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ADT7483A Datasheet(PDF) 11 Page - ON Semiconductor |
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ADT7483A Datasheet(HTML) 11 Page - ON Semiconductor |
11 / 20 page ADT7483A http://onsemi.com 11 Table 12. STATUS REGISTER 1 BIT ASSIGNMENTS Bit Mnemonic Function ALERT 7 BUSY 1 when ADC Converting No 6 LHIGH (Note 1) 1 when Local High Temperature Limit Tripped Yes 5 LLOW (Note 1) 1 when Local Low Temperature Limit Tripped Yes 4 R1HIGH (Note 1) 1 when Remote 1 High Temperature Limit Tripped Yes 3 R1LOW (Note 1) 1 when Remote 1 Low Temperature Limit Tripped Yes 2 D1 OPEN (Note 1) 1 when Remote 1 Sensor Open Circuit Yes 1 R1THRM1 1 when Remote1 THERM Limit Tripped No 0 LTHRM1 1 when Local THERM Limit Tripped No 1. These flags stay high until the status register is read, or they are reset by POR. Table 13. STATUS REGISTER 2 BIT ASSIGNMENTS Bit Mnemonic Function ALERT 7 Res Reserved for Future Use No 6 Res Reserved for Future Use No 5 Res Reserved for Future Use No 4 R2HIGH (Note 1) 1 when Remote 2 High Temperature Limit Tripped Yes 3 R2LOW (Note 1) 1 when Remote 2 Low Temperature Limit Tripped Yes 2 D2 OPEN (Note 1) 1 when Remote 2 Sensor Open Circuit Yes 1 R2THRM1 1 when Remote 2 THERM Limit Tripped No 0 ALERT 1 when ALERT Condition Exists No 1. These flags stay high until the status register is read, or they are reset by POR. The eight flags that can generate an ALERT are NOR’d together, so if any of them are high, the ALERT interrupt latch is set and the ALERT output goes low (provided they are not masked out). Reading the Status 1 register will clear the five flags, Bit 6 to Bit 2 in Status Register 1, provided the error conditions that caused the flags to be set have gone away. Reading the Status 2 register will clear the three flags, Bit 4 to Bit 2 in Status Register 2, provided the error conditions that caused the flags to be set have gone away. A flag bit can only be reset if the corresponding value register contains an in-limit measurement or if the sensor is good. The ALERT interrupt latch is not reset by reading the status register. It is reset when the ALERT output has been serviced by the master reading the device address, provided the error condition has gone away and the status register flag bits have been reset. When Flag 1 and/or Flag 0 of Status Register 1, or Flag 1 of Status Register 2 are set, the THERM output goes low to indicate that the temperature measurements are outside the programmed limits. The THERM output does not need to be reset, unlike the ALERT output. Once the measurements are within the limits, the corresponding status register bits are automatically reset and the THERM output goes high. The user may add hysteresis by programming Register 0x21. The THERM output will be reset only when the temperature falls below the THERM limit minus hysteresis. When Pin 13 is configured as THERM2, only the high temperature limits are relevant. If Flag 6, Flag 4 of Status Register 1, or Flag 4 of Status Register 2 are set, the THERM2 output goes low to indicate that the temperature measurements are outside the programmed limits. Flag 5 and Flag 3 of Status Register 1, and Flag 3 of Status Register 2 have no effect on THERM2. The behavior of THERM2 is otherwise the same as THERM. Bit 0 of Status Register 2 is set whenever the ALERT output of the ADT7483A is asserted low. This means that the user need only read Status Register 2 to determine if the ADT7483A is responsible for the ALERT. Bit 0 of Status Register 2 is reset when the ALERT output is reset. If the ALERT output is masked, then this bit is not set. Offset Register Offset errors may be introduced into the remote temperature measurement by clock noise or by the thermal diode being located away from the hot spot. To achieve the specified accuracy on this channel, these offsets must be removed. The offset values are stored as 10-bit, twos complement values: The Remote 1 offset MSBs are stored in Register 0x11, and the LSBs are stored 0x12 (low byte, left justified). The Remote 2 offset MSBs are stored in Register 0x34, and the LSBs are stored 0x35 (low byte, left justified). The Remote 2 offset can be written to, or read from, the Remote 1 offset registers if Bit 3 of the Configuration 1 register is set to 1. This bit should be set to 0 (default) to read the Remote 1 offset values. Only the upper 2 bits of the LSB registers are used. The MSB of the MSB offset registers is the sign bit. The minimum offset that can be programmed is −128C, and the maximum is +127.75C. The value in the offset register is added or subtracted to the measured value of the remote temperature. The offset register powers up with a default value of 0C and will have no effect unless the user writes a different value to it. |
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