6

Atmel LED Driver-MSL3085

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.

PIN

PIN

NAME

PIN 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 10MΩ resistor to the drain of the external MOSFET

driving LED string 4.

3

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 is reached when 500mV is across the current sense resistor.

4

G6

Gate output 6

Gate drive output for external MOSFET 6. Connect G6 to the gate of the external MOSFET driving LED string 6.

5

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.

6

NC

No connection

Make no connection to NC.

7

SDA

I²C serial data I/O

SDA is the data I/O for the I²C serial interface.

8

SCL

I²C serial clock input

SCL is the clock input for the I²C serial interface.

9

GND

Ground

Connect GND to system ground and to EP with short, wide traces.

10

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.

11

ADDR

Slave ID selection inputs

Connect ADDR to a resistor to GND to set the device address for the serial interface.

12

FBO2

Efficiency Optimizer output 2

Connect FBO2 to the second power supply’s feedback node. If unused, leave FBO2 unconnected.

13

FBI1

Efficiency Optimizer input 1

Connect FBI1 to FBO1 of the next device, when chaining the Efficiency Optimizers

Connect FBI1 to GND if unused.

14

FBO1

Efficiency Optimizer output 1

Connect FBO1 to the first power supply’s feedback node. If unused, leave FBO1 unconnected.

15

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 is reached when 500mV is across the current sense resistor.

16

G9

Gate output 9

Gate drive output for external MOSFET 9. Connect G9 to the gate of the external MOSFET driving LED string 9.

17

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.

18

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 is reached when 500mV is across the current sense resistor.

19

G11

Gate output 11

Gate drive output for external MOSFET 11. Connect G11 to the gate of the external MOSFET driving LED string 11.

20

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.