Getting started with X-NUCLEO-LED16A1 16-channel LED ... · daisy chain configurations. To supply different rail voltages to different X-NUCLEO-LED16A1 boards in the daisy chain,

November 2016 DocID030021 Rev 1 1/19

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UM2141

Getting started with X-NUCLEO-LED16A1 16-channel LED driver expansion board for STM32 Nucleo

Introduction The X-NUCLEO-LED16A1 is an STM32 Nucleo expansion board designed to provide an application for the 16 channel LED driver LED1642GW. Multiple drivers can also be cascaded by coupling X-NUCLEO-LED16A1 expansion boards.

Depending upon the end application, RGB or single color LEDs can be connected to the board. Separate brightness control is possible for each channel.

It is compatible with the STM32 Nucleo board family and with the Arduino™ UNO R3 connector layout.

Figure 1: X-NUCLEO-LED16A1 expansion board

Contents UM2141

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Contents

1 Getting started ................................................................................. 5

1.1 System setup .................................................................................... 5

1.2 System requirements ........................................................................ 5

2 Hardware description ...................................................................... 7

2.1 Hardware components ...................................................................... 8

2.2 Hardware functional overview ........................................................... 9

2.3 Jumper settings ............................................................................... 10

2.3.1 LED rail voltage source selection ..................................................... 10

2.3.2 SDI-SDO configuration for daisy chain selection ............................. 10

2.4 Fault management .......................................................................... 11

2.5 Connector descriptions ................................................................... 11

3 BoM, schematics and layout ........................................................ 14

3.1 Bill of materials ................................................................................ 14

3.2 Schematic diagram ......................................................................... 16

3.3 Layout ............................................................................................. 17

4 Revision history ............................................................................ 18

UM2141 List of tables

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List of tables

Table 1: LED Rail Voltage Source Selection ............................................................................................ 10 Table 2: SDI line source selection ............................................................................................................ 11 Table 3: SDO line destination selection .................................................................................................... 11 Table 4: Input output connector table ....................................................................................................... 12 Table 5: X-NUCLEO connector (Arduino) table ........................................................................................ 13 Table 6: X-NUCLEO-LED16A1 bill of materials ....................................................................................... 14 Table 7: X-NUCLEO-LED16A1 - RGB LEDs bill of materials................................................................... 15 Table 8: Document revision history .......................................................................................................... 18

List of figures UM2141

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List of figures

Figure 1: X-NUCLEO-LED16A1 expansion board ...................................................................................... 1 Figure 2: STM32 Nucleo development board plus X-NUCLEO-LED16A1 expansion board setup ........... 5 Figure 3: X-NUCLEO-LED16A1 block diagram .......................................................................................... 7 Figure 4: X-NUCLEO-LED16A1 (Top) ........................................................................................................ 8 Figure 5: X-NUCLEO-LED16A1 (Bottom)................................................................................................... 9 Figure 6: X-NUCLEO-LED16A1 RGB LEDs ............................................................................................... 9 Figure 7: Daisy chain configuration .......................................................................................................... 11 Figure 8: X-NUCLEO-LED16A1 connections ........................................................................................... 12 Figure 9: X-NUCLEO-LED16A1 circuit schematic .................................................................................... 16 Figure 10: X-NUCLEO-LED16A1 layout (top) .......................................................................................... 17 Figure 11: X-NUCLEO-LED16A1 layout (bottom) .................................................................................... 17

UM2141 Getting started

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1 Getting started

This section describes the hardware and software requirements for the X-NUCLEO-LED16A1 expansion board for STM32 Nucleo.

1.1 System setup

The X-NUCLEO-LED16A1 is an expansion board for use with STM32 Nucleo boards. To function correctly, STM32 Nucleo board must be connected to X-NUCLEO-LED16A1 shown.

Figure 2: STM32 Nucleo development board plus X-NUCLEO-LED16A1 expansion board setup

The connection between STM32 Nucleo and X-NUCLEO-LED16A1 is designed for use with any STM32 Nucleo or Arduino UNO R3 Platform.

When mounting X-NUCLEO-LED16A1 on the STM32 Nucleo:

ensure that all are pins aligned with their corresponding connector.

handle both boards carefully to avoid damaging or bending the male/female connectors and pins.

1.2 System requirements

The following software and hardware is required:

An STM32 Nucleo development board (suggested order code: either NUCLEO-F401RE or NUCLEO-L053R8).

A 16 Channel LED driver expansion board (order code: X-NUCLEO-LED16A1).

A string of 16 LEDs connected in parallel or X-NUCLEO-LED16A1 expansion board.

A Windows® (8 and above) PC.

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A USB type A to Mini-B USB cable connect the STM32 Nucleo to the PC to: a. power the STM32 Nucleo development and X-NUCLEO expansion boards b. install the board firmware package (order code: X-CUBE-LED1642) and run the

sample application

An optional external power supply, 4.8-5.2V/2A (depending on the number of stacked X-NUCLEO-LED16A1 expansion boards).

UM2141 Hardware description

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2 Hardware description

The X-NUCLEO-LED16A1 expansion board for use with STM32 Nucleo development boards has 16 channels which can be individually controlled. The board can be powered through a 5 V USB supply or an external power supply.

Figure 3: X-NUCLEO-LED16A1 block diagram

The board features:

16 configurable O/P channels

Output current: from 3 mA to 40 mA

20 V current generator rated voltage

Provision for cascading multiple boards

Current adjustment: o 7-bit global current gain adjustment o Current programmable through external resistor o 12/16 bit grayscale brightness control

Selectable LED Bus voltage supply o USB o Vexternal

Error detection o Open LED o Shorted LED

Thermal shutdown

Compatible with STM32 Nucleo board

Equipped with Arduino™ UNO R3 connector

RoHS compliant

Hardware description UM2141

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2.1 Hardware components

The X-NUCLEO-LED16A1 board features several key components, jumpers and connectors.

Figure 4: X-NUCLEO-LED16A1 (Top)

1. LED1642GW LED driver – U1 2. Jumper for selecting SDO line termination (daisy chain or MCU) – J3 3. Jumper for selecting SDI line Initiation (daisy chain or MCU) – J2 4. Connector to connect SDO line in case of daisy chain selection – CN11 5. Jumper for selecting LED rail voltage supply (USB or Vexternal) – J4 6. Indication LED’s (red – fault, green – OK) 7. Input Connector to external voltage power supply – CN3 8. Connector for a common input external voltage power supply – CN2 9. LED’s Cathode are to connected – J1 10. LED Rail Voltage Supply (Common Anode of all J1 Led’s) – CN4 11. ArduinoTM UNO R3 connector – CN5,CN6,CN8,CN9 12. Connector to connect SDO line in case of Daisy Chain Selection – CN1


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Figure 5: X-NUCLEO-LED16A1 (Bottom)

Figure 6: X-NUCLEO-LED16A1 RGB LEDs

2.2 Hardware functional overview

Once the proper firmware is installed on the STM32 Nucleo board and the jumpers and connectors are configured correctly, supplying power causes the green OK LED (D2) on the X-NUCLEO-LED16A1 expansion board and predefined LED patterns run every eight seconds:

1. All LEDs ON at full bightness 2. LED train forward – single LED 3. LED train reverse


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4. LED brigntness – maximum at centre LED 5. Error detection – red FAULT LED (D1) lights up 6. LED brigntness – low to high 7. Different LED – solid color 8. Random LED – random brightness 9. All LEDs ON with less bightness

You can also cycle through the LED sequences by pressing the blue B1 USER button on the STM32 Nucleo board.

Incorrect jumper configurations causes the red LED (FAULT) to light up.

2.3 Jumper settings

2.3.1 LED rail voltage source selection

The X-NUCLEO-LED16A1 LED rail voltage source can be set according to the settings in the following table.

Table 1: LED Rail Voltage Source Selection

Jumper USB 5V supply(1) External supply(2)

J4 Pin1 Pin2 Pin3 Pin1 Pin2 Pin3

YES YES NO NO YES YES

Notes:

(1)Ensure output power consumption is below the USB power rating (2)External voltage supply should be between 4.8 and 5.2 V, capable enough of delivering current as per number of boards used and LED1642GW configuration

2.3.2 SDI-SDO configuration for daisy chain selection

The X-NUCLEO-LED16A1 board can be stacked to operate the LED1642GW LED driver in the daisy chain configuration figured below.


DocID030021 Rev 1 11/19

Figure 7: Daisy chain configuration

The X-NUCLEO-LED16A1 expansion board lets you configure the SDI and SDO lines of SPI through Jumpers J2 and J3, as per the following tables.

Table 2: SDI line source selection

Jumper(1) SDI-MCU SDI-SDO of adjacent board



Notes:

(1)first board stacked on STM32 Nucleo always has 1:2 setting

Table 3: SDO line destination selection

Jumper(1) SDO-MCU SDO-SDI of adjacent board



Notes:

(1)last board stacked on STM32 Nucleo always has 1:2 setting

2.4 Fault management

The X-NUCLEO-LED16A1 detects fault conditions according to the LED1642GW configuration register. Open Circuit, short circuit and combined error tests can be performed; error detection events will light the red FAULT LED on the board.

2.5 Connector descriptions

CN3 – Connection of external LED rail voltage supply.

CN4 - CN5 (RGB LEDs board) – All 16 LED anode terminals are fed the LED rail voltage via connectors CN4 and CN5, as figured below.


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Figure 8: X-NUCLEO-LED16A1 connections

CN2 – Passes the external voltage power supply (from CN3) to subsequent boards in daisy chain configurations.

To supply different rail voltages to different X-NUCLEO-LED16A1 boards in the daisy chain, open resistance R24 and supply the individual voltages through CN3 on each board.

CN10 and CN11 – In daisy chain configurations these connectors are for transferring SPI data between adjacent X-NUCLEO-LED16A1 boards. The behavior of these connectors depends on jumper J2 and J3 settings.

Table 4: Input output connector table

Connector Pin Signal

CN2 1

Common rail voltage for multiple boards 2

CN3 + + External Voltage

- - External Voltage

CN4 1

+ LED Rail Voltage 2


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The default pin assignments for X-NUCLEO-LED61A1 (Arduino) connectors are shown below.

Table 5: X-NUCLEO connector (Arduino) table

Connector Pin Signal

CN5 7

GND CN6 6

CN6 7

CN6 2 +3.3V

CN6 4

CN6 5 +5V

CN5 2 FAULT/OK LED CONTROL

CN5 4 SDI

CN5 5 SDO

CN5 6 SCK

CN9 3 LE

CN9 7 PWCLK

BoM, schematics and layout UM2141

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3 BoM, schematics and layout

3.1 Bill of materials

Table 6: X-NUCLEO-LED16A1 bill of materials

Item Q.ty Reference Part / Value Description Manufacturer Order code

1 1 U1 LED1642GWXTTR 16 Channel LED Driver

ST LED1642GWXTTR

2 1 D3 STPS1L30A Schottky ST STPS1L30A

3 14

R2, R5, R23, R24, R25, R26, R30, R33, R34, R35, R36, R37, R38, R39

0 Ω ANY ANY

4 5 R7, R10, R13, R16,

R19 33 Ω ANY ANY

5 11

R8, R9, R11, R12, R14, R15, R17, R18, R20, R21,

R22

15 Ω ANY ANY

6 1 R3 560 Ω ±5% ANY ANY

7 1 R4 470 Ω ±5% ANY ANY

8 1 R1 11 kΩ ±5% ANY ANY

9 2 R27,R31 DNM

10 2 C1,C3 100 nF 16 V

±10% Ceramic ANY ANY

11 1 C2 10 µF 16 V ±10% Ceramic ANY ANY

12 1 C4 10 µF 35 V ±10% Ceramic ANY ANY

13 1 D1 LED (RED) ANY ANY

14 1 D2 LED (GREEN) ANY ANY

15 1 J1 16-Pin BergStick

Male

2.54mm Pitch, Right

Angle ANY ANY

16 3 J2, J3, J4 3-Pin BergStick

Male 2.54mm

Pitch ANY ANY

17 1 CN1 2-Pin BergStick

Female 2.54mm

Pitch

Sullins Connector Solutions

NPTC021KFXC-RC/S5594-ND (DIGIKEY)

18 1 CN2 CON2 2.54mm

Pitch SAMTEC SSQ-102-03-F-S

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Male 2.54mm

Pitch Molex

0878980204/WM9852-ND(Digikey)

20 1 CN3 Terminal Block 2.54mm

Pitch

On Shore Technology

Inc.

OSTVN02A150/ED10561-

ND(Digikey)


Male

2.54mm Pitch, Right

Angle ANY ANY

22 1 CN5 CON10 SAMTEC SSQ-110-03-F-S

23 2 CN6, CN9 CON8 SAMTEC SSQ-108-03-F-S

24 2 CN7, CN10

DNM SAMTEC SSQ-119-04-L-D

25 1 CN8 CON6 SAMTEC SSQ-106-03-F-S

26 3

Female Straight

Black Open Top 2 Way

R.S. 674-2397

Table 7: X-NUCLEO-LED16A1 - RGB LEDs bill of materials


1 5 D1, D2, D3, D4,

D5 RGB LEDs Common Anode

Wurth Elektronik

150141M173100

2 1 J5 16-Pin BergStick

Female 2.54mm Pitch, Right

Angle ANY ANY


Female 2.54mm Pitch, Right

Angle ANY ANY

BoM, schematics and layout UM2141

16/19 DocID030021 Rev 1

3.2 Schematic diagram

Figure 9: X-NUCLEO-LED16A1 circuit schematic

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UM2141 BoM, schematics and layout

DocID030021 Rev 1 17/19

3.3 Layout

Figure 10: X-NUCLEO-LED16A1 layout (top)

Figure 11: X-NUCLEO-LED16A1 layout (bottom)

Revision history UM2141

18/19 DocID030021 Rev 1

4 Revision history Table 8: Document revision history

Date Version Changes

21-Nov-2016 1 Initial release.

UM2141

DocID030021 Rev 1 19/19

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Documents

Getting started with X-NUCLEO-LED16A1 16-channel LED ... · daisy chain configurations. To supply different rail voltages to different X-NUCLEO-LED16A1 boards in the daisy chain,