at85c51snd3b ATMEL Corporation, at85c51snd3b Datasheet - Page 19

• Manufacturer Part Number: at85c51snd3b
• Description: Single-chip Digital Audio Decoder - Encoder With Usb 2.0 Interface
• Manufacturer: ATMEL Corporation

Power Management
Power Supply
Regulators
7632C–MP3–11/06
The Power Management of AT85C51SND3B dervatives implements all the internal
power circuitry (regulators, links…) as well as power failure detector and reset circuitry.
The AT85C51SND3B2 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 AT85C51SND3B0 and AT85C51SND3B1 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:
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”.
DCPWR
UVCC
BVDD
UVSS
BVSS
DCLI
1. External connection mandatory when 1.8V DC-DC is used.
Battery Monitor
Regulator
1.8 V DC-DC
3 V
HVDET
PSTA.6
UVDET
PSTA.7
To Internal Core
DCPBST
Regulator
PCON.5
DCEN
PCON.3
VBAT
1.8 V
AT85C51SND3B
Optional
Connection
HVDD
VSS
RLVDD
LVDD
(1)
19