SAMA5D27 datasheet(33/55 Pages) MICROCHIP

33 / 55 page

Power Supply Connections and Timing Sequences

The SAMA5D27 SOM1 can be supplied in different ways depending on application needs.

Four power domains must be supplied and can be connected differently. The four different power connections are

described below:

• Power Configuration #1: All supplies are connected to the Main 3.3V Supply.

• Power Configuration #2: Backup domain is connected to a coin-cell and the rest to the Main 3.3V Supply.

• Power Configuration #3: Backup domain is connected to a coin-cell. Camera sensor is connected to a separate

power supply and the rest to the Main 3.3V Supply.

• Power Configuration #4: All supply domains are connected to separate power supplies.

For each power configuration, the power-on and power-off timing sequences to respect are described below.

6.1

Power Supply Configuration #1

The SAMA5D27 SOM1 is supplied by only one main supply.

In this configuration mode, all supplies are connected together and supplied by the main 3.3V supply. All PIOs have

VDDIN_3V3 Power Rail as voltage reference.

Figure 6-1. Power Configuration #1

SHDN

nRST

VDDSDHC

VDDISC

VDDBU

VDDIN_3V3

nRST

SHDN

3.3V

In this configuration mode, the two following timing sequences are applied.

Figure 6-2. Power-On Sequence Timing Diagram

SYSTEM IS OFF

SYSTEM IS POWERED-UP

RESET IS RELEASED

VDDIN_3V3

MAIN 3.3V IS PRESENT

VDDBU

VDDIN_3V3 LEVEL

VDDISC

VDDIN_3V3 LEVEL

VDDSDHC

VDDIN_3V3 LEVEL

INT_VDD

INTERNAL SUPPLIES GENERATION

SHDN

VDDIN_3V3 LEVEL

nRST

Tmain

Tstart

Tpor

SAMA5D27 SOM1

Power Supply Connections and Timing ...

Datasheet

DS60001521D-page 33

SAMA5D27 Datasheet(PDF) 33 Page - Microchip Technology

SAMA5D27 Datasheet(HTML) 33 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55

Datasheet Download

Link URL