Panasonic EB-GD67 Service Manual

Also see for EB-GD67: Operating instructions

TECHNICAL DESCRIPTIONIssue 1 Section 4 MMCD020801C8Revision 0 – 16 – Service Manual• VRMEM: Power supply used by Baseband Digital part.Supplies CALYPSO memory interface and external memory components. Selectable between 1.8 V and 2.8 V.• VRRAM: Power supply for external SRAM.Supplies the SRAM of U640. When the handset is powered down and the supply is switched off, the external SRAM issupplied from the backup cell to maintain the contents. This regulator is diode protected from reverse supply.• VRABB: Digital power supply for IOTA Analogue section.Supplies power for the IOTA onboard analogue section.• VRSIM: Digital Power supply for SIM card.Supplies power for the SIM card. Selectable from 1.8 V an 2.85 V.• VRTC: Digital power supply for CALYPSO 32 kHz oscillator and RTC module.Supplies power for the CALYPSO 32 kHz oscillator and RTC module. Selectable from 1.18 V, 1.4 V and 1.8 V. It issupplied from UPR to enable it to be maintained from the backup cell when the main battery is removed.4.5.6 Regulator Sleep FunctionTo reduce power consumption in the analogue section of the baseband chipset, the voltage regulators can be placed in a lowpower mode or disabled by the processor when it enters a low activity sleep mode. During sleep mode, VRABB is disabled,and VRDBB, VRIO, VRMEM, VRRAM and VRSIM are switched to low power mode.Voltage 2.8 V ±0.1 VCurrent 60 mA max.Dropout 100 mV max (load max)Supply VBATVoltage 2.8 V ±0.1 VCurrent 50 mA max.Dropout 100 mV max (load max)Supply VBATVoltage 2.8 V ±0.1 VCurrent 80 mA max.Dropout 100 mV max (load max)Supply VBATVoltage 1.8 V ±0.15 VCurrent 10 μA max.Dropout 100 mV max (load max)Supply VBATVoltage 1.8 V ±0.15 VCurrent 10 μA max.Dropout 100 mV max (load max)Supply UPR