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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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AT43USB355 Scheda tecnica(PDF) 4 Page - ATMEL Corporation |
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AT43USB355 Scheda tecnica(HTML) 4 Page - ATMEL Corporation |
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4 / 115 page  4 AT43USB355 2603G–USB–04/06 Signal Description Name Type Function VCC1, 2, 3 Power Supply/Ground 5V Digital Power Supply V CCA Power Supply/Ground 5V Power Supply for the ADC VSS1, 2, 3 Power Supply/Ground Digital Ground VSSA Power Supply/Ground Ground for the ADC CEXT1, 2, 3 Power Supply/Ground External Capacitors for Power Supplies – High quality 2.2 µF capacitors must be connected to CEXT1, 2 and 3 for proper operation of the chip. CEXTA Power Supply/Ground External Capacitor for Analog Power Supply – A high quality 0.33 µF capacitor must be connected to CEXTA 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 2 mA drive strength and a programmable pull-up resistor. PB[0:7] Bi-directional Port B[0:7] – Bi-directional 8-bit I/O port with 2 mA drive strength and a programmable pull-up resistor. PB[0,1,4:7] have dual functions as shown below: Port Pin Alternate Function PB0 T0, Timer/Counter0 External Input PB1 T1, Timer/Counter1 External Input PB4 SSN, SPI Slave Port Select or SCL, I2C Serial Bus Clock PB5 MOSI, SPI Slave Port Select Input PB6 MISO, SPI Master Data In, Slave Data Out PB7 SCK, SPI Master Clock Out, Slave Clock In |
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