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ADM1026JST-REEL bảng dữ liệu(PDF) 10 Page - Analog Devices |
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ADM1026JST-REEL bảng dữ liệu(HTML) 10 Page - Analog Devices |
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10 / 56 page  ADM1026 Rev. A | Page 10 of 56 PRODUCT DESCRIPTION The ADM1026 is a complete system hardware monitor for microprocessor-based systems, providing measurement and limit comparison of various system parameters. The ADM1026 has up to 19 analog measurement channels. Fifteen analog voltage inputs are provided, five of which are dedicated to monitoring +3.3 V, +5 V, and ±12 V power supplies, and the processor core voltage. The ADM1026 can monitor two other power supply voltages by measuring its own VCC and the main system supply. One input (two pins) is dedicated to a remote temperature-sensing diode. Two additional pins can be configured as general-purpose analog inputs to measure 0 V to 2.5 V, or as a second temperature sensing input. The eight remaining inputs are general-purpose analog inputs with a range of 0 V to 2.5 V or 0 V to 3 V. The ADM1026 also has an on-chip temperature sensor. The ADM1026 has eight pins that can be configured for fan speed measurement or as general-purpose logic I/O pins. Another eight pins are dedicated to general-purpose logic I/O. An additional pin can be configured as a general-purpose I/O or as the bidirectional THERM pin. Measured values can be read out via a 2-wire serial system management bus, and values for limit comparisons can be programmed over the same serial bus. The high speed, successive approximation ADC allows frequent sampling of all analog channels to ensure a fast interrupt response to any out- of-limit measurement. FUNCTIONAL DESCRIPTION The ADM1026 is a complete system hardware monitor for microprocessor-based systems. The device communicates with the system via a serial system management bus. The serial bus controller has a hardwired address line for device selection (ADD, Pin 15), a serial data line for reading and writing addresses and data (SDA, Pin 14), and an input line for the serial clock (SCL, Pin 13). All control and programming functions of the ADM1026 are performed over the serial bus. Measurement Inputs Programmability of the analog and digital measurement inputs makes the ADM1026 extremely flexible and versatile. The device has an 8-bit A/D converter, and 17 analog measurement input pins that can be configured in different ways. Pins 25 and 26 are dedicated temperature inputs and may be connected to the cathode and anode of a remote temperature- sensing diode. Pins 27 and 28 may be configured as temperature inputs and connected to a second temperature-sensing diode, or may be reconfigured as analog inputs with a range of 0 V to 2.5 V. Pins 29 to 33 are dedicated analog inputs with on-chip attenuators configured to monitor VBAT, +5 V, −12 V, +12 V, and the processor core voltage VCCP, respectively. Pins 34 to 41 are general-purpose analog inputs with a range of 0 V to 2.5 V or 0 V to 3 V. These are mainly intended for monitoring SCSI termination voltages, but may be used for other purposes. The ADC also accepts input from an on-chip band gap temperature sensor that monitors system ambient temperature. In addition, the ADM1026 monitors the supply from which it is powered, 3.3 V STBY, so there is no need for a separate pin to monitor the power supply voltage. The ADM1026 has eight pins that are general-purpose logic I/O pins (Pins 1, 2, and 43 to 48), a pin that can be configured as GPIO or as a bidirectional thermal interrupt (THERM) pin (Pin 42), and eight pins that can be configured for fan speed measurement or as general-purpose logic pins (Pins 3 to 6 and Pins 9 to 12). Sequential Measurement When the ADM1026 monitoring sequence is started, it cycles sequentially through the measurement of analog inputs and the temperature sensor, while at the same time the fan speed inputs are independently monitored. Measured values from these inputs are stored in value registers. These can be read 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 interrupt status registers. An out-of-limit event generates an interrupt on the INT line (Pin 17). Any or all of the interrupt status bits can be masked by appropriate programming of the interrupt mask registers. Chassis Intrusion A chassis intrusion input (Pin 16) is provided to detect unauthorized tampering with the equipment. This event is latched in a battery-backed register bit. Resets The ADM1026 has two power-on reset outputs, RESETMAIN and RESETSTBY, that are asserted when 3.3 V MAIN or 3.3 V STBY fall below the reset threshold. These give a 180 ms reset pulse at power-up. RESETMAIN also functions as an active-low RESET input. |
Số phần tương tự - ADM1026JST-REEL |
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Mô tả tương tự - ADM1026JST-REEL |
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