AT43301_05 Datasheet, PDF (1/27 Pages) ATMEL Corporation – Low-cost USB Hub Controller

Features
• Full Compliance with USB Spec Rev 1.1
• Four Downstream Ports
• Full-speed and Low-speed Data Transfers
• Bus-powered Controller
• Bus-powered or Self-powered Hub Operation
• Port Overcurrent Monitoring
• Port Power Switching
• 5V Operation with On-chip 3.3V Regulator
• 24-lead SOIC and 32-lead LQFP
1. Description
The AT43301 is a 5-port USB hub chip supporting one upstream and four down-
stream ports. The AT43301 connects to an upstream hub or host/root hub via Port0,
while the other ports connect to external downstream USB devices. The hub re-trans-
mits the USB differential signal between Port0 and Ports[1:4] in both directions. The
AT43301 is designed for very low-cost bus-powered or self-powered hub applications
and is available in a 24-lead SOIC and a 32-lead LQFP packages. The 32-lead ver-
sion of the AT43301, the AT43301-AC, has a 48 MHz clock input.
The AT43301 supports the 12 Mb/s full speed as well as 1.5 Mb/s slow speed USB
transactions. To reduce EMI, the AT43301’s oscillator frequency is 6 MHz even
though some internal circuitry operates at 48 MHz.
Low-cost USB
Hub Controller
AT43301
Figure 1-1. Pin Configurations
24-lead SOIC Top View
VCC
VSS
CEXT1
OSC1
OSC2
LFT
STAT
PWR
OVC
LPSTAT
TEST
SELF/BUS
AT43301-SC
1
24
2
23
3
22
4
21
5
20
6
19
7
18
8
17
9
16
10
15
11
14
12
13
NC
DP4
DM4
DP3
DM3
DP2
DM2
DP1
DM1
DP0
DM0
VSS
32-lead LQFP Top View
NC 1
DM4 2
DP4 3
48 4
VCC 5
VSS 6
CEXT1 7
NC 8
AT43301-AC
24 NC
23 DP0
22 DM0
21 VSS
20 NC
19 SELF/BUS
18 TEST
17 LPSTAT
1137J–USB–01/06