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Digital Baseband Core (VCORE)
The Digital Baseband Core regulator supplies the digital baseband processor (DBB) core.
The voltage on VCORE is selectable using the VCOREControl register.
The VCOREActive code selects the voltage on VCORE in high power mode and the VCOREStandby
code selects the voltage on VCORE in low-power mode.
DBB Interface (VINT)
The DBB interface regulator supplies the DBB/ABB digital interfaces. The output voltage of the VINT
regulator is nominal 1.8V.
Memory (VMEM)
The VMEM regulator supplies the external memory(s) and the interface to the external memory on the
digital baseband processor. The output voltage of the Memory Interface regulator can be selected as
1.8V nominal or 2.8V nominal using the VMEMSEL terminal.
External Interface (VEXT)
The External Interface regulator supplies the Radio digital interface and the high voltage (>1.8V)
interface between the digital baseband processor and various peripherals, such as the LED indicators
and the LCD display.
SIM Interface (VSIM)
AD6855 is designed to support 3.0 V and 1.8 V SIMs exclusively (i.e. no 5 V SIMs).
The SIM Interface regulator supplies the SIM interface circuitry on the digital processor and the SIM
card. By default the SIM Interface regulator output is 2.85 V, which can be decreased to 1.8 V if a 1.8
V SIM is detected.
Real-Time Clock (VRTC)
The Real-Time Clock regulator supplies the Real-Time Clock module. The Real-Time Clock regulator
is optimized for low ground current.
Baseband Analog (VABB)
The Baseband Analog regulator supplies the analog portions of the AD6855. Operation of the VABB
regulator is controlled by the VABBEn bit in the LDOControl1 register.
If VABBEn = 0, the VABB regultor will be disabled unless the AFCDAC is enabled or VCXOEN = 1. If
VABBEn = 1 (the default state) VABB is enabled along with VCORE, VMEM, and VEXT. The
Baseband Analog regulator is optimized for high ripple rejection and low noise. The output of the
Baseband Analog regulator should not be used as a supply for any external components.
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. TECHNICAL BRIEF
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LGE Internal Use Only
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