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9 / 39 page  ADM1034 http://onsemi.com 9 Figure 16. Setting Up Multiple ADM1034 Addresses in SMBus 2.0 ARP−Capable Mode VCC 1.5kΩ 1kΩ 1kΩ 1kΩ 1kΩ 1kΩ 1.5kΩ GND ADM1034 1 ADM1034 2 ADM1034 3 ADM1034 5 ADM1034 7 ARP LOCATION = 111 ARP LOCATION = 110 ADM1034 4 ARP LOCATION = 101 ARP LOCATION = 100 ADM1034 6 FD ADDRESS = 53h FD ADDRESS = 52h ADM1034 8 FD ADDRESS = 51h 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 ADM1034s in the same system to powerup with a different vendor specific ID, allowing the master to identify the two separate ADM1034’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 ADM1034 in the system, so the master knows which one it is communicating with. The complete UDID is listed in Table 3. 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) Table 1. Internal Register Descriptions Register Description Configuration Provides control and configuration of various functions on the device. Conversion Rate Determines the number of measurements per second completed by the ADM1034. Address Pointer Contains the address that selects one of the other internal registers. When writing to the ADM1034, the first byte of data is always a register address, written to the address pointer register. Status Provides the status of each limit comparison. Interrupt Mask Allows the option to mask ALERTs due to particular out−of−limit conditions. Value and Limit Stores the results of temperature and fan speed measurements, along with their limit values. Offset Allows the local and remote temperature channel readings to be offset by a twos complement value written to them. These values are automatically added to the temperature values (or subtracted from them if negative). This allows the systems designer to optimize the system if required, by adding or subtracting up to 15.875°C from a temperature reading. THERM Limit and Hysteresis Contains the temperature value at which THERM is asserted and indicates the level of hysteresis. Look−Up Table Used to program the look−up table for the fan speed−to−temperature profile. THERM % On−time and THERM % Limit Reflects the state of the THERM input and monitors the duration of the assertion time of the signal as a percentage of a time window. The user can program the length of the time window. Table 2. Resistor Ratios for Setting LOCATION Bits Ideal Ratio R2/(R1 + R2) R1 kW R2 W Actual R2/(R1 + R2) Error % SMBus Ver (Note 1) SMBus Address UDID LLL N/A 0 O/C 1 0 ARP N/A 111 0.8125 18 82 0.82 +0.75 ARP N/A 110 0.6875 22 47 0.6812 −0.63 ARP N/A 101 0.5625 12 15 0.5556 −0.69 ARP N/A 100 0.4375 15 12 0.4444 +0.69 FD 0x53 N/A 0.3125 47 22 0.3188 +0.63 FD 0x52 N/A 0.1875 82 18 0.18 −0.75 FD 0x51 N/A N/A O/C 0 0 0 FD 0x50 N/A 1. ARP denotes ARP−capable mode, FD denotes fixed and discoverable mode. |
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