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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 5.3 Power Supply and USB Section
5.2.2 USB Interface
The USB Host connector (CN5) provides DC Power and USB connectivity using the MCU (IC5) hardware
interface, see figure 5.3 and figure 5.4. USB data lines are terminated by resistors (R27 and R28) and
protected by an ESD network (IC7). To signal to the host that the USB connection is required the USB
signal DP is pulled to 3.3V via a resistor (R18) and a transistor (Q1). USB Connection is controlled by the
MCU (IC5) via signal CON_EN and can be disabled by removing a jumper (JP3) “CONNECT”. When the
MCU requests a USB connection, and the jumper (JP3) is installed the green LED (D9) is on. MCU
activity is displayed by the Heart Beat green LED (D8), which is set to blink at about one per second.
Fig 5.4 USB Interface
Summary of Contents for OM13260
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