AT89C5131A-L View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT89C5131A-L

8-bit Flash Microcontroller with Full Speed USB Device

Atmel Corporation 

Table 12. Power Signal Description

Signal

Name Type Description

AVSS

GND

Alternate Ground

AVSS is used to supply the on-chip PLL and the USB PAD.

AVDD

PWR

Alternate Supply Voltage

AVDD is used to supply the on-chip PLL and the USB PAD.

VSS

GND

Digital Ground

VSS is used to supply the buffer ring and the digital core.

VDD

PWR

Digital Supply Voltage

VDD is used to supply the buffer ring on all versions of the device.

It is also used to power the on-chip voltage regulator of the Standard

versions or the digital core of the Low Power versions.

VREF

USB pull-up Controlled Output

O VREF is used to control the USB D+ 1.5 kΩ pull up.

The Vref output is in high impedance when the bit DETACH is set in the

USBCON register.

Alternate

Function

-

-

-

-

-

10 AT89C5131A-L

4338E–USB–06/06

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