Datasheet

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

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