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| 型號(hào)： | ISL12023IVZ |
| 廠商： | Intersil |
| 文件頁數(shù)： | 9/29頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC RTC/CLDR TEMP SNSR 14-TSSOP |
| 產(chǎn)品培訓(xùn)模塊： | Solutions for Industrial Control Applications |
| 標(biāo)準(zhǔn)包裝： | 960 |
| 類型： | 時(shí)鐘/日歷 |
| 特點(diǎn)： | 警報(bào)器，夏令時(shí)，閏年，SRAM |
| 存儲(chǔ)容量： | 128B |
| 時(shí)間格式： | HH:MM:SS（12/24 小時(shí)） |
| 數(shù)據(jù)格式： | YY-MM-DD-dd |
| 接口： | I²C，2 線串口 |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 電壓 - 電源，電池： | 1.8 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 14-TSSOP |
| 包裝： | 管件 |
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ISL12023
17
FN6682.3
December 6, 2011
ALPHA Register (ALPHA)
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 ISL12023 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
The practical range of Actual Alpha values is from
-0.020 to -0.060.
The ALPHA register should only be changed while the TSE (Temp
Sense Enable) bit is “0”. Note that both the ALPHA and the
ALPHA Hot registers need to be programmed with values for full
range temperature compensation.
BETA Register (BETA)
TEMPERATURE SENSOR ENABLED BIT (TSE)
This bit enables the Temperature Sensing operation, including the
temperature sensor, A/D converter and AT/DT 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 temperature
sense is disabled, the initial values for IATR and IDTR registers are
used for frequency control.
All changes to the IDTR, IATR, ALPHA and BETA registers must be
made with TSE = 0. After loading the new values, TSE can be
enabled and the new values are used. 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 16.
The temperature measurement conversion time is the same for
battery mode as for VDD mode, approximately 22ms. The battery
mode current will increase during this conversion time to
typically 68A. The average increase in battery current is much
lower than this due to the small duty cycle of the ON-time versus
OFF-time for the conversion.
To figure the average increase in battery current, we take the
change in current times the duty cycle. For the 1 minute
temperature period the average current is shown in Equation 1:
For the 10 minute temperature period the average current is
shown in Equation 2:
If the application has a stable temperature environment that
doesn’t change quickly, the 10 minute option will work well and
the backup battery lifetime impact is minimized. If quick
temperature variations are expected (multiple cycles of more
than 10° within an hour), then the 1 minute option should be
considered and the slightly higher battery current figured into
overall battery life.
GAIN FACTOR OF AT BIT (BETA<4:0>)
Beta is specified to take care of the Cm variations of the crystal.
Most crystals specify Cm around 2.2fF. For example, if Cm > 2.2fF,
the actual AT steps may reduce from 1ppm/step to approximately
0.80ppm/step. Beta is then used to adjust for this variation and
restore the step size to 1ppm/step.
BETA values are limited in the range from 01000 to 11111 as
settings as follows:
BETA VALUES = (AT(max) - AT(min))/63, where:
AT(max) = FOUT in ppm (at AT = 00H) and
AT(min) = FOUT in ppm (at AT = 3FH).
The BETA VALUES result is indexed in the right hand column and
the resulting Beta factor (for the register) is in the same row in
the left column.
TABLE 14. ALPHA REGISTER
ADDR
7
6543210
0Ch
D
ALPHA
6
ALPHA
5
ALPHA
4
ALPHA
3
ALPHA
2
ALPHA
1
ALPHA
0
TABLE 15.
ADDR
7
6
5
4
32
10
0Dh
TSE
BTSE BTSR BETA4 BETA3 BETA2 BETA1 BETA0
TABLE 16. FREQUENCY OF TEMPERATURE SENSING AND
CORRECTION BIT
BTSE
BTSR
TC PERIOD IN
BATTERY MODE
00
OFF
01
OFF
10
10 Minutes
11
1 Minute
ΔI
BAT
0.022s
60s
------------------
=
68
μA 250nA
=
×
(EQ. 1)
ΔI
BAT
0.022s
600s
------------------
=
68
μA 25nA
=
×
(EQ. 2)
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