NXP Semiconductors UM10574 User manual

UM10574

PCA9685 demonstration board OM13332

Rev. 1 — 1 April 2014 User manual

Document information

Info Content

Keywords Fm+ I2C-bus, PCA9685, RGB and White LEDs, 16 channel x 12-bit PWMs

Abstract The OM13332 is an add-on to 9-pin connector of the NXP I2C demo board 2005-1

or Fm+ I2C Bus development board. This daughter board makes it easy to test

and design with the PCA9685, the LED output driver is programmed to be either

open-drain with a 25 mA current sink capability at 5 V or totem pole with a 25 mA

sink. The PCA9685 operates with a supply voltage range of 2.3 V to 5.5 V and the

inputs and outputs are 5.5 V tolerant. This demo board, along with the

Win-I2CUSB Lite GUI (PC based), provides an easy to use evaluation platform.

User manual Rev. 1 — 1 April 2014 2 of 14

Contact information

For more information, please visit: http://www.nxp.com

For sales office addresses, please send an email to: [email protected]

NXP Semiconductors UM10574

PCA9685 demonstration board OM13332

Revision history

Rev Date Description

1.0 20140401 user manual; initial release

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NXP Semiconductors UM10574

PCA9685 demonstration board OM13332

1. Introduction

The PCA9685 evaluation board features LEDs for color backlighting and Ambilight

demonstrations. A graphical interface allows the user to explore the different functions of

the driver easily. The board can be connected in series with other I2C demo-boards to

create an evaluation system.

The IC communicates to the host via the industry standard I2C-bus/SMBus port. The

evaluation software runs under Microsoft Windows PC platform.

2. Features

•A complete evaluation platform for the PCA9685 16-channel, 12-bit PWM Fm+

I2C-bus 25 mA voltage switch LED driver

•Easy to use GUI-based software demonstrates the capabilities of the PCA9685

•On-board RGB and White 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 I2C-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

•I2C demonstration board 2005-1 (OM6275) or WIN-I2CUSB board (from

www.demoboard.com).

3.4 Power requirements

The NXP demonstration board I2C 2005-1 and OM13332 hardware obtain power from the

PC USB port. Take care not to exceed the USB port current capabilities.

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.

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PCA9685 demonstration board OM13332

4. Installation

4.1 I2C demo board 2005-1 and WIN-I2CUSB Lite software

The OM13332 is a daughter card to the OM6275 I2C demo board 2005-1. You can

download the WIN-I2CUSB Lite Software, the OM6275 user manual UM10206, and find

ordering information at the NXP web site www.nxp.com/demoboard/OM6275.html.

The Win-I2CUSB Lite 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 a USB port. The software allows the user to select one of the I2C-bus

devices on the board from a menu and also provides a Universal mode (I2C Expert mode)

to allow users to create their own I2C-bus commands with the same I2C-bus devices.

4.2 OM13332 connection to I2C demo board 2005-1

The I2C demo board 2005-1 should be disconnected from your PC before mounting the

OM13332 board on to it. The OM13332 board has a 9-pin female connector (J2) that

connects to the JP1 male connector on the I2C demo board 2005-1 as shown in Figure 1.

With both boards facing you, with USB connector on the left-hand side as shown in

Figure 1, connect the OM13332 board to the I2C demo board 2005-1 before connecting

the USB cable. Once the board is connected, connect the USB cable and start the

WIN-I2CUSB Lite software. You are now ready to evaluate the PCA9685.

Fig 1. PCA9685 demo board (OM13332) mounting to the I2C demo board 2005-1 (OM6275)

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NXP Semiconductors UM10574

PCA9685 demonstration board OM13332

4.3 OM13332 connection to Win-I2CUSB hardware adapter board

The Win-I2CUSB board should be disconnected from your PC before connecting the

OM13332 board on to it. The OM13332 board has a 14-pin male connector (J4) that

connects to the 14-pin male connector (J1) on the Win-I2CUSB board as shown in

Figure 2.

Connect the OM13332 board to the Win-I2CUSB board before connecting the USB cable.

Once the board is connected, connect the USB cable and start the WIN-I2CUSB Lite

software. You are now ready to evaluate the PCA9685.

Fig 2. PCA9685 demo board (OM13332) connecting to the Win-I2CUSB board

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PCA9685 demonstration board OM13332

5. Hardware description

Figure 3 shows the following items on the hardware:

•J2 (9-pin) is for connection to JP1 on I2C demo board 2005-1.

•J3 (9-pin male) is for connection to the second PCA9685 demo board or I2C-bus

device.

•J1 selects VDD power for PCA9685, connected 1-2 for VDD = 3.3 V and connected 2-3

for VDD = 5 V.

•S1 8-position DIP switch to select I2C-bus address A[0:5] = S1[1:6] for this device

(default is 0x80, all switches S1[1:6] are ON position). S1[7] is used to control output

enable (/OE, default is ON position to enable LED outputs), S1[8] is used to control

EXTCLK (default is ON position to disable the EXTCLK).

•J4 (14-pin) is for connection to J1 on Win-I2CUSB board.

•4-channel to drive four White LEDs (D2, D4, D6, D9) and 12-channel to drive four

RGB LEDs (D3, D5, D7, D8).

•/OE (TP1) is input to drive output enable (pin 23) when S1[7] is set to OFF position.

•EXTCLK (TP2) is input to EXTCLK (pin 25) when S1[8] is set to OFF position.

•J5 and J6 are GND pins for probing use.

Fig 3. PCA9685 demo board (OM13332)

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xxxxx xxxxxx xx xxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxx xxxxxxx xxxxxxxxxxxxxxxxxxx

xxxxxxxxxxxxxxxx xxxxxxxxxxxxxx xxxxxx xx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxx xxxxxxx

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxx xxxxx x x

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PCA9685 demonstration board OM13332

6. Schematic

Fig 4. PCA9685 demo board schematic

019aac802

+5 V

+3.3 V

SCL_1

10 μF

9-pin female

connector

SDA_1

GND

10 μF

9-pin connector to/from I2C 2005-1

or to/from PCA9685 demo board

1GND

2I/O1

VCC

I/O2

close to connector J2/J4

PRTR5V0U2AX

C23

0.01 μF

+5 V

BLM18BD471SN1

SDA_1 SDA-filter

BLM18BD471SN1

SCL_1 SCL-filter

(470 Ω at 100 MHz)

1GND

2I/O1

VCC

I/O2

close to 9-pin connector J3

PRTR5V0U2AX

C24

0.01 μF

+5 V

BLM18BD471SN1

SDA_2 SDA-filter

BLM18BD471SN1

SCL_2 SCL-filter

(470 Ω at 100 MHz)

0.1 nF

C10

0.1 nF

C11

0.1 nF

C12

0.1 nF

C13

0.1 nF

C14

0.1 nF

C15

0.1 nF

C16

0.1 nF

C17

0.1 nF

C18

0.1 nF

C19

0.1 nF

C20

0.1 nF

C21

0.1 nF

C22

0.1 nF

LED0

LW-E67C-white

+5 V

D3 LED[1:3]

LRTB_G6SG

LED4

LW-E67C-white

R10 440 Ω

R11 1.16 kΩ

R12 720 Ω

R13 720 Ω

LED0

LED1

LED2

LED3

R14 440 Ω

R15 1.16 kΩ

R16 720 Ω

LED4

LED5

LED6

R17 720 Ω

R18 440 Ω

R19 1.16 kΩ

LED7

LED8

LED9

R20 720 Ω

R21 720 Ω

R22 440 Ω

LED10

LED11

LED12

R23 1.16 kΩ

R24 720 Ω

R25 720 Ω

LED13

LED14

LED15

D5 LED[5:7]

LRTB_G6SG

LED8

LW-E67C-white

D7 LED[9:11]

LRTB_G6SG

LED12

LW-E67C-white

D8 LED[13:15]

LRTB_G6SG

GND

VP for I2C pull-up VDD

on WIN-I2CUSB board

PCA9685PW

LED0

LED1

LED3

LED2

LED0

LED1

LED3

LED2

LED4

LED6

LED5 LED4

LED6

LED5

LED7 LED7

VSS

24 A5

EXTCLK

SDA

SCL

EXTCLK

VDD

/OE

LED15

LED13

LED14

/OE

LED15

LED13

LED14

LED12

LED10

LED11

LED12

LED10

LED11

LED9

LED8

LED9

LED8

SW1

SW DIP-8

R1 10 kΩ

R2 10 kΩ

R3 10 kΩ

R4 10 kΩ

VDD_IN

(output enable)

TP2 1

SDA filter

SCL filter R9

1 kΩ

+3.3 V +5 V

VDD_IN

0.1 μF

4.7 μF

LTST-C170KGKT

limited the current to 2.5 mA

white LED VF= 3.9 V

red LED VF= 2.1 V

green/blue LED VF= 1.8 V

4SCL_1

(VP) VDO_IN

GND

SDA_1

14 +5 V

GND

+3.3 V

14-pin connector to/from WIN-I2CUSB

Fm+ I2C master to drive PCA9685

HEADER 7x2/SM

I2CUSB CONNECTOR

R5 10 kΩ

R6 10 kΩ

R7 10 kΩ

R8 10 kΩ

EXTCLK

TP1 1 /OE

(external clock in)

(switched to GND when

external clock is not used)

+5 V

+3.3 V

5SCL_2

10 μF

9-pin female

connector

7SDA_2

GND

10 μF

9-pin connector to/from I2C 2005-1

or to/from PCA9685 demo board

User manual Rev. 1 — 1 April 2014 8 of 14

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PCA9685 demonstration board OM13332

7. OM13332 demonstration board main components

8. PCA9685 evaluation steps

The PCA9685 functions are controlled by WIN-I2CUSB Lite GUI. Refer to the PCA9685

data sheet for additional information on the registers and functionality.

Connect the hardware as described in Section 4. The PCA9685 demo board address is

set to 0x80 on DIP switch (S1) as A[0:5] = S1[1:6] = 000000 (0 →ON, 1 →OFF). When

you have correctly installed the software and the demonstration board hardware is

connected and recognized by the computer, start the Win-I2CUSB Lite software. As

shown in Figure 5, when the demonstration board hardware is correctly connected to the

USB port and the computer recognizes it, the message ‘Hardware Detected’ is displayed

on the bottom of the window.

Switched 3.3 V and 5.0 V power supplies are controlled through the ‘Options’ menu or by

double-clicking on the 3.3 V or 5.0 V symbols on the bottom of the window. Power

supplies are disabled by default and you must enable them before using the I2C-bus

devices on the board. I2C-bus frequency is controlled through the ‘Options’ menu or by

double-clicking the frequency symbol on the bottom of the window.

8.1 Dimming and brightness control for individual LED

The PCA9685 has 4096 steps (12-bit PWM) of individual LED brightness control to vary

from fully off (default) to maximum brightness. The LED output frequency (all LEDs)

typically varies from 24 Hz to 1526 Hz (default of 1Eh in PRE_SCALE register results in a

197 Hz refresh rate with oscillator clock of 25 MHz). The duty cycle of PWM can be

controlled independently using the ‘LEDn ON’ and ‘LEDn OFF’ registers. The resolution

for the phase shift is 1⁄4096 of the target frequency.

1. From the ‘Device’ drop-down menus, select ‘LED Blinkers and Dimmers’, and from

the subsequent drop-down menu select ‘PCA9685 16-channel LED Driver with 12-bit

PWM’ as shown in Figure 5.

2. The device address is set to ‘80’ hexadecimal and cannot change. Check the ‘Auto

Write On’ box (lower left), uncheck the ‘Low-power mode (oscillator off)’ box to enable

the device to ‘Normal mode’ (upper left).

Table 1. OM13332 demo board main components

Device Description Address/LED output Location

PCA9685PW 16-channel, 12-bit PWM Fm+ I2C-bus

25 mA voltage switch LED driver 0x80 for I2C demo board 2005-1

interface U1

LW-E67C White LED LED0, LED4, LED8, LED12 D2, D4, D6, D9

LRTB_G6SG RGB LED LED1, LED2, LED3 D3

LRTB_G6SG RGB LED LED5, LED6, LED7 D5

LRTB_G6SG RGB LED LED9, LED10, LED11 D7

LRTB_G6SG RGB LED LED13, LED14, LED15 D8

LTST-C170KGKT Green LED for PCA9685 power supply

either 3.3 V or 5 V indicator -D1

User manual Rev. 1 — 1 April 2014 9 of 14

NXP Semiconductors UM10574

PCA9685 demonstration board OM13332

3. For LED output that directly connects to LED as the demo board design, the INVRT

bit in MODE2 register must be set to 1 by checking the ‘Output not inverted’ to ‘Output

inverted’ and the OUTDRV bit in MODE2 register must be set to 0 by checking the

‘Totem pole outputs’ to ‘Open-drain outputs’ to make sure all LEDs are completed

OFF state as shown in Figure 6.

4. The device configuration screen is displayed by clicking the following options:

–‘PWM 0 to 3’ individual brightness control for LED0 to LED3

–‘PWM 4 to 7’ individual brightness control for LED4 to LED7

–‘PWM 8 to 11’ individual brightness control for LED8 to LED11

–‘PWM 12 to 15’ individual brightness control for LED12 to LED15

–‘Control Registers’ all LED[0:15] brightness control and Prescale for all LEDs

output frequency as shown in Figure 7

5. In Figure 6, uncheck the ‘LEDn Full Off’ box (lower bottom), adjust both ‘LEDn ON’

and ‘LEDn OFF’ bar for dimming/brightness effect, also move LED1 ON/OFF to

control red, LED2 ON/OFF to control green, LED3 ON/OFF to control blue for color

mixing.

Remark: The LED ON time, which is programmable, is the time to assert the LED output

and the LED OFF time, which is also programmable, is the time to negate the LED output.

Fig 5. Drop-down menu selections

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PCA9685 demonstration board OM13332

Fig 6. Device configuration screen for PWM0 to PWM3

Fig 7. Device configuration screen Control registers

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