Ver1.0

3

LD1071

16 Channel Output LED Driver with 14 bit PWM Controller

The LD1071 is specifically designed for LED and LED display applications using PWM(Pulse Width

Modulation) control with 14 bit color depth. The LD1071 provides a constant output current for driving the

LEDs against for the variation of LED forward voltage( Vf ). The constant output current can be preset

through an external resistor. Moreover, the preset output current with external resistor can be

programmed up to 256 levels for LED global brightness adjustment. The LD1071 consists of 16 bit shift

registers, latches, and-gates, constant current driver and 14 bit PWM controller.

FEATURES

• Output current : set-up at 5mA to 45mA with an external

resistor

( when VDD=3.3V, Iout : 5mA ~ 30mA )

• Include error detection circuit

• 16 constant current output channels

• 14 bit gray scale PWM control

• 8 bit programmable output current control

• Constant current accuracy

- Pin to pin deviation : < ±3% (Max)

- Chip to chip deviation : < ±6% ( Max)

• 3.3V / 5V CMOS compatible input

• Package : LD1071-SP (SOP-24), LD1071-SS (SSOP-24)

• Maximum CLOCK input frequency : 25MHz

• Maximum PWMCK input frequency : 25MHz

DESCRIPTION

PIN DESCRIPTION

PIN NO.

PIN NAME

DESCRIPTION

1

GND

Ground signal

2

DIN

Serial input data

3

CLOCK

Shift input clock for serial input data DIN( Rising Edge Clocking)

4

STROBE

Data strobe signal. This pin is a pull-down type.

24

VDD

Power supply signal (3.3V/5V)

21

PWMCK

PWM gray scale clock signal. This pin is a pull-up type.

22

DOUT

Serial data output

23

REXT

Connect the resistor between this pin and GND to set up the constant

output current for all the OUTn.

5~12

13~20

OUTn

Constant current outputs, n = 0 ~ 15

PIN CONFIGURATION

1

2

3

4

5

6

7

8

9

10

11

12

24

23

22

21

20

19

18

17

16

15

14

13

GND

DIN

CLOCK

STROBE

OUT0

OUT1

OUT2

OUT3

OUT4

OUT5

OUT6

OUT7

VDD

REXT

DOUT

PWMCK

OUT15

OUT14

OUT13

OUT12

OUT11

OUT10

OUT9

OUT8