NXP Semiconductors PCA9846PW-ARD User manual

UM11759
PCA9846PW-ARD evaluation board
Rev. 1 — 6 June 2022 User manual
Document information
Information Content
Keywords PCA9846, I2C-bus, level translator, bus switch, Arduino port, EVK
Abstract The PCA9846PW-ARD evaluation board is an expansion card equipped
with Arduino port, designated for easy test and design of PCA9846 IC, four-
channel ultra-low voltage, FM+ I2C-bus switch with reset. The board is fully
compliant with IMXRT1050 EVK, LPCXpresso55S69 (LPC55S69-ECK) and
i.MX 8M Mini LPDDR4 EVK (8MMINILPD4-EVK, 8MMINID4-EVK), including
GUI software control. The board can be attached to any device equipped with
Arduino port.

NXP Semiconductors UM11759
PCA9846PW-ARD evaluation board
Rev Date Description
1 20220606 Initial version
Revision history
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IMPORTANT NOTICE
For engineering development or evaluation purposes only
NXP provides the product under the following conditions:
This evaluation kit is for use of ENGINEERING DEVELOPMENT OR
EVALUATION PURPOSES ONLY. It is provided as a sample IC pre-soldered
to a printed-circuit board to make it easier to access inputs, outputs and
supply terminals. This evaluation board may be used with any development
system or other source of I/O signals by connecting it to the host MCU
computer board via off-the-shelf cables. This evaluation board is not
a Reference Design and is not intended to represent a final design
recommendation for any particular application. Final device in an application
heavily depends on proper printed-circuit board layout and heat sinking
design as well as attention to supply filtering, transient suppression, and I/O
signal quality.
The product provided may not be complete in terms of required design,
marketing, and or manufacturing related protective considerations, including
product safety measures typically found in the end device incorporating the
product. Due to the open construction of the product, it is the responsibility of
the user to take all appropriate precautions for electric discharge. In order to
minimize risks associated with the customers’ applications, adequate design
and operating safeguards must be provided by the customer to minimize
inherent or procedural hazards. For any safety concerns, contact NXP sales
and technical support services.
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1 Introduction
This document describes the PCA9846PW-ARD evaluation board. The evaluation board
is built around the PCA9846, four-channel ultra-low voltage, FM+ I2C-bus switch with
reset, produced by NXP Semiconductors. The evaluation board serves as an expansion
board that can be connected through an Arduino port to various Arduino-compatible
EVK/motherboards with the purpose of testing and measuring the characteristics of the
PCA9846 device under test (DUT). This includes the original Arduino Uno R3.
The development board contains one PCA9846 IC (DUT) and four I2C EEPROM ICs,
connected to each channel of PCA9846 IC. The PCA9846PW-ARD expansion board
allows testing and measurement of the static and dynamic characteristics of the DUT
by accessing the EEPROMs from the Arduino port through the PCA9846 I2C switch.
PCA9846 is supplied from a programmable power supply, and each EEPROM works
at a different rail voltage. This configuration allows testing of the PCA9846 IC with
several combinations of logic levels. The programmable power supply is controlled by
the motherboard (EVK) through the same Arduino port. Power also is delivered from the
motherboard (EVK) through the Arduino port.
Additionally, a graphical user interface (Windows platform GUI) is provided to facilitate
the evaluation of the expansion board. The GUI is used with the following NXP evaluation
boards: IMXRT1050 EVK Board, LPCXpresso55S69 Development Board and i.MX 8M
Mini LPDDR4 EVK Board.
2 Finding kit resources and information on the NXP web site
NXP Semiconductors provides online resources for the evaluation board and its
supported device(s) on http://www.nxp.com.
The information page for PCA9846PW-ARD evaluation board is at http://www.nxp.com/
PCA9846PW-ARD. The information page provides overview information, documentation,
software and tools, parametrics, ordering information and a Getting Started tab. The
Getting Started tab provides quick-reference information applicable to using the
PCA9846PW-ARD evaluation board, including the downloadable assets referenced in
this document.
2.1 Collaborate in the NXP community
The NXP community is for sharing ideas and tips, ask and answer technical questions,
and receive input on just about any embedded design topic.
The NXP community is at http://community.nxp.com.
3 Getting ready
Working with the PCA9846PW-ARD requires the kit contents, additional hardware, and a
Windows PC workstation with installed software.
3.1 Kit contents
•Assembled and tested evaluation board in an antistatic bag
•Quick Start Guide
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3.2 Assumptions
Familiarity with the I2C bus is helpful but not required.
3.3 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.
3.4 Minimum system requirements
This evaluation board requires a Windows PC workstation. Meeting these minimum
specifications should produce great results when working with this evaluation board.
•Computer with Windows 10
•One USB port (either 3.0 or 2.0 or 1.1 compatible)
•One of three EVK boards (MIMXRT1050-EVK, LPC55S69-EVK, 8MMINILPD4-EVK)
along with the associated firmware/GUI software
•USB cable for power and data connection between PC and EVK board (if not included
in the EVK package)
4 Getting to know the hardware
4.1 PCA9846PW-ARD features
•Equipped with four I2C EEPROMs for rapid test and measurements
•Equipped with programmable power supply for logic level combination
•Onboard I2C-bus external connector (channel 3 and 4)
•Equipped with Arduino Uno R3 port for direct connection with Arduino devices
•Fully compliant with IMXRT1050 EVK board, including GUI (Windows 10)
•Fully compliant with LPCXpresso55S69 development board, including GUI (Windows
10)
•Compliant with i.MX Mini LPDDR4 EVK board, including GUI (Windows 10)
Note: For i.MX Mini LPDDR4 EVK Board, use IMX8MMINI-IARD interposer board
between the EVK and PCA9846PW-ARD expansion board. Refer to 11612 [10] .
4.2 Kit featured components
Figure 1 and Figure 2 identify the main components on the board. The main elements
are called out. The PCA9846 (U11) is placed in the center of the board. In Figure 1, the
EEPROMs are indicated along with the corresponding LDOs. The I2C address jumpers
(J12, J13) are placed in the upper side of the board. The user can find the power LEDs
(D1-3.3 V, D2-5 V) in the left side.
The Arduino port connectors (J1, J4, J5, J6) are indicated in Figure 2, on the bottom side
of the board.
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Figure 1. PCA9846PW-ARD top view
Figure 2. PCA9846PW-ARD bottom view
4.2.1 Arduino connectors
J1, J4, J5, and J6 are the mated pin headers of Arduino Uno R3 connectors, having the
same electrical function and placed on the board so the expansion board can be directly
inserted in the Arduino port. The expansion board uses five signal lines. Table 1 is the pin
chart of connectors and the used lines in the circuit. Also refer to the SPF-46670_A.pdf
schematic file:
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Ref Des # Arduino label PCA9846WP-ARD function
1 NC Not used
2 IOREF Not used
3 RESET Not used
4 3.3V Power supply (3.3V)
5 5V Power supply (5V)
6 GND Power supply return
7 GND Power supply return
J6 (Power)
8 Vin Not used
1 A0 Not used
2 A1 Not used
3 A2 Not used
4 A3 Not used
5 A4 / SDA I2C_SDA
J1 (analog, digital, I2C)
6 A5 / SCL I2C_SCL
1 D0 / RX MUX1_LDO1_S0
2 D1 / TX MUX1_LDO1_S1
3 D2 MUX1_LDO1_S2
4 D3 / PWM Not used
5 D4 Not used
6 D5 / PWM Not used
7 D6 / PWM Not used
J5 (digital, UART, PWM)
8 D7 Not used
1 D8 Not used
2 D9 / PWM Not used
3 D10 / SS / PWM Not used
4 D11 / MOSI / PWM Not used
5 D12 / MISO Not used
6 D13 / SCK Not used
7 GND Power supply return
8 AREF Not used
9 A4 / SDA Not used
J4 (mixed)
10 A5 / SCL Not used
Table 1. Pin chart of Arduino connectors and usage
The circuit is supplied from Arduino port through J6 and J4. Pin 4 of J6 is 3.3 V
power supply while pin 5 of J6 is 5 V power supply. Pin 6, 7 of J6, and pin 7 of J4
represents the power supply return (ground). LED D1 is the 3.3 V power supply indicator
(“VCC_3V3_MAIN” power net), and D2 is 5 V power supply indicator (“VCC_5V_MAIN”
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power net). Refer to the SPF-46670_A.pdf schematic file of PCA9846PW-ARD
expansion board.
4.2.2 Jumpers and test points
The board contains two jumpers and several test points. Table 5 and Figure 9 show the
jumper locations and their default configurations. Table 6 shows the test points located on
the PCA9846PW-ARD board.
Ref Des Label Default Description
3-5: A0 connected to GND
1-3: A0 connected to VCC_LDOOUT1
2-4: A0 connected to SCL
J12 AD0 3-5
4-6: A0 connected to SDA
3-5: A1 connected to GND
1-3: A1 connected to VCC_LDOOUT1
2-4: A1 connected to SCL
J13 AD1 3-5
4-6: A1 connected to SDA
Table 2. PCA9846PW-ARD jumpers
Figure 3. PCA9846PW-ARD Jumper locations
Ref Des Test point / jumper label Description
TP1 SDA-CH1 I2C SDA line, channel 1
TP2 SCL-CH1 I2C SCL line, channel 1
TP3 SCL I2C SCL main line
TP4 SDA I2C SDA main line
Table 3. PCA9846PW-ARD test points
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Ref Des Test point / jumper label Description
TP5 SDA-ARD I2C SDA line, Arduino port
TP7 SCL-ARD I2C SCL line, Arduino port
TP9 3V3 VCC_3V3 rail
TP10 5V0 VCC_5V0 rail
TP11 3V3_MAIN VCC_3V3_MAIN rail
TP12 5V0_MAIN VCC_5V0_MAIN rail
TP13 LDOOUT1 VCC_LDOOUT1 rail
TP15 GND Ground
TP16 GND Ground
TP17 SDA-CH2 I2C SDA line, channel 2
TP18 SCL-CH2 I2C SCL line, channel 2
TP19 SDA-CH3 I2C SDA line, channel 3
TP20 SCL-CH3 I2C SCL line, channel 3
TP21 SDA-CH4 I2C SDA line, channel 4
TP22 SCL-CH4 I2C SCL line, channel 4
TP23 1V8 VCC_1V8 rail
TP24 2V5 VCC_2V5 rail
TP25 3V6 VCC_3V6 rail
Table 3. PCA9846PW-ARD test points...continued
4.2.3 I2C bus switch/repeater
Figure 3 shows the PCA9846 I2C-bus switch/repeater (U11) section. From the Arduino
port, the I2C (SDA, SCL) lines go to the DUT through the level translator PCA9617A (U7).
The level shifter U7 assures the separation between the logic level of the Arduino port
(3.3 V) and the selected logic level of the PCA9846 (VCC_LDOOUT1). The I2C interface
of U11 is pin 14 for SCL, and pin 15 for SDA. The I2C-bus pullup resistors are R56 and
R57. The pin 3 of the DUT is RESET input (active low), and is driven by the onboard
switch SW1. SW1 resets the internal state machine of PCA9846, meaning all channels
are deselected. The address pins A0 and A1 are controlled by the jumper headers
J12 and J13. Refer to PCA9846 data sheet [1] for more details about the hardware
address selection. The default selected address is “00”, which corresponds to 0xE2h
for the 8-bit I2C-bus address. The VDD1 pin (logic level power supply) is connected to
VCC_LDOOUT1 (the programmable voltage regulator), and the VDD2 pin (core logic
power supply) is connected to VCC_1V8 voltage rail, provided by the LDO regulator U15.
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Figure 4. PCA9846PW-ARD – I2C-bus switch/repeater section
4.3 Power distribution
The VDD1 power pin of PCA9846 (U11) and the VCCA power pin of PCA9617A (U7)
are supplied from VCC_LDOUT1 rail, provided by the programmable power supply
LDO 1. This configuration allows testing and measurement of the static and dynamic
characteristics of the DUT for multiple logic levels for the I2C-bus interface (SDA and
SCL pins of PCA9846). Figure 4 shows the LDO 1 circuit. The main element of the
programmable power supply is the adjustable voltage regulator LDK120MK IC (U3).
As shown in Figure 4, in the feedback loop the analog multiplexer U18 is placed in the
feedback loop of the LDO, allowing for multiple combinations of the programmable
resistors to be selected. The result is the voltage regulator can provide multiple output
voltages for the VCC_LDOOUT1 rail. The analog multiplexer is controlled from the EVK
through the Arduino port (the connector J5, pin 1, 2, and 3). Table 3 shows the control
lines, logic level, and the available output voltages of the LDO 1 regulator.
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Figure 5. PCA9846PW-ARD – LDO 1 section
MUX1_LDO1_S2 MUX1_LDO1_S1 MUX1_LDO1_S0 VCC_LDOOUT1
Low Low Low 0.8 V
Low Low High 1.2 V
Low High Low 1.8 V
Low High High 2.5 V
High Low Low 3.3 V
High Low High
High High Low
High High High
3.6 V
Table 4. The VCC_LDOOUT1 voltages
4.4 EEPROM
Each channel of PCF9846 is connected to an EEPROM. Therefore, the board contains
four I2C memory ICs. Each EEPROM has its own voltage regulator (except U13, which is
supplied with 3.3 V directly from the Arduino port). This configuration allows testing of the
DUT behavior when working with I2C busses at different logic levels. Table 4 shows the
EEPROM ICs connected to I2C switch, along with their corresponding LDOs.
Channel (SDx, SCx) EEPROM RefDes LDO RefDes Voltage Circuit presented in:
Channel #1 (SD0, SC0) U10 U15 1.8 V Figure 6
Channel #2 (SD1, SC1) U12 U16 2.5 V Figure 7
Channel #3 (SD2, SC2) U13 - 3.3 V Figure 8
Channel #4 (SD3, SC3) U14 U17 3.6 V Figure 9
Table 5. VCCA programmable voltages
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Figure 6. The PCA9846PW-ARD – EEPROM (1.8 V) section
Figure 7. The PCA9846PW-ARD – EEPROM (2.5 V) section
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Figure 8. The PCA9846PW-ARD – EEPROM (3.3 V) section
Figure 9. The PCA9846PW-ARD – EEPROM (3.6 V) section
4.5 Schematic, board layout and bill of materials
The schematic, board layout and bill of materials for the PCA9846PW-ARD evaluation
board are available at http://www.nxp.com/PCA9846PW-ARD.
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5 Installing and configuring software tools
PCA9846PW-ARD evaluation board is designed and built as an expansion board able to
work in conjunction with a motherboard equipped with an Arduino port. The board was
built to be fully compatible with the following NXP evaluation boards:
•IMXRT1050 EVK
•LPCXpresso55S69 Development Board
•i.MX 8M Mini LPDDR4 EVK
Each evaluation or development board mentioned above benefits from firmware support,
which can be downloaded from www.nxp.com/. Before starting, the EVK motherboard
must be programmed with the corresponding firmware package. Additionally, a GUI
application (Windows 10) is available for download from the NXP site, allowing rapid
testing and operation of PCA9846PW-ARD expansion board through one of above
mentioned EVBs. The GUI application is common for all three evaluation boards. The
GUI software is also built to control two expansion boards: the PCA9617ADP-ARD
and the PCA9846PW-ARD. Both are manufactured by NXP Semiconductors. For
details regarding installation of the EVB firmware and GUI host software on PC, refer to
UM11581[12]. Once the software is installed, select the correct combination of EVK and
PCA9846PW-ARD expansion card. The board can be controlled from the GUI interface.
See Section 6 and Section 7 for more details regarding the operation of PCA9846PW-
ARD from GUI software.
6 Configuring the hardware
6.1 Using the PCA9846PW-ARD with an IMXRT1050 EVK board
Figure 10 shows the required hardware for operation of the PCA9846PW-ARD expansion
board with IMXRT1050 EVK. The following items are necessary:
•One IMXRT1050-EVK board
•One PCA9846PW-ARD expansion board
•One USB-A/USB Micro-B cable
•A PC with Windows 10 operating system
The IMXRT1050 EVK motherboard can be powered by one of the three methods:
•Connecting an external 5 V DC power supply to the barrel power connector (J2) on the
board
•Connecting an USB cable from the PC to the Micro-B USB connector (J9) on the board
•Connecting an USB cable from the PC to the USB connector (J28) on the board. When
the PC is connected in this fashion, the USB port can simultaneously act as a debug
interface. Therefore, by using a single USB cable connected to J28, the EVK can be
powered and at the same time linked to the PC for data exchange.
The older USB ports (from PC) are not able to deliver the necessary current (500 mA),
before establishing the communication, use an external power supply (connected to J2).
From J1 on the EVK board, see Figure 10, the user can select the power configuration
for the motherboard. Refer to IMXRT1050 EVKB Board Hardware User's Guide[2].
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Figure 10. PCA9846PW-ARD expansion board and IMXRT1050 EVK, before starting
To configure the hardware and workstation, complete the following procedure:
1. Configure the suitable power configuration of EVK (J1). If using J28 for power supply,
place the J1 jumper in position 5-6. If using an external power supply (connected to
J2), place the jumper J1 in position 1-2.
2. Insert the PCA9846PW-ARD expansion card on the Arduino connector of the EVK.
See Figure 10.
3. Using USB connector J28, connect the EVK board to an USB port of the computer.
4. Install the IMXRT1050 target firmware. Refer to UM11581[12], for step-by-step
instructions.
5. Install GUI application. Refer to UM11581[12].
6. Open the GUI application to operate the device from the PC. See Section 7.
Figure 11 shows the boards during the operation.
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Figure 11. Assembly PCA9846PW-ARD expansion board and IMXRT1050 EVB operation
6.2 Using the PCA9846PW-ARD with an LPCXpresso55S69 development
board
Figure 12 shows the required hardware for operation of the PCA9846PW-ARD and
LPCXpresso55S69 EVK board. This configuration consists of:
•One LPCXpresso55S69 EVK board
•One PCA9846PW-ARD expansion board
•One USB-A / USB Micro-B cable
•A PC with Windows 10 operating system
The LPCXpresso55S69 development board is equipped with four USB Micro-B
connectors: P5, P6, P9, and P10. The board can be powered through any USB port.
Using P6 USB connector to connect the board to the PC simplifies the start-up operation
because P6 is designated for debugging and the USB cable accomplishes two tasks at
the same time: powering the board and serving as a data link between the EVK board
and PC. For more details regarding power-up and operation of the LPCXpresso55S69
development board. Refer to UM11158[4].
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Figure 12. PCA9846PW-ARD expansion board and LPCXpresso55S69 motherboard, before
starting
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The following steps describe how to assemble, program, and operate the configuration
shown in Figure 11.
1. Insert the PCA9846PW-ARD expansion board. to P16-P19 connectors located on
LPCXpresso55S69 development board. See the marked pins of P16-P19 in Figure
12.
2. Connect the development board using port P6 USB port of PC.
3. Install the LPCXpresso55S69 target firmware. Refer to UM11581[12] for more
information.
4. Install GUI application on the PC. See the instruction file called out in Step 3.
5. Open the GUI application to operate the device from the PC. See Section 7.
Figure 13 shows the two boards in operation.
Figure 13. PCA9846PW-ARD expansion board and LPCXpresso55S69 mother board
operation
6.3 Using the PCA9846PW-ARD with an i.MX 8M Mini LPDDR4 EVK board
When an i.MX 8M Mini LPDDR4 EVK board is used with the PCA9846PW-ARD board, a
third board (IMX8MMINI-IARD interposer board) must be used, especially designed and
built as EVK-expansion board interconnection. The EVK board i.MX 8M Mini LPDDR4
is not equipped with an Arduino port. Instead, it has a 2 x 20 pin expansion connector
(J1003, refer to UM11612[10]). J1003 is a multipurpose port, containing various digital I/
O lines, including specialized I2C and SPI buses. Starting from the expansion connector
pin chart, an Arduino port interposer board was developed, with the role of signal-to-
signal bridge between the 2 x 20 connector pins on the i.MX 8M Mini LPDDR4 EVK and
the mated connectors of the Arduino port present on the PCA9846PW-ARD expansion
board.
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To operate the setup, along with the EVK and the expansion board, a third board must be
included in the setup assembly. Figure 13 shows the necessary boards and how these
boards are connected. The configuration consists of:
•One i.MX 8M Mini LPDDR4 EVK board
•One PCA9846PW-ARD expansion board
•One IMX8MMINI-IARD interposer board
•One USB-A/USB-C cable
•One USB-A/USB Micro-B cable
•A PC with Windows 10 operating system
It is recommended to attach the PCA9846PW-ARD to the Arduino connectors of the
IMX8MMINI-IARD interposer board first, and the resulting assembly to the i.MX 8M Mini
LPDDR4 EVK. This can be done by plugging J1 connector located on the interposer
board to J1003 connector on the EVK.
To power up the EVK, a USB-C-type cable connected to PORT 2 of the EVK is used. The
power switch SW101 on the EVK board must be set to ON to power up the setup. Data
communication is achieved by routing a separate USB (Micro-B type) cable from an USB
port on the PC to debug port (J901) on the EVK. See Figure 13 and Figure 14.
Refer to UM11612[10] for details regarding power up and operation of the setup assembly.
Figure 14. The assembly PCA9846PW-ARD expansion board, IMX8MMINI-IARD interposer
board, and i.MX 8M Mini LPDDR4 EVK, before starting
To configure and operate the setup, follow the below steps:
1. Insert the PCA9846PW-ARD onto the IMX8MMINI-IARD interposer board Arduino
connectors (located on the top side).
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2. Attach IMXMMINI-IARD connector plug J1 (located on the bottom of the board) into
J1003 expansion board located on the top side of i.MX 8M Mini LPDDR4 EVK. See
Figure 13.
3. Power up the EVK board using an USB Type C cable attached to PORT 2.
4. Connect the EVK to the PC, using an USB Micro-B cable, attached to J901 debug
port.
5. Place SW101 in ON position to power up the boards.
6. Install the MIMXRT1050 target firmware. Refer to UM11581[12].
7. Install GUI application on the PC. Refer to UM11581[12] file referred in the above
step.
8. Open the GUI application to operate the device from the PC. For details regarding
GUI operation, see Section 7.
Figure 15. PCA9846PW-ARD expansion board and i.MX 8M Mini LPDDR4 EVK board
operation
6.4 Using PCA9846PW-ARD with another device
The PCA9846PW-ARD expansion board can be operated with other EVK board, which
has an Arduino port. There are two options to connect the board. Use another EVK
equipped with an Arduino port, or an EVK without Arduino port. In the first case, use
a firmware developed with PCA9846A specifications and attach PCA9846PW-ARD
expansion board to the EVK to operate the board. In the second case, using the pin
chart of Arduino connectors, see Table 1, make the necessary electrical connections
(for power, I2C-bus and control lines), and develop the desired firmware, assuring that
is compliant with IC specifications. Refer to PCA9846A[13] to read details about internal
registers of the DUT IC and data exchange between internal controller and the EVK.
Check for correct electrical connections and avoid data conflicts on the signal lines, to
prevent IC damage.
UM11759 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2022. All rights reserved.
User manual Rev. 1 — 6 June 2022
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