atr0621p ATMEL Corporation, atr0621p Datasheet - Page 21

• Manufacturer Part Number: atr0621p
• Description: Atr0621p Gps Baseband Processor
• Manufacturer: ATMEL Corporation

4. Power Supply
4890G–GPS–01/08
The baseband IC is supplied with four distinct supply voltages:
Figure
Figure 4-1.
• VDD18, the nominal 1.8V supply voltage for the core, the RF-I/O pins, the memory interface
• VDDIO, the variable supply voltage within 1.8V to 3.6V for following GPIO-pins: P1, P2, P8,
• VDD_USB, the power supply of the USB pins: USB_DM and USB_DP.
• VBAT18 to supply the backup domain: RTC, backup SRAM and the pins NSLEEP, NSHDN,
and the test pins and all GPIO-pins not mentioned in next item.
P12, P14, P16, P17, P18, P19, P20, P21, P23, P24, P25, P26, P27 and P29. In input mode,
these pins are 5V input tolerant.
LDO_EN, VBAT18, P9/EXTIN0, P13/EXTINT1, P22/RXD2 and P31/RXD1 and the 32kHz
oscillator. In input mode, the four GPIO-pins are 5V input tolerant.
2.3V to 3.6V
4-1,
1.5V to 3.6V
Figure 4-2
External Wiring Example Using Internal LDOs and Backup Power Supply
0V or 3V to 3.6V
NSHDN
and
Figure 4-3
1 µF
(X7R)
1 µF
(X7R)
show examples of the wiring of ATR0621 power supply.
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
ATR0621P internal
ATR0621P
LDOBAT
LDO18
vdd
21