Rainbow Electronics ATR0635P1 - Manual (Page 20)

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4979D–GPS–06/08
ATR0635P1
4. Power Supply
The ATR0635P1 is supplied with six distinct supply voltages:
• The power supplies for the RF part (VCC1, VCC2, VBP) within 2.7V to 3.3V.
• VDIG, the 1.8V supply of the digital pins of the RF part (SIGHI, SIGLO and CLK23). VDIG
should be connected to VDD18.
• VDD18, the nominal 1.8V supply voltage for the core, the 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 the 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.