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ADT7483A 数据表(PDF) 10 Page - Analog Devices |
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ADT7483A 数据表(HTML) 10 Page - Analog Devices |
10 / 24 page ADT7483A Rev. 0 | Page 10 of 24 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 eight MSBs stored in one register and two LSBs stored in another register. Table 5 lists the temperature measurement registers. Table 5. Register Address for the Temperature Values Temperature Channel MSB Register Address LSB Register Address Local 0x00 N/A Remote 1 0x01 0x10 (2 MSBs) Remote 2 0x30 0x33 (2 MSBs) By setting Bit 3 of the Configuration 1 Register to 1, the Remote 2 temperature values can be read 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, this bit needs to be switched 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 6 shows the data format for the remote temperature low byte. Table 6. 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 the MSB. This is because reading the LSB will cause the MSB to be locked until it is read, guaranteeing that the two values read are 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 ADT7483A can be operated using an extended temperature range from −64°C to +191°C. This means, the ADT7483A can measure the full temperature range of a remote thermal diode, from −55°C to +150°C. The user can switch between these two temperature ranges by setting or clearing Bit 2 in the Configura- tion 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 temperatures that can be measured by the ADT7483A are 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 although both local and remote temperature measure- ments can be made while the part is in extended temperature mode, the ADT7483A should not be exposed to temperatures greater than those specified in theAbsolute 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 The ADT7483A has two temperature data formats. When the temperature measurement range is from 0°C to 127°C (default), the temperature data format for both local and remote temperature results is binary. 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 7. |
类似零件编号 - ADT7483A |
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类似说明 - ADT7483A |
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