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LED2472G Datasheet

24-channels LED driver

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LED2472G
24-channels LED driver with error detection and gain control
74)3(3
0/34(3[
Features
24 constant current output channels
Output current: from 4 mA to 72 mA
8 x 3 independently controlled channels (RGB)
Current programmable through external
resistor
7-bit global current gain adjustment in two
ranges
Error detection mode (both open and shorted
LED)
Programmable shorted LED detection
thresholds
Auto power-saving / auto wakeup
Gradual output delay (selectable)
Supply voltage: 3 V to 5.5 V
Thermal shutdown and thermal flag
Up to 30 MHz CLK 4 wires interface
20 V current generators rated voltage
Applications
Full color large displays
LED signage
LED screens for indoor and outdoor billboards
Datasheet - production data
Description
The LED2472G is a monolithic, low voltage, low
current power 24-bit shift register designed for
LED panel displays with particular features
oriented to indoor and outdoor LED screen
billboards. The LED2472G guarantees 20 V of
output driving capability, allowing several LEDs to
be connected in series. The device is configured
in 3 groups (red, green and blue) of 8
independently-controlled channels. The LED
current can be separately regulated for each color
within the range from 4 mA to 72 mA. This range
is divided into two sub-ranges and the current can
be adjusted within each range in 64 steps of
resolution (6 bits per color). A single external
resistor is required. All the controls and the shift
register data are accessible via serial interface. A
single 24-bit configuration register is used to
choose features and settings to fit the application.
The LED failure detection circuit checks 3
different conditions that can occur at the output
line: short to GND, short to LED power supply rail
or open channel. The auto power shutdown and
auto power-on feature (selectable) allows the
device to save power without any external
intervention. Thermal management includes
overtemperature flag and the output thermal
shutdown (170 °C). The high clock frequency of
up to 30 MHz makes the device suitable for high
data rate transmission. A selectable gradual
output delay reduces the inrush current. The
supply voltage ranges from 3 V and 5.5 V.
Table 1. Device summary
Order code
Package
Packaging
LED2472GBTR TQFP48-EP
Tape and reel
LED2472GQTR MLPQ40-EP 5x5
April 2014
This is information on a product in full production.
DocID024620 Rev 3
1/39
www.st.com
39


STMicroelectronics Electronic Components Datasheet

LED2472G Datasheet

24-channels LED driver

No Preview Available !

Contents
Contents
LED2472G
1 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3 Thermal characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.1 Typical application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5 Switching characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6 Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7 Simplified Internal block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7.1 Equivalent circuits of inputs and outputs . . . . . . . . . . . . . . . . . . . . . . . . . 16
8 Digital blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8.1 Register access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8.2 Configuration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
8.3 Current ranges (CFG 0-CFG 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
8.4 Error detection conditions (CFG 3-CFG 5) . . . . . . . . . . . . . . . . . . . . . . . . 21
8.5 Auto power shutdown / wakeup (CFG 6) . . . . . . . . . . . . . . . . . . . . . . . . . 21
8.6 SDO delay (CFG 7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
8.7 Gradual output delay (CFG 8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
8.8 Data flow management (CFG 9-CFG 11) . . . . . . . . . . . . . . . . . . . . . . . . . 23
8.9 Gain register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
9 Current adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
10 LED error detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
11 Thermal shutdown and thermal alert . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2/39 DocID024620 Rev 3


Part Number LED2472G
Description 24-channels LED driver
Maker STMicroelectronics
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LED2472G Datasheet PDF






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