參數(shù)資料
型號(hào)： ATR0621N-7FQY
廠商： ATMEL CORP
元件分類： 無(wú)繩電話/電話
英文描述： TELECOM, CELLULAR, BASEBAND CIRCUIT, PBGA100
封裝： 9 X 9 MM, 0.80 MM PITCH, ROHS COMPLIANT, LFBGA-100
文件頁(yè)數(shù)： 15/31頁(yè)
文件大?。?/td> 477K
代理商： ATR0621N-7FQY
22
4890C–GPS–10/06
ATR0621
The baseband IC contains a built in low dropout voltage regulator LDO18. This regulator can be
used if the host system does not provide the core voltage VDD18 of 1.8V nominal. In such case,
LDO18 will provide a 1.8V supply voltage from any input voltage VDD between 2.3V and 3.6V. It
will also allow supplying external components such as FLASH memory with 1.8V. The LDO_EN
input can be used to shut down VDD18 if the system is in standby mode.
If the host system does however supply a 1.8V core voltage directly, this voltage has to be con-
nected to the VDD18 supply pins of the baseband IC. LDO_EN must be connected to GND.
LDO_IN can be connected to GND. LDO_OUT must not be connected.
A second built in low dropout voltage regulator LDOBAT provides the supply voltage for the RTC
and backup SRAM from any input voltage VBAT between 1.5V and 3.6V. The backup battery is
only discharged if VDD - supplied via pin LDOBAT_IN - is shut down.
Only after VDD18 has been supplied to ATR0621 the RTC section will be initialized properly. If
only VBAT is applied first, the current consumption of the RTC and backup SRAM is
undetermined.
Figure 4-2.
External Wiring Example Using 1.8V from Host System and Backup Power
Supply
ATR0621 internal
VDDUSB
0V or 3V to 3.6V
1.5V to 3.6V
1 F
(X7R)
ldoout
ldoen
ldoin
LDO18
LDO_IN
1 F
(X7R)
VDDIO
LDO_EN
VDD18
LDO_OUT
USB SM and
Transceiver
1.8V to 3.3V
variable IO Domain
RTC
Backup Memory
Core
vbat18
vbat
vdd
ldobat_in
LDOBAT
LDOBAT_IN
VBAT
VBAT18
2.3V to 3.6V
1.65V to 1.95V
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