Datasheet

16
Atmel MSL3080 Datasheet
8 String 60mA LED Driver with Integrated Boost Controller
8.10 Internal Supervisory and LDO
The MSL3080 has a Power-On-Reset circuit that monitors VIN and allows operation when VIN exceeds 4.25V. The MSL3080 has built-in
LDOs that generate 2.5V to power the logic and oscillator sections. An integrated supervisor ensures that the LDO and internal oscillator
are stable before enabling the boost controller. The boost controller goes through a soft-start before the LED drivers are enabled.
8.11 Internal Oscillator
The MSL3080 includes a 20MHz internal oscillator that is divided down to drive the boost controller, and the LED PWM engine. The
oscillator is factory trimmed. Contact the factory if required to change the 20MHz default oscillator frequency; available frequencies fall
between 16MHz and 24MHz.
8.12 Over Temperature Shutdown
The MSL3080 includes automatic over-temperature shutdown. When the die temperature exceeds 135°C, the driver turns off, as if EN
is pulled low, and is held off until the die temperature drops below 120°C, at which time it turns back on. While MSL3080 is in over-
temperature shutdown the onboard regulators are off, register values reset to their power-on default values, and the serial interface is
disabled.
8.13 Power Saving Modes
The MSL3080 has 3 primary power save modes available through the I
2
C compatible serial interface. See the
“MSL3040/50/60/80/86/87/88 Programming Guide” for information.
8.14 I
2
C Serial Interface and Driver Control
The I
2
C serial interface, whose use is optional, allows control of PWM dimming, fault monitoring, and various other control functions. For
a detailed explanation of interface operation see the “MSL3040/50/60/80/86/87/88 Programming Guide”.