AT43USB326-AU Atmel, AT43USB326-AU Datasheet - Page 4

• Manufacturer Part Number: AT43USB326-AU
• Description: IC USB KEYBOARD CTRLR 48LQFP
• Manufacturer: Atmel
• Series: AVR®r

Specifications of AT43USB326-AU

• Applications: Keyboard Controller
• Core Processor: AVR
• Program Memory Type: Mask ROM (16 kB)
• Controller Series: AT43USB
• Ram Size: 512 x 8
• Interface: USB
• Number Of I /o: 32
• Voltage - Supply: 4.4 V ~ 5.25 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Signal Description
4
Name
V
V
CEXT1, 2
XTAL1
XTAL2
LFT
DPO
DMO
DP[2,3]
DM[2,3]
PA[0:7]
PB[0:7]
PC[0:7]
PD[0:1]
PE[0:1]
PE[4:7]
TEST
RESETN
CC
SS1
,
2
AT43USB326
Input
Output
Input
Bi-directional
Bi-directional
Bi-directional
Type
Power Supply/Ground
Power Supply/Ground
Power Supply/Ground
Bi-directional
Bi-directional
Bi-directional
Bi-directional
Bi-directional
Bi-directional
Bi-directional
Input
Input
Function
5V Digital Power Supply
External Capacitors for Power Supplies – High quality 2.2 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 0.1 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[2,3] and DM[2,3] 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 controlled slew rate. These pins are
used as eight of the keyboard matrix column output strobes. PA[0:7] = COL[0:7].
Port B[0:7] – Bi-directional 8-bit I/O port controlled slew rate. These pins are used
as the eight of the keyboard matrix column output strobes: PB[0:7] = COL[8:15].
Port C[0:7] – Bi-directional 8-bit I/O port with internal pull-ups. These pins are used
as keyboard matrix row input signals. PC[0:7] = ROW [0:7].
Port D[0:1] – Bi-directional I/O ports.
Port E[0:1] – Bi-directional I/O port with controlled slew rate which can be used as
two additional keyboard column output strobes, COL 16, 17.
PE[4:7] have built-in series limiting resistors and can be used to drive LEDs
directly.
Test Pin – This pin should be tied to ground.
Reset – Active Low.
Ground
3313D–USB–04/06