NXP Semiconductors PCF2131-ARD, User Manual, Page: 9 / 31

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. I
2
C/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 I
2
C/SPI Host Adapter. Table 3 depicts the pin chart of the Aardvark
header. For more details, see the Aardvark I
2
C / 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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