AT89C5131A-S3SIM View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT89C5131A-S3SIM

8-bit Flash Microcontroller with Full Speed USB Device

Atmel Corporation 

AT89C5130A/31A-M

Table 12. Power Signal Description (Continued)

Signal

Name Type Description

Alternate

Function

AVDD

PWR

Analog 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.

-

UVSS

GND

USB Digital Ground

UVSS is used to supply the USB pads.

-

USB Pad Power Capacitor

UCAP PWR UCAP must be connect to an external capacitor for USB pad power supply

-

(for typical application see Figure 4 on page 12)

Digital Supply Voltage

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

VDD PWR

-

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

versions or the digital core of the Low Power versions.

USB pull-up Controlled Output

VREF

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.

11

4337G–USB–11/06

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