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DS2490S+TR Datasheet(PDF) 2 Page - Maxim Integrated Products |
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DS2490S+TR Datasheet(HTML) 2 Page - Maxim Integrated Products |
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2 / 50 page  DS2490 2 of 50 SIGNAL SUMMARY Table 1 SIGNAL NAME TYPE FUNCTION VD PWR Power supply input for digital and 1-Wire functions. Range: 5.0 10% VD2 PWR Second VD supply, must be tied to VD externally to the IC (the two pins are not tied together inside the package). VB PWR Power supply input for USB functions. Range: 3.3V 10% supply regulated from USB supplied VBUS. D+ I/O USB data—non-inverted of differential data pair. D- I/O USB data—inverted signal of differential data pair. 1-Wire I/O 1-Wire input/output. PMOD I Reserved for future use. Must be tied to GND. SUSO O Suspend Output—buffered USB suspend-state output from USB device controller. When HIGH the USB is in an active non-suspended state, when LOW the USB has entered a suspended state. This is an open drain output and requires an external pullup. XI I Crystal input. Use a 12.0 MHz, fundamental-mode, parallel-resonant crystal. A 12.0MHz CMOS clock source may also be used. XO O Crystal output. Connect to other side of crystal 1 if used. GND PWR Ground reference and ground return for 1-Wire bus. NC No connect. For factory use or reserved, do not connect to these pins. RELATED DOCUMENTS This specification uses terms from and references or complies with the Universal Serial Bus Specification v1.1, which may be obtained from the USB Implementers Forum website: www.usb.org. The USB specification is considered to be part of the DS2490 specification. DOCUMENT ORGANIZATION The remainder of this document is organized into the following major sections: SECTION SUMMARY OVERVIEW Device functional summary and application examples 1-WIRE I/F CONTROLLER Edge control and timing diagrams of 1-Wire signals USB COMMUNICATION Configuration model, core and vendor-specific command summaries MODE COMMANDS Commands used to configure 1-Wire interface operational characteristics CONTROL COMMANDS Commands used to control 1-Wire communication command processing COMMUNICATION COMMANDS Commands used to communicate with an attached 1-Wire device DEVICE FEEDBACK Technique to obtain device status information USB TRANSCEIVER Transceiver connection requirements OSCILLATOR Oscillator connection requirements SUSPEND OUTPUT SUSO signal operation and purpose |
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