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ADM1031ARQZ Scheda tecnica(PDF) 9 Page - ON Semiconductor |
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ADM1031ARQZ Scheda tecnica(HTML) 9 Page - ON Semiconductor |
9 / 30 page ADM1031 http://onsemi.com 9 Figure 16. Writing to the Address Pointer Register Only Figure 17. Reading Data from a Previously Selected Register STOP BY MASTER ACK. BY ADM1031 ACK. BY ADM1031 START BY MASTER SCL 11 9 9 FRAME 1 SERIAL BUS ADDRESS BYTE FRAME 2 ADDRESS POINTER REGISTER BYTE 0 1 0 1 1 A1 A0 R/W D7 D6 D5 D4 D3 D2 D1 D0 SDA STOP BY MASTER ACK. BY ADM1031 NO ACK. BY MASTER START BY MASTER SCL 11 9 9 FRAME 1 SERIAL BUS ADDRESS BYTE FRAME 2 DATA BYTE FROM ADM1031 0 1 0 1 1 A1 A0 R/W D7 D6 D5 D4 D3 D2 D1 D0 SDA Alert Response Address Alert Response Address (ARA) is a feature of SMBus devices that allows an interrupting device to identify itself to the host when multiple devices exist on the same bus. The INT output can be used as an interrupt output or can be used as an SMBALERT. One or more INT outputs can be connected to a common SMBALERT line connected to the master. If a device’s INT line goes low, the following procedure occurs: 1. SMBALERT is pulled low. 2. Master initiates a read operation and sends the Alert Response Address (ARA = 0001 100). This is a general call address that must not be used as a specific device address. 3. The device whose INT output is low responds to the alert response address, and the master reads its device address. The address of the device is now known and can be interrogated in the usual way. 4. If more than one device’s INT output is low, the one with the lowest device address has priority, in accordance with normal SMBus arbitration. 5. Once the ADM1031 has responded to the alert response address, it resets its INT output. However, if the error condition that caused the interrupt persists, then INT is reasserted on the next monitoring cycle. Temperature Measurement System Internal Measurement The ADM1031 contains an on−chip bandgap temperature sensor. The on−chip ADC performs conversions on the output of this sensor and outputs the temperature data in 10−bit twos complement format. The resolution of the local temperature sensor is 0.25 °C. The format of the temperature data is shown in Table 2. External Measurement The ADM1031 can measure the temperatures of two external diode sensors or diode−connected transistors, connected to Pins 9 and 10, and Pins 11 and 12. These pins are dedicated temperature input channels. The function of Pin 7 is as a THERM input/output and is used to flag overtemperature conditions. The forward voltage of a diode or diode−connected transistor, operated at a constant current, exhibits a negative temperature coefficient of about –2 mV/ °C. Unfortunately, the absolute value of VBE, varies from device to device, and individual calibration is required to null this out. As a result, the technique is unsuitable for mass production. The technique used in the ADM1031 is to measure the change in VBE when the device is operated at two different currents. This is given by: DVBE = KT/q × In (N) where: K is Boltzmann’s constant. q is charge on the carrier. T is absolute temperature in Kelvins. N is ratio of the two currents. Figure 18 shows the input signal conditioning used to measure the output of an external temperature sensor. This figure shows the external sensor as a substrate transistor, provided for temperature monitoring on some microprocessors, but it could equally well be a discrete transistor. |
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