ISL12022 INTERSIL [Intersil Corporation], ISL12022 Datasheet - Page 21

• Manufacturer Part Number: ISL12022
• Manufacturer: INTERSIL [Intersil Corporation]

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
• Bits 3, 4, 5 contain the Week of the Month information that
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 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).
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.
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
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ISL12022
• Bits 3, 4, 5 contain the Week of the Month information that
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 (°C) by first converting from binary to
decimal, dividing by 2, and then subtracting 273d, as shown
in Equation 4:
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.
NPPM Registers (NPPM)
The NPPM value is exactly 2x the net correction 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, which are fixed during factor test.
Temperature in °C
TEMP
TK0M
default for the DST Reverse Day of the Week is 00h
(normally Sunday).
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.
TK0L
TK07 TK06 TK05 TK04 TK03 TK02 TK01 TK00
0
7
=
0
6
[(TK <9:0>)/2] - 273
0
5
TABLE 22.
0
4
0
3
0
2
TK09 TK08
1
June 23, 2009
FN6659.2
(EQ. 4)
0