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FUNCTIONAL DESCRIPTION
INTRODUCTION
FUNCTIONAL DESCRIPTION
INTRODUCTION
The 34848 is a high efficiency, 8-channel LED driver for
use in LCD backlighting applications. The 34848 is designed
to support up to 160 mA per channel in scan backlight mode,
or 80 mA per channel in local dimming mode. The current
reference is set using a single resistor to GND, and LED
current tolerance is accurate to ±1% channel-to-channel and
IC-to-IC. The current can be programmed in both local
dimming and scan modes independently.
Each channel has independent PWM control with 10-bit
resolution, programmed via the high speed differential
interface. The frequency between ICs is synchronized and
derived from Controller signals. When the SCAN pin is pulled
high, it enables the scan mode. In this mode, each of 8
channels is on for nominally 3/8 (programmable from 2/8 to 5/
8) of the frame.
The integrated boost controller is used to generate the
minimum output voltage required to keep all LEDs illuminated
with the selected current, providing the highest efficiency
possible. The integrated boost clock can be programmed
from 200 kHz and 1.2 MHz using the control interface.
FUNCTIONAL PIN DESCRIPTION
LED CONNECTION (CH1 - CH8)
LED current driver inputs, with maximum sink current
capabilities in local dimming mode of 80 mA, and in scan
mode of 160 mA.
POWER GROUND (PGND)
Power ground of the IC. Internal LED drivers and
regulators are referenced to this pin.
SHIFT REGISTER DIRECTION (SHL)
The direction of the internal shift register is set by this pin.
GROUND FOR REFIO SUPPLY (GNDIO)
Ground reference for the REFIO pin.
ENABLE SCAN MODE (SCAN)
If this pin is taken high, the IC enters in scan mode from
the local dimming mode.
DECOUPLED LOGIC INTERNAL VOLTAGE
(VLOGIC)
This pin is for internal use only, and not to be used for other
purposes. A capacitor of 2.2 μ F is connected between this
pin and ground for decoupling purposes.
TEST MODE (TEST)
This pin is used to enable the test mode.
BOOST CLOCK OUTPUT (SYNC_OUT)
Boost converter frequency is the output on this pin.
SETUP DATA (SETUPD)
When this pin is high, the configuration registers are set to
the default values. When this pin is low, the configuration
registers can be programmed via the differential interface.
ANALOG GROUND (AGND)
Analog ground of the IC. Internal analog signals are
referenced to this pin.
PLL NETWORK (PLLC)
PLL compensation network connection.
CURRENT REFERENCE SETTING (ISET)
The LED current is set with a 2.0 k resistor connected from
this pin to ground. The precision of the resistor is
recommended to be no higher than 0.1%.
REFERENCE VOTALGE SUPPLY (REFIO)
This voltage supply pin is used as a reference for
DIGITAL GROUND (DGND)
Digital ground of the IC. Internal digital signals are
referenced to this pin.
DATA SHIFT REGISTER INPUT/OUTPUT (DIO1/
DIO2)
These pins are used as inputs and outputs to the shift
register depending on the status of SHL.
LOGIC SUPPLY VOLTAGE (DVDD)
Input voltage pin which ranges from 2.6 to 3.6 V, and used
to power the internal logic circuits.
CLOCK SIGNALS (CLK+,CLK-)
Differential data clock signals.
DATA SIGNALS (DATA+, DATA-)
Differential data signals.
achieving high current matching ratios when two or more ICs
are connected together.
34848
Analog Integrated Circuit Device Data
14
Freescale Semiconductor
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