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ADT7461ARMZ-R7 Arkusz danych(PDF) 11 Page - ON Semiconductor |
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ADT7461ARMZ-R7 Arkusz danych(HTML) 11 Page - ON Semiconductor |
11 / 20 page ADT7461 http://onsemi.com 11 When Pin 6 is configured as THERM2, only the high temperature limits are relevant. If Flag 6 and/or Flag 4 are set, the THERM2 output goes low to indicate the temperature measurements are outside the programmed limits. Flag 5 and Flag 3 have no effect on THERM2. The behavior of THERM2 is otherwise the same as THERM. Table 10. STATUS REGISTER BIT ASSIGNMENTS Bit Name Function 7 BUSY (Note 1) 1 when ADC is converting 6 LHIGH (Note 2) 1 when local high temperature limit is tripped 5 LLOW (Note 2) 1 when local low temperature limit is tripped 4 RHIGH (Note 2) 1 when remote high temperature limit is tripped 3 RLOW (Note 2) 1 when remote low temperature limit is tripped 2 OPEN (Note 2) 1 when remote sensor is an open circuit 1 RTHRM 1 when remote THERM limit is tripped 0 LTHRM 1 when local THERM limit is tripped 1. Polling of the BUSY bit is not recommended. 2. These flags stay high until the status register is read or they are reset by POR. 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 value is stored as a 10-bit, twos complement value in Registers 0x11 (high byte) and 0x12 (low byte, left justified). Only the upper 2 bits of Register 0x12 are used. The MSB of Register 0x11 is the sign bit. The minimum offset that can be programmed is −128 °C, and the maximum is +127.75 °C. The value in the offset register is added to 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 11. 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 000000 −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 ADT7461 is in standby mode, after which the device returns to standby. Writing to the one-shot register address (0x0F) causes the ADT7461 to perform a conversion and comparison on both the internal and the external temperature channels. This is not a data register as such; the write operation to Address 0x0F 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 12. CONSECUTIVE ALERT REGISTER CODES Register Value Number of Out-of-Limit Measurements Required yxxx 000x 1 yxxx 001x 2 yxxx 011x 3 yxxx 111x 4 NOTE: x = don’t care bits, and y = SMBus timeout bit. Default = 0. See SMBus section for more information. |
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