DM368ZCEZ datasheet(78/208 Pages) TI1

78 / 208 page

TMS320DM368

SPRS668C

– APRIL 2010 – REVISED JUNE 2011

www.ti.com

Table 6-1. Power Supplies (continued)

CUSTOMER

TOLERANCE

PACKAGE

DEVICE PLANE

DESCRIPTION

BOARD SUPPLY

PLANE

0 V

VSSA

PLL ground

Note: For proper device operation, keep separate from digital

ground VSS.

0 V

VSSA18_USB

USB ground

0 V

VSSA33_USB

3.3-V USB ground

0 V

VSSA33_VC

3.3-V Voice Codec Module ground

0 V

VSSA18_VC

1.8-V Voice Codec Module ground

0 V

VSSA_ADC

Analog-to-digital converter (ADC) ground

0 V

VSSA18_DAC

1.8-V DAC ground

0 V

VSSA12_DAC

1.2-V DAC ground

VDD18_DDR*0.5

DDR_VREF

DRR reference voltage

(VDDS divided by 2, through board resistors)

0.5V

±5%

VREF

DAC reference voltage

5.25V

USB_VBUS

VBUS

6.4

Power-Supply Sequencing

In order to ensure device reliability, the device requires the following power supply power-on and

power-off sequences. See Section 5.2, Recommended Operating Conditions, for a description of the

power supplies.

•

The following power sequences are recommended to prevent damage to the device.

•

The PRTCSS core must always be powered-on and powered-off regardless of whether the PRTCSS

feature is used.

•

If the PRTCSS sequencer is to be used in any PRTCSS modes, please refer to the TMS320DM36x

PRTCSS User's Guide (literature number SPRUFJ0) for more details on the differences to the power

sequence.

6.4.1

Simple Power-On and Power-Off Method

The following steps must be followed in sequential order for the simple power-on method:

1. Power on the PRTCSS/ Main core (1.35-V).

2. Power on the PRTCSS/Main I/O (1.8-V).

3. Power on the Main/Analog I/O (3.3-V).

Note for simple power-on: RESET must be low until all supplies are ramped up.

The following steps should be followed for the simple power-off method:

1. Power off the Main/Analog I/O (3.3-V).

2. Power off the PRTCSS/Main I/O (1.8-V).

3. Power off the PRTCSS/Main core (1.35-V).

Notes for simple power-off:

– If RESET is low, steps 2 and 3 may be performed simultaneously.

– If RESET is not low, these steps must be followed sequentially.

6.4.2

Restricted Power-On and Power-Off Method

The following steps should be followed for the restricted power-on method:

1. Power on the PRTCSS/ Main core (1.35-V).

2. Power on the PRTCSS/Main I/O (1.8-V).

3. Power on the Main/Analog I/O (3.3-V).

Notes for restricted power-on:

Peripheral Information and Electrical Specifications

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