NXP Semiconductors PCA9957 User manual

UM11196
PCA9957 Evaluation board OMPCA9957LEDEV
Rev. 1.0 — 27 April 2020 User manual
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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.

NXP Semiconductors UM11196
PCA9957 Evaluation board OMPCA9957LEDEV
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
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Revision history
Revision history
Rev Date Description
v.1.0 20200427 Initial version

NXP Semiconductors UM11196
PCA9957 Evaluation board OMPCA9957LEDEV
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
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1 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.
The IC communicates to the host via the industry standard SPI-bus port. The evaluation
software runs under Microsoft Windows 7, 8, and 10 PC platform.

NXP Semiconductors UM11196
PCA9957 Evaluation board OMPCA9957LEDEV
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
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2 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
•USB interface to the host PC
•Power supply from USB port (x2) or external power supply can be used to power
PCA9957 evaluation board

NXP Semiconductors UM11196
PCA9957 Evaluation board OMPCA9957LEDEV
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
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3 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.
3.3 Minimum system requirements
•PC Pentium processor (or equivalent)
•One USB port (either 3.0 or 2.0 or 1.1 compatible)
•Windows 7, 8, or 10
•OM13089 MCU board (from www.nxp.com)
3.4 Power requirements
The OM13089 MCU board obtains power from the PC USB port, two USB parts can
be connected to the OM13089 MCU board simultaneously. Please use external power
supply option if exceeding the USB port current capabilities.

NXP Semiconductors UM11196
PCA9957 Evaluation board OMPCA9957LEDEV
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
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4 Hardware installation
4.1 OMPCA9957LEDEV EV board and OM13089 MCU board connection
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.
Figure 1. OMPCA9957LEDEV evaluation board
Figure 2. OM13089 MCU board

NXP Semiconductors UM11196
PCA9957 Evaluation board OMPCA9957LEDEV
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
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•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

NXP Semiconductors UM11196
PCA9957 Evaluation board OMPCA9957LEDEV
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
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5 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
Device Description Location
PCA9957 24-channel SPI-bus 32mA/5.5V constant current LED driver U2
LP38502SD-ADJ Adjustable output voltage LDO U3
Green LED Green LED for power supply indicator D1
APT1608QBC/D Blue LED D2, D3, D4
SCM-013RT Infrared LED D8, D9, D10
LRTB GVSG RGB LED D5, D6, D7, D11,
D12, D13
Table 2. Jumper settings for power supply
Jumper Default setting Comment
J123 1-2 1-2: Use +3V3 power supply for VDD 3-4: Use +5V power supply for
VDD Open: Use external power supply from J124
J124 N/A External power supply for VDD
J125 1-2 1-2: LED output enabled
Open: LED disabled
J129 Open 1-2: LED output disabled
Open: LED output enabled
J120 1-2 1-2: Use external power supply from J121 3-4: Use VDD_IN for VDDIO
power supply
J121 N/A External power supply for VDDIO
J118 1-2
1-2 : Not measuring VDD current Open: Use current meter to measure
VDD current
J122 1-2 1-2 : Not measuring VDDIO current Open: Use current meter to
measure VDDIO current
J137 1-2 1-2 : Use external POR circuit Open: Use internal POR circuit
J113 1-2 1-2: LED power supply from +5V_MCU 4-2: LED power supply from
VOUT_ADJ 3-2: LED power supply from +3V3_MCU
J63 3-4 REXT = 2 kohm, Iref = 125 uA
Output current = Iref * IREF_GRPx[7:0].
Table 3. Jumper settings Host interface
Jumper Default setting Comment
J1 N/A Power supply from OM13089 MCU board

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PCA9957 Evaluation board OMPCA9957LEDEV
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Jumper Default setting Comment
J2 N/A SPI bus interface to the OM13089 MCU board
J3, J4 N/A For OMPCA9957LEDEV SPI daisy chain test
J5 1-2 MISO
J6 1-2 MOSI
J7 N/A SPI bus test points
J8,J9,J10,J11 1-2 SPI bus
J52 N/A SPI bus test points
Table 4. Jumper settings for LEDs
Jumper Default setting Comment
J64 1-2 D2 - Blue LED 1-2: Not measuring D2 current Open: Use current meter
to measure D2 current
J116 Open D2 - Blue LED 1-2: Bypass D2 LED Open: Use D2 LED
J82 1-2 D3 - Blue LED 1-2: Not measuring D3 current Open: Use current meter
to measure D3 current
J81 Open D3 - Blue LED 1-2: Bypass D3 LED Open: Use D3 LED
J98 1-2 D4 - Blue LED 1-2: Not measuring D4 current Open: Use current meter
to measure D4 current
J97 Open D4 - Blue LED 1-2: Bypass D4 LED Open: Use D4 LED
J66, J69, J72 1-2 D5 - RGB LED 1-2: Not measuring D5 current Open: Use current meter
to measure D5 current
J67, J70, J71 Open D5 - RGB LED 1-2: Bypass D5 LED Open: Use D5 LED
J100, J101, J104 1-2 D6 - RGB LED 1-2: Not measuring D6 current Open: Use current meter
to measure D6 current
J99, J102, J103 Open D6 - RGB LED 1-2: Bypass D6 LED Open: Use D6 LED
J83, J85, J88 1-2 D7 - RGB LED 1-2: Not measuring D7 current Open: Use current meter
to measure D7 current
J84, J86, J87 Open D7 - RGB LED 1-2: Bypass D7 LED Open: Use D7 LED
J106 1-2 D8 - Infrared LED 1-2: Not measuring D8 current Open: Use current
meter to measure D8 current
J105 Open D8 - Infrared LED 1-2: Bypass D8 LED Open: Use D8 LED
J74 1-2 D9 - Infrared LED 1-2: Not measuring D9 current Open: Use current
meter to measure D9 current
J73 Open D9 - Infrared LED 1-2: Bypass D9 LED Open: Use D9 LED
J90 1-2 D10 - Infrared LED 1-2: Not measuring D10 current Open: Use current
meter to measure D10 current
J89 Open D10 - Infrared LED 1-2: Bypass D10 LED Open: Use D10 LED
J107, J110, J112 1-2 D11 - RGB LED 1-2: Not measuring D11 current Open: Use current
meter to measure D11 current
J108, J109, J111 Open D11 - RGB LED 1-2: Bypass D11 LED Open: Use D11 LED

NXP Semiconductors UM11196
PCA9957 Evaluation board OMPCA9957LEDEV
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
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Jumper Default setting Comment
J75, J77, J80 1-2 D12 - RGB LED 1-2: Not measuring D12 current Open: Use current
meter to measure D12 current
J76, J78, J79 Open D12 - RGB LED 1-2: Bypass D12 LED Open: Use D12 LED
J91, J93, J96 1-2 D13 - RGB LED 1-2: Not measuring D13 current Open: Use current
meter to measure D13 current
J92, J94, J95 Open D13 - RGB LED 1-2: Bypass D13 LED Open: Use D13 LED
Table 5. Jumper settings for SMB connectors
Jumper Default setting Comment
J12 N/A VDD SMB connector
J13 N/A /RESET pin SMB connector
J14 N/A VDDIO SMB connector
J15 N/A SDO pin SMB connector
J16 N/A SCLK pin SMB connector
J17 N/A SDI pin SMB connector
J18 N/A /CS pin SMB connector
J19 N/A /OE pin SMB connector
J20 N/A NCTest_VSS_OSCIN SMB connector
J21 N/A NCTest_OSCOUT SMB connector
J22 N/A REXT pin SMB connector
J23 - J30 N/A LED 0 - 7 pin SMB connector
J31, J40, J49-J51 N/A GND SMB connector
J32 - J39 N/A LED 8 - 15 pin SMB connector
J41 - J47, J164 N/A LED 16 - 23 pin SMB connector
Table 6. Jumper settings for banana connectors
Jumper Default setting Comment
J53 N/A VDD banana connector
J54 N/A VDDIO banana connector
J55 N/A /OE pin banana connector
J56 N/A /RESET pin banana connector
J57 - J60 N/A GND banana connector
J61 N/A 3V3_MCU banana connector
J62 N/A 3V_MCU banana connector
J165 N/A 1V8 banana connector