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Atmel LED Drivers-MSL3167/MSL3168
16-string, White LED Drivers with Adaptive Power Control,
Simple PWM Dimming Interface, and Fault Handling
Pin Description
Table 1. Pin Descriptions
PIN #
1,
16 - 23,
26 - 32
2
3
4, 6, 12
5
7
8
9
10
11
13
14, 24
15
25
-
NAME
STR0
thru
STR15
FLTB
SCL
NC
SDA
PGND
ILED
EN
VIN
VDD
FBO
CGND
PWM
GND
EP
DESCRIPTION
LED strings STR0 thru STR15 current sink outputs
Connect the cathode of the n th string’s bottom LED to STRn.
Connect unused STRn outputs to GND.
Fault indication output, active low
FLTB sinks current to GND whenever the MSL3167/8 detect a string fault.
When active, FLTB remains low until EN is forced low or power is cycled.
I2C serial clock input
SCL is the clock input for the I2C serial interface. Connect to GND if unused.
No connection
Factory test. Make no connection to NC.
I2C serial data I/O
SDA is the data I/O for the I2C serial interface. Connect to GND if unused.
Power ground
PGND is the path that the STRn sink currents take to ground.
Connect PGND to the ground of the string power supply with wide traces.
Also, connect PGND to EP for the TQFN packaged device.
String maximum current setting input
Connect a resistor from ILED to GND to set the full-scale LED string current.
See the section, “Setting the Maximum LED String Current with R ILED ” on page 11
for information about sizing the resistor.
Enable input (active high)
Force EN high to turn on the MSL3167/8. Force EN low to turn off the MSL3167/8 and to clear FLTB.
For automatic start-up, connect EN to VIN.
Supply voltage input
Connect a 5V supply to VIN. Bypass VIN to GND with a ceramic capacitor of at least 10μF placed close to VIN.
2.5V internal LDO regulator output
VDD is the output of an internal linear regulator powered from VIN. VDD powers internal logic.
Bypass VDD to GND with a ceramic capacitor of at least 4.7μF placed close to VDD.
Efficiency Optimizer output
FBO sources current to the voltage divider of an external DC-DC converter to dynamically
adjust the LED power supply for optimal efficiency.
Connect to GND
Connect CGND to GND.
PWM dimming input
Drive PWM with a pulse-width modulated signal with duty ratio ranging from 0% to 100%
and frequency from 20Hz to 50kHz to control the brightness of all LED strings.
Signal ground
GND is the ground reference for VDD, VIN, and the serial interface.
Exposed pad
Connect EP to PGND with a short, wide trace.
EP provides a path to ground for the string currents, and also provides thermal relief for the die.
Atmel LED Drivers-MSL3167/MSL3168
5
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