atr0621-ek1 ATMEL Corporation, atr0621-ek1 Datasheet - Page 19

• Manufacturer Part Number: atr0621-ek1
• Description: Atr0622p Gps Baseband Processor
• Manufacturer: ATMEL Corporation

Figure 4-3.
4891F–GPS–09/07
USB-VSB 5V
External Wiring Example Using Internal LDOs, USB Supply Voltage and Backup Power Supply
LDO 3.3V
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.
External
1 µF
(X7R)
NSHDN
1.5V to 3.6V
1 µF
(X7R)
LDOBAT_IN
LDO_OUT
VDDUSB
LDO_EN
LDO_IN
VBAT18
VDD18
VDDIO
VBAT
ldoin
ldoen
ldoout
ldobat_in
vbat
vbat18
variable IO Domain
Backup Memory
USB SM and
1.8V to 3.3V
Transceiver
Core
RTC
ATR0622P internal
LDOBAT
LDO18
vdd
ATR0622P
19