L99LD01 datasheet(7/69 Pages) STMICROELECTRONICS

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L99LD01

Block diagram and pin description

Table 1. Pin description

number

Pin name

Function

1VCC1

5 V internal voltage regulator 1 output (external capacitor req.)

NRES

Reset I/O pin; active low

PWM_L

Logic low frequency PWM input

SDI

Serial SPI data input

SDO

Serial SPI data output

SCK

SPI clock

CSN

Chip select not

MOUT

Multiplexed data output pin

EXT_VCC

Internal/external up supply voltage programming pin(1)

In case of externally supplied microcontroller, attach this pin to its external supply voltage pin.

INP_OV

Battery overvoltage programming pin

PWM

Low frequency PWM input (battery compatible)

LHM

Limp home mode input pin

LMODE

Switch input pin (connect to GND if LED drop voltage is referred to GND

or open (5 V) if LED drop is referred to VS)

GND2

GND of controller

NTC

Output for external N.T.C. resistor

RCCOMP

External R C compensation network

VLED

Input for LED chain overvoltage detection

CPB

Charge pump buffer capacitor

Gate 2 output for external PMOS M2

ISENSE-

Negative terminal of the LED sense resistor

ISENSE+

Positive terminal of the LED sense resistor

C5V

Output for 5 V buffer capacitor

PGND

Power ground

Gate 1 output for external PMOS M1

VCC2

10 V voltage regulator 2 output (ext. capacitor required)

ISN

Negative terminal of the shunt resistor

ISP

Positive terminal of the shunt resistor

GND1

GND of controller

ENABLE

Enable pin

Supply voltage input pin

Slope compensation setting resistor

RSF

Oscillator frequency setting resistor

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