AT43USB320A_04 ATMEL [ATMEL Corporation], AT43USB320A_04 Datasheet - Page 5

• Manufacturer Part Number: AT43USB320A_04
• Description: Full-speed USB Microcontroller with an Embedded Hub
• Manufacturer: ATMEL [ATMEL Corporation]

Signal Description
1443E–USB–4/04
Name
V
V
CEXT1, 2
XTAL1
XTAL2
LFT
DPO
DMO
DP[1:4]
DM[1:4]
PA[0:7]
PB[0:7]
PC[0:7]
PD[0:7]
TESTN
SUSPEND
CC
SS
Type
Power Supply/Ground
Power Supply/Ground
Power Supply/Ground
Input
Output
Input
Bi-directional
Bi-directional
Bi-directional
Bi-directional
Bi-directional
Bi-directional
Bi-directional
Bi-directional
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
PB0
PB1
PB4
PB5
PB6
PB7
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
PD0
PD1
PD2
PD3
PD5
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.
Alternate Function
T0, Timer/Counter0 External Input
T1, Timer/Counter1 External Input
SSN, SPI Slave Port Select or SCL, I2C Serial Bus Clock
MOSI, SPI Slave Port Select Input
MISO, SPI Master Data In, Slave Data Out
SCK, SPI Master Clock Out, Slave Clock In
Alternate Function
RXD, Serial Input Port
TXD, Serial Input Port
INT0, External Interrupt 0
INT1, External Interrupt 1
OC1A Timer/Counter1 Output Compare A
AT43USB320A
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