Power Supply Decoupling

To reduce any potential fluctuation on the power supply lines, decoupling capacitors, bypass capacitors, and other power supply filtering techniques must be used.

The following table lists the recommended number of PCB decoupling capacitors for an M2S050T/M2GL050T-FG896 device.

Table 1. Power Supply Decoupling Capacitors

Pin Name

Number of Pins

Ceramic Caps

Tantalum Caps

   

0.01 μF

0.1 μF

10 μF

33 μF

22 μF

47 μF

100 μF

220 μF1

330 μF

VDD

24

12

12

1

3

1

VDD10

29

14

14

2

VDDI1

4

2

2

1

VDDI2

4

2

2

1

VDDI3

5

2

3

1

VDDI4

3

2

1

1

VDDI5

29

14

14

2

VDDI6

1

1

1

VDDI7

6

3

3

1

VDDI8

5

2

3

1

VDDI9

1

1

1

VPP

4

2

2

1

VREF0

3

2

1

1

VREF5

3

2

1

1

VPPNVM

1

1

1

SERDES_0_VDD

2

1

1

12

SERDES_1_VDD

2

1

1

12

SERDES_0_L01_VDDAIO

1

12

12

13

SERDES_0_L23_VDDAIO

1

12

12

13

SERDES_1_L01_VDDAIO

1

12

12

13

SERDES_1_L23_VDDAIO

1

12

12

13

CCC_NE0_PLL_VDDA

1

1

1

CCC_NE1_PLL_VDDA

1

1

1

CCC_NW0_PLL_VDDA

1

1

1

CCC_NW1_PLL_VDDA

1

1

1

CCC_SW0_PLL_VDDA

1

1

1

CCC_SW1_PLL_VDDA

1

1

1

MSS_FDDR_PLL_VDDA

1

1

1

MSS_PLL_MDDR_VDDA

1

1

1

PLL_SERDES_0_VDDA

1

1

1

PLL_SERDES_1_VDDA

1

1

1

SERDES_0_L01_VDDAPLL

1

1

1

SERDES_0_L23_VDDAPLL

1

1

1

SERDES_1_L01_VDDAPLL

1

1

1

SERDES_1_L23_VDDAPLL

1

1

1

Notes:
  1. 1.220 μF is used to limit surge current for the VDD supply.
  2. 2.Single ceramic decoupling capacitor is required for both the pins at the device.
  3. 3.Single ceramic decoupling capacitor is required for four pins at the device.

The following table lists the recommended decoupling capacitors for the SmartFusion2/IGLOO2 devices. For placement and routing details, see Layout Guidelines for SmartFusion2- and IGLOO2-Based Board Design.