NXP Semiconductors

UM11597

PCF2131-ARD evaluation board

Signal

Active

J4.1 – I2C_SCL

J4.3 – I2C_SDA

J4.7 – INTB

J4.9 – INTA

J12.1 – INTA

J12.2 – INTB

J12.9 – I2C_SDA

J12.10 – I2C_SCL

J4.1 – INTB

J4.3 – INTA

J4.5 – SPI_MISO

J4.7 – SPI_SCK

J4.8 – SPI_MOSI

J4.9 – SPI_CE

J12.1 – INTA

J12.2 – INTB

J12.3 – SPI_CE

J12.4 – SPI_MOSI

J12.5 – SPI_MISO

J12.6 – SPI_SCK

Table 2. I2C/SPI bus selection...continued

4.6 Aardvark header

Wire label

J5

Wire label

I2C_SCL

1

2

GND

I2C_SDA

3

4

NC

SPI_MISO

5

6

NC

SPI_SCK

7

8

SPI_MOSI

SPI_CE

9

10

GND

Table 3.  J4 (Aardvark header) pin chart

The PCF2131-ARD daughtercard contains a dedicated header (J4) for direct connection

with an Aardvark I2C/SPI Host Adapter. Table 3 depicts the pin chart of the Aardvark

header. For more details, see the Aardvark I2C / SPI Host Adapter from Total Phase

(www.totalphase.com).

When an external interface cable (Aardvark or Promira) is used on J4, depending on the

interface selected, user should also place jumpers across all pins on either J1 (I2C) or J2

(SPI). The user must be sure the board is properly powered, and the Arduino interface

is not used, to avoid signal conflicts. INTA and INTB signals are routed to the other

interface pins that should be repurposed as GPIO functions.

However, when using the Arduino connector, there are two dedicated pins already

assigned for INTA (J12.1) and INTB (J12.2). It is not necessary to close the jumpers

across 11&12 and 13&14 on J1 or J2 to route interrupt signals to the other interface pins.

4.7 Timestamp connector and toggle switches

Figure 3 depicts the timestamp section of the PCF2131-ARD schematic diagram. The

four dedicated inputs for timestamp (TS) of the DUT are pins 8 to 11. On the TS inputs,

toggle switches SW1 to SW4 are connected. Simultaneously, the inputs are linked to J10

connector, so that the user can use either on-board switches or external devices for the

timestamp test.

UM11597

All information provided in this document is subject to legal disclaimers.

© NXP B.V. 2021. All rights reserved.

User manual

Rev. 1.0 — 15 September 2021

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