NXP Semiconductors PCF85053ATK-ARD User manual

UM11873
PCF85053ATK-ARD evaluation board
Rev. 1.0 — 17 March 2023 User manual
Document information
Information Content
Keywords PCF85053ATK, I2C-bus, RTC, CPU, SRAM, Arduino header, EVK
Abstract The PCF85053ATK-ARD evaluation board is an expansion board equipped with Arduino headers,
designated for easy test and design of PCF85053ATK IC, real-time clock/calendar with alarm
function, battery switchover and timestamp functionality, controlled through two Fast-mode
I2C-buses. The board is fully compatible with MIMXRT1050-EVKB, LPCXpresso55S69 and
MIMXRT685-EVK, including GUI software control. The board can be attached to any device
equipped with Arduino headers.

NXP Semiconductors UM11873
PCF85053ATK-ARD evaluation board
Rev Date Description
v.1.0 20230317 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 PCF85053ATK-ARD demo board. The evaluation board is built around the
PCF85053ATK IC and works as an expansion board which can be connected through an Arduino header to
various Arduino compatible (including original Arduino Uno R3) boards. The board is intended to test and
measure the characteristics of the PCF85053ATK bootable CPU RTC with two I2C-buses, 128 byte SRAM, and
alarm function, produced by NXP Semiconductors.
The RTC communicates with the controller / microprocessor through two independent Fm (400 kHz) I2C-
buses. Among the device under test (DUT) IC, the board is equipped with an Arduino header and the
necessary components for easy testing, shortening the time to make measurements and check operation of the
PCF85053ATK IC.
Additionally, the expansion board has software support and a graphical user interface (Windows platform) for
the following NXP evaluation boards: MIMXRT1050-EVK Board, LPCXpresso55S69 Development Board and
MIMXRT685-EVK Board.
2 Finding kit resources and information on the NXP web site
NXP Semiconductors provides online resources for evaluation board and its supported device(s) on http://
www.nxp.com.
The information page for PCF85053ATK-ARD evaluation board is at http://http://www.nxp.com/PCF85053ATK-
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 PCF85053ATK-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 PCF85053ATK-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
3.2 Assumptions
Familiarity with the I2C bus is helpful but not required.
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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 below 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, MIMXRT685-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 PCF85053ATK-ARD features
•Equipped with Arduino Uno R3 compatible headers for direct connection to Arduino compatible MCU EVKs
•On-board connector for external access and monitoring for I2C-bus / Alert / CLKOUT
•1.8 V / 3.3 V selectable power supply
•On-board backup battery cell
•Fully with MIMXRT1050-EVK board, including GUI (Windows 10)
•Fully compatible with LPCXpresso55S69 dev. board, including GUI (Windows 10)
•Fully compatible with MIMXRT685-EVK board, including GUI (Windows 10)
4.2 Kit featured components
Figure 1 identifies the main components on the board. The main elements are called out in the picture. The
Arduino headers (J1, J2, J3, J4) are accessible from both sides. On the top side there are pin receptacles, while
on the bottom side are pin headers on the bottom side of the board.
The board was developed around the DUT IC, PCF85053ATK (U3, see Figure 1). Using the Arduino interface,
the board can be attached to any board equipped with Arduino header. The PCF85053ATK-ARD expansion
board communicates with the host device or EVK, through two I2C-buses, with a maximum speed of 400 kHz.
For more details, see Section 4.5.
Alongside the two I2C-buses, PCF85053A RTC has some additional pins with various functions. The pin ALRT#
is an open-drain active-low interrupt output, therefore the ALRT# output has a 10 kΩ pull-up resistor (R8). The
pin CLKOUT is also an output, at this pin the clock signal can be monitored. The pin RTC_CLR# is an input pin
which clears the internal SRAM of the RTC and resets certain registers. The reset can be initiated locally (J9),
or remote through the signal switch U4 and the Arduino header. The oscillator Y1 is connected to pins OSCI
and OSCO pins.
The power supply voltage of PCF85053A can be either 1.8 V or 3.3 V, using the jumper selector J5. The 3.3V
voltage rail is supplied from the EVK (the motherboard) through the Arduino header, and 1.8 V is generated
by the LDO voltage regulator U1. D1 is the power indicator. The PCF85053ATK-ARD board contains the
backup battery (BT1), connected to VBAT power pin of the DUT through J6, which allows to supply the VBAT
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pin from the backup battery or from VCC. J7 and J8 allows for VBAT and VCC line interruption and current
measurements.
The level shifter U2 assures the voltage translation of the I2C-buses, ALRT, and CLKOUT signals. For more
details see, the schematic diagram of PCF85053ATK-ARD board (SPF-53085_B1.pdf).
Figure 1. PCF85053ATK-ARD evaluation board, top view (up)
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Figure 2. PCF85053ATK-ARD evaluation board,bottom view (down)
4.3 Schematic diagram
The schematic diagram of PCF85053ATK-ARD is available at URL: http://www.nxp.com/PCF85053ATK-ARD.
4.4 Arduino headers
J1, J2, J3, and J4 are the mated pin headers of Arduino Uno R3 connectors, having the same electrical function
and placed on the board, so that the expansion board can be directly inserted into the Arduino headers. The
expansion board uses eight signal lines. See Table 1 for the pin chart of connectors, and the lines used in the
circuit (refer to SPF-53085_B1.pdf schematic file).
Ref Des # Arduino label PCF85053ATK-ARD function
1 NC Not used
2 IOREF VIO_REF_ARD
J1 (Power)
3 RESET Not used
Table 1. The pin chart of Arduino connectors and their usage
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Ref Des # Arduino label PCF85053ATK-ARD function
4 3.3V Power supply
5 5V Not used
6 GND Power supply return
7 GND Power supply return
8 Vin Not used
1 A0 Not used
2 A1 Not used
3 A2 Not used
4 A3 Not used
5 A4 / SDA ARD_SDA_1
J2 (analog, digital, I2C)
6 A5 / SCL ARD_SCL_1
1 D0 / RX ARD_SCL_2B
2 D1 / TX ARD_SDA_2B
3 D2 ARD_ALRT
4 D3 / PWM Not used
5 D4 Not used
6 D5 / PWM Not used
7 D6 / PWM Not used
J4 (digital, UART, PWM)
8 D7 Not used
1 D8 ARD_CLR
2 D9 / PWM ARD_CLKOUT
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 ARD_SDA_2A
J3 (mixed)
10 A5 / SCL ARD_SCL_2A
Table 1. The pin chart of Arduino connectors and their usage...continued
The circuit is supplied with 3.3 V from Arduino headers J1 and J3. Pin no. 4 of J1 is 3.3 V power supply, while
pin no. 6, 7 of J1, and pin no. 7 of J3 represents the power supply return (ground).
4.5 I2C-buses
The PCF85053A includes two I2C-bus interfaces. The first I2C-bus (SDA1, SCL1) is linked to Arduino connector
J2, pin 5 and pin 6. The second I2C-bus (SDA2, SCL2) can be connected either to J3 (pin 9, 10) or to J4 (pin 1,
2). J12 is the bus selector. See the SPF-53085_B1.pdf schematic file.
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4.6 Jumpers and test points
The board contains several jumpers and test points. Table 2 and Figure 3 details the jumper locations and their
default configurations. Table 3 describes the test points located on the PCF85053ATK-ARD board.
Ref Des Label Default Description
1-2: VCC_RTC from VCC_1V8
J5 VCC_RTC Select 1-2 2-3: VCC_RTC from VCC_3V3
1-2: VBAT_RTC from battery cell (BT1)
J6 VBAT_RTC Select 1-2 2-3: VBAT_RTC from VCC_RTC
ON: PCF85053ATK (U3) VBAT power-on
J7 VBAT_RTC ON OFF: PCF85053ATK (U3) VBAT power-off
ON: PCF85053ATK (U3) VDD power-on
J8 VCC_RTC ON OFF: PCF85053ATK (U3) VDD power-off
ON: Clear Local – on
J9 CLEAR - LOCAL OFF OFF: Clear Local – off
ON: Clear Remote – on
J10 CLEAR - REMOTE ON OFF: Clear Remote – off
1-3/2-4: I2C from J3
J12 I2C_2 Select 1-3
2-4 3-5/4-6: I2C from J4
1-2: VIO_REF from VIO_REF_ARD
J13 VIO_REF Select 1-2 2-3: VIO_REF from VCC_3V3
Table 2. PCF85053ATK-ARD jumpers
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Figure 3. PCF85053ATK-ARD jumper locations
Ref Des Test point / jumper label Description
TP1 VCC_3V3_ARD 3.3 V power rail (Arduino connector)
TP2 VCC_3V3 3.3 V power rail
TP3 VCC_1V8 1.8 V power rail
TP4 GND Ground
TP5 GND Ground
Table 3. PCF85053ATK-ARD test points
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Alongside the test points located on the board, the pin header J12 allows easy access to the signal / data lines
of the PCF85053A RTC. Table 4 depicts the pin chart of J12.
J12 pin no. Function Comment
1 RTC_SDA_1
2 RTC_SCL_1 Primary I2C interface
3 RTC_SDA_2
4 RTC_SCL_2 Secondary I2C interface
5 RTC_ALRT RTC_ALRT# output
6 RTC_CLKOUT RTC_CLKOUT output
7 RTC_CLR RTC_CLR# input
8 GND Ground
Table 4. The J12 pin chart
5 Installing and configuring software tools
PCF85053ATK-ARD evaluation board is designed and built as an expansion board able to work in conjunction
with a motherboard equipped with an Arduino header. The board was built to be fully compatible with the
following NXP Evaluation (EVK) boards:
•MIMXRT1050-EVK Board
•LPCXpresso55S69 Development Board
•i.MX 8M Mini LPDDR4 EVK Board
Each above mentioned evaluation / development board has firmware support which can be downloaded from
NXP company site (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 PCF85053ATK-ARD expansion board through the one of
above mentioned EVK. The GUI application is common for all three EVKs. For details regarding installation of
the EVK firmware and GUI host software on PC please download UM11581 - Arduino Shields GUI and firmware
installation available at https://www.nxp.com/docs/en/userguide/UM11581.pdf.
Once the software is installed, the first step is to select the correct combination EVK – PCF85053ATK-ARD
expansion board, and then the board can be controlled from the GUI interface. See Section 6 and Section 7 for
more details regarding the operation of PCF85053ATK-ARD from GUI software.
6 Configuring the hardware
6.1 Using the PCF85053ATK-ARD with an MIMXRT1050-EVK board
Figure 4 shows the required hardware for operation of the PCF85053ATK-ARD expansion board with
MIMXRT1050-EVK. The following items are necessary:
•One MIMXRT1050-EVK board
•One PCF85053ATK-ARD expansion board
•One USB-A / USB Micro-B cable
•A PC with Windows 10 operating system
The MIMXRT1050-EVK motherboard can be powered by one of the three methods:
•Connecting an external 5VDC power supply to the barrel power connector (J2) on the board
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•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 through the USB connectors J9 and J38, 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 (500mA), before establishing the
communication, use an external power supply (connected to J2).
From J1 on the EVK board (see Figure 4) the user can select the power configuration for the motherboard. For
further details, refer to the MIMXRT1050 EVKB Board Hardware User’s Guide[2].
Figure 4. PCF85053ATK-ARD expansion board and MIMXRT1050-EVK board, 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, the J1 jumper shall be
placed in position 5-6. If using an external power supply (connected to J2), the jumper J1 will be placed in
position 1-2.
2. Place jumpers on J12 in 1-2/3-4 position (default).
3. Insert the PCF85053ATK-ARD expansion board on the Arduino connector of the EVK (see Figure 4 and
Figure 5).
4. Using USB connector J9, connect the EVK board to an USB port of the computer.
5. Install the MIMXRT1050 target firmware (download from NXP site and see UM11581, Arduino Arduino
shields GUI and firmware installation manual for step-by-step instructions).
6. Install GUI application (see UM11581, Arduino shields GUI and firmware installation manual).
7. Open the GUI application to operate the device from the PC. For details regarding GUI operation see
Section 7.
Figure 5 shows the boards during the operation.
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Figure 5. The assembly PCF85053ATK-ARD expansion board / MIMXRT1050-EVK board operation
6.2 Using the PCF85053ATK-ARD with an LPCXpresso55S69 development board
Figure 6 shows the required hardware for operation of the PCF85053ATK-ARD and LPCXpresso55S69 EVK
board. This configuration consists of:
•One LPCXpresso55S69 EVK board
•One PCF85053ATK-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 thus
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, see the LPCXpresso55S69/LPCXpresso55S28 Development Board User Manual here.
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Figure 6. PCF85053ATK-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 6.
1. Insert the PCF85053ATK-ARD expansion board to P16 – P19 connectors located on LPCXpresso55S69
development board (see the marked pins of P16 – P19,Figure 6)
2. Place jumpers on J12 in 1-2/3-4 position (default)
3. Connect the development board using port P6 USB port of PC
4. Install the LPCXpresso55S69 target firmware (download from NXP site and read the EVK_Firmware_And_
GUI_Install_Guide_For_Arduino_Boards.pdf instruction file)
5. Install GUI application on PC (see the instruction file called out in the previous step)
6. Open the GUI application to operate the device from the PC. For details regarding GUI operation see
Section 7
Figure 7 shows the two boards in operation.
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Figure 7. PCF85053ATK-ARD expansion board / LPCXpresso55S69 motherboard operation
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6.3 Using the PCF85053ATK-ARD with an MIMXRT685-EVK board
The third EVK board which can be used with the PCF85053ATK-ARD board, is MIMXRT685-EVK. Figure 8
shows the two boards, before assembly and operation. The following items are necessary to test and operate
the board assembly:
•One MIMXRT685-EVK board
•One PCF85053ATK-ARD expansion board
•One USB-A / USB Micro-B cable
•Two jumper wires
•A PC with Windows 10 operating system
There are three ways to power-up the MIMXRT685-EVK board: through Link USB (J5), External Power USB
(J6), and Target USB (J7). The Barrel connector J24 is designed to supply the digital amplifier section, therefore
cannot be used to supply the MIMXRT685-EVK board. The datalink between the PC workstation and the EVK
is realized through the Target USB (J7). Using the connector J7 and a USB-cable, the assembly MIMXRT685-
EVK / PCF85053ATK-ARD can be simultaneously powered and connected to the PC, to be operated from the
GUI application.
The user may find details regarding power-up and operation of the setup assembly in MIMXRT685-EVK UM
11159 user manual. The pdf file can be downloaded from www.nxp.com/.
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Figure 8. The assembly PCF85053ATK-ARD expansion board and MIMXRT685-EVK, before starting
To configure and operate the setup, follow the below steps:
1. Insert the PCF85053ATK-ARD onto the MIMXRT685-EVK board
2. Configure J12 jumper header as follows: connect pin 3 to pin 6, and pin 4 to pin 5 using the two jumper
wires (see Figure 9)
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 J7 Target USB connector
5. Install the MIMXRT1050 target firmware (download UM11581, Arduino shields GUI and firmware installation
manual from NXP site)
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6. Install GUI application on the PC (see the instruction file referred in the above step)
7. Open the GUI application to operate the device from the PC. For details regarding GUI operation see
Section 7
Figure 9. PC85053ATK-ARD expansion board / MIMXRT685-EVK board operation
6.4 Using PCF85053ATK-ARD with another device
The PCF85053ATK-ARD expansion board can be operated with any other EVK boards which has an Arduino
header. There are two options to connect the board: using other EVK equipped with an Arduino header, and
an EVK without Arduino header. In the first case, a firmware shall be developed according to PCF85053A
specifications, and then simply attach PCF85053ATK-ARD expansion board to the EVK to operate the board. In
the second case, using the pin chart of Arduino connectors (Table 1), make the necessary electrical connections
(for power, I2C-bus and control lines), and develop the desired firmware, assuring that it is compliant with
the IC specifications. Use PCF85053A data sheet to read details about internal registers of the DUT IC and
data exchange between internal controller and the EVK. Assure correct electrical connections and avoid data
conflicts on the signal lines to prevent IC damage.
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7 GUI description
A GUI application is available for the three EVK boards from NXP Semiconductors. The application is common
for all above mentioned EVKs (MIMXRT1050-EVKB, LPCXpresso55S69 and MIMXRT685-EVK), produced by
NXP Semiconductors.
This section describes the GUI application and how the user can control the PCF85053ATK-ARD expansion
board from the graphical interface. First, install the GUI package and software on the PC (Windows 10). For
more details, see UM11581.
Once installation is complete, assure that one of the mentioned three EVK with attached PCF85053ATK-ARD
expansion board is connected to the PC and powered-on. Open the PCF85053-ARD GUI application. An
interface appears as shown in Figure 10.
The GUI application starts with Settings tab (marked with red arrow). The left-hand side (the yellow area) of the
window provides the following settings:
• COM PORT: displays the port selected for communication. The port is automatically selected by the system
(COM4 in the screen shot).
• I2C speed: display / select the I2C-bus speed. The available values is 100 kHz, and 400 kHz.
Connect (Disconnect): displays / selects the current status of the communication between the GUI and the
PCF85053ATK-ARD expansion board. Assuming the correct parameters are chosen, clicking the Connect
button establishes the connection with the EVK. In the bottom side of the GUI window a status bar shows in real
time the status regarding connection between PC and the EVK.
• Init Board: initialize the DUT (sets the internal registers of PCF85053ATK to their default state).
On the right-hand side of the window, the Device Setting section is located. From this section, the following
settings are available:
• DM (Data Mode): sets the time format (binary / BCD) of the RTC. Use the drop-down box to select the
desired format. Under the drop-down box the register address of the RTC is specified (see the PCF85053ATK
data sheet).
• HF (Hour Format): sets the hour format (0-24 hours / 0-12 hours).
• DSM (Daylight Saving Mode): 0-disable / 1-enable.
Under each control box of the Device Settings parameters, the address of the internal register and the
corresponding bit is indicated. This feature helps to easily identify which register of PCF85053A is addressed.
For more details regarding DM, HF, and DSM settings, see the PCF85053ATK data sheet, section 7.4.1
(Control register).
The Read button brings back in the GUI the current settings of the DUT register.
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