Rainbow Electronics DS1615 - Manual (Page 14)

DS1615
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TLF - Temperature Low Flag - A logic 1 in the Temperature Low Flag bit indicates that the temperature
is/has been less than or equal to the value in the Temperature Low Threshold register. If TLIE is also a
logic 1, the
INT pin will go low. TLF is cleared by writing this bit to a logic 0.
THF - Temperature High Flag - A logic 1 in the Temperature High Flag bit indicates that the temperature
is/has been greater than or equal to the value in the Temperature High Threshold register. If THIE is also
a logic 1, the
INT pin will go low. THF is cleared by writing this bit to a logic 0.
ALMF - Alarm Flag - A logic 1 in the Alarm Flag bit indicates that the current time has matched the time
of day Alarm registers. If the AIE bit is also a logic 1, the
INT pin will go low. ALMF is cleared by
writing this bit to a logic 0.
SAMPLE RATE REGISTER
MSb LSb
SR7 SR6 SR5 SR4 SR3 SR2 SR1 SR0
The data sample rate for the DS1615 can range from once per minute to once per 255 minutes. The rate
is equal to the value written to the Sample Rate register multiplied by one minute.
This register can only be written to a new value when the MEM CLR bit in the Status register is set to 1.
In other words, once a datalog mission has started, it cannot be changed without first issuing the Clear
Memory command.
The Sample Rate register is cleared by issuing the Clear Memory command.
START DELAY RESISTER
MSb LSb
D15 D14 D13 D12 D11 D10 D9 D8
D7 D6 D5 D4 D3 D2 D1 D0
The Start Delay register determines the amount of delay before the DS1615 begins to take temperature
measurements. The amount of the delay is roughly equal to the value in the register multiplied by one
minute. If the register contains 00h, the first sample will begin when the seconds register rolls over from
59 to 00.
The value in this register decrements each time the seconds register rolls over from 59 to 00 until the Start
Delay register reaches a value of 00h.
TEMPERATURE HIGH THRESHOLD REGISTER
MSb LSb
TH7 TH6 TH5 TH4 TH3 TH2 TH1 TH0
This register determines the high threshold for interrupt generation from the thermal sensor. If the
temperature is greater than or equal to the value in this register, an interrupt will be activated if the
Temperature High Interrupt Enable (THIE) bit is set to a logic 1.
TEMPERATURE LOW THRESHOLD REGISTER
MSb LSb
TL7 TL6 TL5 TL4 TL3 TL2 TL1 TL0