AM1802 datasheet(49/180 Pages) TI1

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AM1802

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SPRS710C – NOVEMBER 2010 – REVISED MARCH 2012

5.2

Recommended Clock and Control Signal Transition Behavior

All clocks and control signals must transition between VIH and VIL (or between VIL and VIH) in a monotonic

manner.

5.3

Power Supplies

5.3.1

Power-On Sequence

The device should be powered-on in the following order:

1. RTC (RTC_CVDD) may be powered from an external device (such as a battery) prior to all other

supplies being applied or powered-up at the same time as CVDD. If the RTC is not used, RTC_CVDD

should be connected to CVDD. RTC_CVDD should not be left unpowered while CVDD is powered.

2. Core logic supplies:

(a) All variable 1.2V - 1.0V core logic supplies (CVDD)

(b) All static core logic supplies (RVDD, PLL0_VDDA, PLL1_VDDA, USB_CVDD). If voltage scaling is

not used on the device, groups 2a) and 2b) can be controlled from the same power supply and

powered up together.

3. All static 1.8V IO supplies (DVDD18, DDR_DVDD18, USB0_VDDA18) and any of the LVCMOS IO

supply groups used at 1.8V nominal (DVDD3318_A, DVDD3318_B, or DVDD3318_C).

4. All analog 3.3V PHY supplies (USB0_VDDA33; this is not required if USB0 is not used) and any of the

LVCMOS IO supply groups used at 3.3V nominal (DVDD3318_A, DVDD3318_B, or DVDD3318_C).

There is no specific required voltage ramp rate for any of the supplies as long as the LVCMOS supplies

operated at 3.3V (DVDD3318_A, DVDD3318_B, or DVDD3318_C) never exceed the STATIC 1.8V

supplies by more than 2 volts.

RESET must be maintained active until all power supplies have reached their nominal values.

5.3.2

Power-Off Sequence

The power supplies can be powered-off in any order as long as LVCMOS supplies operated at 3.3V

(DVDD3318_A, DVDD3318_B, or DVDD3318_C) never exceed static 1.8V supplies by more than 2 volts.

There is no specific required voltage ramp down rate for any of the supplies (except as required to meet

the above mentioned voltage condition).

Peripheral Information and Electrical Specifications

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