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ISL12022MIBZ View Datasheet(PDF) - Intersil

Part NameDescriptionManufacturer
ISL12022MIBZ Real Time Clock with Embedded Crystal, ±5ppm Accuracy Intersil
Intersil Intersil
ISL12022MIBZ Datasheet PDF : 27 Pages
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ISL12022M
DST Day/Week Forward
DstDwFd contains both the Day of the Week and the Week
of the Month data for DST Forward control. DST can be
controlled either by actual date or by setting both the Week
of the month and the Day of the Week. DstDwFdE sets the
priority of the Day/Week over the Date. For DstDwFdE = 1,
Day/Week is the priority. You must have the correct Day of
Week entered in the RTC registers for the Day/Week
correction to work properly.
• Bits 0, 1, 2 contain the Day of the week information which
sets the Day of the Week that DST starts. Note that Day of
the week counts from 0 to 6, like the RTC registers. The
default for the DST Forward Day of the Week is 00h
(normally Sunday).
• Bits 3, 4, 5 contain the Week of the Month information that
sets the week that DST starts. The range is from 1 to 5, and
Week 7 is used to indicate the last week of the month. The
default for the DST Forward Week of the Month is 00h.
DST Date Forward
DstDtfd controls which Date DST begins. The format for the
Date is the same as for the RTC register, from 1 to 31. The
default value for DST forward date is 00h. DstDtFd is only
effective if DstDwFdE = 0.
DST Hour Forward
DstHrFd controls the hour that DST begins. The RTC hour and
DstHrFd registers have the same formats except there is no
Military bit for DST hour. The user sets the DST hour with the
same format as used for the RTC hour (AM/PM or MIL) but
without the MIL bit, and the DST will still advance as if the MIL
bit were there. The default value for DST hour Forward is 00h.
DST REVERSE REGISTERS (24H TO 27H)
DST end (reverse) is controlled by the following DST Registers:
DST Month Reverse
DstMoRv sets the Month that DST ends. The format is the
same as for the RTC register month, from 1 to 12. The
default value for the DST end month is October (10h).
DST Day/Week Reverse
DstDwRv contains both the Day of the Week and the Week of
the Month data for DST Reverse control. DST can be controlled
either by actual date or by setting both the Week of the month
and the Day of the Week. DstDwRvE sets the priority of the
Day/Week over the Date. For DstDwRvE = 1, Day/Week is the
priority. You must have the correct Day of Week entered in the
RTC registers for the Day/Week correction to work properly.
• Bits 0,1,2 contain the Day of the week information which
sets the Day of the Week that DST ends. Note that Day of
the week counts from 0 to 6, like the RTC registers. The
default for the DST Reverse Day of the Week is 00h
(normally Sunday).
• Bits 3, 4, 5 contain the Week of the Month information that
sets the week that DST ends. The range is from 1 to 5, and
Week 7 is used to indicate the last week of the month. The
default for the DST Reverse Week of the Month is 00h.
DST Date Reverse
DstDtRv controls which Date DST ends. The format for the
Date is the same as for the RTC register, from 1 to 31. The
default value for DST Date Reverse is 00h. The DstDtRv is
only effective if the DwRvE = 0.
DST Hour Reverse
DstHrRv controls the hour that DST ends. The RTC hour
and DstHrFd registers have the same formats except there
is no Military bit for DST hour. The user sets the DST hour
with the same format as used for the RTC hour (AM/PM or
MIL) but without the MIL bit, and the DST will still advance as
if the MIL bit were there. The default value for DST hour
Reverse is 00h.
TEMP Registers (TEMP)
The temperature sensor produces an analog voltage output
which is input to an A/D converter and produces a 10-bit
temperature value in degrees Kelvin. TK07:00 are the LSBs
of the code, and TK09:08 are the MSBs of the code. The
temperature result is actually the average of two successive
temperature measurements to produce greater resolution for
the temperature control. The output code can be converted
to degrees Centigrade by first converting from binary to
decimal, dividing by 2, and then subtracting 273d.
Temperature in °C = [(TK <9:0>)/2] - 273
(EQ. 3)
The practical range for the temp sensor register output is from
446d to 726d, or -50°C to +90°C. The temperature
compensation function is only guaranteed over -40°C to +85°C.
The TSE bit must be set to “1” to enable temperature sensing.
TABLE 22.
TEMP 7
6
5
4
3
2
1
0
TK0L TK07 TK06 TK05 TK04 TK03 TK02 TK01 TK00
TK0M 0
0
0
0
0
0
TK09 TK08
NPPM Registers (NPPM)
The NPPM value is exactly 2 times the net correction, in
ppm, required to bring the oscillator to 0ppm error. The value
is the combination of oscillator Initial Correction (IPPM) and
crystal temperature dependent correction (CPPM).
IPPM is used to compensate the oscillator offset at room
temperature and is controlled by the ITR0 and BETA registers.
This value is normally set during room temperature testing.
The CPPM compensates the oscillator frequency fluctuation
over-temperature. It is determined by the temperature (T),
crystal curvature parameter (ALPHA), and crystal turnover
temperature (XT0). T is the result of the temp sensor/ADC
conversion, whose decimal result is 2 times the actual
temperature in Kelvin. ALPHA is from either the ALPHA
(cold) or ALPHAH (hot) register depending on T, and XT0 is
from the XT0 register.
21
FN6668.5
July 10, 2009
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