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MAX3421EETJ+ Datasheet(PDF) 3 Page - Maxim Integrated Products |
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MAX3421EETJ+ Datasheet(HTML) 3 Page - Maxim Integrated Products |
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3 / 28 page  MAX3421E USB Peripheral/Host Controller with SPI Interface 3 Maxim Integrated 3.3V REGULATOR POWER RAIL ASIC, DSP, ETC. SPI 3, 4 INT MAX3421E USB Figure 2. The MAX3421E Connected to a Large Chip 3.3V REGULATOR MISO LOCAL GND LOCAL POWER INT MAX3421E SCLK MOSI SS MICRO ASIC DSP I S O L A T O R S USB Figure 3. Optical Isolation of USB Using the MAX3421E MICRO, ASIC, DSP USB PERIPHERAL USB "A" USB "B" VBUS SWITCH FAULT 5V SPI 3, 4 INT VBUS D+ D- GND VBUS POWER ON/OFF 3.3V REGULATOR MAX3421E Figure 4. The MAX3421E in an Embedded Host Application Two MAX3421E features make it easy to connect to large, fast chips such as ASICs and DSPs (Figure 2). First, the SPI interface can be clocked up to 26MHz. Second, the VL pin and internal level translators allow running the system interface at a lower voltage than the 3.3V required for VCC. The MAX3421E provides an ideal method for electrically isolating a USB interface (Figure 3). USB employs flow control in which the MAX3421E automatically answers host requests with a NAK handshake, until the micro- processor completes its data-transfer operations over the SPI port. This means that the SPI interface can run at any frequency up to 26MHz. Therefore, the designer is free to choose the interface operating frequency and to make opto-isolator choices optimized for cost or per- formance. Figure 4 shows a block diagram for a system in which the MAX3421E operates as a USB host. A USB host supplies 5V power to the VBUS pin of the USB “A” con- nector to power USB peripherals. A system that pro- vides power to an external peripheral should use protection circuitry on the power pin to prevent an external overcurrent situation from damaging the sys- tem. A VBUS switch, such as the MAX4789, provides power control plus two additional features: it limits the current delivered to the peripheral (for example to 200mA), and it indicates a fault (overcurrent) condition to the SPI controller. Maxim offers a variety of VBUS switches with various current limits and features. Consult the Maxim website for details. A 3.3V regulator (for example, the MAX6349TL) powers the MAX3421E, and optionally the system controller. If the system controller operates with a lower voltage, the MAX3421E SPI and I/O interface can run at the lower voltage by connecting the system voltage (for exam- ple, 2.5V or 1.8V) to the MAX3421E VL pin. Typical Application Circuits (continued) |
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