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ADM1034 Scheda tecnica(PDF) 10 Page - Analog Devices |
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ADM1034 Scheda tecnica(HTML) 10 Page - Analog Devices |
10 / 40 page ADM1034 Rev. 0 | Page 10 of 40 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 4 gives a brief description of the ADM1034’s principal internal registers. For more detailed information on the function of each register, refer to Table 34. 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 power-up. 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 power-up. 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 power-up and digitized by the on-chip ADC to determine the LOCATION input value. Because the LOCATION input is sampled only at power-up, changes made while power is applied have no effect. VCC GND ADM1034 R1 R2 LOCATION PIN 13 Figure 16. Bootstrapping the LOCATION Input 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. VCC 1.5k Ω 1k Ω 1k Ω 1k Ω 1k Ω 1k Ω 1.5k Ω GND ADM1034 NO. 1 ADM1034 NO. 2 ADM1034 NO. 3 ADM1034 NO. 5 ADM1034 NO. 7 ARP LOCATION = 111 ARP LOCATION = 110 ADM1034 NO. 4 ARP LOCATION = 101 ARP LOCATION = 100 ADM1034 NO. 6 FD ADDRESS = 53h FD ADDRESS = 52h ADM1034 NO. 8 FD ADDRESS = 51h FD ADDRESS = 50h Figure 17. Setting Up Multiple ADM1034 Addresses in SMBus 2.0 ARP-Capable Mode In SMBus 2.0 mode, this vendor-specific ID is generated by an on-chip random number generator. This should enable two adjacent ADM1034s in the same system to power up with a different vendor-specific ID, allowing the master to identify the two separate ADM1034s and assign a different address to each. The state of the LOCATION input on power-up is also reflected in the UDID. This is useful when there is more than one ADM1034 in the system, so the master knows which one it is communicating with. The complete UDID is listed in Table 6. The SMBus 2.0 master issues both general and directed ARP commands. A general command is directed at all ARP devices. A directed command is targeted at a single device once an address has been established. The PEC byte must be used for ARP commands. (Refer to the Packet Error Checking (PEC) section.) The ADM1034 responds to the following commands: • Prepare to ARP (general) • Reset device (general and directed) • Get UDID (general and directed) • Assign address (general) |
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