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AT43USB326 Datasheet(PDF) 4 Page - ATMEL Corporation |
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AT43USB326 Datasheet(HTML) 4 Page - ATMEL Corporation |
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4 / 102 page  4 AT43USB326 3313D–USB–04/06 Signal Description Name Type Function VCC Power Supply/Ground 5V Digital Power Supply V 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. |
Similar Part No. - AT43USB326_06 |
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Similar Description - AT43USB326_06 |
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