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ADM1034 Scheda tecnica(PDF) 8 Page - ON Semiconductor |
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ADM1034 Scheda tecnica(HTML) 8 Page - ON Semiconductor |
8 / 39 page ADM1034 http://onsemi.com 8 TYPICAL CHARACTERISTICS Figure 13. Supply Current vs. Conversion Rate Figure 14. Supply Current vs. ADM1034 Temperature CONVERSION RATE (Hz) 1200 1000 800 600 400 200 0 0.01 0.1 1 100 10 DEV 33 DEV 32 DEV 31 TEMPERATURE (°C) 1.55 1.50 1.45 1.40 1.35 1.30 1.25 –60 –40 –20 0 100 40 60 80 20 Functional Description The ADM1034 is a local− and remote−temperature monitor and fan controller for use in a variety of applications, including microprocessor−based systems. The device accurately monitors remote and ambient temperature and uses that information to quietly control the speed of a cooling fan. Whenever one of the fans stalls, the device asserts a FAN_FAULT output. The ADM1034 features a THERM I/O. As an input, this measures assertions on the THERM pin. As an output, it asserts a low signal to indicate when the measured temperature exceeds the programmed THERM temperature. The ADM1034 communicates over an SMBus 2.0 interface. Its LOCATION input determines which version of SMBus to use, as well as the SMBus address (in fixed and discoverable mode) and the LOCATION bits in the UDID (in ARP−capable mode). Internal Registers Table 1 gives a brief description of the ADM1034’s principal internal registers. For more detailed information on the function of each register, refer to Table 31. Serial Bus Interface The ADM1034 communicates with the master via the 2−wire SMBus 2.0 interface. It supports two versions of SMBus 2.0, determined by the value of the LOCATION input’s resistors. The first version is fully ARP−capable. This means that it supports address resolution protocol (ARP), allowing the master to dynamically address the device on powerup. It responds to ARP commands such as “Prepare to ARP.” The second SMBus version, fixed and discoverable, is backwards compatible with SMBus 1.0 and 1.1. In this mode, the ADM1034 powers up with a fixed address, which is determined by the state of the LOCATION pin on powerup. NOTE: When using the ADM1034, Addresses 0xC2 and 0xCA should not be used by any other device on the bus. Location Input The LOCATION input is a resistor divider input. It has multiple functions and can specify the SMBus version (in fixed and discoverable or ARP−capable modes); the SMBus address (in fixed and discoverable mode); and the LLL bits (in UDID in ARP−capable mode). The voltage of this 8−level input is set by a potential divider. The voltage on LOCATION is sampled on powerup and digitized by the on−chip ADC to determine the LOCATION input value. Because the LOCATION input is sampled only at powerup, changes made while power is applied have no effect. Figure 15. Bootstrapping the LOCATION Input VCC GND ADM1034 R1 R2 LOCATION PIN 13 SMBus 2.0 ARP−Capable Mode In ARP−capable mode, the ADM1034 supports features such as address resolution protocol (ARP) and unique device identifier (UDID). The UDID is a 128−bit message that describes the ADM1034’s capabilities to the master. The UDID also includes a vendor specific ID for functionally equivalent devices. |
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