Power management

ST7580

20/33

Doc ID 022644 Rev 1

Figure 9.

Power supply internal scheme and external connections

6.1

Ground connections

The ST7580 presents analog and digital ground connections. In particular, VSS is the power

ground, VSSA is the analog ground, while GND pins refer to digital ground.

It is recommended to provide external connections between the ground pins as follows:

●

GND pins 6, 14, 33, and 45 are connected together;

●

VSSA pins 15 and 35 are connected to the exposed pad;

●

VSS is also connected to the exposed pad;

●

Connection between VSSA and GND is provided through a ferrite bead.

Ferrite Bead

LDO

LDO

AFE

DIGITAL INTERFACES

DIGITAL CORE

INTERNAL PLL

PA

VSS

VCCA

VSSA

VDD_REG_1V8

GND

VDD

VDD_PLL

VSSA

LDO

LDO

INTERNAL PLL

VCC

VDDIO

VSS

VCCA

VSSA

GND

AM02509v1