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ADT7482 Datasheet(PDF) 8 Page - ON Semiconductor |
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ADT7482 Datasheet(HTML) 8 Page - ON Semiconductor |
8 / 20 page ADT7482 http://onsemi.com 8 Figure 15. Input Signal Conditioning I N1 y IN2 y I IBIAS VDD VOUT+ TO ADC VOUT– REMOTE SENSING TRANSISTOR NOTE: CAPACITOR C1 IS OPTIONAL. D+ D– C1 BIAS DIODE LOW−PASS FILTER fC = 65kHz IT SHOULD ONLY BE USED IN NOISY ENVIRONMENTS. Temperature Measurement Results The results of the local and remote temperature measurements are stored in the local and remote temperature value registers and are compared with limits programmed into the local and remote high and low limit registers. The local temperature measurement is an 8−bit measurement with 1 °C resolution. The remote temperature measurements are 10−bit measurements, with the 8 MSBs stored in one register and the 2 LSBs stored in another register. Table 1 is a list of the temperature measurement registers. Table 1. Register Address for the Temperature Values Temperature Channel Register Address, MSBs Register Address, LSBs Local 0x00 N/A Remote 1 0x01 0x10 (2 MSBs) Remote 2 0x30 0x33 (2 MSBs) Set Bit 3 of the Configuration 1 register to 1, to read the Remote 2 temperature values from the following register addresses: • Remote 2, MSBs = 0x01 • Remote 2, LSBs = 0x10 The above is true only when Bit 3 of the Configuration 1 register is set. To read the Remote 1 temperatures, switch this bit back to 0. Only the two MSBs in the remote temperature low byte are used. This gives the remote temperature measurement a resolution of 0.25 °C. Table 2 shows the data format for the remote temperature low byte. Table 2. Extended Temperature Resolution (Remote Temperature Low Byte) Extended Resolution Remote Temperature Low Byte 0.00°C 0 000 0000 0.25°C 0 100 0000 0.50°C 1 000 0000 0.75°C 1 100 0000 When reading the full remote temperature value, both the high and low byte, the two registers should be read LSB first and then MSB. Reading the LSB causes the MSB to be locked until it is read. This guarantees that the two values are read as a result of the same temperature measurement. Temperature Measurement Range The temperature measurement range for both local and remote measurements is, by default, 0 °C to +127°C. However, the ADT7482 can be operated using an extended temperature range. It can measure the full temperature range of a remote thermal diode, from −55 °C to +150°C. Switch between these two temperature ranges by setting or clearing Bit 2 in the Configuration 1 register. A valid result is available in the next measurement cycle after changing the temperature range. In extended temperature mode, the upper and lower temperature measured by the ADT7482 is limited by the remote diode selection. The temperature registers themselves can have values from −64 °C to +191°C. However, most temperature−sensing diodes have a maximum temperature range of −55 °C to +150°C. Note that while both local and remote temperature measurements can be made while the part is in extended temperature mode, the ADT7482 itself should not be exposed to temperatures greater than those specified in the Absolute Maximum Ratings section. Further, the device is only guaranteed to operate as specified at ambient temperatures from −40 °C to +120°C. Temperature Data Format When the measurement range is in extended mode, an offset binary data format is used for both local and remote results. Temperature values in the offset binary data format are offset by +64. Examples of temperatures in both data formats are shown in Table 3. Switching between measurement ranges can be done at any time. Switching the range also switches the data format. The next temperature result following the switching is reported back to the register in the new format. However, the contents of the limit registers do not change. Ensure that when the data format changes, the limit registers are reprogrammed as necessary. For more information, refer to the Limit Registers section. |
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