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ADM1029 Fiches technique(PDF) 7 Page - ON Semiconductor |
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ADM1029 Fiches technique(HTML) 7 Page - ON Semiconductor |
7 / 50 page Rev. 1 | Page 7 of 50 | www.onsemi.com TEMPERATURE – C 0.05 0.00 –0.05 –0.10 –0.15 –0.20 –0.25 –0.30 –0.35 –0.40 –0.45 –0.50 –0.55 –0.60 0 20 40 60 80 85 100 105 120 TPC 13. Local Temperature Error PRODUCT DESCRIPTION The ADM1029 is a versatile fan controller and monitor for use in personal computers, servers, telecommunications equipment, or any high-availability system where reliable control and moni- toring of multiple cooling fans is required. Each ADM1029 can control the speed of one or two fans and can measure the speed of fans that have a tachometer output. The ADM1029 can also measure the temperature of one or two external sensing diodes or an internal temperature sensor, allowing fan speed to be adjusted to keep system temperature within acceptable limits. The ADM1029 has FAULT inputs for use with fans that can signal failure conditions, and inputs to detect whether or not fans are connected. The ADM1029 communicates with the host processor over an System Management (SMBus) serial bus. It supports eight different serial bus addresses, so that up to eight devices can be connected to a common bus, controlling up to sixteen fans. This makes software support and hardware design scalable. The ADM1029 has an interrupt output (INT) that allows it to signal fault conditions to the host processor. It also has a separate, cascadable fault output (CFAULT) that allows the ADM1029 to signal a fault condition to other ADM1029s. The ADM1029 has a number of useful features including an automatic fan speed control option implemented in hardware with no software requirement, automatic use of backup fans in the event of fan failure, and supports hot-swapping of failed fans. FUNCTIONAL DESCRIPTION SERIAL BUS INTERFACE Control of the ADM1029 is carried out via the serial bus. The ADM1029 is connected to this bus as a slave device, under the control of a master device. The ADM1029 has a 7-bit serial bus address. The four MSBs of the address are set to 0101. The three LSBs can be set by the user to give a total of eight different addresses, allowing up to eight ADM1029s to be connected to a single serial bus segment. To minimize device pin count and size, the three LSBs are set using a single pin (ADD, Pin 15). This is an 8-level input whose input voltage is set by a potential divider. The voltage on ADD is sampled immediately after power-up and digitized by the on-chip ADC to determine the value of the 3 LSBs. Since ADD is sampled only at power-up, any changes made while power is on will have no effect. ADM1029 ADD VCC GND R1 R2 Figure 2. Setting the Serial Address Table I shows resistor values for setting the 3 LSBs of the serial bus address. The same principle is used to set the voltage on Pin 18 (TMIN/INSTALL), which controls the automatic fan speed control function, and also tells the ADM1029 how many fans should be installed, as described later. If several ADM1029s are used in a system, their ADD inputs can tap off a single potential divider, as shown in Figure 3. ADD ADD ADD ADD ADD ADD ADD ADD ADDRESS XXXX000 ADDRESS XXXX001 ADDRESS XXXX111 ADDRESS XXXX110 ADDRESS XXXX101 ADDRESS XXXX100 ADDRESS XXXX011 ADDRESS XXXX010 VCC GND 1.5k 1k 1k 1k 1k 1k 1.5k ADM1029 #1 ADM1029 #2 ADM1029 #3 ADM1029 #4 ADM1029 #5 ADM1029 #6 ADM1029 #7 ADM1029 #8 Figure 3. Setting Address of up to Eight ADM1029s ADM1029 |
Numéro de pièce similaire - ADM1029 |
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Description similaire - ADM1029 |
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