ATR0621P_08 Datasheet, PDF (23/31 Pages) ATMEL Corporation – GPS Baseband GPS Baseband

ATR0621P
The USB Transceiver is disabled if VDD_USB < 2.0V. In this case the pins USB_DM and
USB_DP are connected to GND (internal pull-down resistors). The USB Transceiver is enabled
if VDD_USB within 3.0V and 3.6V.
Figure 4-3. External Wiring Example Using Internal LDOs, USB Supply Voltage and Backup Power Supply
ATR0621P internal
NSHDN
LDO_IN
LDO_EN
LDO_OUT
ldoin
ldoen
ldoout
LDO18
1 µF
(X7R)
VDD18
VDDIO
LDOBAT_IN
1.5V to 3.6V
VBAT
1 µF
(X7R)
VBAT18
USB-VSB 5V
External
LDO 3.3V
VDDUSB
Core
1.8V to 3.3V
variable IO Domain
ldobat_in
vbat
vbat18
LDOBAT
vdd
RTC
Backup Memory
USB SM and
Transceiver
23
4890H–GPS–08/08