UM11081
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2017. All rights reserved.
User Manual
Rev. 1.01 — 6 December 2017
9 of 13
NXP Semiconductors
LPCXpresso802
User Manual
Note that the default ports for ISP UART boot are connected to CN3.
5.2 Grove connector
The LPCXpresso802 board includes a header for connection of Seeed Studio Grove I
2
C
sensors. This header supplies the I2C connections plus 3.3V and ground.
6. Power
measurement
JP1 is provided to enable supply voltage selection for the LPC802, but may also be used
as an insertion point for an ammeter to measure current flow to that MCU.
7. Other board features
This section describes other board features not detailed elsewhere in this document.
7.1 ISP booting and the ISP button
The LPC802 can be forced into ISP boot mode by holding down the ISP button (PB1) and
then holding and releasing reset. The ISP button is connected to LPC802 pin PIO0_12,
which is also routed to the Arduino expansion connector and to the cathode of the green
user LED3. LPC802 pin PIO0_12 can be reconfigured by software so that the button can
be used by an application as a general purpose button (refer to the LPC802 User
Manual).
7.2 User button
The Wake button (PB3) is for general purpose use by LPC802 applications. It is
connected to a 10K ohm pullup to 3.3V, and to the LPC802 PIO0_8 pin. It is also shared
with blue User LED1.
7.3 User LEDs
Three users LEDs are provided on the board, one blue, one green and one red. The
anodes of the LEDs are connected together, then through jumper JP7 to the 3.3V
regulator output. JP7 can be opened to prevent leakage from the LPC802 pins through
the diodes if accurate power measurement measurements are being performed. All the
LPC802 ports used to drive the User LEDs are also connected to LEDs on the detachable
section of the board, and are shared with the Arduino expansion connector. The LEDs are
connected to the LPC802 as shown in the table below.
28
GPIO
PIO0_9
User LED2
31
TX
PIO0_0
Debug UART
32
RX
PIO0_4
Debug UART
Table 2.
Arduino expansion connector pin mappings (CN3)
CN3 pin
Arduino signal
LPC802 pin
Shared with