AT43301 View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT43301

Low-cost USB Hub Controller

Atmel Corporation 

AT43301

Table 1-3.

CEXT1

DP0

DM0

DP[1:4]

DM[1:4]

LFT

LPSTAT

48

OSC1

OSC2

OVC

PWR

SELF/BUS

STAT

TEST

VCC

VSS

NC

Signal Descriptions

O

External Capacitor. For proper operation of the on-chip regulator, a 0.27 µF capacitor must be connected to

CEXT1.

Upstream Plus USB I/O. This pin should be connected to the CEXT1 pin through an external 1.5 kΩ pull-up

B resistor. DP0 and DM0 form the differential signal pin pairs connected to the USB host controller or an

upstream Hub.

B Upstream Minus USB I/O.

B

Port Plus USB I/O. This pin 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.

B Port Minus USB I/O. This pin should be connected to VSS through an external 15 kΩ resistor.

I

PLL Filter. For proper operation of the PLL, this pin should be connected through a 2.2 nF capacitor in parallel

with a 100Ω resistor in series with a 10 nF capacitor to ground (VSS).

I

Local Power Status. Schmitt Trigger input pin that is used in the self-powered mode to indicate the condition of the

local power supply. This pin should be connected to the local power supply through a 100 kΩ resistor.

48 MHz Select, 32-lead LQFP only. This pin sets the clock input to the AT43301-AC. If it is tied low, a 48 MHz

I clock must be input to OSC1. If it is tied high (to CEXT1 or to 5V through a 47 kΩ resistor), a 6 MHz crystal must

be connected between OSC1 and OSC2, or a 6 MHz clock input to OSC1.

I Oscillator Input. Input to the inverting 6 MHz oscillator amplifier.

O Oscillator Output. Output of the inverting oscillator amplifier.

Port Overcurrent. This is the Schmitt Trigger input signal used to indicate to the AT43301 that there is a power

I supply problem with the ports. If OVC is asserted, the AT43301 will de-assert PWR and report the status to the

USB Host.

O

Power Switch. This is an output signal to enable or disable the external port power switch for the port power

supply. PWR is de-asserted when an overcurrent is detected at OVC.

I

Power Mode. Schmitt Trigger input pin to set power mode of hub. If high, the AT43301 works in the self-powered

mode. If low, the bus-powered mode.

Status. Output pin which is asserted by the AT43301 whenever it is enumerated. STAT is de-asserted when the

O hub enters the suspend state. An LED in series with a resistor can be connected to this pin to provide visual

feedback to the user.

I Test. This pin has an internal pull up and should be left unconnected in the normal operating mode.

V 5V Power Supply from the USB.

V Ground.

- No Connect. This pin should be left unconnected.

5

1137J–USB–01/06

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