LG KE820 Service Manual page 55

3. TECHNICAL BRIEF
• Autonomous power down scenarios of Bluetooth and cellular system supported
• Packages:
- P-VQFN-48 package
- P-WFLGA-56 package
• Temperature range from -40°C up to 85°C
• Boundary scan for interface lines via JTAG
3.17.2 Micro-Controller-Section
• ARM7TDMI-STM ARM® Processor for protocol and application software
• Timers + Watchdog + Interrupt Module
3.17.3 Micro-Controller Memory
• 32 KByte RAM
• 256 KByte read only Program Memory
• 8 KByte Patch RAM
3.17.4 Interfaces
• UART (Bluetooth - Interface, support for HCI UART and Three-Wire UART transport layers
with/without hardware handshaking) up to 3.25MBaud
• Two channel PCM Audio interface with I2S mode
• I2C Interface
• Three channel full duplex CVSD trans coder
• General Purpose I/Os
- External interrupt
- Port output levels available during low-power mode (VDD supplied)
• Separate voltage domains for GPIO, UART and PCM interfaces
• Control signal for requesting external (cellular) system clock
• Multi frequency (e.g. 32.768 kHz) low power clock input
3.17.5. RF-Section
• Integrated antenna switch to minimize external components count
• Programmable RF transmit power between -55dBm...+6dBm
- Fine tuning in 2dB programmable steps also supported
• 20dBm power class 1 supported with external power amplifier
- Separate TX output interface to PA (bypass of internal T/R switch)
- Digital power step control
• Receiver sensitivity typ. -90dBm
• High performance integrated LNA with excellent blocking and inter modulation performance
• Low-IF receiver topology eliminates external IF filters
• Digital demodulation for optimum sensitivity and co- / adjacent channel performance
- Digital offset compensation, symbol and frame synchronization
• RSSI information for power control
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