PBC02DAAN datasheet(9/38 Pages) ATMEL

Part #	PBC02DAAN

Description	AT90USB1287 (AVR) 64 QFN device (2.7V < VCC < 5.5V)

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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9 / 38 page

Note 1:

For the AT88SA100, AT88SA102, and the AT88SA10HS devices, 5.0V is

required to burn the fuses.

Note 2:

The AT88Microbase is shipped with a 16MHz crystal, which allows the

AT90USB1287 on-chip USART to obtain the 230.4K baud rate (-3.5%

error) required to communicate with a CryptoAuthentication device. The

16MHz crystal requires that

5

.

5

VCC

5

.

4



. To operate the

AT88Microbase below 4.5V, the 16MHz crystal must be replaced with an

8MHz crystal. The ABM3B-8.000MHZ-B2-T 8MHz crystal is a drop-in

replacement.

3.2.2

Power LED, “LEDP”

The blue LED (LEDP) is always lit when power is applied to the AT88Microbase regardless of the

voltage supply.

Figure 4.

Power on LED “LEDP”

3.3

RESET

Although the AT90USB1287 has its on-chip RESET circuitry, (c.f. AT90USB1287 Datasheet,

section “System Control and Reset”), the AT88Microbase provides two additional means to reset

the AT90USB1287.

3.3.1

Power-on Reset

The on-board RC network acts as power-on RESET.

3.3.2

RESET Push Button

By pressing the RESET push button on the AT88Microbase, a warm RESET of the AT90USB1287

AVR is performed.

Figure 5.

RESET Push Button (AVR RESET) Implementation

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PBC02DAAN Datasheet(PDF) 9 Page - ATMEL Corporation

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