– 5-20 –
9
Power Off Control
EB-X400 may be powered down either by a command from E-Gold + V3 or if the battery voltage drops below 2.84 V
±
60 mV.
Usually the RTC regulator will continue operation. The RTC regulator is turned off when the battery voltage has dropped
below 2.05 V
±
0.1 V.
■
Power Source Failure detection
The SIM card contains EEPROM, if power fails while the SIM is active, the SIM may corrupt its memory as the supply voltage
drops out of specification.
The shutdown voltage is detected by the E-Power which monitor the VBATS terminal. This typically occurs when the main
battery voltage drops below about 2.84 V
±
0.06 V.
■
Voltage Regulation
Each power sources are specified as follows.
V_SD : Baseband power supply for Digital core [V_SD]
Voltage: 1.83 V
±
0.06V
Current: 180 mA max.
Dropout: 100 mV max (load max)
VINT : Power supply for E-Gold + V3 I/O [VINT]
Voltage: 2.62 V
±
0.10 V
Current: 50 mA max.
Dropout: 150 mV max (load max)
V3V : Power supply for mobile SRAM and polytone IC [V3V]
Voltage: 2.85 V
±
0.10 V
Current: 50 mA max.
Dropout: 150mV max (load max)
VANA : Power supply for analogue part [VANA]
Voltage: 2.39 V
±
0.09 V
Current: 180 mA max.
Dropout: 150 mV max (load max)
VRTC : Power supply for external RTC [VRTC]
Voltage: 2.05 V
±
0.10 V
Current: 300
µ
A max.
V28 : Digital Power supply for upper unit [V28]
Voltage: 2.80 V
±
2 %
Current: 50 mA max.
Dropout: 10 mV max (load max)
■
Battery Charging & Monitoring
The status of the LCD battery icon is determined by the value of 'BAT_VOLT' returned from E-Power, as per the following
table:
Battety pack
Icon Status
Li+ (EB-X400)
3 bar
3.77 V <
2 bar
3.68 V <
< 3.77 V
1 bar
3.46 V <
< 3.46 V
Low Voltage Alarm
< 3.46
Содержание EB-X400
Страница 86: ...12 1 12 LAYOUT DIAGRAMS 12 1 Main Board U2001 ...
Страница 87: ...12 2 ...
Страница 88: ...12 2 Upper Face PCB 12 3 Green Black Black White ...
Страница 89: ...12 3 Hinge PCB 12 4 ...
Страница 90: ...12 4 SIM PCB 12 5 ...