NXP Semiconductors PCA9745B User manual

UM11009
PCA9745B demonstration board OM13524
Rev. 1 — 23 June 2016
User manual
Document information
Info
Content
Keywords
SPI-bus, PCA9745B, RGB and White LEDs, 16-channel x 8-bit PWMs
Abstract
The OM13524 demo board is easy to test and design for the PCA9745B,
a 16-channel SPI 4-wire bus 57 mA constant current and outputs allow up
to 20 V for LED supply. This demo board, along with the Win-I2CUSB
hardware board or Fm+ development board (OM13260), provides an
easy to use evaluation platform.

NXP Semiconductors
UM11009
PCA9745B demonstration board OM13524
UM11009
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2016. All rights reserved.
User manual
Rev. 1 — 23 June 2016
2 of 28
Contact information
For more information, please visit:
http://www.nxp.com
Revision history
Rev
Date
Description
1
20160623
Initial version

NXP Semiconductors
UM11009
PCA9745B demonstration board OM13524
UM11009
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2016. All rights reserved.
User manual
Rev. 1 — 23 June 2016
3 of 28
1. Introduction
The PCA9745B 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 PC platform.
2. Features
• A complete evaluation platform for the PCA9745B 16-channel SPI-bus constant
current LED driver
• Easy to use GUI based software demonstrates the capabilities of the PCA9745B
• On-board four white and four RGB LEDs for visual experience
• Convenient test points for easy scope measurements and signal access
• USB interface to the host PC
• No external power supply required
3. Getting started
3.1 Assumptions
Familiarity with the SPI-bus is helpful but not required.
3.2 Static handling requirements
3.3 Minimum system requirements
• PC Pentium 60 processor (or equivalent), 8 MB RAM, 10 MB of hard drive space
• One USB port (either 2.0 or 1.1 compatible)
• Windows 98SE, ME, 2000, XP, or Vista
• Fm+ development board (OM13260) or WIN-I2CUSB board (from
www.demoboard.com)
3.4 Power requirements
The NXP demonstration boards OM13260 and OM13524 hardware obtain power from
the PC USB port. Care should be taken not to exceed the USB port current capabilities.
CAUTION
This device is sensitive to Electro Static 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.

NXP Semiconductors
UM11009
PCA9745B demonstration board OM13524
UM11009
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2016. All rights reserved.
User manual
Rev. 1 — 23 June 2016
4 of 28
4. Installation
4.1 Fm+ development board and WIN-SPIUSB software
The OM13524 is a daughter card to the OM13260 Fm+ I2C bus development board with
SPI driver which is part of the Fm+ development board kit (OM13320). You may
download the software, user manual, and find ordering information at the NXP web site:
http://www.nxp.com/demoboard/OM13320.html#documentation
The Win-SPIUSB software from The Boardshop runs on Windows 98SE, ME, 2000, and
XP and is compatible with any PC hardware having a minimum of a Pentium processor
and an USB port. The software allows the user to select one of the SPI-bus driver from a
menu and also provides a Universal mode (SPI Expert mode) to allow users to create
their own SPI-bus commands with the same SPI-bus devices.
4.2 OM13524 connection to Fm+ I2C bus development board
The OM13260 Fm+ I2C bus development board should be disconnected from your PC
before connecting the OM13524 PCA9745B demo board on to it. The OM13524 board
has a 9-pin male connector (CON1) that connects to the 8-pin male connector (CN16) on
the Fm+ I2C bus development board using six jumper wires as shown in the Fig 1.
CON1(9-pin)  CN16 (8-pin)
3.3V (pin 4)  +3V3 (pin 2)
SCL (pin 5)  MCU_SCLK (pin 4)
GND (pin 6)  GND (pin 7)
SDA (pin 7)  MCU_MOSI (pin 3)
SPI_SDO (pin 8)  MCU_MISO (pin 1)
SPI_CSN (pin 9)  MCU_SSN (pin 6)

NXP Semiconductors
UM11009
PCA9745B demonstration board OM13524
UM11009
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2016. All rights reserved.
User manual
Rev. 1 — 23 June 2016
5 of 28
Fig 1. PCA9745B demo board (OM13524) connecting to the Fm+ development board (OM13260)
4.3 OM13524 connection to WIN-I2CUSB hardware adapter board
The Win-I2CUSB board should be disconnected from your PC before connecting the
OM13524 PCA9745B demo board on to it. The OM13524 board has a 9-pin male
connector (CON1) that connects to the 14-pin male connector (J1) on the Win-I2CUSB
board using six jumper wires as shown in the Fig 2.
CON1(9-pin)  J1 (14-pin)
3.3V (pin 3)  3.3V (pin 2)a
SCL (pin 5)  SCLK (pin 4)
GND (pin 6)  GND (pin 6)
SDA (pin 7)  MOSI (pin 8)
SPI_SDO (pin 8)  MISO (pin 10)
SPI_CSN (pin 9)  SSN (pin 12)
Connect 6-jumper wires between the OM13524 board and the Win-I2CUSB board before
connecting the USB cable. Once both boards are connected, connect the USB cable and
start the Win-SPIUSB software. You are now ready to evaluate the PCA9745B.

NXP Semiconductors
UM11009
PCA9745B demonstration board OM13524
UM11009
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2016. All rights reserved.
User manual
Rev. 1 — 23 June 2016
6 of 28
Fig 2. PCA9745B demo board (OM13524) connecting to the WIN-I2CUSB board

NXP Semiconductors
UM11009
PCA9745B demonstration board OM13524
UM11009
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2016. All rights reserved.
User manual
Rev. 1 — 23 June 2016
7 of 28
Fig 3. PCA9745B demo board (OM13524)

NXP Semiconductors
UM11009
PCA9745B demonstration board OM13524
UM11009
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2016. All rights reserved.
User manual
Rev. 1 — 23 June 2016
8 of 28
5. Hardware description
Fig 3 shows the following items on the hardware:
•CON1 (9-pin male connector) is connected to SPI master device.
•CON2 (9-pin female connector) is connected to next SPI daisy-chain device.
•CON3 (5-pin male connector) is no use for PCA9745B SPI device.
•CON4 (14-pin male connector) is connected to J1 on WIN-I2CUSB hardware board
as I2C master device to drive this demo board (no connect for SPI signals)
•J1 selects VDD power for PCA9745B, connected 1-2 for VDD = 5 V and connected 2-3
for VDD = 3.3 V.
•J13 selects LED power for all LEDs, connected 1-2 for VLED = 3.3 V and connected 2-
3 for VLED = 5 V.
•J7 (7-8), J9 (9-10) and J10 (9-10) to select Vss for pin 2, SDO for pin 3 and /CS for
pin 4 respectively.
•LED[0:15] 16-channel output to drive four White LEDs (WHT_LED[1:4]) and four
RGB LEDs (RGB_LED[1:4]).
•TP2 and TP3 are GND pins for probing use.
•TP1 can be connected as external reset signal to /RESET pin when J6 is open.
•TP4 can be connected as external output enable signal to /OE pin for
blinking/dimming control when J11 is open.
•All jumpers default setting and function as shown in Table 1.
Table 1. Jumper settings for test and evaluation
Jumper
Default setting
Comment
J1
(3-pin)
2-3
(VDD = +3.3V)
This jumper is used to select V
DD
for PCA9745B
1-2: select +5V
2-3: select +3.3V
J2
(3x2-pin)
1-2
(Rext=1 K,
57 mA@max)
This 3x2 jumper is used to select Rext (pin1) value for PCA9745B
1-2: select Rext = 1K and max. o/p current is 57.3 mA
3-4: select Rext = 1.5K and max. o/p current is 38.25 mA
5-6: select Rext = 2K and max. o/p current is 28.6 mA
J3
(2-pin)
Open
Short: external 1.1K pull-up resistor for SDI on PCA9745B
Open: no external pull-up resistor for SDI on PCA9745B
J4
(2-pin)
Open
Short: external 1.1K pull-up resistor for SCLK on PCA9745B
Open: no external pull-up resistor for SCLK on PCA9745B
J5
(2-pin)
Short
Short: connect VDD_IN to V
DD
(pin28) on PCA9745B
Open: connect current meter to measure the IDD on PCA9745B
J6
(2-pin)
Open
Short: force /RESET (pin25) to GND
Open: 10K pull-up /RESET (pin25) to VDD
J7
(4x2-pin)
7-8
This 4x2 jumper is used to select input value for pin 2
Open: floating
1-2: select VDD
3-4: select pull-up with 31.6K
5-6: select pull-down with 34.8K
7-8: select GND

NXP Semiconductors
UM11009
PCA9745B demonstration board OM13524
UM11009
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2016. All rights reserved.
User manual
Rev. 1 — 23 June 2016
9 of 28
Jumper
Default setting
Comment
J8
(3-pin)
2-3
This jumper is used to select bus mode
1-2: select normal I2C or SPI addressable bus mode
2-3: select SPI daisy-chain bus mode for PCA9745B
J9
(5x2-pin)
9-10
This 5x2 jumper is used to select input value for pin 3
Open: floating
1-2: select VDD
3-4: select pull-up with 31.6K
5-6: select pull-down with 34.8K
7-8: select GND
9-10: SDO for last slave device of PCA9745B in SPI daisy-chain
J10
(5x2-pin)
9-10
This 5x2 jumper is used to select input value for pin 4
Open: floating
1-2: select VDD
3-4: select pull-up with 31.6K
5-6: select pull-down with 34.8K
7-8: select GND
9-10: CSN (Chip Select) SPI bus mode for PCA9745B
J11
(2-pin)
Short
Short: force /OE (pin5) to GND, to enable LEDs output
Open: 10K pull-up /OE (pin5) to VDD when apply external clock for
blinking/dimming on TP4 (test point)
J12, J16 J19,
J22
(2-pin)
Short
These jumpers are used to open the WHT_LED1 or RGB_LED1
J12 to control white LED, J16 to control Red LED, J19 to control Green
LED, J22 to control Blue LED
Open: connect current meter to measure one of the LEDs output current or
open one of the LEDs output for detecting an LED open condition in one of
EFLAGn register
Short: normal operation for WHT_LED1 and RGB_LED1
J13
(3-pin)
1-2
(VLED = +3.3V)
This jumper is used to select LED supply voltage
1-2: select +3.3V for all LEDs supply voltage
2-3: select +5V for all LEDs supply voltage
Open (no jumper): select external voltage from J20 (≤ +20V) and J24
(GND)
J14, J18 (2-pin)
Open
These jumpers are used to merge the LED[0:2] outputs together for driving
higher LED current.
Open: normal operation for the LED[0:2]
Short: When short J14/J18 and open J16/J19 to combine LED[0:2] outputs
to drive LED0. When short J14 only and open J16 to combine LED[0:1]
outputs to drive LED0
J15, J17 J21,
J23
(2-pin)
Open
These jumpers are used to short the WHT_LED1 or RGB_LED1
J15 to control white LED, J17 to control Red LED, J23 to control Green
LED, J21 to control Blue LED
Open: normal operation for WHT_LED1 and RGB_LED1
Short: to short one of the LEDs for detecting an LED short condition in one
of EFLAGn register
J20
(2-pin)
+20V
Input
External ≤ +20V input for LEDs supply voltage
The J13 must be OPEN to supply this ≤ +20V external voltage to all LEDs.

NXP Semiconductors
UM11009
PCA9745B demonstration board OM13524
UM11009
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2016. All rights reserved.
User manual
Rev. 1 — 23 June 2016
10 of 28
Jumper
Default setting
Comment
J24
(2-pin)
GND
External GND input for LEDs supply voltage
J25, J27 J29,
J31
(2-pin)
Short
These jumpers are used to open the WHT_LED4 or RGB_LED4
J25 to control white LED, J27 to control Red LED, J29 to control Green
LED, J31 to control Blue LED
Open: connect current meter to measure one of the LEDs output current or
open one of the LEDs output for detecting an LED open condition in one of
EFLAGn register
Short: normal operation for WHT_LED4 and RGB_LED4
J26, J28 J30,
J32
(2-pin)
Open
These jumpers are used to short the WHT_LED4 or RGB_LED4
J26 to control white LED, J28 to control Red LED, J32 to control Green
LED, J30 to control Blue LED
Open: normal operation for WHT_LED4 and RGB_LED4
Short: to short one of the LEDs for detecting an LED short condition in one
of EFLAGn register
CON1
9-pin male connector
This 9-pin male connector is connected to SPI master device or next daisy-
chain device
CON2
9-pin female connector
This 9-pin female connector is connected to next SPI daisy-chain device
CON3
5-pin male connector
No use for PCA9745B SPI device
CON4
14-pin
header
This 14-pin header is used to connect to Win-I2CUSB hardware board as
I2C master device to drive this demo board (no use for PCA9745B)
TP1
Test Point 1
This TP1 is used to drive /RESET input pin25 from external when J6 is
OPEN
TP2, TP3
Test Point 2/3
These two test points are GND for probe ground connection
TP4
Test Point 4
This TP4 is used to drive /OE input pin5 from external when J11 is OPEN