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ADM1027 датащи(PDF) 6 Page - ON Semiconductor |
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ADM1027 датащи(HTML) 6 Page - ON Semiconductor |
6 / 56 page REV. A –6– ADM1027 FUNCTIONAL DESCRIPTION General Description The ADM1027 is a complete systems monitor and multiple fan controller for any system requiring monitoring and cooling. The device communicates with the system via a serial system management bus. The serial bus controller has an optional address line for device selection (Pin 14), a serial data line for reading and writing addresses and data (Pin 1), and an input line for the serial clock (Pin 2). All control and programming functions of the ADM1027 are performed over the serial bus. In addition, one of the pins can be reconfigured as an SMBALERT output to indicate out-of-limit conditions. Measurement Inputs The device has six measurement inputs, four for voltage and two for temperature. It can also measure its own supply voltage and can measure ambient temperature with its on-chip tempera- ture sensor. Pins 20 to 23 are analog inputs with on-chip attenuators, configured to monitor 5 V, 12 V, 2.5 V, and the processor core voltage (2.25 V input), respectively. Power is supplied to the chip via Pin 4, which the system also uses to monitor VCC. In PCs, this pin is normally connected to a 3.3 V standby supply. This pin can, however, be connected to a 5 V supply and monitor it without overranging. Remote temperature sensing is provided by the D1+/– and D2+/– inputs, to which diode-connected, external temperature- sensing transistors such as a 2N3906 or CPU thermal diode may be connected. The ADC also accepts input from an on-chip band gap tem- perature sensor that monitors system ambient temperature. Sequential Measurement When the ADM1027 monitoring sequence is started, it cycles sequentially through the measurement of analog inputs and the temperature sensors. Measured values from these inputs are stored in value registers. These can be read out over the serial bus, or can be compared with programmed limits stored in the limit registers. The results of out-of-limit comparisons are stored in the status registers, which can be read over the serial bus to flag out-of-limit conditions. Processor Voltage ID Five digital inputs (VID0 to VID4 — Pins 5 to 8 and 19) read the processor Voltage ID code and store it in the VID register, from which it can be read out by the management system over the serial bus. The VID code monitoring function is compatible with both VRM9.x and future VRM10 solutions. The VID code monitoring function is compatible with VRM9.x. ADM1027 Address Selection Pin 13 is the dual function PWM3/ADDRESS ENABLE pin. If Pin 13 is pulled low on power-up, the ADM1027 will read the state of Pin 14 (TACH4/ADDRESS SELECT pin) to determine the ADM1027 slave address. If Pin 13 is high on power-up, then the ADM1027 will default to SMBus slave address 0x5C. This function is described later in more detail. Internal Registers of the ADM1027 A brief description of the ADM1027’s principal internal regis- ters follows. More detailed information on the function of each register is given in Tables IV to XXXVI. Configuration Registers Provide control and configuration of the ADM1027, including alternate pinout functionality. Address Pointer Register Contains the address that selects one of the other internal registers. When writing to the ADM1027, the first byte of data is always a register address, which is written to the Address Pointer Register. Status Registers Provide the status of each limit comparison and are used to signal out-of-limit conditions on the temperature, voltage, or fan speed channels. If Pin 10 is configured as SMBALERT, then this pin will assert low whenever a status bit gets set. Interrupt Mask Registers Allow each interrupt status event to be masked when Pin 10 is configured as an SMBALERT output. This affects only the SMBALERT output and not the bits in the status register. VID Register The status of the VID0 to VID4 pins of the processor can be read from this register. Value and Limit Registers The results of analog voltage inputs, temperature, and fan speed measurements are stored in these registers, along with their limit values. Offset Registers Allow each temperature channel reading to be offset by a twos complement value written to these registers. TMIN Registers Program the starting temperature for each fan under automatic fan speed control. TRANGE Registers Program the temperature-to-fan speed control slope in automatic Fan Speed Control Mode for each PWM output. Enhance Acoustics Registers Allow each PWM output controlling fan to be tweaked to enhance the system’s acoustics. Rev. 3 | Page 6 of 56 | www.onsemi.com |
Аналогичный номер детали - ADM1027 |
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Аналогичное описание - ADM1027 |
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