AT43312A-AC View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT43312A-AC

Self- and Bus- powered USB Hub Controller

Atmel Corporation 

Signal Description

OSC1

OSC2

LFT

SELF/BUS

LPSTAT

DP0

DM0

DP[1:4]

DM[1:4]

OVC[1:4]

PWR[1:4]

STAT[1:4]

CEXT

TEST

VCC

VSS

AT43312A

Oscillator Input. Input to the inverting 6 MHz 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

2.2 nF capacitor in parallel with a 100Ω resistor in series with a 10 nF capacitor to

ground (VSS).

Hub Power Mode. Input signal that sets the bus or self-powered mode operation. A high

on this pin enables the self-powered mode, a low enables the bus-powered mode.

Local Power Status. In the self-powered mode, this is an input pin that should be con-

nected to the local power supply through a 47 kΩ resistor. The voltage on this pin is

used by the chip for reporting the condition of the local power supply. In the bus-pow-

ered mode, this pin is not used.

Upstream Plus USB I/O. This pin should be connected to CEXT through an external

1.5 kΩ pull-up resistor. DP0 and DM0 form the differential signal pin pairs connected to

the Host Controller or an upstream Hub.

Upstream Minus USB I/O.

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.

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

resistor

Overcurrent. This is the input signal used to indicate to the AT43312A that an overcur-

rent is detected at the port. If OVCx is asserted, AT43312A will assert the PWRx pin and

report the status to the USB Host.

Power Switch. This is an output signal used to enable or disable the external voltage

regulator supplying power to a port. PWRx is de-asserted when a power supply problem

is detected at OVCx.

Connect Status. This is an output pin indicating that a port is properly connected. STATx

is asserted when the port is enabled.

External Capacitor. For proper operation of the on chip regulator, a 0.27 µF capacitor

must be connected to this pin.

Test. This pin should be connected to a logic high for normal operation.

5V Power Supply.

Ground.

5

1255G–USB–05/06

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