ADM1032 ON Semiconductor, ADM1032 Datasheet
ADM1032
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ADM1032 Summary of contents
Page 1
... This output can be used as an interrupt SMBus alert. The THERM output is a comparator output that allows CPU clock throttling or on/off control of a cooling fan. An ADM1032-1 and ADM1032-2 are available. The difference between the ADM1032 and theADM1032-1 is the default value of the external THERM limit ...
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... Changes to Addressing the Device Section ...................................8 Updated Outline Dimensions........................................................14 Serial Bus Interface .....................................................................11 Addressing the Device................................................................12 ALERT Output ............................................................................14 Low Power Standby Mode .........................................................14 The ADM1032 Interrupt System ..............................................14 Sensor Fault Detection ...............................................................15 Applications Information—Factors Affecting Accuracy...........16 Remote Sensing Diode ...............................................................16 Thermal Inertia and Self-Heating ............................................16 Layout Considerations ...............................................................17 Application Circuit ...
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... SDATA forced to 0.6 V ALERT forced to 0 between 10% points LOW t between 90% points HIGH Time from 10% of SDATA to 90% of SCLK Time from 90% of SCLK to 10% of SDATA Time for 10% or 90% of SDATA to 10% of SCLK Between start/stop condition ADM1032 ...
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... ADM1032 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Positive Supply Voltage ( GND DD D+ D− to GND SCLK, SDATA, ALERT THERM Input Current, SDATA, THERM Input Current, D− ESD Rating, All Pins (Human Body Model) Maximum Junction Temperature (T Max) J Storage Temperature Range IR Reflow Peak Temperature ...
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... Logic Input/Output, SMBus Serial Data. Open-drain output. Requires pull-up resistor. 8 SCLK Logic Input, SMBus Serial Clock. Requires pull-up resistor. SCLK SDATA 2 7 ADM1032 TOP VIEW D– ALERT (Not to Scale) THERM 4 5 GND Figure 3. Pin Configuration , the same supply as the ADM1032 DD Rev Page www.onsemi.com ADM1032 ...
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... ADM1032 TYPICAL PERFORMANCE CHARACTERISTICS GND 0 – –8 DD –12 – LEAKAGE RESISTANCE (M Ω ) Figure 4. Temperature Error vs. Leakage Resistance 1.0 0.5 0 –0 TEMPERATURE (°C) Figure 5. Temperature Error vs. Actual Temperature Using 2N3906 40mV p 10mV p-p IN – ...
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... SCLK FREQUENCY (kHz) Figure 11. Standby Supply Current vs. Clock Frequency 100M 3.3V DD 250 500 750 1000 Rev Page www.onsemi.com 0.5 1.0 1.5 2.0 2.5 3.0 3.5 SUPPLY VOLTAGE (V) Figure 12. Standby Supply Current vs. Supply Voltage ADM1032 4.0 4.5 5.0 ...
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... Unfortunately, this technique requires calibration to null out the effect of the absolute value which varies from device to device. BE The technique used in the ADM1032 is to measure the change in V when the device is operated at two different currents ...
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... Value Registers The ADM1032 has three registers to store the results of local and remote temperature measurements. These registers are written to by the ADC only and can be read over the SMBus. Offset Register Series resistance on the D+ and D− ...
Page 10
... One-Shot Register The one-shot register is used to initiate a single conversion and Power-On Default comparison cycle when the ADM1032 is in standby mode, after 0 which the device returns to standby. This is not a data register as such, and it is the write operation that causes the one-shot conversion ...
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... Not Applicable FF Not Applicable Writing to Address 0F causes the ADM1032 to perform a single measurement not a data register as such and it does not matter what data is written to it. SERIAL BUS INTERFACE Control of the ADM1032 is carried out via the serial bus. The ADM1032 is connected to this bus as a slave device, under the control of a master device ...
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... The ADM1032 and the ADM1032-1 are available with one SMBUS address, which is Hex 4C (1001 100). The ADM1032-2 is also available with one SMBUS address; however, that address is Hex 4D (1001 101). The serial bus protocol operates as follows: 1 ...
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... ADM1032 FRAME 2 ADDRESS POINTER REGISTER BYTE ACK. BY ADM1032 FRAME 3 DATA BYTE ACK. BY ADM1032 FRAME 2 ADDRESS POINTER REGISTER BYTE ACK. BY ADM1032 FRAME 2 DATA BYTE FROM ADM1032 ADM1032 9 STOP BY MASTER 9 STOP BY MASTER 9 STOP BY MASTER ...
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... ALERT outputs were low have responded. LOW POWER STANDBY MODE The ADM1032 can be put into a low power standby mode by setting Bit 6 of the configuration register. When Bit 6 is low, the ADM1032 operates normally. When Bit 6 is high, the ADC is ...
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... SENSOR FAULT DETECTION At the D+ input, the ADM1032 has a fault detector that detects if the external sensor diode is open circuit. This is a simple voltage comparator that trips if the voltage at D+ exceeds V − (typical). The output of this comparator is checked ...
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... ADM1032 230 μA and the low level current, HIGH μA. If the ADM1032 current levels do not match LOW the levels of the CPU manufacturers, then it can become necessary to remove an offset. The CPU’s data sheet advises whether this offset needs to be removed and how to calculate it ...
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... ADM1032 is measuring very small voltages from the remote sensor, so care must be taken to minimize noise induced at the sensor inputs. The following precautions should be taken. 1. Place the ADM1032 as close as possible to the remote sensing diode. Provided that the worst noise sources, that is, clock generators, data/address buses, and CRTs, are avoided, this distance can be four to eight inches. 2. Route the D+ and D− ...
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... ADM1032 OUTLINE DIMENSIONS 5.00 (0.1968) 4.80 (0.1890 6.20 (0.2440) 4.00 (0.1574) 5.80 (0.2284) 3.80 (0.1497 1.27 (0.0500) BSC 1.75 (0.0688) 1.35 (0.0532) 0.25 (0.0098) 0.10 (0.0040) 0.51 (0.0201) COPLANARITY 0.25 (0.0098) 0.31 (0.0122) SEATING 0.10 0.17 (0.0067) PLANE COMPLIANT TO JEDEC STANDARDS MS-012-AA CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. ...
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... ADM1032ARM-REEL7 0°Cto 120°C 1 ADM1032ARMZ 0°Cto 120°C 1 ADM1032ARMZ-REEL 0°Cto 120°C 1 ADM1032ARMZ-R7 0°Cto 120°C ADM1032ARM-1 0°Cto 120°C ADM1032ARM-1REEL 0°Cto 120°C ADM1032ARM-1RL7 0°Cto 120°C 1 ADM1032ARMZ-1 0°Cto 120°C 1 ADM1032ARMZ-1RL 0°Cto 120°C ADM1032ARMZ-1REEL7 1 0°Cto 120°C ...