AT89C5131A-RDTIM datasheet(11/186 Pages) ATMEL

Part #	AT89C5131A-RDTIM

Description	8-bit Flash Microcontroller with Full Speed USB Device

PDF	186 Pages

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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AT89C5130A/31A-M

4337G–USB–11/06

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.

UCAP

PWR

USB Pad Power Capacitor

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

(for typical application see Figure 4 on page 12)

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

VREF is used to control the USB D+ 1.5 k

Ω pull up.

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

USBCON register.

Table 12.

Power Signal Description (Continued)

Signal

Name

Type

Description

Alternate

Function

AT89C5131A-RDTIM Datasheet(PDF) 11 Page - ATMEL Corporation