LG Electronics LG-C320 service manual Uart, 9 USB, Hkadc

3. TECHNICAL BRIEF

3.1.8 UART

̰One universal asynchronous receiver transmitter (UART) port that supports low-speed, full-speed, and high-speed modes

̰Serial data port communications that conform to the RS-232 interface protocol

̰Used for data transport during Bluetooth operation (BTS402x™ SoC required)

̰Other possible uses:

–Test and debug

–External keypad

–Ringer

–Load/upgrade system software ̰ Separate FIFOs for Rx and Tx ̰ Supporting circuits include:

–Interrupt control

–Clock source

–Bit-rate generator (BRG)

–Microprocessor interface

̰Flow control is not available on UART2 (behind USIM)

3.1.9 USB

̰Each USB link has a host and a peripheral; the host is responsible for initiating and controlling bus traffic

̰The USB specification requires PCs to act as hosts, and other devices such as printers, keyboards, mice, etc., to act as peripherals

̰USB 2.0 implementation defines three modes

-Low-speed (LS): 1.5 Mbps

-Full-speed (FS): 12 Mbps

-High-speed (HS): 480 Mbps

̰The QSC62x0 is compliant with the USB 2.0 specification - All three modes are supported when acting as a host

- FS and HS are supported when acting as a peripheral

̰The QSC62x0 has two USB controllers

-Primary USB controller

-Secondary USB controller

̰The primary USB controller is supplemented by an integrated physical layer (PHY)

3.1.10 HKADC

The HKADC includes an analog multiplexer that selects an input for the sample and hold circuit. One of three inputs can be selected:

HKAIN1, pin R22 – an external connection that is available as a general-purpose input, though it is often used to monitor the power amplifier(s) temperature.

An on-chip connection to the power management circuit’s analog multiplexer output. This allows monitoring of: -. Key power supply nodes such as VBAT, VCHG, etc.

-. Multipurpose pins (when configured as analog inputs)

-. A few on-chip parameters such as the die temperature or VREF

LGE Internal Use Only	- 26 -	Copyright © 2010 LG Electronics. Inc. All right reserved.
		Only for training and service purposes