Rainbow-electronics ATR0622 Manual do Utilizador descarregar pdf (Página 17)

4891CS–GPS–01/06

ATR0622 [Preliminary]

4. Power Supply

The baseband IC is supplied with four distinct supply voltages:

• VDD18, the nominal 1.8V supply voltage for the core, the RF-I/O pins, the memory

interface and the test pins and all GPIO-pins not mentioned in next item.

• VDDIO, the variable supply voltage within 1.8V to 3.6V for following GPIO-pins: P1, P2, P8,

P12, P14, P16, P17, P18, P19, P20, P21, P23, P24, P25, P26, P27 and P29 In input mode,

these pins are 5V input tolerant.

• 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,

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.

Figure 4-1, Figure 4-2, and Figure 4-3 show examples of the wiring of ATR0622 power supply.

Figure 4-1. External Wiring Example Using Internal LDOs and Backup Power Supply

ATR0622 internal

VDDUSB0 to 2V or 3V to 3.6V

1.5V to 3.6V

1 µF

(X7R)

ldoout

ldoen

ldoin

LDO18

LDO_IN

1 µF

(X7R)

VDDIO

2.3V to 3.6V

LDO_ENNSHDN

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

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 25 26

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