AT43312A-AC
AT43312A-AC Datasheet
The AT43312A is a 5 port USB hub chip supporting one upstream and four downstream ports. The AT43312A 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 AT43312A can operate as a bus-powered or self-powered through chip’s power mode configuration pin. In the self-powered mode, port power can be switched or unswitched. Overcurrent reporting and port power control can be individual or global. An on-chip power supply eliminates the need for an external 3.3V supply.
| Part | Datasheet |
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AT43312A-AC |
AT43312A-AC (pdf) |
| Related Parts | Information |
|---|---|
AT43312A-SC |
AT43312A-SC |
| PDF Datasheet Preview |
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| Overview Introduction The AT43312A is a 5 port USB hub chip supporting one upstream and four downstream ports. The AT43312A 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 AT43312A can operate as a bus-powered or self-powered through chip’s power mode configuration pin. In the self-powered mode, port power can be switched or unswitched. Overcurrent reporting and port power control can be individual or global. An on-chip power supply eliminates the need for an external 3.3V supply. The AT43312A supports the 12-Mb/sec full speed as well as 1.5-Mb/sec slow speed USB transactions. To reduce EMI, the AT43312A’s oscillator frequency is 6 MHz even though some internal circuitry operates at 48 MHz. The AT43312A consists of a Serial Interface Engine, a Hub Repeater, and a Hub Controller. Self- and Buspowered USB Hub Controller AT43312A SOIC PWR2 1 PWR3 2 PWR4 3 VCC5 4 VSS 5 OSC1 6 OSC2 7 LFT 8 TEST 9 OVC4 10 OVC3 11 OVC2 12 OVC1 13 LPSTAT 14 SELF/BUS 15 STAT4 16 32 PWR1 31 DP4 30 DM4 29 DP3 28 DM3 27 VSS 26 DP2 25 DM2 24 CEXT 23 DP1 22 DM1 21 DP0 20 DM0 19 STAT1 18 STAT2 17 STAT3 LQFP Top View 32 DM3 31 VSS 30 DP2 29 DM2 28 CEXT 27 DP1 26 DM1 25 DP0 DP3 1 DM4 2 DP4 3 PWR1 4 PWR2 5 PWR3 6 PWR4 7 VCC5 8 24 DMO 23 STAT1 22 STAT2 21 STAT3 20 STAT4 19 SELF/BUS 18 LPSTAT 17 OVC1 VSS 9 OSC1 10 OSC2 11 LFT 12 TEST 13 OVC4 14 OVC3 15 OVC2 16 The Serial Interface Engine’s Tasks are: • Manage the USB communication protocol • USB signaling detection/generation • Clock/Data separation, data encoding/decoding, CRC generation/checking • Data serialization/de-serialization The Hub Repeater is Responsible for: • Providing upstream connectivity between the selected device and the Host • Managing connectivity setup and tear-down • Handling bus fault detection and recovery • Detecting connect/disconnect on each port The Hub Controller is Responsible for: • Hub enumeration • Providing configuration information to the Host • Providing status of each port to the Host • Controlling each port per Host command Figure Block Diagram UPSTREAM PORT 0 HUB CONTROLLER SERIAL INTERFACE ENGINE HUB REPEATER ENDPOINT 0 ENDPOINT 1 PORT 1 PORT 2 PORT 3 PORT 4 TO DOWNSTREAM DEVICES Note: This document assumes that the reader is familiar with the Universal Serial Bus and therefore only describes the unique features of the AT43312A chip. For detailed information about the USB and its operation, the reader should refer to the Universal Serial Bus Specification Version September 23, 2 AT43312A Pin Assignment Type I = Input O = Output Ordering Information Ordering Code AT43312A-AC AT43312A-SC Package 32AA 32R Operating Range Commercial 0°C to 70°C 32AA 32R Package Type 32-lead, Low-profile mm Plastic Quad Flat Package LQFP 32-lead, Wide, Plastic Gull Wing Small Outline SOIC 24 AT43312A Package Information 32AA LQFP AT43312A PIN 1 e PIN 1 IDENTIFIER B E1 E A1 A2 L This package conforms to JEDEC reference MS-026, Variation BBA. Dimensions D1 and E1 do not include mold protrusion. Allowable protrusion is mm per side. Dimensions D1 and E1 are maximum plastic body size dimensions including mold mismatch. Lead coplanarity is mm maximum. COMMON DIMENSIONS Unit of Measure = mm SYMBOL MIN NOTE Note 2 Note 2 2325 Orchard Parkway R San Jose, CA 95131 32AA, 32-lead, 7 x 7 mm Body Size, mm Body Thickness, mm Lead Pitch, Low Profile Plastic Quad Flat Package LQFP 32AA 32R SOIC PIN 1 e 0º ~ 8º Note Dimensions D and E do not include mold Flash or protrusion. Mold Flash or protrusion shall not exceed mm COMMON DIMENSIONS Unit of Measure = mm SYMBOL MIN NOM MAX NOTE Note 1 Note 1 TITLE 2325 Orchard Parkway 32R, 32-lead, Body Width, R San Jose, CA 95131 Plastic Gull Wing Small Outline SOIC 26 AT43312A Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131, USA Tel 1 408 441-0311 Fax 1 408 487-2600 Regional Headquarters Europe Atmel Sarl Route des Arsenaux 41 Case Postale 80 CH-1705 Fribourg Switzerland Tel 41 26-426-5555 Fax 41 26-426-5500 Asia Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimshatsui East Kowloon Hong Kong Tel 852 2721-9778 Fax 852 2722-1369 Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan Tel 81 3-3523-3551 Fax 81 3-3523-7581 Atmel Operations Memory 2325 Orchard Parkway San Jose, CA 95131, USA Tel 1 408 441-0311 Fax 1 408 436-4314 |
| More datasheets: 74F827SCX | GPF14.1W | 1860 | 26200A-402 | S5U13706P00C000 | S1D13706F00A200 | 84855104 | EPC9058 | 2993 | AT43312A-SC |
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