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DS1921Z Datasheet(PDF) 11 Page - Maxim Integrated Products |
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DS1921Z Datasheet(HTML) 11 Page - Maxim Integrated Products |
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11 / 45 page  DS1921H/Z 11 of 45 BIT DESCRIPTION BIT(S) DEFINITION MIP: Mission in Progress b5 If this bit reads 1 the DS1921H/Z has been set up for a mission and this mission is still in progress. A mission is started if the EM bit of the Control Register (address 20Eh) is 0 and a non-zero value is written to the Sample Rate Register, address 20Dh. The MIP bit returns from logic 1 to logic 0 when a mission is ended. A mission will end with the first write attempt (Copy Scratchpad command) to any register in the address range of 200h to 213h. Alternatively, a mission can be ended by directly writing to the Status Register and setting the MIP bit to 0. The MIP bit cannot be set to 1 by writing to the status register. SIP: Sample in Progress b4 If this bit reads 1 the DS1921H/Z is currently performing a temperature conversion as part of a mission in progress. The mission samples occur on the seconds rollover from 59 to 00. The SIP bit will change from 0 to 1 approximately 250ms before the actual temperature conversion begins allowing the circuitry of the chip to wake-up. A temperature conversion including a wake-up phase takes maximum 875ms. During this time read accesses to the memory pages 17 and higher are permissible but may reveal invalid data. TLF: Temperature Low Flag b2 Logic 1 in the Temperature Low Flag bit indicates that a temperature measurement during a mission revealed a temperature equal to or lower than the value in the Temperature Low Threshold Register. The Temperature Low Flag can be cleared at any time by writing this bit to 0. This flag must be cleared before starting a new mission. THF: Temperature High Flag b1 Logic 1 in the Temperature High Flag bit indicates that a temperature measurement during a mission revealed a temperature equal to or higher than the value in the Temperature High Threshold Register. The Temperature High Flag can be cleared at any time by writing this bit to 0. This flag must be cleared before starting a new mission. TAF: Timer Alarm Flag b0 If this bit reads 1, a RTC alarm has occurred (see section TIMEKEEPING for details). The Timer Alarm Flag can be cleared at any time by writing this bit to logic 0. Since the timer alarm cannot be disabled, the TAF flag usually reads 1 during a mission. This flag should be cleared before starting a new mission. MISSION TIME STAMP The Mission Time Stamp indicates the time and date of the first temperature conversion of a mission. Subsequent temperature conversions will take place as many minutes apart from each other as specified by the value in the Sample Rate Register. Mission samples occur on minute boundaries. Mission Time Stamp Register Bitmap ADDR b7 b6 b5 b4 b3 b2 b1 b0 0215h 0 10 Minutes Single Minutes 0216h 0 12/24 20h. AM/PM 10h. Single Hours 0217h 0 0 10 Date Single Date 0218h 0 0 0 10m. Single Months 0219h 10 Years Single Years MISSION SAMPLES COUNTER The Mission Samples Counter indicates how many temperature measurements have taken place during the current mission in progress (if MIP = 1) or during the latest mission (if MIP = 0). The value is stored as an unsigned 24-bit integer number. This counter is reset through the Clear Memory command. |
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Similar Description - DS1921Z |
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