NXP Semiconductors UM10856 Manuale utente

UM10856

User manual for dI2C demo board

Rev. 1.1 — 10 July 2017 User manual

Document information

Info Content

Keywords dI2C-bus, differential I2C-bus buffer, PCA9614, PCA9615, PCA9616

Abstract User manual for the dI2C demo board OM13523. This demo board will

make it easy to test and design with PCA9614, PCA9615 and PCA9616, a

differential I2C-bus buffer.

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User manual Rev. 1.1 — 10 July 2017 2 of 13

Contact information

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

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

NXP Semiconductors UM10856

User manual for dI2C demo board

Revision history

Rev Date Description

1.1 20170710 Corrected demo board name to OM13523.

1 20150713 Initial version.

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NXP Semiconductors UM10856

User manual for dI2C demo board

1. Introduction

The dI2C demo board OM13523 is for demonstration of the differential I2C-bus working

better in noise and ground offset environment than standard I2C-bus. The two dI2C demo

boards can be used to see the improvement of signal integrity in a noisy environment or a

system that has many different power sources creating different ground offset.

In the system block diagram (Figure 1), the I2C-bus between the Boot Bus Controller and

the CPU/Memory board has a lot of high speed data transmission; therefore the I2C-bus

may pick up some noise. The fan and power supply modules may have different power

sources; they may have a different ground offset level. To make a better I2C-bus system,

install dI2C devices to isolate noise and ground offset in a system.

This user manual shows how to use a dI2C demo board on an existing system.

2. Key features

•A complete evaluation platform for PCA9616, (or PCA9614 and PCA9615)

•Easy to connect to an existing system

•Convenient test point for easy scope measurement and signal access

Fig 1. Typical application

Centerplane Board

CPU/Memory

Board

CPU/Memory

Board

Boot Bus

Controller

Fan

Power

Supply

Power

Supply

Disk controller

Ethernet controller

USB controller

Temp

sensor

Temp

sensor

Data Switch

dI2C

dI2CdI2CdI2C

dI2C

Normal I2C-bus cable

Cat5, twist pair cable

Noise area

PCI slot

DVD controller

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NXP Semiconductors UM10856

User manual for dI2C demo board

3. Getting started

3.1 Assumptions

Familiarity with the I2C-bus is recommended.

3.1.1 Static handling requirements

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.

3.1.2 System requirement

The OM13523 demo card can be used with Fm+ Development Board (OM13260), or

customer's application system.

3.1.3 Schematic of dI2C demo board

Fig 2. Schematic of dI2C demo board

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NXP Semiconductors UM10856

User manual for dI2C demo board

3.1.4 Bill of materials

Fig 3. OM13523 dI2C demo board

Table 1. Bill of materials

Part Value Package Part # Description

C1 100n C0603 399-1095-1-ND SMD capacitor

C2 22uF/16V A/3216-18R 1276-2728-1-ND SMD capacitor

C3 22uF/16v A/3216-18R 1276-2728-1-ND SMD capacitor

C4 100n C0603 399-1095-1-ND SMD capacitor

CON1 MA08-1 MA08-1 609-3235-ND dI2C part connector 1

CON2 MA08-1 MA08-1 609-3235-ND dI2C part connector 2

CON4 MA04-2 MA04-2 609-3203-ND Cable connector

JP1 MA03-1 1X03 WM8073-ND Part selector header

JP2 MA02-1 1X02 WM8072-ND VDDB power selector

header

R1 604R M1206 541-604FCT-ND Terminator resistor

R10 10K R0603 1276-5930-2-ND EN, pull-up resistor

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NXP Semiconductors UM10856

User manual for dI2C demo board

3.1.5 Power supply

The dI2C demo board needs two power supplies for I2C-bus (VDDA) and dI2C-bus

(VDDB).

•Using Fm+ Development Board (Fm+ DB): There is no direct connector to the Fm+

DB. The dI2C demo board can draw the power from an Fm+ DB using either 3.3 V

headers (CN21) or 5 V headers (CN22) to the VDDA of CON1 on the dI2C demo

board. VDDB can use the same power as VDDA by connecting JP2, or using jumper

wire from CN21 or CN22 of Fm+ DB (see Figure 4).

R11 NI 0204/7 NONE Terminator resistor op

R12 10K R0603 1276-5930-2-ND INT, pull-up resistor

R13 NI 0204/7 NONE Terminator resistor op

R14 NI 0204/7 NONE Terminator resistor op

R15 NI 0204/7 NONE Terminator resistor op

R16 NI 0204/7 NONE Terminator resistor op

R17 NI 0204/7 NONE Terminator resistor op

R18 NI 0204/7 NONE Terminator resistor op

R19 NI 0204/7 NONE Terminator resistor op

R2 121R M1206 541-131FCT-ND Terminator resistor

R20 NI 0204/7 NONE Terminator resistor op

R3 604R M1206 541-604FCT-ND Terminator resistor

R31 10K M1206 1276-5930-2-ND Pull-up resistor

R32 10K R0603 1276-5930-2-ND !Ready, pull-up resistor

R4 604R M1206 541-604FCT-ND Terminator resistor

R5 121R M1206 541-131FCT-ND Terminator resistor

R6 604R M1206 541-604FCT-ND Terminator resistor

R7 604R M1206 541-604FCT-ND Terminator resistor

R8 121R M1206 541-131FCT-ND Terminator resistor

R9 604R M1206 541-604FCT-ND Terminator resistor

TP1 TP_GND TP_GND 952-1873 GND

U1 PCA9410 TSSOP16_4X4MM PCA9616 dI2C part

X1 A31465-ND RJ45-NO-SHIELD A31465-ND Internet connector

Table 1. Bill of materials …continued

Part Value Package Part # Description

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User manual for dI2C demo board

•User application board: CON1 pin VDDA is for the I2C-bus power and CON2 pin

VDDB is for dI2C-bus power. On an application board, the I2C-bus pull-up power

should connect to the VDDA power. VDDB is the power for PCA9616 and differential

bus signals. VDDB can be set the same as VDDA by adding a jumper header on JP2,

if VDDA is between 3.0 V and 5.0 V.

3.1.6 I2C-bus side

The I2C-bus on the dI2C demo board does not have the pull up resistors on SLC and SDA

signals. The pull-up resistors should be taken care of by the I2C master board (Fm+ DB or

application board).

INT signal can be used as an interrupt signal to the microcontroller or a reset signal to the

slave devices. The INT signal has a 10K pull-up to VDDB on the dI2C demo board.

Fig 4. Power connector

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NXP Semiconductors UM10856

User manual for dI2C demo board

3.1.7 dI2C-bus side

dI2C-bus has three pairs of differential signals on the dI2C demo board. All of the pairs

are connected to RJ45 through the termination resistors. Please see schematic (Figure 6)

for more detail. RJ45 is internet connector; it can use cat5/6 cable to connect to the other

dI2C board. A user can have his or her own cable and it can be connected to CON4.

Fig 5. I2C-bus connection

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NXP Semiconductors UM10856

User manual for dI2C demo board

3.1.8 Other signals

The dI2C demo board is designed ready to use; therefore, all other signals have been set

to running mode. Please see the schematic in Figure 2 for more detail.

4. How to run a demo on Fm+ board with dI2C demo board

4.1 How to connect dI2C to Fm+ DM

1. dI2C demo board #1: connect SCL, SDA, VDDA and GND to SCL1, SDA1, 3.3V and

GND of Fm+ DM #1 respectively.

2. dI2C demo board #2: connect SCL, SDA, VDDA and GND to SCL2, SDA2, 3.3V and

GND of Fm+ DM #2 respectively.

3. Use a CAT6 cable to connect the two dI2C DMs together

4. Install jumpers on both dI2C demo boards JP2 and JP1 (PIDET - VDDAPU)

5. Connect GPIO target board: the first GPIO target board connects to CN10 of Fm+

board #1 and the second one connects to CN20 of Fm+ board #2

Fig 6. Differential bus connectors

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NXP Semiconductors UM10856

User manual for dI2C demo board

4.2 Fm+ DM source code for expert mode

Expert Mode Data File

//Hardware setup: Two Fm+ boards OM13260, two dI2C demo boards OM13523, CAT6 cable,

and two GPIO Target boards OM13303

//Fm+ DB#1, install jumper on JP10 = GND; no jumper on CN12; connect OM13303 board to

CN10 on Fm+ DM#1

//Fm+ DB#2, install jumper on JP20 = GND; no jumper on CN12; connect OM13303 board to

CN20 on Fm+ DM#2

//dI2C DB OM13523, JP2 =1&2; JP1=1&2

44,Write,Yes,200,FE,Comments: Please open this file in text editor for boards setup

44,Write,Yes,200,FE,Comments: Write to PCA9672 addr 0x44 on bus #1; set bit0=0

44,Write,Yes,200,FD,Comments: Write to PCA9672 addr 0x44 on bus #1; set bit1=0

44,Write,Yes,200,FB,Comments: Write to PCA9672 addr 0x44 on bus #1; set bit2=0

44,Write,Yes,200,F7,Comments: Write to PCA9672 addr 0x44 on bus #1; set bit3=0

44,Write,Yes,200,EF,Comments: Write to PCA9672 addr 0x44 on bus #1; set bit4=0

44,Write,Yes,200,DF,Comments: Write to PCA9672 addr 0x44 on bus #1; set bit5=0

44,Write,Yes,200,BF,Comments: Write to PCA9672 addr 0x44 on bus #1; set bit6=0

44,Write,Yes,200,7F,Comments: Write to PCA9672 addr 0x44 on bus #1; set bit7=0

//The data below are sent from bus1 through dI2C buffer to bus2 to drive PCA9672

46,Write,Yes,200,7F,Comments: Write to PCA9672 addr 0x46 on bus #2; set bit7=0

46,Write,Yes,200,BF,Comments: Write to PCA9672 addr 0x46 on bus #2; set bit6=0

46,Write,Yes,200,DF,Comments: Write to PCA9672 addr 0x46 on bus #2; set bit5=0

46,Write,Yes,200,EF,Comments: Write to PCA9672 addr 0x46 on bus #2; set bit4=0

46,Write,Yes,200,F7,Comments: Write to PCA9672 addr 0x46 on bus #2; set bit3=0

46,Write,Yes,200,FB,Comments: Write to PCA9672 addr 0x46 on bus #2; set bit2=0

46,Write,Yes,200,FD,Comments: Write to PCA9672 addr 0x46 on bus #2; set bit1=0

46,Write,Yes,200,FE,Comments: Write to PCA9672 addr 0x46 on bus #2; set bit0=0

Sequence:01,02,03,04,05,06,07,08,09,10,11,12,13,14,15,16,17

//;results: LED GPIO target board on JP10 runs from LED7 to LED0, other LED board runs

form LED0 to LED7

4.3 Open source code in expert mode

Copy the source code in Section 4.2 above in a text file and save it with “name.txt”, then

open name.txt in expert mode of NXPs Fm+ board GUI software by selecting Device and

Expert Mode.

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