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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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AT43USB353M Scheda tecnica(PDF) 3 Page - ATMEL Corporation |
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AT43USB353M Scheda tecnica(HTML) 3 Page - ATMEL Corporation |
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3 / 95 page  3 AT43USB353M 3307B–USB–4/04 Signal Description Name Type Function VCC1, 2 Power Supply/Ground 5V Digital Power Supply VCCA Power Supply/Ground 5V Power Supply for the ADC V SS1, 2 Power Supply/Ground Digital Ground V SSA Power Supply/Ground Ground for the ADC 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. 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. CPUSEL Input CPU Speed Select – This pin selects the CPU clock frequency. If high, the CPU runs at 12 MHz, if low it runs at 24 MHz. 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. PD[0:6] Bi-directional Port D[0:6] – Bi-directional I/O ports with 2 mA drive strength and a programmable pull-up resistor. PortD[2,3,5,6] have dual functions as shown below: Port Pin Alternate Function PD2 INT0, External Interrupt 0 PD3 INT1, External Interrupt 1 PD4 ICP, Timer/Counter/Input Capture PD5 OC1A Timer/Counter1 Output Compare A PD6 OC1B Timer/Counter1 Output Compare B ADC[0:11] Input ADC Input[0:11] – 12-bit input pins for the ADC. TEST Input Test Pin – This pin should be tied to ground. RESETN Input Reset – Active Low. |
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