TMS320C6748: Peak Current

Hi,

What’s the peak current of 1.8V power supply for USB0_VDDA18, USB1_VDDA18, SATA_VDDR and DDR_DVDD18?

Have a look at the data manual. Section 5.1 Absolute Maximum Ratings Over Operating Junction Temperature Range (Unless Otherwise Noted) describes the maximum ratings of the 1.8V power supplies.  It is 2V.

2). What’s the peak current of 1.2V power supply for CVDD, RVDD, RTC_CVDD, PLL0_VDDA , PLL1_VDDA ,SATA_VDD and USB_CVDD?

Again the same table describes the maximum voltage for the 1.2V power supplies. It is 1.4V.

NOTE that the above section describes the Absolute maximum ranges of the voltages. The next section in the Data Manual 5.3 Recommended Operating Conditions describes the maximum voltages that are NOT harmful to the SoC.

CVDD ---> max 1.35V  or 1.32V

RVDD ---> max 1.35V  

RTC_CVDD, PLL0_VDDA, PLL1_VDDA, SATA_VDDA --> 1.32V

USB0_VDDA18, USB1_VDDA18, SATA_VDDR, DDR_DVDD18 --> max 1.89V

These values are what we recommend as maximum voltages on the above rails.

3). What’s the lowest voltage of logic high for 3.3V I/O?

See 5.3 Recommended Operating Conditions:
 Voltage Input Low -> VIL -> Low-level input voltage, Dual-voltage I/O, 3.3V ---> 0.8V

See also NOTE 4 bellow the table: These IO specifications apply to the dual-voltage IOs only and do not apply to DDR2/mDDR or SATA interfaces. DDR2/mDDR IOs are 1.8V IOs and adhere to the JESD79-2A standard.

Best Regards,

Yordan

There is Section 5.5 Electrical Characteristics Over Recommended Ranges of Supply Voltage and Operating Junction Temperature (Unless Otherwise Noted). There you have the following currents specified:
Input current (1) (dual-voltage LVCMOS I/Os)
Input current (DDR2/mDDR I/Os)
High-level output current (1) (dual-voltage LVCMOS I/Os)
Low-level output current (1) (dual-voltage LVCMOS I/Os)

Best Regards,
Yordan

Hi,

Ok, I see. I don't think there is a power estimation tool for the TMS320C6748 devices.
You can refer to the C6748 LCDK to see what DCDC are used and how much current they are capable to achieve. I am not aware of other documents for the TMS320C6748 device.

Best Regards,
Yordan