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DS1921Z-F5 Datasheet(PDF) 10 Page - Maxim Integrated Products |
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DS1921Z-F5 Datasheet(HTML) 10 Page - Maxim Integrated Products |
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10 / 45 page  DS1921H/Z 10 of 45 BIT DESCRIPTION BIT(S) DEFINITION TLS: Temperature Low Alarm Search b2 If this bit is 1, the device will respond to a Conditional Search command if during a mission the temperature has reached or is lower than the Low Temperature Threshold stored at address 020Bh. THS: Temperature High Alarm Search b1 If this bit is 1, the device will respond to a Conditional Search command if during a mission the temperature has reached or is higher than the High Temperature Threshold stored at address 020Ch. TAS: Timer Alarm Search b0 If this bit is 1, the device will respond to a Conditional Search command if during a mission a timer alarm has occurred. Since a timer alarm cannot be disabled, the TAF flag usually reads 1 during a mission. Therefore it may be advisable to set the TAS bit to a 0, in most cases. Mission Start Delay Counter The content of the Mission Start Delay Counter determines how many minutes the device will wait before starting the logging process. The mission start delay value is stored as unsigned 16-bit integer number at addresses 212h (low byte) and 213h (high byte). The maximum delay is 65535 minutes, equivalent to 45 days, 12 hours, and 15 minutes. For a typical mission, the Mission Start Delay is 0. If a mission is too long for a single DS1921H/Z to store all temperature readings at the selected sample rate, one can use several devices, staggering the Mission Start Delay to record the full period. In this case, the RO bit in the control register (address 020Eh) must be set to 0 to prevent overwriting of the recorded temperature log after the datalog memory is full. See Mission Start and Logging Process description and flow chart for details. Status Register The Status Register holds device status information and alarm flags. The register is located at address 214h. Writing to this register will not necessarily end a mission. Status Register Bitmap ADDR b7 b6 b5 b4 b3 b2 b1 b0 0214h TCB MEMCLR MIP SIP 0 TLF THF TAF The functional assignments of the individual bits are explained in the table below. The bits MIP, TLF, THF and TAF can only be written to 0. All other bits are read-only. Bit 3 has no function. Status Register Details BIT DESCRIPTION BIT(S) DEFINITION TCB: Temperature Core Busy b7 If this bit reads 0 the DS1921H/Z is currently performing a temperature conversion, either self-initiated because of a mission being in progress or initiated by a command when a mission is not in progress. The TCB bit goes low just before a conversion starts and returns to high just after the result is latched into the readout register at address 0211h. MEMCLR: Memory Cleared b6 If this bit reads 1, the memory pages 17 and higher (alarm time stamps/durations, temperature histogram, excluding datalog memory), as well as the Mission Time Stamp, Mission Samples Counter, Mission Start Delay and Sample Rate have been cleared to 0 from executing a Clear Memory function command. The MEMCLR bit will return to 0 as soon as writing a non-0 value to the Sample Rate Register starts a new mission, provided that the EM bit is also 0. The memory has to be cleared in order for a mission to start. |
Similar Part No. - DS1921Z-F5 |
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Similar Description - DS1921Z-F5 |
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