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PAM1707BZKB4 Datasheet(PDF) 42 Page - Texas Instruments |
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PAM1707BZKB4 Datasheet(HTML) 42 Page - Texas Instruments |
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42 / 198 page  AM1707 SPRS637A – FEBRUARY 2010 – REVISED APRIL 2010 www.ti.com 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) CVDD core logic supply • 2b) Other 1.2V logic supplies (RVDD, PLL0_VDDA). Groups 2a) and 2b) may be powered up together or 2a) first followed by 2b). • 3) All 1.8V IO supplies (USB0_VDDA18, USB1_VDDA18). • 4) All digital IO and analog 3.3V PHY supplies (DVDD, USB0_VDDA33, USB1_VDDA33). USB0_VDDA33 and USB1_VDDA33 are not required if both USB0 and USB1 are not used) and may be left unconnected.USB0_VDDA33 is not required if USB0 is not used and may be left unconnected. There is no specific required voltage ramp rate for any of the supplies. RESET must be maintained active until all power supplies have reached their nominal values. Note: Future devices may support higher performance at a higher core logic voltage (CVDD). If future migration is desired, the current design should provide separate supplies for 2a) and 2b). If not, then 2a) and 2b) may be provided by a single supply. 6.3.2 Power-off Sequence The power supplies can be powered-off in any order as long as the 3.3V supplies do not remain powered with the other supplies unpowered. 6.4 Unused USB0 (USB2.0) and USB1 (USB1.1) Pin Configurations If one or both USB modules on the device are not used, then some of the power supplies to those modules may not be required. This can eliminate the requirement for a 1.8V power supply to the USB modules. The required pin configurations for unused USB modules are shown below. Table 6-1. Unused USB0 and USB1 Pin Configurations SIGNAL NAME Configuration Configuration (When USB0 and USB1 are not used) (When USB0 is used and USB1 is not used) USB0_DM No connect Use as USB0 function USB0_DP No connect Use as USB0 function USB0_VDDA33 No connect 3.3V USB0_VDDA18 No connect 1.8V USB0_ID No connect Use as USB0 function USB0_VBUS No connect Use as USB0 function USB0_DRVVBUS/GP4[15] No connect or use as alternate function Use as USB0 or alternate function USB0_VDDA12 No connect Internal USB0 PHY output connected to an external filter capacitor USB1_DM No connect Ground USB1_DP No connect Ground USB1_VDDA33 No connect No connect USB1_VDDA18 No connect No connect AHCLKX0/AHCLKX2/USB_REFCLKIN/ No connect or use as alternate function Use as USB0 or alternate function GP2[11] 42 Peripheral Information and Electrical Specifications Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): AM1707 |
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