at43312 ATMEL Corporation, at43312 Datasheet
at43312
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at43312 Summary of contents
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... USB connection status indicators Description The AT43312 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’ ...
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... This document assumes that the reader is familiar with the Universal Serial Bus and therefore only describes the unique fea- tures of the AT43312 chip. For detailed information about the USB and its operation, the reader should refer to the Universal Serial Bus Specification Version 1.0, January 19, 1996. ...
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... OVC[1:4] I Overcurrent. This is the input signal used to indicate to the AT43312 that an overcurrent is detected at the port. If OVC is asserted, AT43312 will assert the PWRx pin and report the status to the USB Host. PWR[1:4] OD Power Switch. This is an output signal used to enable or disable the external voltage regulator supplying power to a port ...
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... AT43312 treats overcurrent condi- REF tion. This could be caused by an overload, or even a short ci rcu it, and caus AT43312 the por t’ C_PORT_OVER_CURRENT status change bit. At the same time, power to the offending port is shut off. ...
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... PC board layout is required to meet the specifications. When using a MOSFET switch, its resistance must be 140 M ditions. A suitable MOSFET switch for an AT43312 based hub is a P-channel enhancement mode MOSFET. The input of the PMOS switch is connected to the local 5V power supply while the output is connected to the port power line, as well as the port’ ...
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... GND Hub Controller The Hub Controller of the AT43312 provides the mecha- nism for the Host to enumerate the Hub, and the AT43312 to provide the Host with its configuration information. It also provides a mechanism for the Host to monitor and control the downstream ports. Power is applied per port basis, by the Hub Controller upon receiving a command, Set_Port_Feature[PORT_POWER], from the Host ...
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... Change in status detected Default values Controller will continue to report a status change when polled until that particular change has been removed by a Clear_Port_Feature request from the Host. No status change will be reported by Endpoint1 until the AT43312 has been enumerated and configured by the Host via Endpoint0. 7 ...
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... RC network of 100 lel with capacitor must be connected from the LFT pin provide the best operating condition for the AT43312, careful consideration of the power supply connections are recommended. Use short, low impedance connections to all power supply lines ...
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... The Hub Controller supports the following standard USB descriptors: Device, Configuration, Interface, and Endpoint Descriptors, as well as the class-specific Hub Descriptor. All the obligatory Standard Requests and Hub Class-Spe- Device Descriptor The Device Descriptor provides general information about the AT43312 Hub. Offset Field Description 0 ...
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... Description 7 bmAttributes Configuration characteristics = Bus-Powered with Remote Wakeup 8 MaxPower Maximum power consumption of USB device from bus = 500 mA Interface Descriptor The Interface Descriptor provides information about the single interface which the AT43312 supports. Offset Field Description 0 bLength Define size of this descriptor = 9 bytes 1 ...
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... Transfer Type = Interrupt 4 wMaxPacketSize Max. packet size Endpoint1 is capable of sending = 1 byte 6 bInterval Interval for polling endpoint for data transfers = 256 ms Hub Descriptor This descriptor describes the AT43312’s Hub and ports. Offset Field Definition 0 bDescLength Define size of this descriptor = 9 bytes 1 bDescriptor Type ...
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... For any other values, the Hub will respond with a STALL handshake packet. If the value of byte the AT43312 will be con- figured will go to its unconfigured state. Set_Descriptor Not supported ...
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... Clear_Hub_Feature This request is used by the host to acknowledge local power and hub overcurrent changes. Upon receipt of this request with a wValue = 0, the AT43312 will clear the Local Power Status Change bit. The AT43312 has a per port overcurrent protection and does not report over-current on a global basis ...
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... Bus Powered Mode: Bit Description 0 Local Power Status Change. In the bus-powered configuration, the AT43312 will return this bit is read. Get_Port_Status Returns the current port status and the states that have changed since the previous acknowledgment in the form of two words of data. This is described in the following two tables ...
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Port Status Field, wPortStatus Bit Description 0 Current Connect Status: PORT_CONNECTION device present on this port device is present on this port 1 Port Enabled/Disabled: PORT_ENABLE 0 = Port is disabled 1 = Port ...
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... Set_Hub_Descriptor The AT43312 has one Hub Descriptor only and therefore does not support this request. It will respond with a STALL. Set_Hub_Feature Sets a value reported in the Hub status. The status relates to the local power and over-current. AT43312 does not support this request and will respond with a STALL. ...
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Absolute Maximum Ratings Operating Temperature .................................. -55°C to +125°C Storage Temperature .................................... -65°C to +150°C Voltage on any pin with Respect to Ground ..............................................-1.0V to 7.0V Maximum Operating Voltage............................................. 6.6V DC Output Current......................................................... Characteristics The values shown ...
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... Open loop gain 0 CM Input CM range low IRL CM Input CM range high IRH CM CM rejection ratio RR C Input capacitance, VREF INR C Input capacitance, all other INL AT43312 18 Condition Min 0.47 0.67 6 MHz, fundamental V = 5V, 6 MHz crystal, CC5 120 equiv series resistor Condition Min -20 80 ...
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AC Characteristics Dpx, Dmx Driver Characteristics, Full Speed Operation Symbol Parameter T Rise time R T Fall time F TRFM TR/TF matching V Output signal crossover CRS Z Driver output resistance DRV Note: 1. with external 27 series resistor Dpx, ...
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... Downstr Hub Diff Driver Jitter T To Next Transition LHDJ1 T For Paired Transitions LHDJ2 Data Bit Width Distortion T after SOP SOP Hub EOP Delay Relative T to THDD LEOPD T Hub EOP Output Width Skew LHESK AT43312 20 Condition Min 350 350 ...
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Packaging Information 32R, 32-Lead, 0.440" Wide, Plastic Gull Wing Small Outline (SOIC) Dimensions in Inches and (MIllimeters) 32P6, 32-Lead, 0.600" Wide, Plastic Dual Inline Package (PDIP) Dimensions in Inches and (Millimeters) 1.67(42.4) 1.64(41.7) 1.500(38.10) REF .220(5.59) MAX SEATING PLANE .161(4.09) ...