Description Of Uem

UEM (Universal Energy Management) IC. In addition to energy management functionality UEM performs all the baseband mixed-signal functions. Current version number is UEMK. The main features of the UEM are: 168-pin uBGA package (14 x 14 mm, 0.8 pitch)

• 32 kHz startup RC oscillator
• Startup logic
• Real time clock logic
• Crystal oscillator (32 kHz)
• Baseband regulators:

Ø VANA 2.78 V for analogue functions
Ø VIO 1.8 V for logic I/Os and UEM logic
Ø VFLASH2 2.78 V for FMRADIO
Ø VFLASH1 2.78 V for IR, LCD AND LED driver
Ø VCORE programmable 1.0 – 1.8 V (using 1.8V) for UPP
Ø VSIM 1.8/3.0 V for SIM

• RF regulators

Ø Six 2.78 V for RF
Ø 4.75 V Charge pump for RF
Ø Two programmable (0-5mA) current regulators for

• Charging functions
• Bandgap reference and voltage reference needed for analogue blocks
• FBUS and MBUS interface
• IR interface level shifters
• Buzzer and vibrator interface
• Audio codec

Ø Earpiece driver
Ø Headset driver
Ø Microphone pre-amplifier
Ø Digital filter (UPP/DSP)
Ø TX programmable gain stage
Ø TX _∆ A/D converter
Ø RX programmable attenuation stage
Ø RX _∆ D/A converter
o One bit DAC

• FLASH memory for IMEI code and tuning values storage
• Security logic
• SIM interface
• Serial control interface

Ø DSP controlled serial bus (Dbus)
Ø MCU controlled serial bus (Cbus)

• 11-channel A/D converter (MCU controlled)
• Auxiliary A/D converted (DSP controlled)
• RF interface converters

Ø AFC D/A
Ø AUX D/A
Ø TXIQ D/A
Ø RXIQ analogue _∆ A/D converter