AT43USB320A_04 Datasheet, PDF (5/115 Pages) ATMEL Corporation – Full-speed USB Microcontroller with an Embedded Hub

AT43USB320A
Signal Description
Name
Type
V_CC
V_SS
CEXT1, 2
Power Supply/Ground
Power Supply/Ground
Power Supply/Ground
XTAL1
XTAL2
LFT
Input
Output
Input
DPO
DMO
DP[1:4]
Bi-directional
Bi-directional
Bi-directional
DM[1:4]
PA[0:7]
PB[0:7]
Bi-directional
Bi-directional
Bi-directional
PC[0:7]
PD[0:7]
Bi-directional
Bi-directional
TESTN
SUSPEND
Input
Output
Function
5V Power Supply
Ground
External Capacitors for Power Supplies – High quality 0.33 µF capacitors must
be connected to CEXT1 and 2 for proper operation of the chip.
Oscillator Input – Input to the inverting oscillator amplifier.
Oscillator Output – Output of the inverting oscillator amplifier.
PLL Filter – For proper operation of the PLL, this pin should be connected through
a 0.01 µF capacitor in parallel with a 100Ω resistor in series with a 0.22 µF
capacitor to ground (VSS). Both capacitors must be high quality ceramic.
Upstream Plus USB I/O – This pin should be connected to CEXT1 through an
external 1.5 kΩ.
Upstream Minus USB I/O
Downstream Plus USB I/O – Each of these pins should be connected to VSS
through an external 15 kΩ resistor. DP[1:4] and DM[1:4] are the differential signal
pin pairs to connect downstream USB devices.
Downstream Minus USB I/O – Each of these pins should be connected to VSS
through an external 15 kΩ resistor.
Port A[0:7] – Bi-directional 8-bit I/O port with 4 mA drive strength.
Port B[0:7] – Bi-directional 8-bit I/O port with 4 mA drive. 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
Port C[0:7] – Bi-directional 8-bit I/O port with 4 mA drive strength.
Port D[0:7] – Bi-directional I/O ports with 4 mA drive strength. PD[0:3,5] have dual
functions as shown below:
Port Pin
Alternate Function
PD0
RXD, Serial Input Port
PD1
TXD, Serial Input Port
PD2
INT0, External Interrupt 0
PD3
INT1, External Interrupt 1
PD5
OC1A Timer/Counter1 Output Compare A
Test Pin – This pin should be tied to ground.
Suspend – This pin is asserted when the AT43USB320A enters the Suspend
status. In the 55618D, it is active low and in the 55618E and later versions, it is
active high.
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1443E–USB–4/04