Atmel AT85DVK-07 Spezifikationen PDF herunterladen (Seite 18)

AT85C51SND3Bx

7632A–MP3–03/06

Power Management The Power Management implements all the internal power circuitry (regulators, links…)

as well as power failure detector and reset circuitry.

Power Supply The AT85C51SND3B3 embeds the regulators and a DC to DC step-up convertor to be

able to operate from either USB power supply (5V nominal) or from a single cell battery

such as AAA battery.

The AT85C51SND3B1 and AT85C51SND3B2 embed the regulators to be able to oper-

ate from either USB power supply (5V nominal) or from an external 3 volts supply.

Figure 5. Power Supply Diagram

Note: 1. External connection mandatory when 1.8V DC-DC is used.

Regulators The high voltage regulator supplies power to the external devices through HVDD power

pin. Its nominal voltage output is 3V.

The low voltage regulator supplies power to the internal device and external devices

through RLVDD power pin. Its nominal voltage output is 1.8V.

Figure 6 shows how to connect external components, capacitors value along with power

characteristics are specified in the section “DC characteristics”.

HVDET

PSTA.6

LVDD

DCPWR

UVCC

UVSS

DCEN

PCON.3

DCLI

HVDD

VSS

BVDD

BVSS

RLVDD

UVDET

PSTA.7

3 V

Regulator

1.8 V DC-DC

Battery Monitor

1.8 V

Regulator

VBAT

Optional

Connection

(1)

DCPBST

PCON.5

To Internal Core

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