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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
TABLE 12. IATRO TRIMMING RANGE (Continued)
TRIMMING
IATR05 IATR04 IATR03 IATR02 IATR01 IATR00 RANGE
0
1
0
1
1
0
+10
0
1
0
1
1
1
+9
0
1
1
0
0
0
+8
0
1
1
0
0
1
+7
0
1
1
0
1
0
+6
0
1
1
0
1
1
+5
0
1
1
1
0
0
+4
0
1
1
1
0
1
+3
0
1
1
1
1
0
+2
0
1
1
1
1
1
+1
1
0
0
0
0
0
0
1
0
0
0
0
1
-1
1
0
0
0
1
0
-2
1
0
0
0
1
1
-3
1
0
0
1
0
0
-4
1
0
0
1
0
1
-5
1
0
0
1
1
0
-6
1
0
0
1
1
1
-7
1
0
1
0
0
0
-8
1
0
1
0
0
1
-9
1
0
1
0
1
0
-10
1
0
1
0
1
1
-11
1
0
1
1
0
0
-12
1
0
1
1
0
1
-13
1
0
1
1
1
0
-14
1
0
1
1
1
1
-15
1
1
0
0
0
0
-16
1
1
0
0
0
1
-17
1
1
0
0
1
0
-18
1
1
0
0
1
1
-19
1
1
0
1
0
0
-20
1
1
0
1
0
1
-21
1
1
0
1
1
0
-22
1
1
0
1
1
1
-23
1
1
1
0
0
0
-24
1
1
1
0
0
1
-25
1
1
1
0
1
0
-26
1
1
1
0
1
1
-27
1
1
1
1
0
0
-28
1
1
1
1
0
1
-29
1
1
1
1
1
0
-30
1
1
1
1
1
1
-31
ALPHA Register (ALPHA)
TABLE 13. ALPHA REGISTER
ADDR 7
6
5
4
3
2
1
0
0Ch D ALPHA6 ALPHA5 ALPHA4 ALPHA3 ALPHA2 ALPHA1 ALPHA0
The ALPHA variable is 8 bits and is defined as the
temperature coefficient of crystal from -40°C to T0, or the
ALPHA Cold (there is an Alpha Hot register that must be
programmed as well). It is normally given in units of ppm/°C2,
with a typical value of -0.034. The ISL12022M device uses a
scaled version of the absolute value of this coefficient in order
to get an integer value. Therefore, ALPHA <7:0> is defined as
the (|Actual ALPHA Value| x 2048) and converted to binary.
For example, a crystal with Alpha of -0.034ppm/°C2 is first
scaled (|2048*(-0.034)| = 70d) and then converted to a binary
number of 01000110b.
The practical range of Actual ALPHA values is from
-0.020 to -0.060.
The ISL12022M has a preset ALPHA value corresponding to
the crystal in the module. This value is recalled on initial
power-up and is preset in device production. It is READ
ONLY and cannot be overwritten by the user.
BETA Register (BETA)
TABLE 14.
ADDR 7 6
5
4
3
2
1
0
0Dh TSE BTSE BTSR BETA4 BETA3 BETA2 BETA1 BETA0
The BETA register has special Write properties. Only the
TSE, BTSE and BTSR bits can be written; the BETA bits
are READ-ONLY. A write to both bytes in this register
will only change the 3 MSB’s (TSE, BTSE, BTSR), and
the 5 LSB’s will remain the same as set at the factory.
TEMPERATURE SENSOR ENABLED BIT (TSE)
This bit enables the Temperature Sensing operation, including
the temperature sensor, A/D converter and FATR/FDTR
register adjustment. The default mode after power-up is
disabled:
(TSE = 0). To enable the operation, TSE should be set to 1.
(TSE = 1). When temp sense is disabled, the initial values for
IATR and IDTR registers are used for frequency control.
When TSE is set to 1, the temperature conversion cycle begins
and will end when two temperature conversions are completed.
The average of the two conversions is in the TEMP registers.
TEMP SENSOR CONVERSION IN BATTERY MODE BIT
(BTSE)
This bit enables the Temperature Sensing and Correction in
battery mode. BTSE = 0 (default) no conversion, Temp Sensing
or Compensation in battery mode. BTSE = 1 indicates Temp
Sensing and Compensation enabled in battery mode. The
BTSE is disabled when the battery voltage is lower than 2.7V.
No temperature compensation will take place with VBAT<2.7V.
FREQUENCY OF TEMPERATURE SENSING AND
CORRECTION BIT (BTSR)
This bit controls the frequency of Temp Sensing and
Correction. BTSR = 0 default mode is every 10 minutes,
BTSR = 1 is every 1.0 minute. Note that BTSE has to be
enabled in both cases. See Table 15.
17
FN6668.5
July 10, 2009
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