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ADM1022 bảng dữ liệu(PDF) 7 Page - Analog Devices |
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ADM1022 bảng dữ liệu(HTML) 7 Page - Analog Devices |
7 / 19 page REV. 0 ADM1022 –7– FREQUENCY – Hz 10 0 50 50M 500 5k 50k 500k 5M 6 5 4 2 1 3 10mV SQ. WAVE 9 8 7 100k 25M Figure 8. Temperature Error vs. Differential-Mode Noise Frequency TEMPERATURE – C 1.7 –40 VDD = 3.0V –20 0 20 40 60 80 100 130 1.8 1.9 2.0 2.1 2.2 2.3 VDD = 3.3V VDD = 5.5V 110 90 70 50 30 10 –10 –30 120 Figure 9. Standby Supply Current vs. Supply Voltage TEMPERATURE – C 100 150 200 250 300 350 400 RST1 RST2 –40 –20 0 2040 6080 100 130 110 90 70 50 30 10 –10 –30 120 Figure 10. Power-up Reset vs. Temperature GENERAL DESCRIPTION The ADM1022 is a low-cost temperature monitor and fan con- troller for microprocessor-based systems. The temperature of one or two remote sensor diodes may be measured, allowing monitoring of processor temperature in single- or dual-processor systems. The chip also contains an on-chip sensor to allow ambient temperature to be monitored. Measured values can be read out via a serial System Manage- ment Bus, and values for limit comparisons can be programmed in over the same serial bus. The ADM1022 also contains a DAC for fan speed control. Automatic hardware temperature trip points are provided for fault tolerant fan control and the fan will be driven to full speed if they are exceeded. Two interrupt outputs are provided, which will be asserted if the software or hardware limits are exceeded. Finally, the chip has two supply voltage monitors for brownout detection. These drive two reset pins, one of which is bidirec- tional. A manual reset input is also provided. INTERNAL REGISTERS OF THE ADM1022 A brief description of the ADM1022’s principal internal regis- ters is given below. More detailed information on the function of each register is given in Tables IV to IX. Configuration Register: Provides control and configuration. Address Pointer Register: This register contains the address that selects one of the other internal registers. When writing to the ADM1022, the first byte of data is always a register address, which is written to the Address Pointer Register. Interrupt ( INT) Status Register: This register provides status of each Interrupt event. It is also mirrored by a second register at address 4Ch. Interrupt ( INT) Mask Register: Allows masking of individual interrupt sources. Value and Limit Registers: The results of temperature measure- ments are stored in these registers, along with their limit values. Analog Output Register: The code controlling the analog out- put DAC is stored in this register. SERIAL BUS INTERFACE Control of the ADM1022 is carried out via the serial bus. The ADM1022 is connected to this bus as a slave device, under the control of a master device, e.g., the PIIX4. The ADM1022 has a 7-bit serial bus address. When the device is powered up, it will do so with a default serial bus address. The five MSBs of the address are set to 01011, the two LSBs are deter- mined by the logical states of Pin 13 (ADD/NTEST_OUT). This is a three-state input that can be grounded, connected to VCC or left open-circuit to give three different addresses. The state of the ADD pin is only sampled at power-up, so changing ADD with power-on will have no effect until the device is powered off then on again. Table I. ADD Pin Truth Table ADD Pin A1 A0 GND 1 0 No Connect 0 0 VCC 01 |
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