NXP Semiconductors PCF85263ATL-ARD User manual

UM11714
PCF85263ATL-ARD evaluation board
Rev. 1.0 — 17 February 2022 User manual
Document information
Information Content
Keywords PCF85263ATL, I2C-bus, RTC, Arduino port, EVK
Abstract The PCF85263ATL-ARD evaluation board is a daughterboard equipped with
Arduino port, designated for easy test and design of PCF85263A IC, tiny real-
time clock/calendar with alarm function, battery switch-over and timestamp
input, controlled through Fm I2C 2-wire bus. The board is fully compliant
with IMXRT1050 EVK, LPCXpresso55S69 and i.MX 8M Mini LPDDR4 EVK,
including GUI software control. The board can be attached to any device
equipped with Arduino port.

NXP Semiconductors UM11714
PCF85263ATL-ARD evaluation board
Rev Date Description
v1.0 20220217 Initial version
Revision history
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PCF85263ATL-ARD evaluation board
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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NXP Semiconductors UM11714
PCF85263ATL-ARD evaluation board
1 Introduction
This document describes the PCF85263ATL-ARD evaluation board. The evaluation
board is built around the PCF85263A IC and works as a daughterboard which can be
connected through an Arduino port to various Arduino compatible (including original
Arduino Uno R3) boards. The board is intended to test and measure the characteristics
of the PCF85263A low power, tiny real-time clock/calendar with alarm and timestamp
input, produced by NXP Semiconductors.
The RTC communicates with the controller / microprocessor through a bidirectional Fm
(400 kHz) I2C-bus. Among the device under test (DUT) IC, the board is equipped with
an Arduino port and the necessary components for easy testing, shortening the time to
make measurements and check operation of the PCF85263A IC.
Additionally, the daughterboard has software support and a graphical user interface
(Windows platform) for 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 evaluation board and its supported
device(s) on http://www.nxp.com.
The information page for PCF85263ATL-ARD evaluation board is at http://www.nxp.com/
PCF85263ATL-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 PCF85263ATL-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 PCF85263ATL-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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NXP Semiconductors UM11714
PCF85263ATL-ARD evaluation board
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 PCF85263ATL-ARD features
•Connector for external access to I2C-bus
•On-board LED for interrupt pin monitoring
•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 dev. 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 is necessary to use IMX8MMINI-IARD
interposer board between the EVK and PCF85263ATL-ARD daughterboard (see
IMX8MMINI-IARD User Manual).
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 port connectors (J5, J6, J35, J36) are located on the bottom
side of the board.
The board was developed around the DUT IC, PCF85263A (U1, see Figure 1.
). Using the Arduino interface, the board ca be attached to any device equipped with
Arduino port. The PCF85263ATL-ARD daughterboard communicates with the host
device or EVK, through an I2C-bus, with a maximum speed of 400 kHz. The I2C-bus is
linked to the dedicated pins of the Arduino connector (J35) and to on-board connector
(J38), allowing the user to access the I2C-bus from external. For more details about I2C
description and bus transactions, see PCF85263A datasheet (NXP Semiconductors).
The INTA/CLK output (pin 9) of PC85263A IC is connected to J5, pin 3. The on-
board LED (D2) can be connected through jumper header J24 to the interrupt line
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NXP Semiconductors UM11714
PCF85263ATL-ARD evaluation board
for monitoring purposes. The pin 4 of the DUT (TS/CLK/INTB) can be configured as
timestamp input, clock output or interrupt output pin. When is set as timestamp input,
an on-board switch (SW1) can be used for timestamp event generation. The TS/CLK/
INTB multipurpose pin is linked to J5, pin 4. The CLK output (pin 8) is linked to J36,
pin 1 through zero-ohm resistor R35. For more details see, the schematic diagram of
PCF85263ATL-ARD board (SPF-46659_A1.pdf).
The board is powered through the Arduino connector J6 (pin 4 – 3.3V, pin 6, 7 – GND).
The power is delivered to the DUT through J37 (located on the PCF85263ATL-ARD
board). The role of J37 is to allow the user to perform power-off tests and current
measurements. The board contains coin cell battery (BT1) for power backup and battery
switch-over test. The power from battery cell is delivered through J39. D1 is the power
indicator LED. The PCF85263A IC is driven by the 32.768 kHz crystal oscillator (Y1).
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NXP Semiconductors UM11714
PCF85263ATL-ARD evaluation board
Figure 1. The PCF85263ATL-ARD board picture, top view (up) and bottom view (down)
4.3 Schematic diagram
The schematic diagram of PCF85263ATL-ARD is available at URL: http://www.nxp.com/
PCF85263ATL-ARD.
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NXP Semiconductors UM11714
PCF85263ATL-ARD evaluation board
4.4 Arduino port
J5, J6, J35, and J36 are the mated pin headers of Arduino Uno R3 connectors, having
the same electrical function and placed on the board, so that the daughterboard can
be directly inserted in the Arduino port. The daughterboard uses only four signal lines.
Table 1 represents the pin chart of connectors, and the lines used in the circuit (see also
the SPF-46659_A1.pdf schematic file):
Ref Des # Arduino label PCF85263ATL-ARD function
1 NC Not used
2 IOREF Not used
3 RESET Not used
4 3.3V Not used
5 5V Power supply
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
J35 (analog, digital, I2C)
6 A5 / SCL I2C – SCL
1 D0 / RX Not used
2 D1 / TX Not used
3 D2 RTC_INTA_B
4 D3 / PWM RTC_INTB_B
5 D4 Not used
6 D5 / PWM Not used
7 D6 / PWM Not used
J5 (digital, UART, PWM)
8 D7 Not used
1 D8 RTC_CLKOUT
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
J36 (mixed)
9 A4 / SDA Not used
Table 1. Pin chart of Arduino connectors and their usage
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NXP Semiconductors UM11714
PCF85263ATL-ARD evaluation board
Ref Des # Arduino label PCF85263ATL-ARD function
10 A5 / SCL Not used
Table 1. Pin chart of Arduino connectors and their usage...continued
The circuit is supplied with 3.3 V from Arduino port through J6 and J36. Pin no. 4 of J6
is 3.3 V power supply, while pin no. 6, 7 of J6, and pin no. 7 of J36 represents the power
supply return (ground).
4.5 I2C external connector (J38)
The I2C-bus of the PCF85263A can be directly accessed from external through the
connector J38, located on the PCF85263ATL-ARD daughterboard. Table 2 describes the
pin chart of J38.
J38 pin no. Function Comment
1 VCC_3V3 Power supply (3.3 V)
2 I2C_3V3_SDA I2C-bus data (SDA)
3 I2C_3V3_SCL I2C-bus clock (SCL)
4 GND Power supply return (ground)
Table 2. J38 pin chart
4.6 Jumpers and test points
The board contains two jumpers and several test points. Table 3 and Figure 2 detail
the jumper locations and their default configurations. Table 4 describes the test points
located on the PCF85263ATL-ARD board.
Ref Des Label Default Description
ON: Enable the interrupt monitor LED (D2)
J24 INT MONITOR ON / OFF ON OFF: Disable the interrupt monitor LED (D2)
ON: PCF85263A (U1) VDD power-on
J37 RTC VDD ON / OFF ON OFF: PCF85263A (U1) VDD power-off
ON: PCF85263A (U1) VBAT power-on
J39 RTC VBAT ON/OFF ON OFF: PCF85263A (U1) VBAT power-off
Table 3. PCF85263ATL-ARD jumpers
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PCF85263ATL-ARD evaluation board
Figure 2. PCF85263ATL-ARD Jumper locations
Ref Des Test point / jumper label Description
TP1 CLKOUT CLK (pin 8) of PCF85263A
TP2 INTA INTA/CLK (pin 9) of PCF85263A
TP3 SDA SDA (pin 6) of PCF85263A
TP4 SCL SCL (pin 7) of PCF85263A
TP5 VCC_3V3 3.3 V power rail (Arduino connector)
TP6 VCC_5V0 5 V power rail (Arduino connector)
TP7 VBAT The coin cell battery (BT1) voltage
TP8 VCC_3V3_RTC 3.3 V – RTC power rail
TP9 GND Ground
TP10 GND Ground
TP11 TS-INTB TS/CLK/INTB (pin 4) of PCF85263A
TP12 VCC_3V3_MAIN 3.3 V main power rail
TP13 VBAT_RTC VBAT power rail
Table 4. PCF85263ATL-ARD test points
5 Installing and configuring software tools
PCF85263ATL-ARD evaluation board is designed and built as a daughterboard 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 (EVK) boards:
•IMXRT1050 EVK Board;
•LPCXpresso55S69 Development Board;
•i.MX 8M Mini LPDDR4 EVK Board;
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