NXP Semiconductors PCA9957 User Manual
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NXP Semiconductors PCA9957 User Manual

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UM11196
PCA9957 Evaluation board OMPCA9957LEDEV
Rev. 1.0 — 27 April 2020
Document information
Information
Content
Keywords
SPI-bus, PCA9957, RGB and White LEDs, 24-channel x 8-bit PWMs
Abstract
The OMPCA9957LEDEV eval board allows test and design for the PCA9957,
which is a 24-channel SPI 4-wire bus 32 mA/5.5V constant current LED
driver. This eval board, along with the OM13089 MCU board, provides an
easy to use evaluation platform.
User manual

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Summary of Contents for NXP Semiconductors PCA9957

  • Page 1 SPI-bus, PCA9957, RGB and White LEDs, 24-channel x 8-bit PWMs Abstract The OMPCA9957LEDEV eval board allows test and design for the PCA9957, which is a 24-channel SPI 4-wire bus 32 mA/5.5V constant current LED driver. This eval board, along with the OM13089 MCU board, provides an...
  • Page 2 UM11196 NXP Semiconductors PCA9957 Evaluation board OMPCA9957LEDEV Revision history Revision history Date Description v.1.0 20200427 Initial version UM11196 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2020. All rights reserved. User manual Rev. 1.0 — 27 April 2020...

  • Page 3: Introduction

    PCA9957 Evaluation board OMPCA9957LEDEV Introduction The PCA9957 evaluation board features LEDs for color mixing, blinking and dimming demonstrations. A graphical interface allows the user to easily explore the different functions of the driver. The board can be connected in series with other SPI-bus demo- boards to create an evaluation system.

  • Page 4: Features

    • A complete evaluation platform for the PCA9957 24-channel SPI-bus 35 mA/5.5V constant current LED driver • Easy to use GUI based software demonstrates the capabilities of the PCA9957. • On-board Infrared, blue and RGB LEDs for variable experiments • Convenient test points for easy scope measurements and signal access •...

  • Page 5: Getting Started

    UM11196 NXP Semiconductors PCA9957 Evaluation board OMPCA9957LEDEV Getting started 3.1 Assumptions Familiarity with the SPI-bus is helpful but not required. 3.2 Static handling requirements CAUTION This device is sensitive to ElectroStatic Discharge (ESD). Therefore care should be taken during transport and handling. You must use a ground strap or touch the PC case or other grounded source before unpacking or handling the hardware.

  • Page 6: Hardware Installation

    OMPCA9957LEDEV evaluation board is connected to the OM13089 MCU board using two connectors (J1 & J2 on OMPCA9957LEDEV board and J1 & J8 on OM13089 board). The OM13089 MCU board communicates with PCA9957 demo GUI through PC USB port and uses SPI bus to communicate to PCA9957.
  • Page 7 UM11196 NXP Semiconductors PCA9957 Evaluation board OMPCA9957LEDEV • Use J5 (USB Micro-B connector) on OM13089 for power supply and GUI communication port. • Use J7 (USB Micro-B connector) on OM13089 for additional power supply Figure 3.  OMPCA9957LEDEV evaluation board connecting to the OM13089 MCU board UM11196 All information provided in this document is subject to legal disclaimers.

  • Page 8: Hardware Description

    PCA9957 Evaluation board OMPCA9957LEDEV Hardware description • J1 and J2 are connected to the PM13089 MCU board. • J123 selects PCA9957 VDD power supply. • J120 selects PCA9957 VDDIO power supply. • J113 selects LED power supply. Table 1. OMPCA9957LEDEV EV board main components...
  • Page 9 UM11196 NXP Semiconductors PCA9957 Evaluation board OMPCA9957LEDEV Jumper Default setting Comment SPI bus interface to the OM13089 MCU board J3, J4 For OMPCA9957LEDEV SPI daisy chain test MISO MOSI SPI bus test points J8,J9,J10,J11 SPI bus SPI bus test points Table 4. Jumper settings for LEDs...
  • Page 10 UM11196 NXP Semiconductors PCA9957 Evaluation board OMPCA9957LEDEV Jumper Default setting Comment D12 - RGB LED 1-2: Not measuring D12 current Open: Use current J75, J77, J80 meter to measure D12 current J76, J78, J79 Open D12 - RGB LED 1-2: Bypass D12 LED Open: Use D12 LED...
  • Page 11 UM11196 NXP Semiconductors PCA9957 Evaluation board OMPCA9957LEDEV Figure 4. Jumpers and test points location UM11196 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2020. All rights reserved. User manual Rev. 1.0 — 27 April 2020...

  • Page 12: Schematic

    Drawing Title: Drawing Title: Drawing Title: OMPCA9957LEDEV OMPCA9957LEDEV OMPCA9957LEDEV Page Title: Page Title: Page Title: PCA9957 & PCA9959 & SKT PCA9957 & PCA9959 & SKT PCA9957 & PCA9959 & SKT Size Size Size Document Number Document Number Document Number SCH-39109 PDF: SPF-39109...
  • Page 13 UM11196 NXP Semiconductors PCA9957 Evaluation board OMPCA9957LEDEV TP16 +5V_MCU J113 LED voltage select: OPEN: use external voltage VOUT_ADJ 1-2: +5V TP15 2-3: +3.3V 2-4: +2.5V to +4.1V +3V3_MCU OUT1 OUT2 HDR 1X1 + HDR 1X3 OUT3 JUMPER DEFAULT = 2-4...
  • Page 14 UM11196 NXP Semiconductors PCA9957 Evaluation board OMPCA9957LEDEV LED[0..23] LED[0..23] [2,3] VDDIO CON 1 SMB CON 1 SMB CON 1 SMB CON 1 SMB CON 1 SMB CON 1 SMB CON 1 SMB CON 1 SMB CON 1 SMB CON 1 SMB...

  • Page 15: Pca9957 Demo Gui

    NXP Semiconductors PCA9957 Evaluation board OMPCA9957LEDEV PCA9957 Demo GUI 7.1 Run PCA9957 GUI V0.1.exe on Windows 7, 8, or 10 PC 1. Click “Connect” button to connect OM13089 board 2. If OM13089 board is detected a. It shows “OM13089 board connected” in Message Box b.
  • Page 16 It shows MOSI and MISO value in Message Box 5. “Write All REG” and “Read All REG” buttons a. Use “Write All REG” button to write in all register value into PCA9957 b. Use “Read All REG” button to read our all register value from PCA9957 UM11196 All information provided in this document is subject to legal disclaimers.
  • Page 17 UM11196 NXP Semiconductors PCA9957 Evaluation board OMPCA9957LEDEV 6. Use “PWM 0 to 7” page to adjust PWM0 – PWM7 setting a. Use PWM0 – PWM7 scroll bar to adjust PWM value 7. Use “PWM 16 to 23” page to adjust PWM16 – PWM23 setting a.
  • Page 18 UM11196 NXP Semiconductors PCA9957 Evaluation board OMPCA9957LEDEV 8. Use “LEDOUT” page to select LED0 - 23 output state control a. Use LED0 control box to select LED0 output pin to ON state 9. Use “Output Gain” page to set select LED0 - 23 output current setting a.
  • Page 19 UM11196 NXP Semiconductors PCA9957 Evaluation board OMPCA9957LEDEV 10. Use “Grad. Control 1” page to select settings for group 0 – 5 a. Ramp enable and rate control, step time control, hold ON/OFF time control and output gain control for group 0-5 settings 11.
  • Page 20 UM11196 NXP Semiconductors PCA9957 Evaluation board OMPCA9957LEDEV 12. Use “Error Flags” page to read out error status for LEDs output a. Click on “Read Error Flags” button to read out error status for LED0-23 output b. Click on “CLRERR” button to clear error flags.
  • Page 21 UM11196 NXP Semiconductors PCA9957 Evaluation board OMPCA9957LEDEV 14. Use “SPI” page select SPI interface related settings a. SPI speed, Pre-Delay, Post-Delay, Frame Delay, Transfer Delay and command interface UM11196 All information provided in this document is subject to legal disclaimers.

  • Page 22: Abbreviations

    UM11196 NXP Semiconductors PCA9957 Evaluation board OMPCA9957LEDEV Abbreviations Table 7. Abbreviations Acronym Description Electro Static Discharge Graphical User Interface C-bus Inter-integrated Circuit bus Integrated Circuit Light Emitting Diode MISO Master In, Slave Out MOSI Master Out, Slave In Personal Computer Pulse Width Modulator...

  • Page 23: References

    UM11196 NXP Semiconductors PCA9957 Evaluation board OMPCA9957LEDEV References PCA9957 — 24-channel SPI serial bus 32 mA / 5.5V constant current LED driver; Product data sheet; NXP Semiconductors UM11196 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2020. All rights reserved.

  • Page 24: Legal Information

    Customer is responsible for doing all necessary testing for the customer’s applications and products using NXP Semiconductors products in order to avoid a 10.2 Disclaimers default of the applications and the products or of the application or use by customer’s third party customer(s).
  • Page 25 UM11196 NXP Semiconductors PCA9957 Evaluation board OMPCA9957LEDEV Tables Tab. 1. OMPCA9957LEDEV board main Tab. 4. Jumper settings for LEDs ........9 components ............8 Tab. 5. Jumper settings for SMB connectors ....10 Tab. 2. Jumper settings for power supply ..... 8 Tab.
  • Page 26 UM11196 NXP Semiconductors PCA9957 Evaluation board OMPCA9957LEDEV Figures Fig. 1. OMPCA9957LEDEV evaluation board ....6 Fig. 5. PCA9957 schematic ........12 Fig. 2. OM13089 MCU board ........6 Fig. 6. LED portion schematic ........13 Fig. 3. OMPCA9957LEDEV evaluation board Fig. 7.

  • Page 27: Table Of Contents

    OM13089 MCU board connection ..... 6 Hardware description ......... 8 Schematic ............12 PCA9957 Demo GUI .......... 15 Run PCA9957 GUI V0.1.exe on Windows 7, 8, or 10 PC ............15 Abbreviations ............ 22 References ............23 Legal information ..........24 Please be aware that important notices concerning this document and the product(s) described herein, have been included in section 'Legal information'.

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