NXP Semiconductors OM13260, Руководство по установке, Страница: 31 / 71

NXP Semiconductors
UMxxxxx
Install Guide
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Preliminary 1
— September 6, 2013
© NXP B.V. 2013. All rights reserved.
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Fig 5.15 Bus1 GPIO 8 bit Section
5.4 Bus Two (Bus2)
The second I2C Bus on the Fm+ Development Board (OM13260) requires the addition of a NXP LPC
Xpresso Module (not included in the kit) to either be the Master, or drive the Bus Controller (PCA9665,
IC4).
There are two almost identical I2C Buses on the Fm+ Development Board (OM13260), called Bus1 and
Bus2. These share a ground and power connection but may be operated independently.
Note: The Bus Voltage for each I2C maybe different (for example 3.3V for one I2C bus, 5V for the
other I2C bus).
5.4.1 Bus 2 Master (LPC Xpresso - MCU LPC1343)
The LPC Xpresso Module contains an NXP LPC1343 MCU (similar to the one on Bus 1) and support
circuits called LPC-Link. See Figure 5.16. The LPC Xpresso requires firmware that is loaded through
either the LPC-Link and USB Bridge, or JTAG Single Wire Debug (SWD) connector. Note: The LPC
Xpresso is not compatible with the NXP GUI, and requires the installation of an IDE for code
development.
The LPC-Link may be powered from the Fm+ Development Board (OM13260), or from a USB Host
(connected to the LPC-Link port). There is a possible conflict that the LCP-Link 3.3V supply will compete
with the Fm+ Development Board (OM13260) 3.3V supply. To avoid this issue the LPC Xpresso Module
can provide its own 3.3V power by removing jumper JP1 on the Fm+ Development Board (OM13260).
See figure 5.17.