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ADT7421ARZ-REEL7 Datasheet(PDF) 10 Page - ON Semiconductor |
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ADT7421ARZ-REEL7 Datasheet(HTML) 10 Page - ON Semiconductor |
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10 / 20 page  ADT7421 http://onsemi.com 10 Offset Register Offset errors can be introduced into the remote temperature measurement by clock noise or when the thermal transistor is located away from the hot spot. To achieve the specified accuracy on this channel, these offsets must be removed. The offset value is stored as a 10−bit, twos complement value in Register 0x11 (high byte) and Register 0x12 (low byte, left justified). Only the upper two bits of Register 0x12 are used. The MSB of Register 0x11 is the sign bit. The minimum, programmable offset is −128 °C, and the maximum is +127.75 °C. The value in the offset register is added to, or subtracted from, the measured value of the remote temperature. The offset register powers up with a default value of 0 °C and has no effect unless the user writes a different value to it. Table 6. Sample Offset Register Codes Offset Value 0x11 0x12 −128°C 1000 0000 00 00 0000 −4°C 1111 1100 00 00 0000 −1°C 1111 1111 00 00 0000 −0.25°C 1111 1111 11 00 0000 0°C 0000 0000 00 00 0000 +0.25°C 0000 0000 01 00 0000 +1°C 0000 0001 00 00 0000 +4°C 0000 0100 00 00 0000 +127.75°C 0111 1111 11 00 0000 One−Shot Register The one−shot register is used to initiate a conversion and comparison cycle when the ADT7421 is in standby mode, after which the device returns to standby. Writing to the one−shot register address (0x0F) causes the ADT7421 to perform a conversion and comparison on both the internal and the external temperature channels. This is not a data register as such, and it is the write operation to Address 0x0F that causes the one−shot conversion. The data written to this address is irrelevant and is not stored. Consecutive ALERT Register The value written to this register determines how many out−of−limit measurements must occur before an ALERT is generated. The default value is that one out−of−limit measurement generates an ALERT. The maximum value that can be chosen is 4. The purpose of this register is to allow the user to perform some filtering of the output. This is particularly useful at the fastest three conversion rates, where no averaging takes place. This register is at Address 0x22. Table 7. Consecutive ALERT Register 0x22 Bits Value† Number of Out−of−Limit Measurements Required <3−0> 000x 1 001x 2 011x 3 111x 4 †x = Don’t care bit. |
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