ST X-NUCLEO-LED12A1 Manuale utente

Introduction

The X-NUCLEO-LED12A1 LED driver expansion board for STM32 Nucleo features four LED1202 devices that can drive up to

48 LEDs.

The LED1202 is a 12-channel low quiescent current LED driver, which guarantees 5 V output driving capability. Each channel is

able to provide up to 20 mA with a headroom voltage of 350 mV (typ.) only.

The output current can be adjusted separately for each channel through an 8-bit analog and 12-bit digital dimming control.

The X-NUCLEO-LED12A1 expansion board comes with an additional LED panel board that houses two LEDs matrices: a 6x8

white LED matrix and a 4x4 RGB matrix.

LED matrices can be supplied via an external power supply connected to J13 connector and by selecting the right path through

J15 jumper to reach the maximum luminosity available.

Figure 1. X-NUCLEO-LED12A1 expansion board

Figure 2. LED panel board

Getting started with the X-NUCLEO-LED12A1 LED driver expansion board based

on LED1202 for STM32 Nucleo

UM2879

User manual

UM2879 - Rev 2 - November 2021

For further information contact your local STMicroelectronics sales office.

www.st.com

1Getting started

1.1 Overview

The X-NUCLEO-LED12A1 expansion board features:

•Four LED1202 devices driving up to 48 LEDs

• One double row pin array connector for external LED panel connection

• One jumper selector for internal/external LED power supply

• One panel with 48 white LEDs/16 RGB LEDs included

• Arduino UNO R3 connectors

• Free comprehensive development firmware library compatible with STM32Cube

• Scalable solution for multiple board stack

• RoHS and WEEE compliant

1.2 Hardware requirements

The X-NUCLEO-LED12A1 expansion board is designed to be used with any STM32 Nucleo development

board, although complete testing has been performed using the NUCLEO-L073RZ hosting the STM32L073RZ

microcontroller.

1.3 System requirements

To use STM32 Nucleo development boards with the X-NUCLEO-LED12A1 expansion board, the following

software and hardware are required:

• an STM32 Nucleo-64 development board

• a Windows® PC to install the firmware package

• a USB type A to Mini-B USB cable to connect the STM32 Nucleo board to the PC

• 128 MB of RAM and 40 MB of free hard disk space to install the firmware package (order code: X-CUBE-

LED12A1)

UM2879

Getting started

UM2879 - Rev 2 page 2/17

2Connectors

The X-NUCLEO-LED12A1 expansion board allows the user to test the functionality of the LED1202, together with

the use of the additional LED panel board.

The 4 LED1202 ICs and the STM32 Nucleo development board are connected through CN5, CN6, CN8 and CN9

connectors (see the tables below).

Table 1. Interconnections between X-NUCLEO-LED12A1 expansion board and NUCLEO-L073RZ

development board (left side)

Signal Connector Pin number NUCLEO-L073RZ X-NUCLEO-LED12A1

CN6 Power

1 - -

IOREF 2 - (NC)

RESET 3 - -

3V3 4 - 3V3

5V 5 - 5V (VDD)

GND 6 - GND

GND 7 - GND

VIN 8 - -

CN8 Power

1 PA0 IRQ_MCU (alt.)

A1 2 PA1 IRQ_MCU (alt.)

A2 3 PA4 IRQ_MCU (alt.)

A3 4 PB0 IRQ_MCU (alt.)

A4 5 PC1 NC

A5 6 PC0 NC

Table 2. Interconnections between X-NUCLEO-LED12A1 expansion board and NUCLEO-L073RZ

development board (right side)

Signal Connector Pin number NUCLEO-L073RZ X-NUCLEO-LED12A1

D15

CN5 Digital

10 PB8 SCL_MCU

D14 9 PB9 SDA_MCU

AVDD 8 AVDD NC

GND 7 GND NC

D13 6 PA5 NC

D12 5 PA6 NC

D11 4 PA7 NC

D10 3 PB6 NC

D9 2 PC7 NC

D8 1 PA9 NC

CN9 Digital

8 PA8 NC

D6 7 PB10 NC

D5 6 PB4 NC

D4 5 PB5 NC

UM2879

Connectors

UM2879 - Rev 2 page 3/17

Signal Connector Pin number NUCLEO-L073RZ X-NUCLEO-LED12A1

CN9 Digital

4 PB3 IRQ_MCU

D2 3 PA10 NC

D1 2 PA2 NC

D0 1 PA3 NC

UM2879

Connectors

UM2879 - Rev 2 page 4/17

3Host interface and GPIO connection

The X-NUCLEO-LED12A1 expansion board embeds four LED1202 devices and is powered by the STM32 Nucleo

development board.

The devices are driven by the microcontroller via I2C interface, connected through the same I2C bus and

synchronized by a clock chain.

UM2879

Host interface and GPIO connection

UM2879 - Rev 2 page 5/17

4Components

Figure 3. X-NUCLEO-LED12A1 expansion board component placement

1. LED1202

2. LED1202

3. LED1202

4. LED1202

5. LED panel connector

6. LED panel power supply connector

UM2879

Components

UM2879 - Rev 2 page 6/17

5LED1202

The LED1202 is a 12-channel low quiescent current LED driver which guarantees 5 V output driving capability.

Each channel is able to provide up to 20 mA with a headroom voltage of 350 mV (typ.) only. The output current

can be adjusted separately for each channel by an 8-bit analog and 12-bit digital dimming control.

A slow turn-on and turn-off time improves the system low noise generation performance; moreover, the phase

shifting function helps to reduce the inrush current. Eight patterns can be stored in the internal registers for

automatic sequencing without involving the MCU.

The pattern sequence can be also configured for duration time and number of repetitions. In multi-device

applications, a common clock domain can be shared for timing synchronization.

The device features thermal shutdown and open LED detection. The device I²C interface is based on fast mode

specification and works up to 400 kHz. Eight I²C addresses are possible by using two configuration pins (A0/A1)

only.

UM2879

LED1202

UM2879 - Rev 2 page 7/17

6Board setup

To test the expansion board follow the procedure below.

Step 1. Connect the X-NUCLEO-LED12A1 expansion board to the STM32 Nucleo development board from the

top through the Arduino UNO R3 connectors.

Step 2. Power the STM32 Nucleo development board using a mini-B USB cable.

Step 3. Program the firmware on the STM32 Nucleo development board using the provided example.

Step 4. Reset the MCU using the STM32 Nucleo reset button.

Step 5. Configure J15 jumper for internal or external LED power supply.

– Connect pin 1 with pin 2 for external LED power supply.

– Connect pin 2 with pin 3 for internal LED power supply.

For internal LED power supply, the PC USB port drives the LED current.

Important:

For external LED power supply, the current capability has to be provided through J13 connector. Do not apply an external

voltage greater than 6 V: as this is the absolute maximum rating of LED1202 LED channels, it is recommended to remain

below 5.5 V.

UM2879

Board setup

UM2879 - Rev 2 page 8/17

7Schematic diagrams

Figure 4. X-NUCLEO-LED12A1 expansion board circuit schematic

LED CONNECTORS

NUCLEO MORPHO CONNECTORS

ADDR=58h

ADDR=5Ah

ADDR=59h

Place close to J13

ADDR=5Bh

ARDUINO

CONNECTORS

LED1202

IRQn

CS0

CS1

CS2

CS3

CS4

CS5

GND

CS6

CS7

VIN 15

CS11 14

CS10 13

CS9 12

CS8 11

SCL 20

SDA 19

A1 18

A0 17

VLDO 16

10K

CN9

CONN1x8 2.54mm

C12

1u 16V

C15

1u 16V

J13

Phoenix 1725656

C13

1u 16V

R16 NM R6

10K

LED1202

IRQn

CS0

CS1

CS2

CS3

CS4

CS5

GND

CS6

CS7

VIN 15

CS11 14

CS10 13

CS9 12

CS8 11

SCL 20

SDA 19

A1 18

A0 17

VLDO 16

C11

180u 16V

1u 16V

R12

10K

R15 NM

R18 NM

1u 16V

R1336K

J15

HEADERx3 2.54

LDL112PT-TR

VOUT 2

GND

VIN

5ADJ 1

CN6

CONN1x8 2.54mm

C14

1u 16V

J18

CONN PLUG 26x2 1.27mm Right Angle

CN7

CONN19x2 2.54 Low Insertion Force

10K

CN5

CONN1x10 2.54mm

R17 NM

1u 16V

10K

CN10

CONN19x2 2.54 Low Insertion Force

LED1202

IRQn

CS0

CS1

CS2

CS3

CS4

CS5

GND

CS6

CS7

VIN 15

CS11 14

CS10 13

CS9 12

CS8 11

SCL 20

SDA 19

A1 18

A0 17

VLDO 16

C10

22u 16V

10K

CN8

CONN1x6 2.54mm

R11

R14

10K

1u 16V

LED1202

IRQn

CS0

CS1

CS2

CS3

CS4

CS5

GND

CS6

CS7

VIN 15

CS11 14

CS10 13

CS9 12

CS8 11

SCL 20

SDA 19

A1 18

A0 17

VLDO 16

1u 16V

3V3

L1_CS0

L1_CS1

L1_CS2

L1_CS3

L1_CS4

SCL

SDA

L1_CS5

SCL

SDA

L1_CS6

L1_CS7

L1_CS8

L1_CS9

L1_CS10

L1_CS11

LED_IRQ 3V3 LED_IRQ 3V3

L3_CS0 L3_CS11 L1_CS0 L1_CS11

L3_CS1 L3_CS10 L1_CS1 L1_CS10

L3_CS2 L3_CS9 L1_CS2 L1_CS9

L3_CS3 L3_CS8 L1_CS3 L1_CS8

L3_CS0

L3_CS1

L3_CS2

L3_CS3

L3_CS4

L3_CS5

GND

L3_CS6

L3_CS7

L1_CS4

L1_CS5

GND

L1_CS6

L1_CS7

L3_CS5

L3_CS6

SCL

SDA

SCL

SDA

LED_IRQ 3V3

L2_CS0 L2_CS11

L2_CS1 L2_CS10

L2_CS2 L2_CS9

L2_CS3 L2_CS8

L2_CS4

L2_CS5

GND

L2_CS6

L2_CS7

3V3

SDA

SCL

LED_IRQ

VLED

3V7

3V3

SCL

SDA

LED_IRQ 3V3

L4_CS0 L4_CS11

L4_CS1 L4_CS10

L4_CS2 L4_CS9

L4_CS3 L4_CS8

L4_CS4

L4_CS5

GND

L4_CS6

L4_CS7

L3_CS11

L3_CS10

L3_CS9

L3_CS8

L3_CS7

L4_CS0

L4_CS1

L4_CS2

L4_CS3

L4_CS4

L4_CS5

L4_CS6

L4_CS7

L4_CS8

L4_CS9

L4_CS10

L4_CS11

L2_CS11

L2_CS10

L2_CS9

L2_CS8

L2_CS7

L2_CS6

L2_CS5

L2_CS4

L2_CS3

L2_CS2

L2_CS1

L2_CS0

5V 3V7

3V3

VLED

LED_IRQ

I_3

I_2

I_5

I_4 I_1I_2

I_3

I_4

I_5

I_2

I_3

I_4

I_5

I_1

SCL

SDA

I_1

UM2879 - Rev 2 page 9/17

UM2879

Schematic diagrams

Figure 5. LED panel circuit schematic

UM2879 - Rev 2 page 10/17

UM2879

Schematic diagrams

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