LDLL16ENTR datasheet(3/102 Pages) STMICROELECTRONICS

3 / 102 page

Introduction

The LDLL16EN is a monolithic 16-channel LED Driver designed for automotive exterior and interior LED lighting

applications. It guarantees up to 20 V output driving capability, allowing users to connect several LEDs in series,

and features 16 regulated current sinkers able to provide from 6.3 mA to 100 mA programmable current to drive

LEDs.

The LEDs brightness can be adjusted separately through an 8-bit PWM exponential dimming control.

The LDLL16EN integrates a robust purely automotive CAN FD light compatible serial communication interface,

which allows a high rate data transmission (up to 1 Mbit/s) and uses the CAN FD structure for long frames. The

device integrates a protocol handler, so no additional external devices are needed to facilitate communication with

the commander ECU, and a RX/TX interface for communication with an external transceiver sharable among

several devices (up to 6). The LDLL16EN can operate in bus mode using the CAN FD light compatible interface

or in stand-alone/fail-safe mode using internal few time programmable (FTP) memory registers.

Thanks to its programmability through the CAN FD light compatible communication interface, the device supports

generic platform approaches, which require a software configurability of several parameters.

This differential robust interface offers a detailed diagnostic of the device itself, as well as of the controlled LED

strings, and makes the device suitable for high data rate transmission, up to 1 Mbit/s.

As the device potentially controls safety critical functions, such as brake, built-in features are integrated in order to

support a high level of functional safety at application level: a programmable timeout watchdog, a monitoring of

the watchdog counter, a fail-safe state (limp-home function) and one direct input.

The device supports control of up to two individual lighting functions, each channel can be mapped flexible to the

direct input or not, and features also one VPREG pin, to supply the current sinkers through an external

preregulator.

Thanks to integrated high precision oscillators, the device autonomously generates all relevant timing functions

such as PWM frequency, duty cycle, trigger points for ADC conversion, phase shift, etc. No external timers are

required.

In the LDLL16EN, thanks to the integration of an 8-bit ADC, a complete diagnostic is also available: open-load,

output channel short to external preregulator, output channel LED (single or multiple) short detection, LED current

derating in case of device temperature increasing.

Diagnostic thresholds are freely configurable for each function group. Moreover, the user can configure the

desired device reaction to detected faults, ensuring maximum flexibility for the application and sophisticated auto-

recovery strategies.

The device features also the output gradual delay, which avoids the contemporary turning on of all the channels

used for a specific light function, reducing the inrush current. To further improve EMI performances, the device

implements an internal clock dithering to have a spread spectrum noise reduction.

Thermal management is equipped with thermal warning (TW) and outputs thermal shutdown (TSD). The device

performs an automatic thermal derating based on external NTC measurement as well on device junction

temperature (TJ).

The supply voltage range is between VS_MIN and 40 V avoiding any additional load dump protection on the power

supply stage.

LDLL16EN

Introduction

DS14111 - Rev 5

page 3/102

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