AT43312 View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT43312

Self- and Bus Powered USB Hub Controller

Atmel Corporation 

Features

• Full compliance with USB spec Rev 1.0

• Four downstream ports

• Full speed and low speed data transfers

• Self-Powered or Bus-Powered modes of operation

• Per port overcurrent monitoring

• Individual port power switch control

• USB connection status indicators

Description

The AT43312 is a 5 port USB hub chip supporting one upstream and four downstream

ports. The AT43312 connects to an upstream hub or Host/Root Hub via Port0 and the

other ports connect to external downstream USB devices. The hub re-transmits the

USB differential signal between Port0 and Ports[1:4] in both directions. A USB hub

with the AT43312 can operate as a bus-powered or self-powered through chip’s

power mode configuration pin. The AT43312 is pin- and function-compatible with the

AT43311 and can be used as a replacement for the AT43310 with one pin modifica-

tion.

The AT43312 supports the 12 Mb/s full-speed as well as 1.5 Mb/s slow-speed USB

transactions. To reduce EMI, the AT43312’s oscillator frequency is 6 MHz even

though some internal circuitry operates at 48 MHz.

Self- and Bus-

Powered USB

Hub Controller

AT43312

Pin Configurations

SOIC/DIP

PWR2 1

PWR3 2

PWR4 3

VCC5 4

GND 5

OSC1 6

OSC2 7

LFT 8

VCCA 9

OVL4 10

OVL3 11

OVL2 12

OVL1 13

VREF 14

BUS/SELF 15

STAT4 16

32 PWR1

31 DP4

30 DM4

29 DP3

28 DM3

27 GND

26 DP2

25 DM2

24 VCC3

23 DP1

22 DM1

21 DP0

20 DM0

19 STAT1

18 STAT2

17 STAT3

Rev. 1002A-A–01/98

1

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