AT43USB326 datasheet(4/102 Pages) ATMEL

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AT43USB326

3313D–USB–04/06

Signal Description

Name

Type

Function

VCC

Power Supply/Ground

5V Digital Power Supply

SS1, 2

Power Supply/Ground

Ground

CEXT1, 2

Power Supply/Ground

External Capacitors for Power Supplies – High quality 2.2 µF capacitors must be

connected to CEXT1 and 2 for proper operation of the chip.

XTAL1

Input

Oscillator Input – Input to the inverting oscillator amplifier.

XTAL2

Output

Oscillator Output – Output of the inverting oscillator amplifier.

LFT

Input

PLL Filter – For proper operation of the PLL, this pin should be connected through

a 0.01 µF capacitor in parallel with a 100

Ω resistor in series with a 0.1 µF capacitor

to ground (VSS). Both capacitors must be high quality ceramic.

DPO

Bi-directional

Upstream Plus USB I/O – This pin should be connected to CEXT1 through an

external 1.5 k

Ω.

DMO

Bi-directional

Upstream Minus USB I/O

DP[2,3]

Bi-directional

Downstream Plus USB I/O – Each of these pins should be connected to VSS

through an external 15 k

Ω resistor. DP[2,3] and DM[2,3] are the differential signal

pin pairs to connect downstream USB devices.

DM[2,3]

Bi-directional

Downstream Minus USB I/O – Each of these pins should be connected to VSS

through an external 15 k

Ω resistor.

PA[0:7]

Bi-directional

Port A[0:7] – Bi-directional 8-bit I/O port with controlled slew rate. These pins are

used as eight of the keyboard matrix column output strobes. PA[0:7] = COL[0:7].

PB[0:7]

Bi-directional

Port B[0:7] – Bi-directional 8-bit I/O port controlled slew rate. These pins are used

as the eight of the keyboard matrix column output strobes: PB[0:7] = COL[8:15].

PC[0:7]

Bi-directional

Port C[0:7] – Bi-directional 8-bit I/O port with internal pull-ups. These pins are used

as keyboard matrix row input signals. PC[0:7] = ROW [0:7].

PD[0:1]

Bi-directional

Port D[0:1] – Bi-directional I/O ports.

PE[0:1]

Bi-directional

Port E[0:1] – Bi-directional I/O port with controlled slew rate which can be used as

two additional keyboard column output strobes, COL 16, 17.

PE[4:7]

Bi-directional

PE[4:7] have built-in series limiting resistors and can be used to drive LEDs

directly.

TEST

Input

Test Pin – This pin should be tied to ground.

RESETN

Input

Reset – Active Low.

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