MSL2160/61

MSL2160/61
Atmel LED Drivers
MSL2160/MSL2161
16-string, White and RGB LED Drivers with Adaptive Configuration,
EEPROM, and SPI/I2C/SMBus Serial Interface
Datasheet Brief
Atmel LED Drivers-MSL2160/MSL2161
16-string, White and RGB LED Drivers with Adaptive Configuration,
EEPROM, and SPI/I2C/SMBus Serial Interface
General Description
The Atmel® LED DriversMSL2160 and MSL2161
compact, high-power LED
string drivers use external
current control MOSFETs to
sink up to 350mA per string,
with current accuracy and
matching better than 1.5%.
The MSL2160/1 drive 16
parallel strings of LEDs, and
offer fault detection and
management of open and
short circuit LEDs.
The MSL2160 features a 20MHz SPI bus, and the MSL2161 offers a 1MHz
I2C serial interface. Both interfaces support video frame-by-frame LED string
intensity control for up to eight interconnected devices, allowing active area
dimming and phase shifted PWM dimming for improved performance. Both
devices include an advanced PWM engine that synchronizes PWM dimming
to the video signal for reduced motion blur and waterfall noise.
The MSL2160/1 adaptively controls the DC-DC converters that power the
LED strings using Atmel's Adaptive SourcePower™ technology. This scheme
optimizes power consumption without sacrificing LED current accuracy.
Peak LED string currents are set using current sense resistors, and global
string current is adjustable with 8-bit control. Global string drive pulse width
is adjusted with an 8-bit global intensity register, and individual string pulse
width is modulated with 12-bit control.
The MSL2160/1 monitors the LED strings for open circuit, short circuit, lossof-sync, and over-temperature faults, and provide a hardware fault output
to notify the MCU. Detailed fault status and control are available through the
serial interface. Additionally, the MSL2160/1 includes an on-chip EEPROM
that allows the power-up defaults to be customized via the serial interface.
The MSL2160/1 are offered in 9 x 9 x 0.85mm, 64-pin TQFN packages and
operate 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
PART
2
INTERFACE
PACKAGE
MSL2160DQ
SPI
64-pin, 9 x 9 x 0.85mm TQFN
MSL2161DQ
IC
64-pin, 9 x 9 x 0.85mm TQFN
2
Atmel LED Drivers-MSL2160/MSL2161
Atmel LED Drivers-MSL2160/MSL2161
16-string, White and RGB LED Drivers with Adaptive Configuration,
EEPROM, and SPI/I2C/SMBus Serial Interface
Key Features
• 12-bit PWM String Dimming
• Global Intensity Control via Serial Interface
• Fast Serial Interfaces Support up to 8 Devices
per Bus:
• ±1.5% Current Accuracy and Current Balance
- MSL2161 - 1MHz I2C
- MSL2160 - 20MHz SPI
• 8-bit Adaptive Power Correction Maximizes
Efficiency of up to Three String Power Supplies
• External 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 in LCD TVs and Monitors
• Programmable String Phase Reduces Motion
Blur and Improves Efficiency
• Flexible Video Frame (VSYNC) and Line (HSYNC)
Sync Include Frequency Multipliers and Dividers
• Second Set of PWM Registers Select Alternate
Brightness and Timing with Single Control
• EEPROM Saves Power-on Default Settings
• LED Open Circuit and Short Circuit Fault Detection
• Individual Fault Detection Enable for Each String
• Over-temperature Shut-off Protection
• Broadcast Write Simplifies Configuration
• -40°C To +105°C Operating Temperature Range
Application Circuit
Atmel LED Drivers-MSL2160/MSL2161
3
Atmel LED Drivers-MSL2160/61
Overview
The MSL2160/1 allows RGB LEDs to be driven by three
separate string supplies, and feature three independent
EO outputs to maximize the efficiency for each supply.
Although not required, it is wise to use this capability
even for single-color systems, such as white backlighting
LEDs in an LCD monitor or TV application.
The MSL2160/1 LED string controllers drive, monitor,
and dim multiple LEDs at high efficiency for LCD
backlighting and signage applications. This section
summarizes the capabilities of the MSL2160/1 for
quick evaluation.
Timing, PWM, Intensity Controls
and Synchronization
How Many LEDs and Drivers?
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 timing.
The MSL2160/1 controls 16 strings of seriesconnected LEDs at up to 350mA per string. Up to eight
MSL2160/1s 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
MSL2160/1. The MSL2160/1 FET gate drive outputs
are optimized for FETs requiring up to 10nC of charge.
LEDs, String Power Supplies
and Efficiency Optimizers (EOs)
The MSL2160/1 also includes easily controlled internal
PWM timing generation for stand alone (non-video)
LED lighting applications that do not provide external
timing sources. One MSL2160/1 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.
The MSL2160/1 Efficiency Optimizer (EO) circuits
dynamically adjust up to three 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.
Table 1. LED Common Backlight Drive Architectures and Features
BACKLIGHT TYPE
4
MOTION BLUR REMOVAL
AREA DIMMING MANAGEMENT
White LED - bottom edge-lit
No
No
White LED - top/bottom edge-lit
No
No
White LED - four 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
STRING SUPPLY
OPTIONS
Up to three efficiency
optimized power supplies
Three efficiency optimized
power supplies
Atmel LED Drivers-MSL2160/MSL2161
Atmel LED Drivers-MSL2160/MSL2161
16-string, White and RGB LED Drivers with Adaptive Configuration,
EEPROM, and SPI/I2C/SMBus Serial Interface
Table 2. Timing and LED Intensity Control Capability
LED INTENSITY CONTROL
RESOLUTION
Global LED string current adjust
8-bits DAC reduces string current globally from maximum set by global resistor
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
D1
G1
S1
D0
G0
S0
VDD
VIN
EN
56
55
54
53
52
51
50
49
EN
S2
VIN
49
57
VDD
50
G2
S0
51
58
G0
52
D2
D0
53
59
S1
54
S3
G1
55
60
D1
56
G3
S2
57
61
G2
58
D3
D2
59
62
S3
60
S4
G3
61
64
D3
62
63
S4
64
63
Package Pin-out
G4
1
48
PWM
G4
1
48
PWM
D4
2
47
GSC
D4
2
47
GSC
PHI
S5
3
46
PHI
S5
3
46
G5
4
45
VCC
G5
4
45
VCC
D5
5
44
D15
D5
5
44
D15
G15
S6
6
43
G15
S6
6
43
G6
7
42
S15
G6
7
42
S15
D6
8
41
D14
D6
8
41
D14
S7
9
G7
10
MSL2161
40
G15
S7
9
39
S14
G7
10
MSL2160
40
G15
39
S14
Figure 1. Atmel LED Driver-MSL2161 Pin-out, 64-pin TQFN.
Atmel LED Drivers-MSL2160/MSL2161
19
20
21
22
23
24
25
26
27
28
29
30
31
32
FBO2
FBO1
S8
G8
D8
S9
G9
D9
S10
G10
D10
S11
G11
D11
S12
18
33
17
16
FBO3
FLTB
ADDR
S12
32
33
D11
16
31
G12
FLTB
G11
34
30
15
S11
CSB
29
G12
D10
34
28
15
G10
D12
GND
27
35
S10
14
26
SCK
D9
D12
25
35
G9
14
24
S13
SCL
S9
36
23
13
D8
MOSI
22
S13
G8
36
21
13
S8
G13
SDA
20
D13
37
FBO1
38
12
19
11
MISO
FBO2
D7
G13
18
D13
37
17
38
12
FBO3
11
ADDR
D7
NC
Figure 2. Atmel LED Driver-MSL2160 Pin-out, 64-pin TQFN.
5
Figure 3. Package Dimensions: 64-pin, 9mm x 9mm x 0.85mm TQFN (0.5mm pin pitch) with Exposed Pad.
6
Atmel LED Drivers-MSL2160/MSL2161
Atmel LED Drivers-MSL2160/MSL2161
16-string, White and RGB LED Drivers with Adaptive Configuration,
EEPROM, and SPI/I2C/SMBus Serial Interface
Atmel LED Drivers-MSL2160/MSL2161
7
Package Pin Descriptions
Table 3. Pin Assignments
PIN
MSL2161
MSL2160
PIN DESCRIPTION
1
G4
G4
Gate output 4
Gate drive output for external MOSFET 4.
Connect G4 to the gate of the external MOSFET driving LED string 4.
If unused, leave G4 unconnected.
2
D4
D4
Drain sense input 4
Drain sense input for external MOSFET 4.
Connect D4 through a 10MΩ resistor to the drain of the external MOSFET driving LED string 4.
If unused, connect D4 to ground.
S5
Source sense input 5
Source sense input for external MOSFET 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 reached when 500mV is across the current sense resistor.
If unused, connect S5 to ground.
G5
Gate output 5
Gate drive output for external MOSFET 5.
Connect G5 to the gate of the external MOSFET driving LED string 5.
If unused, leave G5 unconnected.
D5
Drain sense input 5
Drain sense input for external MOSFET 5.
Connect D5 through a 10MΩ resistor to the drain of the external MOSFET driving LED string 5.
If unused, connect D5 to ground.
S6
Source sense input 6
Source sense input for external MOSFET 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 reached when 500mV is across the current sense resistor.
If unused, connect S6 to ground.
G6
Gate output 6
Gate drive output for external MOSFET 6.
Connect G6 to the gate of the external MOSFET driving LED string 6.
If unused, leave G6 unconnected.
D6
Drain sense input 6
Drain sense input for external MOSFET 6.
Connect D6 through a 10MΩ resistor to the drain of the external MOSFET driving LED string 6.
If unused, connect D6 to ground.
S7
Source sense input 7
Source sense input for external MOSFET 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 reached when 500mV is across the current sense resistor.
If unused, connect S7 to ground.
G7
Gate output 7
Gate drive output for external MOSFET 7.
Connect G7 to the gate of the external MOSFET driving LED string 7.
If unused, leave G7 unconnected.
3
4
5
6
7
8
9
10
8
PIN NAME
S5
G5
D5
S6
G6
D6
S7
G7
Atmel LED Drivers-MSL2160/MSL2161
Atmel LED Drivers-MSL2160/MSL2161
16-string, White and RGB LED Drivers with Adaptive Configuration,
EEPROM, and SPI/I2C/SMBus Serial Interface
PIN
11
12
13
14
PIN NAME
MSL2161
D7
NC
SDA
SCL
PIN DESCRIPTION
MSL2160
D7
MISO
MOSI
SCK
Drain sense input 7
Drain sense input for external MOSFET 7.
Connect D7 through a 10MΩ resistor to the drain of the external MOSFET driving LED string 7.
If unused, connect D7 to ground.
MSL2161: No connect
Make no connection to NC.
MSL2160: Master input slave output
MISO is the SPI serial data output.
MSL2161: I²C serial data I/O
SDA is the data I/O for the I²C serial interface.
MSL2160: Master output slave input
MOSI is the SPI serial data input.
MSL2161: I²C serial clock input
SCL is the clock input for the I²C serial interface.
MSL2160: SPI serial shift clock
SCK is the clock input for the SPI bus.
MSL2161: Ground
Connect GND to system ground and to EP with short, wide traces.
15
GND
CSB
16
FLTB
FLTB
Fault indication output (active low)
Open drain output FLTB sinks current to GND whenever a fault is detected and verified.
FLTB remains low until the fault registers are read, and reasserts if the fault persists.
17
ADDR
ADDR
Slave ID selection inputs
Connect ADDR to GND through a resistor to set the device address for the serial interface.
18
FBO3
FBO3
Efficiency Optimizer output 3
Connect FBO3 to the third power supply’s feedback node.
Connect FBO3 to GND if unused.
19
FBO2
FBO2
Efficiency Optimizer output 2
Connect FBO2 to the second power supply’s feedback node. Connect FBO2 to GND if unused.
20
FBO1
FBO1
Efficiency Optimizer output 1
Connect FBO1 to the first power supply’s feedback node. Connect FBO1 to GND if unused.
MSL2160: Chip select bar
CSB is the chip select input for SPI transactions. CSB is active low.
21
S8
S8
Source sense input 8
Source sense input for external MOSFET 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 reached when 500mV is across the current sense resistor.
If unused, connect S8 to ground.
22
G8
G8
Gate output 8
Gate drive output for external MOSFET 8.
Connect G8 to the gate of the external MOSFET driving LED string 8.
If unused, leave G8 unconnected.
D8
Drain sense input 8
Drain sense input for external MOSFET 8.
Connect D8 through a 10MΩ resistor to the drain of the external MOSFET driving LED string 8.
If unused, connect D8 to ground.
23
D8
Atmel LED Drivers-MSL2160/MSL2161
9
Table 3. Pin Assignments
PIN
24
25
26
27
28
29
30
31
32
33
34
10
PIN NAME
MSL2161
S9
G9
D9
S10
G10
D10
S11
G11
D11
S12
G12
MSL2160
PIN DESCRIPTION
S9
Source sense input 9
Source sense input for external MOSFET 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 reached when 500mV is across the current sense resistor.
If unused, connect S9 to ground.
G9
Gate output 9
Gate drive output for external MOSFET 9.
Connect G9 to the gate of the external MOSFET driving LED string 9.
If unused, leave G9 unconnected.
D9
Drain sense input 9
Drain sense input for external MOSFET 9.
Connect D9 through a 10MΩ resistor to the drain of the external MOSFET driving LED string 9.
If unused, connect D9 to ground.
S10
Source sense input 10
Source sense input for external MOSFET 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 reached when 500mV is across the current sense resistor.
If unused, connect S10 to ground.
G10
Gate output 10
Gate drive output for external MOSFET 10.
Connect G10 to the gate of the external MOSFET driving LED string 10.
If unused, leave G10 unconnected.
D10
Drain sense input 10
Drain sense input for external MOSFET 10.
Connect D10 through a 10MΩ resistor to the drain of the external MOSFET driving LED string 10.
If unused, connect D10 to ground.
S11
Source sense input 11
Source sense input for external MOSFET 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 reached when 500mV is across the current sense resistor.
If unused, connect S11 to ground.
G11
Gate output 11
Gate drive output for external MOSFET 11.
Connect G11 to the gate of the external MOSFET driving LED string 11.
If unused, leave G11 unconnected.
D11
Drain sense input 11
Drain sense input for external MOSFET 11.
Connect D11 through a 10MΩ resistor to the drain of the external MOSFET driving LED string 11.
If unused, connect D11 to ground.
S12
Source sense input 12
Source sense input for external MOSFET 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 reached when 500mV is across the current sense resistor.
If unused, connect S12 to ground.
G12
Gate output 12
Gate drive output for external MOSFET 12.
Connect G12 to the gate of the external MOSFET driving LED string 12.
If unused, leave G12 unconnected.
Atmel LED Drivers-MSL2160/MSL2161
Atmel LED Drivers-MSL2160/MSL2161
16-string, White and RGB LED Drivers with Adaptive Configuration,
EEPROM, and SPI/I2C/SMBus Serial Interface
PIN
35
36
37
38
39
40
41
42
43
PIN NAME
MSL2161
D12
S13
G13
D13
S14
G14
D14
S15
G15
MSL2160
PIN DESCRIPTION
D12
Drain sense input 12
Drain sense input for external MOSFET 12.
Connect D12 through a 10MΩ resistor to the drain of the external MOSFET driving LED string 12.
If unused, connect D12 to ground.
S13
Source sense input 13
Source sense input for external MOSFET 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 reached when 500mV is across the current sense resistor.
If unused, connect S13 to ground.
G13
Gate output 13
Gate drive output for external MOSFET 13.
Connect G13 to the gate of the external MOSFET driving LED string 13.
If unused, leave G13 unconnected.
D13
Drain sense input 13
Drain sense input for external MOSFET 13.
Connect D13 through a 10MΩ resistor to the drain of the external MOSFET driving LED string 13.
If unused, connect D13 to ground.
S14
Source sense input 14
Source sense input for external MOSFET 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 reached when 500mV is across the current sense resistor.
If unused, connect S14 to ground.
G14
Gate output 14
Gate drive output for external MOSFET 14.
Connect G14 to the gate of the external MOSFET driving LED string 14.
If unused, leave G14 unconnected.
D14
Drain sense input 14
Drain sense input for external MOSFET 14.
Connect D14 through a 10MΩ resistor to the drain of the external MOSFET driving LED string 14.
If unused, connect D14 to ground.
S15
Source sense input 15
Source sense input for external MOSFET 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 reached when 500mV is across the current sense resistor.
If unused, connect S15 to ground.
G15
Gate output 15
Gate drive output for external MOSFET 15.
Connect G15 to the gate of the external MOSFET driving LED string 15.
If unused, leave G15 unconnected.
44
D15
D15
Drain sense input 15
Drain sense input for external MOSFET 15.
Connect D15 through a 10MΩ resistor to the drain of the external MOSFET driving LED string 15.
If unused, connect D15 to ground.
45
VCC
VCC
5V internal LDO regulator output
VCC powers the FBO outputs.
Bypass VCC to GND with a 4.7µF ceramic capacitor placed close to VCC.
Atmel LED Drivers-MSL2160/MSL2161
11
Table 3. Pin Assignments
PIN
PIN DESCRIPTION
MSL2161
MSL2160
46
PHI
PHI
Phase synchronization input
Drive PHI with an external signal from 40Hz to 10kHz to synchronize the MSL2160/1 clock.
PHI is typically driven with the VSYNC signal.
47
GSC
GSC
Gate shift clock input
Drive GSC with the gate shift clock of the video signal, from to MHz.
GSC is typically driven with the HSYNC signal.
48
PWM
PWM
PWM input
PWM allows external control of the brightness of all LED strings.
Drive PWM with a pulse-width modulated signal with duty cycle ranging from 0% to 100% and
frequency up to 5kHz. When not configured as an input, PWM is high impedance.
49
EN
EN
Enable input (active high)
Drive EN high to turn on the MSL2160/1, drive EN low to turn off the MSL2160/1.
For automatic start up, connect EN to VIN.
When EN is low the entire device, including the serial interface, is turned off.
Driving EN high initiates a boot load of the EEPROM data into the control registers,
simulating a cold start up.
50
VIN
VIN
Supply voltage input
Connect a 12V ±10% supply to VIN. Bypass VIN to GND with a 10µF
ceramic capacitor placed close to VIN.
51
VDD
VDD
2.5V internal LDO regulator output
VDD powers internal logic.
Bypass VDD to GND with a 4.7µF ceramic capacitor placed close to VDD.
52
53
54
55
56
12
PIN NAME
S0
G0
D0
S1
G1
S0
Source sense input 0
Source sense input for external MOSFET 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 reached when 500mV is across the current sense resistor.
If unused, connect S0 to ground.
G0
Gate output 0
Gate drive output for external MOSFET 0.
Connect G0 to the gate of the external MOSFET driving LED string 0.
If unused, leave G0 unconnected.
D0
Drain sense input 0
Drain sense input for external MOSFET 0.
Connect D0 through a 10MΩ resistor to the drain of the external MOSFET driving LED string 0.
If unused, connect D0 to ground.
S1
Source sense input 1
Source sense input for external MOSFET 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 reached when 500mV is across the current sense resistor.
If unused, connect S1 to ground.
G1
Gate output 1
Gate drive output for external MOSFET 1.
Connect G1 to the gate of the external MOSFET driving LED string 1.
If unused, leave G1 unconnected.
Atmel LED Drivers-MSL2160/MSL2161
Atmel LED Drivers-MSL2160/MSL2161
16-string, White and RGB LED Drivers with Adaptive Configuration,
EEPROM, and SPI/I2C/SMBus Serial Interface
PIN
57
58
59
60
61
62
63
PIN NAME
MSL2161
D1
S2
G2
D2
S3
G3
D3
MSL2160
PIN DESCRIPTION
D1
Drain sense input 1
Drain sense input for external MOSFET 1.
Connect D1 through a 10MΩ resistor to the drain of the external MOSFET driving LED string 1.
If unused, connect D1 to ground.
S2
Source sense input 2
Source sense input for external MOSFET 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 reached when 500mV is across the current sense resistor.
If unused, connect S2 to ground.
G2
Gate output 2
Gate drive output for external MOSFET 2.
Connect G2 to the gate of the external MOSFET driving LED string 2.
If unused, leave G2 unconnected.
D2
Drain sense input 2
Drain sense input for external MOSFET 2.
Connect D2 through a 10MΩ resistor to the drain of the external MOSFET driving LED string 2.
If unused, connect D2 to ground.
S3
Source sense input 3
Source sense input for external MOSFET 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 reached when 500mV is across the current sense resistor.
If unused, connect S3 to ground.
G3
Gate output 3
Gate drive output for external MOSFET 3.
Connect G3 to the gate of the external MOSFET driving LED string 3.
If unused, leave G3 unconnected.
D3
Drain sense input 3
Drain sense input for external MOSFET 3.
Connect D3 through a 10MΩ resistor to the drain of the external MOSFET driving LED string 3.
If unused, connect D3 to ground.
64
S4
S4
Source sense input 4
Source sense input for external MOSFET 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 reached when 500mV is across the current sense resistor.
If unused, connect S4 to ground.
EP
EP
EP
Exposed pad, power ground
EP is the thermal relief pad for the device.
Connect EP to system ground and GND using short, wide traces.
Atmel LED Drivers-MSL2160/MSL2161
13
Absolute Maximum Ratings
Voltage (With Respect to GND)
VIN, EN, D0 - D15............................................................................................................................................................. -0.3V to +16V
G0 - G15............................................................................................................................................................... -0.3V to (VIN + 0.3V)
VDD.............................................................................................................................................................................................-0.3V to +2.75V
ADDR, S0 - S15.............................................................................................................................................-0.3V to (VDD + 0.3V)
FLTB, SDA, SCL, SCK......................................................................................................................................................-0.3V to +5.5V
FBO1, FBO2, FBO3, PHI, GSC, PWM, MOSI, MISO, CSB..........................................-0.3V to (VCC + 0.3V)
VCC......................................................................................................................................................................................................-0.3V to +6V
EP......................................................................................................................................................................................................-0.3V to +0.3V
Current (Into Pin)
VIN.................................................................................................................................................................................................................... 500mA
FBO1, FBO2, FBO3....................................................................................................................................................+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
14
Atmel LED Drivers-MSL2160/MSL2161
Atmel LED Drivers-MSL2160/MSL2161
16-string, White and RGB LED Drivers with Adaptive Configuration,
EEPROM, and SPI/I2C/SMBus Serial Interface
Electrical Characteristics
Typical Application Circuit, VVIN = 12V, TA = TMIN to TMAX, unless otherwise noted. Typical values are TA = +25°C
PARAMETER
SYMBOL
CONDITIONS AND NOTES
MIN
TYP
MAX
UNIT
10.8
12
13.2
V
All LED strings on 50%
duty cycle
15
30
All LED strings on 100%
duty cycle
30
70
VIN Shutdown Supply Current
EN = GND
500
µA
VIN Sleep Supply Current
SLEEP = 1, SDA, SCL,
ADDR, PWM, PHI and GSC
at GND or VDD
2.75
mA
DC ELECTRICAL CHARACTERISTICS
VIN Operating Supply Voltage
VIN Operating Supply Current
mA
VCC Regulation Voltage
4.5
5.0
5.5
V
VDD Regulation Voltage
2.4
2.5
2.6
V
EN Input High Voltage
1.8
V
EN Input Low Voltage
0.9
PWM, PHI, GSC, Input High Voltage
0.7 x VVDD
V
0.3 x
VVDD
PWM, PHI, GSC, Input Low Voltage
PHI, GSC Output High Voltage
ISOURCE = 5mA
PHI, GSC, FLTB Output Low Voltage
ISINK = 6mA
FBO1 - FBO3 Feedback Output Current
FBOn DAC = 0xFF, VFBOn = 0
FBO1 - FBO3 Feedback Output Current Step
INCRSTEP[0:1] = 00,
DECRSTEP[0:1] = 00
V
V
VVDD – 0.4
208
306
0.4
V
360
µA
1.2
μA
D0 - D15 Short Circuit Fault
Detection Threshold
8
V
G0 - G15 Open Circuit Fault
Detection Threshold
8
V
G0 - G15 Maximum Gate Drive Current
0.7
mA
G0 - G15 Maximum Gate Drive Voltage
VVIN – 2.5
V
S0 - S15 Regulation Voltage
S0 - S15 Voltage Accuracy
S0 - S15 Regulation Voltage Matching
Thermal Shutdown Temperature
Atmel LED Drivers-MSL2160/MSL2161
ISTR = 0xFF
475
ISTR = 0x7F, TA = +25°C
-1.5
+1.5
-4
+4
ISTR = 0x7F, TA = +25°C, 1st
string to all others
-0.5
+0.5
ISTR = 0x7F, string to average
of all strings
-1.5
+1.5
ISTR = 0x7F
Temperature rising, hysteresis
= 15°C (Note 1)
500
525
mV
%
%
135
°C
15
PARAMETER
SYMBOL
CONDITIONS AND NOTES
MIN
TYP
MAX
UNIT
SPI LOGIC LEVELS, MSL2160
0.7 x
VVDD
MOSI, SCK, CSB Input High Voltage
V
0.3 x
VVDD
MOSI, SCK, CSB Input Low Voltage
MISO Output High Voltage
ISOURCE = 5mA
MISO Output Low Voltage
ISINK = 6mA
PARAMETER
SYMBOL
CONDITIONS AND NOTES
VVCC –
0.4
MIN
V
V
TYP
0.4
V
MAX
UNIT
I2C LOGIC LEVELS, MSL2161
0.7 x
VVDD
SDA, SCL Input High Voltage
V
SDA, SCL Input Low Voltage
ISINK = 6mA
SDA Output Low Voltage
PARAMETER
SYMBOL
CONDITIONS AND NOTES
0.3 x
VVDD
V
0.4
V
MIN
TYP
MAX
UNIT
19.4
20
20.6
MHz
0.04
10
kHz
fPHI
2.5
MHz
AC ELECTRICAL CHARACTERISTICS
Internal Oscillator Frequency
fOSC
PHI Frequency
fPHI
GSC Frequency
GSCMUL = 0, GSCDIV = 0 (Note 9)
PWM Frequency
PWM Duty Cycle
PARAMETER
OSCFREQ = 0x04, TA = 25°C
EXTALTEN = 0 (Note 1)
5
EXTALTEN = 1 (Note 1)
1
(Note 1, Note 9)
SYMBOL
CONDITIONS AND NOTES
0
MIN
TYP
kHz
100
%
MAX
UNIT
20
MHz
SPI TIMING CHARACTERISTICS, MSL2160
SCK Frequency
CSB to Rising Edge of SCK Setup Time
tCSB:SCK(SU)
20
ns
Rising Edge of SCK to CSB Hold Time
tCSB:SCK(HD)
20
ns
MOSI to Rising Edge of SCK Setup Time
tMOSI(SU)
20
ns
Rising Edge of SCK to MOSI Hold Time
tMOSI(HD)
20
ns
CSB Falling Edge to MISO Data Valid
tCSB:MISO(DV)
CSB Rising Edge to MISO High Impedance
tCSB:MISO(HIZ)
16
(Note 1)
50
ns
50
ns
Atmel LED Drivers-MSL2160/MSL2161
Atmel LED Drivers-MSL2160/MSL2161
16-string, White and RGB LED Drivers with Adaptive Configuration,
EEPROM, and SPI/I2C/SMBus Serial Interface
PARAMETER
SCK Falling Edge to MISO Data Valid
SYMBOL
tVALID
CONDITIONS AND NOTES
MIN
TYP
(Note 1)
MAX
UNIT
20
ns
SCK High Time
20
ns
SCK Low Time
20
ns
MOSI, CSB, SCK Signal Rise Time
tR(SPI)
Receiving (Note 6)
5.0
MOSI, CSB, SCK Signal Fall Time
tF(SPI)
ns
Receiving (Note 6)
5.0
ns
MISO Signal Rise Time
Cload = 10pF (Note 6)
20
ns
MISO Signal Fall Time
Cload = 10pF (Note 6)
20
ns
PARAMETER
SYMBOL
CONDITIONS AND NOTES
MIN
TYP
MAX
UNIT
1
MHz
31
ms
I²C TIMING CHARACTERISTICS, MSL2161
SCL Clock Frequency
1/tSCL
Bus Timeout Period
ttimeout
I2CTOEN = 0 (Note 2)
0
fOSC = 20MHz, TA = 25°C
29
fOSC = 16MHz to 23MHz
30
600,000 / fOSC
s
tBUF
0.5
µs
tHD:STA
0.26
µs
Repeated START condition Setup Time
tSU:STA
0.26
µs
STOP Condition Setup Time
tSU:STOP
0.26
µs
SDA Data Hold Time
tHD:DAT
0
ns
SDA Data Valid Acknowledge Time
tVD:ACK
(Note 3)
0.05
0.45
µs
SDA Data Valid Time
tVD:DAT
(Note 4)
0.05
0.45
µs
SDA Data Set-Up Time
tSU:DAT
100
ns
SCL Clock Low Period
tLOW
0.5
µs
SCL Clock High Period
tHIGH
0.26
µs
STOP to START Condition Bus Free Time
Repeated START condition Hold Time
SDA, SCL Fall Time
tf
SDA, SCL Rise Time
tr
SDA, SCL Input Suppression Filter Period
tSP
(Note 1, Note 5, Note 6)
(Note 2, Note 7)
50
120
ns
120
ns
ns
Note 1. Guaranteed by design, not production tested.
Note 2. Minimum SCL clock frequency is limited by the bus timeout feature, which resets the serial bus interface if either SDA or SCL is held low for
time-out. Disable bus timeout via the Fault Enable register 0x03[D6].
Note 3. tV D:AC K = SCL LOW to SDA (out) LOW acknowledge time.
Note 4. tV D:DAT = minimum SDA output data-valid time following SCL LOW transition.
Note 5. A master device must internally provide an SDA hold time of at least 300ns to ensure an SCL low state.
Note 6. The maximum SDA, SCL and MOSI rise times are 300ns. This allows series protection resistors to be connected between these inputs and
the bus lines without exceeding the maximum allowable rise time. The maximum SDA and MISO fall time is 250ns.
Note 7. The MSL2161 includes input filters on SDA, SCL and ADDR inputs that suppress noise less than 50ns.
Note 8. The GSC input frequency multiplied by (GSCMUL + 1) should not exceed 2.5MHz.
Note 9. When PWMDIRECT = 1 and PHDLYEN = 1 (external PWM with auto phase shift enabled), PWM duty cycles at 0% and 100% are guaranteed,
other duty cycles require minimum on or off time of one full internal oscillator clock cycle and frequency greater than (fOSC/106)Hz.
Atmel LED Drivers-MSL2160/MSL2161
17
Typical Application Circuit
Figure 4. Atmel LED Driver-MSL2161 Driving 160 White LEDs in 16 Strings
18
Atmel LED Drivers-MSL2160/MSL2161
Atmel LED Drivers-MSL2160/MSL2161
16-string, White and RGB LED Drivers with Adaptive Configuration,
EEPROM, and SPI/I2C/SMBus Serial Interface
Detailed Description
The MSL2160 and MSL2161 are highly integrated,
flexible, multi-string LED drivers that use external
MOSFETs to allow high LED string currents, and include
power supply control to maximize efficiency. The drivers
optionally connect to a video subsystem to offer a simple
architecture for use in LCD TV backlight applications. Up
to eight devices can be cascaded together to drive large
numbers of LED strings in a system. The drivers provide
multiple methods of controlling LED brightness through
both peak current control and 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 EEPROM holds
all the default control register values. At power-up, the
data in the EEPROM are automatically copied directly to
the control registers, setting up the device for operation.
The factory programmed EEPROM values can be
changed through the serial interface if a different powerup condition is desired.
The PWM frequency of the drivers is either synchronized
to an external signal applied to PHI, generated from
the internal oscillator for standalone applications, or
set directly by a signal at the PWM input. 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 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 onchip PWM generator. The actual resolution of the PWM
frequency depends 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 devices interface to an MCU via I2C (MSL2161)
or SPI (MSL2160). The robust 1MHz I2C interface
supports up to eight devices on the bus. The 20MHz,
bus-addressable SPI bus supports up to eight devices
per chip select line. While typically the LED drive PWM
signal is internally generated, both drivers also accept
an external direct PWM drive signal applied to the
PWM input that sets the PWM duty and the frequency
of the LEDs drive signal. Both devices also feature
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 Efficiency Optimizers control a wide range of
different external DC-DC and AC-DC converter
architectures. Multiple drivers in a system communicate
in real time among themselves 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 concern about excessive power
dissipation issues. During the start-up sequence, the
MSL2160/1 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 in LED forward voltage, and to
assure continued optimum power savings.
Atmel LED Drivers-MSL2160/MSL2161
19
Internal Regulators and Enable Input
The MSL2160/1 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 GND with a 10µF capacitor close to the device. Bypass
VCC to GND with a 4.7µF capacitor close to the device. Bypass VDD to GND with a 4.7µF capacitor close to the device.
The MSL2160/1 enables 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, the Efficiency Optimizer is disabled,
and all strings are turned off. Drive EN high to turn on the device. When EN is driven high, the contents of the EEPROM
are boot loaded into the control registers, simulating a cold start up, and all bits in the fault registers are cleared to 0.
Setting the Maximum LED String Current with a 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:
RS =
0 .5 , where I is in amperes and R is in ohms.
LED
S
I LED
For example, a full-scale LED current of 100mA returns RS = 5Ω. The current for all LED strings is reduced
from the full-scale value with 8-bit resolution using ISTR, the string current control register 0x31.
Figure 5. FBOn Connects to the Power Supply Voltage Divider Through a Diode.
20
Atmel LED Drivers-MSL2160/MSL2161
Atmel LED Drivers-MSL2160/MSL2161
16-string, White and RGB LED Drivers with Adaptive Configuration,
EEPROM, and SPI/I2C/SMBus Serial Interface
Connecting the Efficiency Optimizer to an LED String Power Supply and Selecting Resistors
The MSL2160/1 are designed to control external LED string power supplies that use voltage dividers (RTOP and RBOTTOM
in Figure 5) to set the output voltage, and whose regulation feedback voltage is not more than 3.5V. The Efficiency
Optimizer improves power efficiency by injecting a current of between 0 and 255µA into the voltage dividers of the
external power supplies, dynamically adjusting their outputs to the minimum voltage required by the LED strings. To
select the resistors, first determine VOUT(MIN) and VOUT(MAX), the minimum and maximum string supply voltage limits, using:
VOUT ( MIN ) = (V f ( MIN ) ∗ [# ofLEDs ])+ 0.5
and
VOUT ( MAX ) = (V f ( MAX ) ∗ [# ofLEDs ])+ 0.5 ,
where Vf(MIN) and Vf(MAX) are the LED minimum and maximum forward voltage drops at the peak current set by RS (page
12). 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 drops across a string are 35V and 38V, respectively. Adding an allowance of 0.5V 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:
R BOTTOM = RTOP ∗
V FB
VOUT ( MAX ) − VFB ,
where VFB is the regulation feedback voltage of the power supply. Place a diode (1N4148 or similar) between FBOn and
the supply’s feedback node to protect the MSL2160/1 against current flow into FBOn. Assign all strings powered by a
common supply to the proper FBO output using string set registers 0x40 - 0x5F.
Once configured, determine the change in power supply output voltage in response to a change in FBO output current using:
∆VOUT = ∆I FBO ∗ RTOP .
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.
The PWM input can also be configured as a gate for the output of the PWM engine using PWM global enable
(bit D2 of the PWM control register 0x2D).
Atmel LED Drivers-MSL2160/MSL2161
21
Register Map and the EEPROM
Register Map Summary
Control the MSL2160/1 using the registers in the range 0x00 - 0xBF (Table 4). Two additional registers, 0xC0 and
0xC1, allow access to, and programming of, the EEPROM. The power-up default values for all control registers are stored
within the on-chip EEPROM, and any of these EEPROM values may be changed through the serial interface.
Table 4. Atmel LED Drivers-MSL2160/1 Register Map
ADDRESS AND
REGISTER NAME
0x00
STRINGEN0
0x01
0x02
FUNCTION
REGISTER DATA
D7
D6
D5
D4
D3
D2
D1
D0
STR3EN
STR2EN
STR1EN
STR0EN
STR10EN
STR9EN
STR8EN
STR7EN
STR6EN
STR5EN
STR4EN
STRINGEN1
LED string
enables
STR15EN
STR14EN STR13EN
CONFIG
Configuration
SLEEP
0x03
FLTEN
Fault enable
0x04
FLTMASK0
STR12EN
STR11EN
-
-
-
FLDBKEN
-
-
I2CTOEN
PHIMAXFEN
GSCMAXFEN
STRSCFEN
STROCFEN
FBOOCFEN
FEN7
FEN6
FEN5
FEN4
FEN3
FEN2
FEN1
FEN0
STRSCDLY[2:0]
0x05
FLTMASK1
String fault
mask
FEN15
FEN14
FEN13
FEN12
FEN11
FEN10
FEN9
FEN8
0x06
FLTSTATUS*
Fault status
FLTBDRV
-
-
PHIMAXFLT
GSCMAXFLT
STRSCFLT
STROCFLT
FBOOCFLT
0x07
OCSTAT0*
OC7
OC6
OC5
OC4
OC3
OC2
OC1
OC0
0x08
OCSTAT1*
String open
circuit fault
status
OC15
OC14
OC13
OC12
OC11
OC10
OC9
OC8
0x09
SCSTAT0*
SC7
SC6
SC5
SC4
SC3
SC2
SC1
SC0
0x0A
SCSTAT1*
SC15
SC14
SC13
SC12
SC11
SC10
SC9
SC8
String short
circuit fault
status
0x0B - 0x0E
0x0F
OSCFREQ
0x10
FBOCTRL0
0x11
FBOCTRL1
0x12
FBOCTRL2
0x13
FBODAC1*
0x14
FBODAC2*
0x15
FBODAC3*
0x16
FBOSTATUS*
UNUSED
Oscillator
frequency
Efficiency
optimizer
control
-
-
-
-
HDRMSTEP[1:0]
RECALDLY[1:0]
INCRSTEP[1:0]
DECRSTEP[1:0]
-
-
-
GSC
processing
control
GSCCNTR
Internal clock
counter for
GSC
0x23
GSCMUL
GSC
multiplier
0x24
GSCDIV
GSC divider
0x22
22
ACAL100
ACALEN
ICHKDIS
FBO3OCEN
FBO2OCEN
FBO1OCEN
FBOEN
FBO1ACT
FBOCAL
FBOINITCAL
GSCPOL
GSCPHISYNCEN
GSCINTEN
FBODAC2[7:0]
FBODAC3[7:0]
FBO3OC
FBO2OC
FBO1OC
FBO3ACT
FBO2ACT
UNUSED
GSCCTRL
0x21
IERRCONF[1:0]
INITPWM
FBODAC1[7:0]
0x17- 0x1F
0x20
OSCFREQ[2:0]
SETTLE[1:0]
-
Efficiency
optimizer
DAC
readback
Efficiency
optimizer
status
-
GSCCHKSEL
-
-
-
GSCMAXEN
GSCCNTR[7:0]
GSCCNTR[15:8]
-
-
-
GSCMUL[4:0]
GSCDIV[7:0]
Atmel LED Drivers-MSL2160/MSL2161
Atmel LED Drivers-MSL2160/MSL2161
16-string, White and RGB LED Drivers with Adaptive Configuration,
EEPROM, and SPI/I2C/SMBus Serial Interface
ADDRESS AND
REGISTER NAME
GSCMAX
Max oscillator
cycles
between
GSC pulses
PHICTRL
PHI
processing
control
PHICNTR
Internal clock
counter for
PHI
PHIMUL
PHI multiplier
PHIMAX
Max GSC
cycles
between PHI
pulses
0x25
0x26
0x27
0x28
0x29
0x2A
0x2B
0x2C
0x2D
FUNCTION
PWMCTRL0
REGISTER DATA
D7
D6
D5
D4
D3
PHICHKSEL
-
-
-
-
-
-
PHIMAX[7:0]
PHIMAX[15:8]
GINT+1EN
GINTEN
ALTEN
OVRFLOZEN
OVRFLOEN
PWMGLBLEN
PWMDIRECT
PWMEN
-
-
-
-
EXTALTEN
PHOVRFLOZEN
PHOVRFLOEN
PHADLYEN
Global PWM
scaling
GINT[7:0]
0x30
ALTGINT
Alternate
global PWM
scaling
ALTGINT[7:0]
0x31
ISTR
8-bit global
string current
scaling
ISTR[7:0]
0x32
PWMSTATUS*
PWM and
counter
status
0x33
PHIPCNTR*
PHI pulse
counter and
status
GSCPCNTR*
GSC pulse
counter
PHIMAXERRCNT[2:0]
PHICNTRMAX
-
PHIMAX1FLT
0x5F
0x60
0x61
PHISIGFLT
-
GSCSIGFLT
PHICNTRFLT
GINTMULERR
PHIPCNTR[4:0]
GSCPULSECNTR[7:0]
-
-
-
GSCPULSECNTR[12:8]
0x36 - 0x3F
UNUSED
STR0SET
Phase delay
and EO
assignment
for string 0
↓
↓
↓
Phase delay
and EO
assignment
for string 15
PHDLY15[7:0]
STR15SET
PWM0
PWM setting
for string 0
0x5E
PHIINTEN
PHIMUL[4:0]
GINT
↓
PHIPOL
PHICNTR[15:8]
0x2F
0x41
PHIMAXEN
PHICNTR[7:0]
PWMCTRL1
0x40
D0
GSCMAX[15:8]
0x2E
0x35
D1
GSCMAX[7:0]
PWM control
0x34
D2
Atmel LED Drivers-MSL2160/MSL2161
PHDLY0[7:0]
FBOSET0[1:0]
FBOSET15[1:0]
-
-
-
PHDLY[11:8]
-
PHDLY[11:8]
PWM0[7:0]
-
-
-
-
PWM0[11:8]
23
ADDRESS AND
REGISTER NAME
↓
0x7E
0x7F
↓
↓
PWM15
PWM setting
for string 14
ALTSTR0SET
Alternate
phase delay
for
string 0
0x80
0x81
↓
0xA0
0xA1
↓
0xBE
0xBF
REGISTER DATA
D7
D6
D5
D4
D3
-
-
-
PWM15[11:8]
-
-
-
-
ALTPHDLY[11:8]
↓
ALTPHDLY15[7:0]
ALTSTR15SET
ALTPWM0
Alternate
PWM setting
for string 0
-
-
-
-
ALTPHDLY[11:8]
ALTPWM0[7:0]
-
-
-
-
ALTPWM0[11:8]
↓
↓
↓
ALTPWM15
Alternate
PWM setting
for string 15
ALTPWM15[7:0]
0xC1
E2CTRLSTA
EEPROM
read/write
access
D0
ALTPHDLY0[7:0]
↓
E2ADDR
D1
PWM15[7:0]
-
Alternate
phase delay
for
string 15
0xC0
D2
↓
↓
0x9E
0x9F
FUNCTION
-
-
-
-
E2BUSY
ALTPWM15[11:8]
E2ADDR[6:0]
BLDACT
E2ERR
-
-
RWCTRL[2:0]
* Read-only registers
24
Atmel LED Drivers-MSL2160/MSL2161
Atmel LED Drivers-MSL2160/MSL2161
16-string, White and RGB LED Drivers with Adaptive Configuration,
EEPROM, and SPI/I2C/SMBus Serial Interface
Register Power-up Defaults
Register power-up default values are shown in Table 5.
Table 5. Atmel LED Drivers-MSL2160/1 Register Power-up Defaults
POWER-UP CONDITION
REGISTERS INITIALIZED
FROM EEPROM
REGISTER NAME
AND ADDRESS
REGISTER DATA
D7
D6
D5
D4
D3
D2
D1
D0
HEX
1
1
1
1
1
1
1
1
FF
1
1
1
1
1
1
1
1
FF
0x00
STRINGEN0
0x01
STRINGEN1
0x02
CONFIG
String short circuit confirmation delay = 256µs
String current fold-back enabled
Device is not asleep
0
0
0
0
1
1
0
1
0D
0x03
FLTEN
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
I2C timeout enabled
0
0
1
0
0
1
1
1
27
0x04
FLTMASK0
1
1
1
1
1
1
1
1
FF
0x05
FLTMASK1
1
1
1
1
1
1
1
1
FF
0x0F
OSCFREQ
0
0
0
0
0
1
0
0
04
0x10
FBOCTRL0
0
1
0
0
1
0
0
1
49
0x11
FBOCTRL1
0
0
0
1
1
0
1
0
1A
0x12
FBOCTRL2
0
0
0
0
1
1
1
1
0F
0
0
0
0
0
0
0
0
00
0
1
0
1
0
0
0
0
50
0
0
0
0
0
0
0
0
00
0x20
0x21
0x22
All LED string drive outputs enabled
Fault detection individually enabled for all strings
fOSC = 20MHz
Current sink error confirmation delay = 2µs
FBO power supply settling time allowance = 4ms
Efficiency Optimizer auto-recalibration delay = 1s
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 LSB (1µA)
Efficiency Optimizer initial calibration step size = 1 LSB (1µA)
FBO outputs globally enabled
Open circuit detection enabled for all three FBO outputs
GSCCTRL
External signal at GSC is selected for input to the PWM engine
GSC not internally synchronized to PHI
PWM drive synchronized to falling edge of external GSC
GSC maximum count fault detect is disabled
Although disabled, GSC max fault monitors fpGSC
GSCCNTR
Although disabled, internal GSC frequency
fGGEN = 20MHz / (80 + 1) = 246kHz
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 174 clock cycles
1
0
1
0
1
1
1
0
AE
0
0
0
0
0
0
0
0
00
0x25
0x26
Atmel LED Drivers-MSL2160/MSL2161
25
Table 5. Atmel LED Drivers-MSL2160/1 Register Power-up Defaults
REGISTER NAME
AND ADDRESS
0x27
0x28
0x29
0x2A
0x2B
0x2C
26
HEX
0
0
0
0
0
0
0
0
00
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 maximum count = 4148
0
0
1
1
0
1
0
0
34
0
0
0
1
0
0
0
0
10
1
0
0
1
1
0
0
1
99
0
0
0
0
0
1
1
1
07
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
(95 + 1) / 256 = 37.5%
(1 added in numerator because bit D7 of 0x2D = 1)
0
1
0
1
1
1
1
1
5F
Strings current 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
ISTR
0x7F
D0
0
0x31
0x7E
D1
1
ALTGINT
↓
D2
1
0x30
0x61
D3
0
GINT
0x60
D4
1
0x2F
0x5F
D5
Although disabled, internal PHI frequency
fPGEN = 20MHz / (8 * (10416 + 1)) = 240Hz
PWMCTRL1
↓
D6
PHICNTR
0x2E
0x5E
D7
PHICTRL
PWMCTRL0
0x41
REGISTER DATA
External signal at PHI selected for input to PWM engine
PWM engine is synchronized to the falling edge of PHI
PHI maximum count fault detect is disabled
Although disabled, PHI max count monitors fpPHI
0x2D
0x40
POWER-UP CONDITION
REGISTERS INITIALIZED
FROM EEPROM
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 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 allowed
Delayed turn on occurring in frame zero allowed
Alternate timing not selected by PWM input state
All strings set to zero phase delay
Strings assigned as follows:
FBO1: All strings
FBO2: None
FBO3: None
PWM0
↓
PWM15
↓
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
All strings have PWM tON = 512 GSC cycles
↓
0
0
0
0
0
0
0
0
00
0
0
0
0
0
0
1
0
02
Atmel LED Drivers-MSL2160/MSL2161
Atmel LED Drivers-MSL2160/MSL2161
16-string, White and RGB LED Drivers with Adaptive Configuration,
EEPROM, and SPI/I2C/SMBus Serial Interface
POWER-UP CONDITION
REGISTERS INITIALIZED
FROM EEPROM
REGISTER NAME
AND ADDRESS
0x80
0x81
↓
0x9E
0x9F
0xA0
0xA1
↓
0xBE
0xBF
ALTSTR0SET
↓
D7
D6
D5
D4
D3
ALTPWM0
D1
D0
HEX
0
0
0
0
0
0
0
00
0
0
0
0
0
0
0
0
40
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 PWM tON = 512 GSC cycles
ALTPWM15
D2
0
All strings set to zero phase delay
ALTSTR15SET
↓
REGISTER DATA
↓
0
0
0
0
0
0
0
0
00
0
0
0
0
0
0
1
0
02
REGISTERS WITH FIXED INITIAL VALUES
0xC0
E2ADDR
0xC1
E2CTRLSTA
EEPROM 7 bit address = 0x00
0
0
0
0
0
0
0
0
00
EEPROM read/write disabled
0
0
0
0
0
0
0
0
00
* Read-only registers
Atmel LED Drivers-MSL2160/MSL2161
27
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