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AT43USB351M Datasheet(PDF) 4 Page - ATMEL Corporation |
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AT43USB351M Datasheet(HTML) 4 Page - ATMEL Corporation |
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4 / 101 page  4 AT43USB351M 3302E–USB–7/04 Signal Description Name Type Function V CC1, 2 Power Supply/Ground 5V Digital Power Supply VCCA Power Supply/Ground 5V Power Supply for the ADC VSS1, 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 CEXT2 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 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[4:7] Bi-directional Port B[4:7] – Bi-directional 8-bit I/O port with 2 mA drive strength and a programmable pull-up resistor. PB[4:7] have dual functions as shown below: Port Pin Alternate Function 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 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[2:6] 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. 2XN Input Clock Frequency Selector (Table 1 on page 6) |
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