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ADT7461ARMZ-2RL7 Datasheet(PDF) 8 Page - ON Semiconductor |
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ADT7461ARMZ-2RL7 Datasheet(HTML) 8 Page - ON Semiconductor |
8 / 20 page ADT7461 http://onsemi.com 8 Figure 15. Input Signal Conditioning Error vs. Series Resistance I N1 ×IN2×I IBIAS VDD VOUT+ TO ADC VOUT– REMOTE SENSING TRANSISTOR *CAPACITOR C1 IS OPTIONAL. IT SHOULD ONLY BE USED IN NOISY ENVIRONMENTS. D+ D– C1* BIAS DIODE LOW−PASS FILTER fC = 65kHz 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 value is in Register 0x00 and has a resolution of 1 °C. The external temperature value is stored in two registers, with the upper byte in Register 0x01 and the lower byte in Register 0x10. Only the two MSBs in the external temperature low byte are used. This gives the external temperature measurement a resolution of 0.25 °C. Table 1 shows the data format for the external temperature low byte. Table 1. 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 external temperature value, both the high and low byte, the two registers should be read in succession. Reading one register does not lock the other, so both should be read before the next conversion finishes. In practice, there is more than enough time to read both registers, as transactions over the SMBus are significantly faster than a conversion time. Temperature Measurement Range The temperature measurement range for both internal and external measurements is, by default, 0 °C to +127°C. However, the ADT7461 can be operated using an extended temperature range. It can measure the full temperature range of an external diode, from −55 °C to +150°C. The user can switch between these two temperature ranges by setting or clearing Bit 2 in the configuration 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 that can be measured by the ADT7461 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. Above 150 °C, they may lose their semiconductor characteristics and approximate conductors instead. This results in a diode short. In this case, a read of the temperature result register gives the last good temperature measurement. The user should be aware that the temperature measurement on the external channel may not be accurate for temperatures that are outside the operating range of the remote sensor. While both local and remote temperature measurements can be made while the part is in extended temperature mode, the ADT7461 itself should not be exposed to temperatures greater than those specified in the Absolute Maximum Ratings section. Also, the device is guaranteed to operate only as specified at ambient temperatures from −40 °C to +120°C. Temperature Data Format The ADT7461 has two temperature data formats. When the temperature measurement range is from 0 °C to +127°C (default), the temperature data format for both internal and external temperature results is binary. When the measurement range is in extended mode, an offset binary data format is used for both internal and external results. Temperature values in the offset binary data format are offset by 64 °C. Examples of temperatures in both data formats are shown in Table 2. |
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