8

Atmel LED Drivers-MSL1061/MSL1064

PIN NAME

MSL1061

MSL1064

PIN DESCRIPTION

VCC

1

1

6V internal linear regulator output

VCC powers the internal power FET switch driver.

Bypass VCC to GND either with a 10µF or greater ceramic capacitor, or with a 10µF or

greater tantalum capacitor in parallel with a 1µF ceramic capacitor.

If the voltage at VIN is less than 6.5V, connect VCC directly to VIN to bypass the internal

linear regulator, and power the driver directly from VIN

VDD

2

2

2.9V internal linear regulator output

VDD powers internal logic. Bypass VDD to GND with at least a 4.7µF ceramic capacitor

TEST1

3

3

Factory test connection.

Leave unconnected

TEST2

4

4

Factory test connection.

Connect to GND

SDA

5

5

I²C serial data I/O

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

SCL

6

6

I²C serial clock input

SCL is the clock input for the I²C serial interface

AD0

7

-

I²C slave ID selection input

For MSL1061, connect AD0 to GND, VDD, SCL, or SDA to set the I²C slave ID to 0x60,

0x61, 0x62, or 0x63. The MSL1064 I²C slave ID is fixed at 0x62, and is not user-selectable

PWM

8

7

PWM control input

Drive PWM with a PWM signal up to 40kHz to pulse-width-modulate the LED current

FLTB

9

8

Fault indication output (active low)

FLTB sinks current to GND whenever the MSL1061/64 detects a fault.

Once a fault is detected, FLTB remains low until EN is toggled low/high, input power is

cycled off/on, or the fault status is reset through the I²C interface.

OSC

10

9

Oscillator control input

Connect a 115kΩ, 1% resistor from OSC to GND to set the internal oscillator frequency

to 11MHz and the boost regulator switching frequency to 1.1MHz

TEST3

11

-

Factory test connection with internal 1.8kΩ pull-up to VDD.

Leave unconnected

ILED

12

10

Maximum LED current control input

Connect a resistor from ILED to GND to set the full-scale LED string current.

For example, connect a 100kΩ resistor to GND to set a 20mA sink current through

each LED string

Pin Descriptions

Table 3. Pin Assignments