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Pin Descriptions
NOTE: To ensure register compatibility with the 16-string device of the same family (Atmel LED Driver-MSL2161), pin names for gate,
drain and source connections are not sequential.
6
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
PIN
NAME
G4
D4
S6
G6
D6
NC
SDA
SCL
GND
FLTB
ADDR
FBO2
FBI1
FBO1
S9
G9
D9
S11
G11
D11
PIN DESCRIPTION
Gate output 4
Gate drive output for external MOSFET 4. Connect G4 to the gate of the external MOSFET driving LED string 4.
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.
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 is reached when 500mV is across the current sense resistor.
Gate output 6
Gate drive output for external MOSFET 6. Connect G6 to the gate of the external MOSFET driving LED string 6.
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.
No connection
Make no connection to NC.
I2C serial data I/O
SDA is the data I/O for the I2C serial interface.
I2C serial clock input
SCL is the clock input for the I2C serial interface.
Ground
Connect GND to system ground and to EP with short, wide traces.
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.
Slave ID selection inputs
Connect ADDR to a resistor to GND to set the device address for the serial interface.
Efficiency Optimizer output 2
Connect FBO2 to the second power supply’s feedback node. If unused, leave FBO2 unconnected.
Efficiency Optimizer input 1
Connect FBI1 to FBO1 of the next device, when chaining the Efficiency Optimizers
Connect FBI1 to GND if unused.
Efficiency Optimizer output 1
Connect FBO1 to the first power supply’s feedback node. If unused, leave FBO1 unconnected.
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 is reached when 500mV is across the current sense resistor.
Gate output 9
Gate drive output for external MOSFET 9. Connect G9 to the gate of the external MOSFET driving LED string 9.
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.
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 is reached when 500mV is across the current sense resistor.
Gate output 11
Gate drive output for external MOSFET 11. Connect G11 to the gate of the external MOSFET driving LED string 11.
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.
Atmel LED Driver-MSL3085
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