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LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. TECHNICAL BRIEF
GS290 Operational Description Revision B
LG Electronics 53/136 LGE Property
Figure 21.U-USB Connector circuit
The MAX14526 is a complete solution for multiplexing USB, UART and audio on a single mini/micro USB
connector. It contains an internal method for determining the device connected and uses an I2C bus for
control.
The switch will multiplex multiple inputs (USB, UART,Microphone, Stereo and Audio) on one mini/microUSB
connector. The USB and UART inputs support Hi-Speed USB and the audio inputs feature negative rail signal
operation allowing simple dc coupled headset speakers. The VB connection is protected against faults up to 28
volts. There is an internal device detection method which uses the USB ID signal pin and the voltage on VBUS.
Each accessory will have a unique detection based on resistor values and voltage on VBUS. The host
microprocessor uses I2C to control the switch position as well as read the results of the accessory detection.
The MAX14526 will also detect USB chargers including dedicated chargers (D+/D- shorted) and high power
host/hub chargers.
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