STV8206 datasheet(29/97 Pages) STMICROELECTRONICS

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STV82x6

Power Supplies

7.1

Supply Voltages

The STV82x6 supports different power configurations due to its integrated voltage regulators.

Typically, two power supplies, which are grouped into two sets of IC pins, are required.

1. Digital Power Supply (DPS) This supply may be either 3.3 V or 5 V if an external power

transistor is used. The DPS supplies pins VDD1, VDD2 and VDDP.

—In 3.3 V mode, the power is directly supplied to the digital power pins. In this case, the REG

pin is not used and must be connected to the ground.

— 5V mode requires the use of an external transistor coupled to the integrated voltage

regulator via the REG pin in order to generate a stable 3.3 V supply to the digital power pins.

2. Analog Power Supply (APS) This supply may be either 8 V or 5 V. In both cases, external

resistors are required, except for pin VDDH. The APS supplies pins VDDIF, VDDC, VDDA and

VDDH.

— The 8 V power supply is directly connected to pin VDDH and offers a 2 VRMS dynamic

voltage on SCART outputs. The other analog power pins can be supplied with an 8 V or 5 V

supply through external resistors.

— If only a 5 V power supply is available for pin VDDH, the SCART outputs will be reduced to

1VRMS. In this case, the SEL5V bit must be set in register ANA_CTRL.

Figure 17: 3.3V / 8V or 3.3V / 5V Application

3.3 V

Regulator

Digital Core

Clock Generator

Analog

REG

VDDH

STV82x6

3.3 V

DPS

Standby

VDD1

VDD2

VDDP

8 or 5 V

APS

Core

Digital

3.3 V

Regulator

Analog

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