UM11081
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© NXP B.V. 2017. All rights reserved.
User Manual
Rev. 1.01 — 6 December 2017
10 of 13
NXP Semiconductors
LPCXpresso802
User Manual
7.4 Temperature sensor (LM75)
An NXP temperature sensor is included on the LPCXpresso802. This device interfaces to
the I2C peripheral of the LPC802, with an address of 0x1001100. Zero ohm resistors (R60
and R61) are provided in-line with the SDA and SCL signals so that this devices may be
disconnected if not required.
7.5 SPI flash (Winbond W25X10CLSNIG)
A 1Mb SPI flash from Winbond is included on the LPCXpresso802. This device interfaces
to the SPI peripheral of the LPC802. A jumper (JP8) is provided to this device can be
disconnected (by disabling the SPI chip select PIO_11).
7.6 Detachable section
The LPCXpresso802 incorporates a detachable section, with LEDs and a potentiometer,
intended for demonstration development. The LEDs are in the shape of an emoji face,
driven by a combination of 5 GPIOs, with the LEDs lighting then the associated GPIO is
driven low. The outer ring of the face (red LEDs) is controlled by PIO0_17, via a transistor.
The eyes (blue LEDs) are driven by PIO0_8, the top lip (green LEDs) by PIO0_7, the
bottom lip by PIO0_12 and the sides of the mouth (green LEDs) by PIO_9.
Potentiometer RV1 is connected to the voltage reference set by JP2 (either 1.8V or 3.3V,
or a voltage injected via the center pin of this jumper). The wiper of the potentiometer is
connected to PIO0_15 (which also connects to the A0 signal on the Arduino expansion
connector).
The Detachable Section of the board can be separated from the rest of the board by
applying pressure along the line shown in
Figure 3
, while gently bending the board. Once
the sections of the board have been separated, the Detachable Section and still be used
with the main board by soldering connectors into CN6, CN8 and CN9. The Detachable
Section can then be plugged into the CN3 Arduino headers, aligning the gap between
CN6 and CN9 with the gap in the right hand part of CN3 (assuming the board is oriented
as shown in this Figure).
Table 3.
User LED connections
LED
LPC802 pin
Blue (LED1)
PIO0_8
Red (LED2)
PIO0_9
Green (LED3) PIO0_12