Atmel AT43301 Manual
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Atmel AT43301 Manual

Low-cost usb hub controller
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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-pin SOIC
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 comes in a 24-pin SOIC package.
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.
Pin Configurations
Top View
VCC
1
VSS
2
CEXT1
3
OSC1
4
OSC2
5
LFT
6
STAT
7
PWR
8
OVC
9
LPSTAT
10
TEST
11
SELF/BUS
12
24
NC
23
DP4
22
DM4
21
DP3
20
DM3
19
DP2
18
DM2
17
DP1
16
DM1
15
DP0
14
DM0
13
VSS
Low-cost USB
Hub Controller
AT43301
Rev. 1137C–08/99
1

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Summary of Contents for Atmel AT43301

  • Page 1 AT43301 is designed for very low-cost bus-powered or self-powered hub applications and comes in a 24-pin SOIC package. 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.

  • Page 2: Block Diagram

    This document assumes that the reader is familiar with the Universal Serial Bus and therefore only describes the unique features of the AT43301 chip. For detailed information about the USB and its operation, the reader should refer to the Universal Serial Bus Specification Version 1.1, September 23, 1998.

  • Page 3: Pin Assignment

    AT43301 Pin Assignment Table 2. Pin Assignment in Alphabetical Order Type: Pin# Signal Type Input IS = Input, Schmitt Trigger CEXT1 Output OD = Output, open drain Bi-directional Power supply, ground Table 1. Pin Assignment in Numerical Order Pin# Signal...

  • Page 4: Functional Description

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

  • Page 5: Power Management

    If a port is enumerated as low speed, its output buffers ing of the ports’ power under control of the AT43301. The operate at a slew rate of 75-300 ns, and the AT43301 will signal to control the external switch is the PWR pin which is...
  • Page 6 The power switch works exactly like the self-powered self-powered mode and bus-powered mode using an inte- mode, except that the allowable switch resistance is higher: grated switch with built-in overcurrent protection. Figure 2. Bus-powered Hub BUS_POWER AT43301 PORT_POWER PORT_POWER DOWNSTREAM PORT_POWER DEVICES...
  • Page 7 Hub Controller The Hub Controller of the AT43301 provides the mecha- The Hub Controller supports two endpoints, Endpoint0 and nism for the host to enumerate the hub and the AT43301 to Endpoint1. provide the host with its configuration information. It also...

  • Page 8: Power Supply

    Controller will continue to report a status change when polled until that particular change has been removed by a ClearPortFeature request from the Host. No status change will be reported by Endpoint 1 until the AT43301 has been 10nF enumerated and configured by the host.

  • Page 9: Electrical Specification

    AT43301 Electrical Specification Absolute Maximum Ratings* Symbol Parameter Condition Unit 5V Power Supply + 0.3 CEXT DC Input Voltage -0.3V 4.6 max + 0.3 CEXT DC Output Voltage -0.3 4.6 max °C Operating Temperature +125 °C Storage Temperature +150 *NOTICE: Stresses beyond those listed under “Absolute Maximum Ratings”...
  • Page 10 AC Characteristics Table 10. DPx, DMx Driver Characteristics, Full Speed Operation Symbol Parameter Condition Unit Rise Time = 50 pF Fall Time = 50 pF Matching Ω Driver Output Resistance Steady state drive Note: 1. With external 22Ω series resistor. AT43301...
  • Page 11 AT43301 Table 11. DPx, DMx Source Timings, Full Speed Operation Symbol Parameter Condition Unit Full Speed Data Rate Average bit rate 11.97 12.03 Mb/s DRATE Frame Interval 0.9995 1.0005 FRAME Consecutive Frame Interval Jitter No clock adjustment 42.0 Consecutive Frame Interval Jitter With clock adjustment 126.0...
  • Page 12 Only for a SetPortFeature 10.0 20.0 DRST (PORT_RESET) request µ Time to Detect a Long K from Upstream 100.0 URLK µ Time to Detect a Long SEO from Upstream 10000.0 URLSEO Duration of repeating SEO Upstream FS bit URPSEO time AT43301...

  • Page 13: Timing Waveforms

    AT43301 Timing Waveforms Figure 5. Data Signal Rise and Fall Time RISE TIME FALL TIME DIFFERENTIAL DATA LINES Figure 6. Full-Speed Load TxD+ TxD- = 50pF Figure 7. Low-speed Downstream Port Load TxD+ 3.6V 1.5KΩ TxD- = 200pF to 600pF Figure 8.
  • Page 14 HDD1 HDD2 A. DOWNSTREAM HUB DELAY WITH CABLE B. UPSTREAM HUB DELAY WITHOUT CABLE CROSSOVER DOWNSTREAM POINT PORT UPSTREAM HUB DELAY CROSSOVER PORT OR END UPSTREAM POINT OF CABLE HDD1, HDD2 C. UPSTREAM HUB DELAY WITH OR WITHOUT CABLE AT43301...
  • Page 15 AT43301 Hub Differential Jitter: (J) - T (K) or T (K) - T (J) Consecutive Transitions HDJ1 HDDX HDDX HDDX HDDX (J) - T (J) or T (K) - T (K) Paired Transitions HDJ2 HDDX HDDX HDDX HDDX Bit After Sop Width Distortion (Same as Data Jitter for Sop and Next J Transition):...
  • Page 16 VBUS VBUS 1N4148 R7 22 CEXT 4.7UF R8 22 R9 22 0.27UF LPSTAT 1.5K R10 22 R11 22 AT43301 USB-B R12 22 R13 22 TEST L11 FB R14 22 2.2nF 0.01UF 6.000MHz...
  • Page 17 VBUS L2 FB VBUS L12 FB USB-2A MIC2525-2 47uF L13 FB 47uF 0.1uF 0.1uF L5 FB L14 FB USB-2A 47uF L15 FB 47uF 0.1uF 0.1uF...
  • Page 18 VBUS VLOCAL 2N4401 CEXT R8 22 0.27UF R9 22 LPSTAT 1.5K R10 22 AT43301 R11 22 USB-B R12 22 R13 22 TEST L11 FB R14 22 2.2nF 0.01UF 6.000MHz...
  • Page 19 VLOCAL 0.1 UF 4.7 UF CON2 L2 FB GATE L12 FB USB-2A MIC2505-2 100 UF L13 FB 100 UF 0.1uF 0.1uF L5 FB L14 FB USB-2A 100 UF L15 FB 100 UF 0.1uF 0.1uF...

  • Page 20: Packaging Information

    24S, 24-lead, 0.300" Wide Plastic Gull Wing Small Outline Package (SOIC) Dimensions in Inches and (Millimeters) .020(.508) .013(.330) .299(7.60) .420(10.7) .291(7.39) .393(9.98) PIN 1 ID .050(1.27) BSC .616(15.6) .105(2.67) .598(15.2) .092(2.34) .012(.305) .003(.076) .013(.330) .009(.229) .050(1.27) 0 REF .015(.381) AT43301...
  • Page 21 No licenses to patents or other intellectual prop- erty of Atmel are granted by the Company in connection with the sale of Atmel products, expressly or by implication. Atmel’s products are not authorized for use as critical components in life support devices or systems.

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