AM1806_1005 Datasheet, PDF (65/241 Pages) Texas Instruments – AM1806 ARM Microprocessor

AM1806
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SPRS658B – FEBRUARY 2010 – REVISED MAY 2010
6.2 Recommended Clock and Control Signal Transition Behavior
All clocks and control signals must transition between V_IH and V_IL (or between V_IL and V_IH) in a monotonic
manner.
6.3 Power Supplies
6.3.1 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.
• 2a) All variable 1.2V - 1.0V core logic supplies (CVDD)
• 2b) All static 1.2V logic supplies (RVDD, VDDA_12_PLL0, VDDA_12_PLL1, 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.
6.3.2 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).
Copyright © 2010, Texas Instruments Incorporated
Peripheral Information and Electrical Specifications
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