MOSFET driving LED string 8.
23
D8
Drain sense input 8
Drain sense input for external MOSFET 8.
Connect D8 through a 10M resistor to the drain of the external MOSFET driving LED string 8.
24
S9
Current sense input 9
Current sense input for LED string 9.
Connect S9 to the source of the external MOSFET and to the current sense resistor for LED string 9.
The full-scale LED current threshold is 500mV is across the current sense resistor.
25
G9
Gate output 9
Gate drive output for external MOSFET 9.
Connect G9 to the gate of the external MOSFET driving LED string 9.
26
D9
Drain sense input 9
Drain sense input for external MOSFET 9.
Connect D9 through a 10M resistor to the drain of the external MOSFET driving LED string 9.
Atmel LED Driver-MSL2162
Atmel LED Driver-MSL2162
16-string White and RGB LED Driver with
Adaptive Configuration, EEPROM, and SPI Bus
NO.
NAME
DESCRIPTION
27
S10
Current sense input 10
Current sense input for LED string 10.
Connect S10 to the source of the external MOSFET and to the current sense resistor for LED string 10.
The full-scale LED current threshold is 500mV is across the current sense resistor.
28
G10
Gate output 10
Gate drive output for external MOSFET 10.
Connect G10 to the gate of the external MOSFET driving LED string 10.
29
D10
Drain sense input 10
Drain sense input for external MOSFET 10.
Connect D10 through a 10M resistor to the drain of the external MOSFET driving LED string 10.
30
S11
Current sense input 11
Current sense input for LED string 11.
Connect S11 to the source of the external MOSFET and to the current sense resistor for LED string 11.
The full-scale LED current threshold is 500mV is across the current sense resistor.
31
G11
Gate output 11
Gate drive output for external MOSFET 11.
Connect G11 to the gate of the external MOSFET driving LED string 11.
32
D11
Drain sense input 11
Drain sense input for external MOSFET 11.
Connect D11 through a 10M resistor to the drain of the external MOSFET driving LED string 11.
33
S12
Current sense input 12
Current sense input for LED string 12.
Connect S12 to the source of the external MOSFET and to the current sense resistor for LED string 12.
The full-scale LED current threshold is 500mV is across the current sense resistor.
34
G12
Gate output 12
Gate drive output for external MOSFET 12.
Connect G12 to the gate of the external MOSFET driving LED string 12.
35
D12
Drain sense input 12
Drain sense input for external MOSFET 12.
Connect D12 through a 10M resistor to the drain of the external MOSFET driving LED string 12.
36
S13
Current sense input 13
Current sense input for LED string 13.
Connect S13 to the source of the external MOSFET and to the current sense resistor for LED string 13.
The full-scale LED current threshold is 500mV is across the current sense resistor.
37
G13
Gate output 13
Gate drive output for External MOSFET 13.
Connect G13 to the gate of the external MOSFET driving LED string 13.
Atmel LED Driver-MSL2162
9
NO.
NAME
38
D13
Drain sense input 13
Drain sense input for external MOSFET 13.
Connect D13 through a 10M resistor to the drain of the external MOSFET driving LED string 13.
39
S14
Current sense input 14
Current sense input for LED string 14.
Connect S14 to the source of the external MOSFET and to the current sense resistor for LED string 14.
The full-scale LED current threshold is 500mV is across the current sense resistor.
40
G14
Gate output 14
Gate drive output for external MOSFET 14.
Connect G14 to the gate of the external MOSFET driving LED string 14.
41
D14
Drain sense input 14
Drain sense input for external MOSFET 14.
Connect D14 through a 10M resistor to the drain of the external MOSFET driving LED string 14.
42
S15
Current sense input 15
Current sense input for LED string 15.
Connect S15 to the source of the external MOSFET and to the current sense resistor for LED string 15.
The full-scale LED current threshold is 500mV is across the current sense resistor.
43
G15
Gate output 15
Gate drive output for external MOSFET 15.
Connect G15 to the gate of the external MOSFET driving LED string 15.
44
D15
Drain Sense Input 15
Drain sense input for external MOSFET 15.
Connect D15 through a 10M resistor to the drain of the external MOSFET driving LED string 15.
45
VCC
5V internal LDO regulator output
VCC powers the FBO outputs.
Bypass VCC to ground with a 4.7µF ceramic capacitor placed close to VCC.
46
PHI
Phase synchronization input
Drive PHI with an external signal from 40Hz to 10khz
kHz to synchronize the MSL2162 clock. In TV applications drive PHI with the VSYNC signal.
47
GSC
Gate shift clock input
Drive GSC with the gate shift clock of the video signal, from 0 to 10khz
MHz. In TV applications drive GSC with the HSYNC signal.
PWM
PWM input
PWM allows external control of the brightness of all LED strings.
Drive PWM with a pulse-width modulated signal with duty ratio ranging from 0% to 100% and frequency up
to 5kHz. When not conigured as an input, PWM is high impedance.
48
10
DESCRIPTION
Atmel LED Driver-MSL2162
Atmel LED Driver-MSL2162
16-string White and RGB LED Driver with
Adaptive Configuration, EEPROM, and SPI Bus
NO.
NAME
DESCRIPTION
49
EN
Enable input (active high)
Drive EN high to turn on the MSL2162, drive EN low to turn off the MSL2162.
For automatic start-up, connect EN to VIN. When EN is low, the entire device, including the serial
interface, is turned off. Drive EN high to initiate a boot load of the EEPROM data into the control registers
to set the startup condtions.
50
VIN
Supply voltage input
Connect a 12V ±10% supply to VIN. Bypass VIN to ground with a 10µF ceramic capacitor placed close to VIN.
51
VDD
2.5V internal LDO regulator output
VDD powers internal logic. Bypass VDD to ground with a 4.7µF ceramic capacitor placed close to VDD.
52
S0
Current sense input 0
Current sense input for LED string 0.
Connect S0 to the source of the external MOSFET and to the current sense resistor for LED string 0.
The full-scale LED current threshold is 500mV is across the current sense resistor.
53
G0
Gate output 0
Gate drive output for external MOSFET 0.
Connect G0 to the gate of the external MOSFET driving LED string 0.
54
D0
Drain sense input 0
Drain sense input for external MOSFET 0.
Connect D0 through a 10M resistor to the drain of the external MOSFET driving LED string 0.
55
S1
Current sense input 1
Current sense input for LED string 1.
Connect S1 to the source of the external MOSFET and to the current sense resistor for LED string 1.
The full-scale LED current threshold is 500mV is across the current sense resistor.
56
G1
Gate output 1
Gate drive output for external MOSFET 1.
Connect G1 to the gate of the external MOSFET driving LED string 1.
57
D1
Drain sense input 1
Drain sense input for external MOSFET 1.
Connect D1 through a 10M resistor to the drain of the external MOSFET driving LED string 1.
58
S2
Current sense input 2
Current sense input for LED string 2.
Connect S2 to the source of the external MOSFET and to the current sense resistor for LED string 2.
The full-scale LED current threshold is 500mV is across the current sense resistor.
59
G2
Gate output 2
Gate drive output for external MOSFET 2.
Connect G2 to the gate of the external MOSFET driving LED string 2.
60
D2
Drain sense input 2
Drain sense input for external MOSFET 2.
Connect D2 through a 10M resistor to the drain of the external MOSFET driving LED string 2.
Atmel LED Driver-MSL2162
11
NO.
NAME
DESCRIPTION
61
S3
Current sense input 3
Current sense input for LED string 3.
Connect S3 to the source of the external MOSFET and to the current sense resistor for LED string 3.
The full-scale LED current threshold is 500mV is across the current sense resistor.
62
G3
Gate output 3
Gate drive output for external MOSFET 3.
Connect G3 to the gate of the external MOSFET driving LED string 3.
63
D3
Drain sense input 3
Drain sense input for external MOSFET 3.
Connect D3 through a 10M resistor to the drain of the external MOSFET driving LED string 3.
64
S4
Current sense input 4
Current sense input for LED string 4.
Connect S4 to the source of the external MOSFET and to the current sense resistor for LED string 4.
The full-scale LED current threshold is 500mV is across the current sense resistor.
EP
EP
Exposed pad, power ground
Connect EP to system ground using short, wide traces. EP is also the thermal relief pad for the device.
Absolute Maximum Ratings
Voltage (With Respect to ground)
VIN, EN, D0 - D15, G0 - G15 ...................................................................................................................... -0.3V to +16V
VDD, ADDR, S0 - S15 .................................................................................................................................. -0.3V to +2.75V
FBO1, FBO2, FBI1, FLTB, PHI, GSC, PWM ........................................................................................... -0.3V to +5.5V
VCC ................................................................................................................................................................................ -0.3V to +6V
MISO, MOSI, CSB, SCK ................................................................................................................................... -0.3V to +5.5V
Current (Into Pin)
VIN ............................................................................................................................................................................................... 50mA
FBO1, FBO2 ......................................................................................................................................................+0µA to -800µA
G0 - G15 ..............................................................................................................................................................................±100mA
All other pins ............................................................................................................................................................................20mA
Continuous Power Dissipation
64-Pin 9mm x 9mm QFN (derate 38mW/°C above TA = +70°C) .....................................................2100mW
Ambient Operating Temperature Range TA = TMIN to TMAX............................................................ -40°C to +105°C
Junction Temperature ......................................................................................................................................................... +125°C
Storage Temperature Range ........................................................................................................................ -65°C to +125°C
Lead Soldering Temperature, 10s .................................................................................................................................. +300°C
12
Atmel LED Driver-MSL2162
Atmel LED Driver-MSL2162
16-string White and RGB LED Driver with
Adaptive Configuration, EEPROM, and SPI Bus
Electrical Characteristics
Typical Application Circuit, VVIN = 12V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VVIN = 12V, TA = +25°C
PARAMETER
SYMBOL
CONDITIONS AND NOTES
MIN
TYP
MAX
UNIT
10.8
12
13.2
V
Normal Operation, all LED strings driven
25
32.5
mA
500
DC ELECTRICAL CHARACTERISTICS
VIN Operating Supply Voltage
VIN
VIN Operating Supply Current
IVIN
VIN Shutdown Supply Current
ISLEEP
SLEEP = 1, SDA, SCL, ADDR, PWM, PHI
and GSC at ground or VDD
VCC Regulation Voltage
VCC
IVCC = -1.0mA
4.5
5.0
5.5
V
VDD Regulation Voltage
VDD
IVDD = -1.0mA
2.4
2.5
2.6
V
EN Input High Voltage
V
1.4
EN Input Low Voltage
0.9
0.7 x
VDD
PWM, PHI, GSC, Input High Voltage
VIH
PWM, PHI, GSC, Input Low Voltage
VIL
PHI, GSC Output High Voltage
VOH
ISOURCE = 5mA
PHI, GSC, FLTB Output
Low Voltage
VOL
ISINK = 6mA
FBO Feedback Output
Current Range
Compliance voltage 3.5V minimum
V
V
0.3 x
VDD
V
0.4
V
VDD –
0.4
0
FBO Feedback Output Current
Step Size
FBI Feedback Input Current
µA
360
A
1.2
0
FBI Input Disable Threshold
A
365
A
TBD
mV
D0 - D15 Short Circuit Fault
Detection Threshold
8
V
G0 - G15 Open Circuit Fault
Detection Threshold
8
V
Atmel LED Driver-MSL2162
13
PARAMETER
SYMBOL
G0 - G15 Gate Drive Charge
CONDITIONS AND NOTES
MIN
(Note 2)
S0 - S15 Regulation Voltage
492
S0 - S15 Voltage Matching
ISTR = 0x7F
500
-1.5
Thermal Shutdown Temperature
PARAMETER
TYP
MAX
UNIT
10
µC
508
mV
1.5
%
135
SYMBOL
CONDITIONS AND NOTES
MIN
TYP
°C
MAX
UNIT
SPI LOGIC LEVELS
MOSI, SCK, CSB Input High
Voltage
0.7 x
VDD
V
0.3 x
VDD
MOSI, SCK, CSB Input Low Voltage
MISO Output High Voltage
VOH
ISOURCE = 5mA
MISO Output Low Voltage
VOL
ISINK = 6mA
PARAMETER
SYMBOL
CONDITIONS AND NOTES
VIN –
0.4
V
V
0.4
V
MIN
TYP
MAX
UNIT
19.4
20
20.6
MHz
AC ELECTRICAL CHARACTERISTICS
OSC Frequency
fOSC
PHI Frequency
fPHI
0.04
10
kHz
GSC Frequency
fGSC
0
10
MHz
PWM Frequency
fPWM
5
kHz
100
%
PWM Duty Cycle
PHI Lock
14
fOSC = 20MHz, TA = 25°C
0
4
PHI
cycles
Atmel LED Driver-MSL2162
Atmel LED Driver-MSL2162
16-string White and RGB LED Driver with
Adaptive Configuration, EEPROM, and SPI Bus
PARAMETER
SYMBOL
CONDITIONS AND NOTES
MIN
TYP
MAX
UNIT
20
MHz
SPI TIMING CHARACTERISTICS
SCK Frequency
CSB Falling Edge to SCK Rising
Edge set-up Time
tCSB:SCK(SU)
100
ns
SCK Falling Edge to CSB Rising
Edge set-up Time
tSCK:CSB(SU)
50
ns
tMOSI(SU)
16
ns
tMOSI(HOLD)
20
ns
MOSI to Falling Edge of SCK
set-up Time
SCK Falling Edge to MOSI
set-up Time
MOSI, CSB, SCK Signal Rise Time
tR(SPI)
5.0
ns
MOSI, CSB, SCK Signal Fall Time
tF(SPI)
5.0
ns
CSB Falling Edge to MISO Data
Valid
tCSB:MISO(DV)
50
ns
CSB Rising Edge to MISO
High Impedance
tCSB:MISO(HIZ)
50
ns
SCK Rising Edge to MISO
Data Valid
tVALID
80
ns
SCK capacitive load = 200pF
25
Note 1. Subject to thermal dissipation characteristics of the device.
Note 2. Guaranteed by design, not production tested.
Atmel LED Driver-MSL2162
15
Typical Application Circuit
Figure 3. Atmel LED Driver-MSL2162 Driving 160 white LEDs in 16 Strings
16
Atmel LED Driver-MSL2162
Atmel LED Driver-MSL2162
16-string White and RGB LED Driver with
Adaptive Configuration, EEPROM, and SPI Bus
Detailed Description
The MSL2162 is a highly integrated, flexible, multi-string
LED driver. It drives external MOSFETs to allow high
LED string currents, and includes power supply control
to maximize efficiency. The driver optionally connects
to a video subsystem to offer a simple architecture
for use in LCD TV backlight applications. Up to eight
devices easily connect together to drive large numbers
of LED strings in a system. The driver provides multiple
methods of controlling LED brightness, through both
peak current control and through pulse width control
of the string drive signals. Peak current control offers
excellent color consistency, while pulse width control
allows brightness management. An on-chip E2PROM
holds all the default control register values. At power-up
the data in the E2PROM automatically copy directly to
the control registers, setting up the device for operation.
The factory programmed E2PROM values are changed
using the serial interface when a different power-up
condition is desired.
The device interfaces to a microcontroller using an SPI
compatible serial interface. The 20MHz SPI compatible
interface supports up to eight devices per Chip Select
line. While typically the LED drive PWM signal is
internally generated, the driver also accepts an external
direct PWM drive signal applied to the PWM input that
sets the PWM duty and the frequency of the string
drive signals. The MSL2162 also allows phase spreading
when external PWM direct drive is used. With phase
spreading enabled, a progressive 1/16 phase delay per
string helps reduce both the transient load on the LED
power supplies, and the power supply input capacitor
size requirements.
The PWM frequency of the drivers is either
synchronized to an external signal applied to PHI, or
generated from the internal oscillator for stand-alone
applications. Typically the VSYNC signal from the video
system is used for the PHI input. A frequency multiplier
(1x to 32x) processes this signal for use by the internal
PWM engine. The on-time of each string is individually
programmed via the device registers, providing a peak
resolution of 12-bits when using the on-chip PWM
generator. The actual resolution of the PWM frequency
Atmel LED Driver-MSL2162
depends upon on the ratio of the GSC frequency
(typically provided by a systems HSYNC signal, but can
be internally generated) to the PHI frequency, because
the on-time of a string is programmed as a 12-bit count
of the number of GSC clock cycles. This count can be
further scaled by an 8-bit Global intensity value, when
enabled. The GSC clock is also used to precisely set
each string’s phase delay so that it is synchronized to its
physical position relative to the video frame.
The Efficiency Optimizers control a wide range of
different architectures of external DC/DC and AC/DC
converters. Multiple drivers in a system communicate
with each other in real time to select an optimized
operating voltage for the LEDs. This allows design of
the power supply for the worst case Forward Voltage
(Vf) of the LEDs without worrying about excessive
power dissipation issues. During the start-up sequence
the MSL2162 automatically reduces the power supply
voltage to the minimum voltage required to keep
the LEDs in current regulation. The devices can be
configured to periodically perform this optimization to
compensate for changes of the LED’s forward voltage,
and to assure continued optimum power savings.
Internal Regulators and Enable Input
The MSL2162 includes two internal linear regulators
that provide VCC (5V) and VDD (2.5V) for internal
circuitry. VIN (12V nominal) supplies the VCC and VDD
regulators. Bypass VIN to ground with a 10µF capacitor
close to the device. Bypass VCC to ground with a 4.7µF
capacitor close to the device. Bypass VDD to ground
with a 4.7µF capacitor close to the device.
The MSL2162 enable input, EN, enables the device.
Drive EN low to enter low power operation, which
lowers quiescent current draw to less than 20µA. With
EN low the serial interface is ignored. Drive EN high
to turn on the device. When EN is driven high the
contents of the E2PROM are boot loaded into the control
registers, simulating a cold start-up.
17
Setting the Maximum LED String Current with
the Source Resistor
The maximum string current, ILEDn, for each string is
set by a shunt resistor connected to ground from
the Source terminal of the string drive MOSFET. The
feedback threshold is 500mV. Determine the resistor
value using:
RSn =
0.5
I LEDn
Ω.
.
For example, a full-scale LED current of 100mA returns
RSn = 5 . The current for all LED strings is reduced from
full-scale value with 8-bit resolution using ISTR, the
String Current Control register 0x31.
Connecting the Efficiency Optimizer to an LED
String Power Supply and Selecting Resistors
The MSL2162 is designed to control LED string power
supplies that use a voltage divider (RTOP and RBOTTOM in
Figure 4) to set output voltage, and whose regulation
feedback voltage is not more than 3.5V.
To select the resisters first determine VOUT(MIN) and
VOUT(MAX), the minimum and maximum string supply
voltage limits, using:
VOUT(MIN) = (Vf (MIN) *[#ofLEDs])+ 0.5 ,
and
VOUT(MAX) = (Vf (MAX) *[#ofLEDs])+ 0.5 ,
where Vf(MIN) and Vf(MAX) are the LED’s minimum and
maximum forward voltage drops at the peak current
set by RSn (page 10). For example, if the LED data
are Vf(MIN) = 3.5V and Vf(MAX) = 3.8V, and ten LEDs are
used in a string, then the total minimum and maximum
voltage drop across a string is 35V and 38V. Adding
an allowance of 0.5V of for the string drive MOSFET
headroom brings VOUT(MIN) to 35.5V and VOUT(MAX) to
38.5V. Then determine RTOP using:
RTOP =
VOUT ( MAX ) − VOUT ( MIN )
I FBOn ( MAX )
where IFBOn(MAX) is the 255µA maximum output current
of the Efficiency Optimizer outputs FBOn. Finally,
determine RBOTTOM using:
VOUT
POWER
SUPPLY
RTOP
RBOTTOM = RTOP *
COUT
,
VFB
,
VOUT(MAX) _ VFB
FB
1N4148
RBOTTOM
FBOn
G0
RS0
MSL2162
G15
RS15
Figure 4. FBOn Connects to the Power Supply Voltage Divider
Through a Diode
18
where VFB is the regulation feedback voltage of the
power supply. Place a diode (1N4148 or similar)
between FBO and the supply’s feedback node to
protect the MSL2162 against current flow into FBOn.
Assign all strings powered by a common supply to the
proper FBO output using String Set registers 0x40 0x5F; default assignments are presented in Table 5.
Once configured, determine the change in power supply
output voltage in response to a change in FBO output
current using:
∆VOUT = ∆I FBO ∗ RTOP .
Atmel LED Driver-MSL2162
Atmel LED Driver-MSL2162
16-string White and RGB LED Driver with
Adaptive Configuration, EEPROM, and SPI Bus
Using Multiple Atmel LED Driver-MSL2162s to Control a Common Power Supply
Multiple MSL2162s connect in a chain configuration to control a single string power supply (Figure 5) when driving more
than 16 LED stings. Cascade multiple devices with the FBI1 of one device connected to the FBO1 of the next. Connect
the first FBO1 to the power supply feedback resistor node through a diode, and the unused FBI1 input to ground as close
to the MSL2162 as possible. Assure that all strings powered by the common supply are assigned to FBO1 using String
Set registers (STRnSET) 0x40 - 0x5F (FBO1 is the power-up default setting for all strings). The chained devices work
together to ensure that the system operates at optimum efficiency. Note that the accuracy of the feedback chain may
degrade through each link of the FBI1/FBO1 chain by as much as 2%. Determine the potential worst case maximum
FBO1 current IFBOn(MAX/MIN) using:
IFBOn(MAX / MIN) = 255µA* (0.98)N-1 ,
where N is the number of MSL2162s connected in series. Use this result in the above RTOP resistor equation for the term
IFBOn(MAX) instead of using 255µA.
Take care in laying out the traces for the Efficiency Optimizer connections. Minimize the FBI1/FBO1 trace lengths as much
as possible. Do not route the signals close to traces with large variations in voltage or current, because noise may couple
into FBI1. If these traces must be routed near noisy signals, shield them from noise by using ground planes or guard
traces. Note that Figure 5 also shows the connections for an unused string.
VOUT
STRING
POWER
SUPPLY
FB
RTOP
RBOTTOM
1N4148
G0
FBO1
FBO2
G15
FBI1
G0
FBO1
FBO2
G15
FBI1
DEVICE 1
DEVICE 2
MSL2162
MSL2162
G0
FBO1
FBO2
G14
FBI1
DEVICE N
G15
D15
S15
MSL2162
Figure 5. Example of Cascading Multiple Devices to Optimize a Common String Power Supply
Atmel LED Driver-MSL2162
19
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 (bits D0 and D1 in PWM Control register 0x2D) are set to 1. This configuration bypasses PHI and GSC, but
allows LED string phase delay via the Phase Delay Enable bit PHADLYEN (bit D0 of register 0x2E). With phase delay
enabled, a progressive delay of 1/16 the PWM frame is calculated and applied successively to each string drive signal.
Register Map and the E2PROM
Register Map Summary
Control the MSL2162 using the registers in the range 0x00 - 0xBF (Table 4). Two additional registers, 0xC0 and 0xC1,
allow access to, and programming of, the E2PROM. The power-up default values for all control registers (Table 5) are stored
within the on-chip E²PROM, and any of these E²PROM values may be changed through the serial interface
Table 4. Atmel LED Driver-MSL2162 Register Map
ADDRESS AND
REGISTER NAME
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
STRINGEN0
STRINGEN1
CONFIG
FLTEN
STRFLTEN0
STRFLTEN1
FLTSTATUS
OCSTAT0
0x08
OCSTAT1
0x09
SCSTAT0
0x0A
SCSTAT1
0x0B
THRU 0x0E
0x0F
OSCFREQ
0x10
0x11
FBOCTRL0
FBOCTRL1
0x12
FBOCTRL2
0x13
FBODAC0
0x14
FBODAC1
0x15
FBODAC2
0x16
FBOSTAT
0x17
THRU 0x1F
0x20
0x21
0x22
GSCCTRL
GSCCNTR
0x23
GSCMUL
0x24
GSCDIV
20
REGISTER DATA
FUNCTION
LED string
enables
Coniguration
Fault enable
String fault
enable
Fault status
String open
circuit fault
status
String short
circuit fault
status
D7
STR7EN
STR15EN
SLEEP
FEN7
FEN15
FLTBDRV
OC7
D6
D5
D4
D3
STR6EN STR5EN
STR4EN
STR3EN
STR14EN STR13EN
STR12EN
STR11EN
FLDBKEN
I2CTOEN PHIMAXFEN GSCMAXFEN
FEN6
FEN5
FEN4
FEN3
FEN14
FEN13
FEN12
FEN11
PHIMAXFLT GSCMAXFLT
OC6
OC5
OC4
OC3
D2
D1
D0
STR2EN
STR10EN
STR1EN
STR0EN
STR9EN
STR8EN
STRSCDLY[2:0]
STRSCFEN STROCFEN FBOOCFEN
FEN2
FEN1
FEN0
FEN10
FEN9
FEN8
STRSCFLT
STROCFLT FBOOCFLT
OC2
OC1
OC0
OC15
OC14
OC13
OC12
OC11
OC10
OC9
SC7
SC6
SC5
SC4
SC3
SC2
SC1
OC8
SC0
SC15
SC14
SC13
SC12
SC11
SC10
SC9
SC8
UNUSED
Oscillator
frequency
Eficiency
Optimizer
control
-
-
HLDSTEP[1:0]
INCRSTEP[1:0]
-
-
-
-
-
OSCFREQ[2:0]
FBSDLY[1:0]
INITPWM
ACAL100
-
-
FBCFDLY[1:0]
ACALEN
TRIDIS
FBO1OCEN
FBO0OCEN
FBOEN
FBO2ACT
FBO1ACT
FBOCAL
FBOINITCAL
GSCMAXEN
GSCPOL
GSCPHISYNCEN
GSCINTEN
FBODAC1[7:0]
Eficiency
optimizer
DAC
readback
Eficiency
optimizer
status
-
FBCLDLY[1:0]
DECRSTEP[1:0]
FBODAC2[7:0]
FBODAC3[7:0]
-
FBO2OC
FBO1OC
UNUSED
GSC
processing
control
Internal clock
counter for
GSC
GSC
multiplier
GSC Divider
GSCCHKSEL
-
-
-
GSCCNTR[7:0]
GSCCNTR[15:8]
-
-
-
GSCMUL[4:0]
GSCDIV[7:0]
Atmel LED Driver-MSL2162
Atmel LED Driver-MSL2162
16-string White and RGB LED Driver with
Adaptive Configuration, EEPROM, and SPI Bus
Table 4. Atmel LED Driver-MSL2162 Register Map
REGISTER DATA
ADDRESS AND
REGISTER NAME
FUNCTION
0x25
GSCMAX
Max
oscillator
cycles
between
GSC pulses
PHICTRL
PHI
processing
control
0x26
0x27
0x28
0x29
0x2A
0x2B
0x2C
0x2D
PHICNTR
PHIMUL
PHIMAX
Internal clock
counter for
PHI
PHI multiplier
Min GSC
pulses over
PHI period
PWMCTRL0
D7
D6
D5
D4
D3
PHICHKSEL
-
-
-
-
-
-
-
-
-
-
-
GINT+1EN
GINTEN
ALTEN
OVRFLOZEN
OVRFLOEN
-
-
-
-
EXTALTEN
Global PWM
scaling
GINT[7:0]
0x30
ALTGINT
Alternate
global PWM
scaling
ALTGINT[7:0]
0x31
ISTR
0x32
PWMSTATUS
0x33
PHIPCNTR
0x5F
0x60
0x61
0x7E
0x7F
PWM0
PWM15
0x80
0x81
ALTSTR0SET
0x9E
0x9F
0xA0
0xA1
ALTSTR15SET
ALTPWM0
8-bit global
string current
PWM and
counter
PHIMAXERRCNT[2:0]
status
PHI pulse
counter and PHICNTRMAX
status
Phase delay
and EO
assignment
for string 15
12-bit
PWM setting
for string 0
12-bit
PWM setting
for string 15
Phase delay
and EO
assignment
for string 0
Phase delay
and EO
assignment
for string 15
12-bit
PWM setting
for string 0
Atmel LED Driver-MSL2162
PHIINTEN
PHIMUL[4:0]
GINT
STR15SET
PHIPOL
PHIMAX[7:0]
0x2F
0x5E
PHIMAXEN
PHICNTR[7:0]
PWMCTRL1
Phase delay
and EO
assignment
for string 0
D0
PHICNTR[15:8]
0x2E
GSC pulse
counter
D1
GSCMAX[15:8]
PWM control
0x34
GSCPCNTR
0x35
0x36 THRU 0x3F
0x40
STR0SET
0x41
D2
GSCMAX[7:0]
-
-
-
FBOSET0[1:0]
-
PHIMAX[11:8]
PWM
PWMDIRECT
GLBLEN
PHOVR
PHOVR
FLOZEN
FLOEN
PWMEN
PHADLYEN
ISTR[7:0]
PHIMAX1FLT
PHIMULFLT
GSCMULFLT PHICNTRFLT
GINTMULERR
PHIMULCNTR[0:4]
GSCPULSECNTR[7:0]
GSCPULSECNTR[12:8]
UNUSED
PHDLY0[7:0]
-
PHDLY[11:8]
PHDLY15[7:0]
FBOSET15[1:0]
-
-
PHDLY[11:8]
PWM0[7:0]
-
-
-
-
-
-
-
-
PWM0[11:8]
PWM15[7:0]
PWM15[11:8]
ALTPHDLY0[7:0]
-
-
-
-
ALTPHDLY[11:8]
ALTPHDLY15[7:0]
-
-
-
-
-
-
-
ALTPHDLY[11:8]
ALTPWM0[7:0]
-
ALTPWM0[11:8]
21
REGISTER DATA
ADDRESS AND
REGISTER NAME
FUNCTION
0xBE
12-bit
PWM setting
for string 15
EEPROM
read/write
access
0xBF
ALTPWM15
0xC0
E2ADDR
0xC1
E2CTRLSTA
D7
D6
D5
D4
-
-
-
-
BLDACT
E2ERR
-
D2
D3
D1
D0
ALTPWM15[7:0]
E2BUSY
ALTPWM15[11:8]
E2ADDR[6:0]
-
RWCTRL[2:0]
* Read-Only Registers
Register Power-up Defaults
Register power-up default values are shown in Table 5.
Table 5. Atmel LED Driver-MSL2162 Register Power-Up Defaults
REGISTER NAME
AND ADDRESS
0x00
STRINGEN0
0x01
STRINGEN1
0x02
CONFIG
0x03
FLTEN
0x04
STRFLTEN0
0x05
STRFLTEN1
0x0F
OSCFREQ
0x10
FBOCTRL0
0x11
FBOCTRL1
0x12
FBOCTRL2
POWER- UP CONDITION
REGISTERS INITIALIZED FROM E²PROM
REGISTER DATA
D7
D6
1
1
1
1
1
1
1
1
FF
1
1
1
1
1
1
1
1
FF
String short circuit confirmation delay = 8µs
String current fold-back disabled
Device is not asleep
0
0
0
0
0
0
0
0
00
FBO open circuit fault detect globally enabled
String open circuit fault detect globally enabled
LED short circuit fault detect globally enabled
GSC max fault detect globally disabled
PHI max fault detect globally disabled
0
0
0
0
0
1
1
1
07
Fault detection individually enabled
for all strings
1
1
1
1
1
1
1
1
FF
1
1
1
1
1
1
1
1
FF
fOSC = 20MHz
0
0
0
0
0
1
0
0
04
0
1
0
0
1
0
0
1
49
0
0
0
1
1
0
1
0
4A
0
0
0
0
0
1
1
1
07
0
0
0
0
0
0
0
0
00
0
0
1
0
0
1
1
13
All LED String Drive Outputs Enabled
Current sink error confirmation delay = 2µs
FBO power supply settling time allowance = 4ms
Efficiency Optimizer auto-recalibration occurs every 1 second
Efficiency Optimizer headroom steps = 3
MOSFET current sink error detection enabled
Efficiency Optimizer auto-recalibration enabled
PWM settings used during auto-recalibration
PWM settings used during initial calibration
Efficiency Optimizer correction step size = 1 LSBs (1µA)
Efficiency Optimizer initial calibration step size = 1 LSBs (1µA)
FBO outputs are globally enabled
Open circuit detection enabled for both FBO outputs
D5 D4 D3 D2 D1 D0 HEX
GSCCTRL
External signal at GSC is selected for input to the PWM engine
GSC not internally synchronized to PHI
pGSC is synchronized to falling edge of external GSC signal
GSC maximum count fault detect is disabled
Although disabled, GSC max fault monitors pGSC
GSCCNTR
Although disabled, internal GSC frequency is set to
20MHz / (19 + 1) = 1.0MHz
0
0
0
0
0
0
0
0
0
00
0x23
GSCMUL
GSC multiplexer output is multiplied by 4 (register setting + 1)
0
0
0
0
0
0
1
1
03
0x24
GSCDIV
GSC multiplier output is divided by 1 (register setting + 1)
0
0
0
0
0
0
0
0
00
GSCMAX
Although disabled, GSC max count is set to 19 clock cycles
0
0
0
1
0
0
1
1
13
0
0
0
0
0
0
0
0
00
0x20
0x21
0x22
0x25
0x26
22
Atmel LED Driver-MSL2162
Atmel LED Driver-MSL2162
16-string White and RGB LED Driver with
Adaptive Configuration, EEPROM, and SPI Bus
REGISTER NAME
AND ADDRESS
0x28
0x29
0x2A
0x2B
0x2C
0
1
1
0
0
0
0
B0
0
0
1
0
1
0
0
0
28
PHIMUL
PHI multiplier = 1 (register setting + 1)
0
0
0
0
0
0
0
0
00
PHIMAX
Although disabled, PHI max count is zero
0
0
0
0
0
0
0
0
00
0
0
0
0
0
0
0
0
00
1
0
0
0
1
0
0
1
89
0
0
0
0
0
0
0
1
01
Although disabled, global intensity set to (127 + 1) / 256 = 50%
(1 added in numerator because bit D7 of 0x2D = 1)
0
1
1
1
1
1
1
1
7F
Although disabled, Alternate global intensity set to (127 + 1) / 256 = 50%
(1 added in numerator because bit D7 of 0x2D = 1)
0
1
1
1
1
1
1
1
7F
Strings current globally scaled to 50% of RSn setting
0
1
1
1
1
1
1
1
7F
0
0
0
0
0
0
0
0
00
0
1
0
0
0
0
0
0
40
0
0
0
0
0
0
0
0
00
0
1
0
0
0
0
0
0
40
0
0
0
0
0
0
0
0
00
0
0
0
0
0
0
1
0
02
PWMCTRL1
0x2F
GINT
0x30
ALTGINT
0x31
ISTR
0x5F
0x60
0x61
0x7E
0x7F
0x80
0x81
0x9E
0x9F
0xA0
0xA1
0xBE
0xBF
REGISTER DATA
D5 D4 D3 D2 D1 D0 HEX
1
0x2E
0x5E
D6
Although disabled, internal PHI
frequency is set to 20MHz / (8 * (10416 + 1)) = 240Hz
PWMCTRL0
0x41
D7
PHICNTR
0x2D
0x40
POWER- UP CONDITION
REGISTERS INITIALIZED FROM E²PROM
STR0SET
…
STR15SET
PWM operation enabled
Individual LED string drive pulse widths internally determined
PWM input does not gate the output of the PWM engine
String on-times allowed to extend beyond end of PWM frame
String on-times not allowed to extend into frame zero
Alternate timing not used
Global intensity (GINT) disabled
Although disabled, (GINT + 1) is provided to the PWM engine
String drive phasing enabled
Delayed string turn-on beginning after PWM frame not allowed
Alternate timing not selected by PWM input state
All strings set to zero phase delay with strings assigned to FBO outputs
as follows:
FBO1: All Strings
FBO2: No Strings
PWM0
…
All strings set with PWM tON = 512 GSC cycles
PWM15
ALTSTR0SET
…
…
0
0
0
0
0
0
0
0
00
0
0
0
0
0
0
1
0
02
0
0
0
0
0
0
0
0
00
0
0
0
0
0
0
0
0
00
0
0
0
0
0
0
0
0
00
0
0
0
0
0
0
0
0
00
0
0
0
0
0
0
0
0
00
0
0
0
0
0
0
1
0
02
All strings set with alternate phase delay of zero
ALTSTR15SET
ALTPWM0
…
…
…
All strings set with Alternate PWM tON = 512 GSC cycles
…
0
0
0
0
0
0
0
0
00
0
0
0
0
0
0
1
0
02
E²PROM 7 bit address = 0x00
0
0
0
0
0
0
0
0
00
E²PROM read/write disabled
0
0
0
0
0
0
0
0
00
ALTPWM15
REGISTERS WITH FIXED INITIAL VALUES
0xC0
E2ADDR
0xC1
E2CTRLSTA
Atmel LED Driver-MSL2162
23
Atmel Corporation
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San Jose, CA 95131
USA
Tel: (+1)(408) 441-0311
Fax: (+1)(408) 487-2600
www.atmel.com
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GERMANY
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