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ADM1033 Folha de dados(PDF) 8 Page - ON Semiconductor |
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ADM1033 Folha de dados(HTML) 8 Page - ON Semiconductor |
8 / 35 page ADM1033 http://onsemi.com 8 Functional Description The ADM1033 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 a fan stalls, the device asserts a FAN_FAULT output. The ADM1033 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 ADM1033 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 5 gives a brief description of the ADM1033’s principal internal registers. For more detailed information on the function of each register, refer to Table 35. Serial Bus Interface The ADM1033 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 ADM1033 powers up with a fixed address, which is determined by the state of the LOCATION pin on powerup. NOTE: When using the ADM1033, 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). Figure 15. Bootstrapping the LOCATION Input ADM1033 PIN 13 VCC GND R1 R2 LOCATION 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. SMBus 2.0 ARP-Capable Mode In ARP-capable mode, the ADM1033 supports features such as address resolution protocol (ARP) and unique device identifier (UDID). The UDID is a 128-bit message that describes the ADM1033’s capabilities to the master. The UDID also includes a vendor specific ID for functionally equivalent devices. Figure 16. Setting Up Multiple ADM1033 Addresses in SMBus 2.0 ARP-capable Mode ADM1033 1 VCC GND ARP LOCATION = 111 1.5 kW ADM1033 2 ADM1033 3 ADM1033 4 ADM1033 5 ADM1033 6 ADM1033 7 ADM1033 8 ARP LOCATION = 110 1 kW ARP LOCATION = 101 1 kW ARP LOCATION = 100 1 kW FD ADDRESS = 53h 1 kW FD ADDRESS = 52h 1 kW FD ADDRESS = 51h 1.5 kW FD ADDRESS = 50h In SMBus 2.0 mode, this vendor specific ID is generated by an on-chip random number generator. This should enable two adjacent ADM1033s in the same system to powerup with a different vendor specific ID, allowing the master to identify the two separate ADM1033’s and assign a different address to each. The state of the LOCATION input on powerup is also reflected in the UDID. This is useful when there is more than one ADM1033 in the system, so the master knows which one it is communicating with. The complete UDID is listed in Table 7. 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.) |
Nº de peça semelhante - ADM1033_12 |
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Descrição semelhante - ADM1033_12 |
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