Rainbow Electronics DS1616 - Manual (Page 16)

DS1616
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SIP - Sample in Progress - This bit indicates that the DS1616 is currently in the process of acquiring a
temperature and/or ADC sample. When the SIP bit is 0, a data conversion is not currently in process and
the next conversion will not begin for at least 250 ms. When the SIP bit is a 1, a data conversion is in
progress and NO registers or memory locations should be read or written. The SIP bit will be a 1 for a
maximum of 750 ms.
LOBAT - Low Battery Flag - This bit reflects the status of the backup power source connected to the
V
BAT
pin. A logic 1 for this bit indicates an exhausted lithium energy source.
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. The Clear Memory
command has no effect on this bit.
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. The Clear Memory
command has no effect on this bit.
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. The Clear Memory command has no effect on this bit.
SAMPLE RATE REGISTER
MSb LSb
SR7 SR6 SR5 SR4 SR3 SR2 SR1 SR0
The data sample rate for the DS1616 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 1 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 DS1616 begins to take data
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.