18 FN6659.3 November 22, 2011 Note that setting the IATR to the lowest settings (-31ppm) with the default 32kHz output can cause the o" />
參數(shù)資料
型號(hào)： ISL12022IBZ-T7A
廠商： Intersil
文件頁(yè)數(shù)： 10/29頁(yè)
文件大小： 0K
描述： IC RTC/CALENDAR TEMP SNSR 8SOIC
應(yīng)用說(shuō)明： Addressing Power Issues in Real Time Clock Appls
產(chǎn)品培訓(xùn)模塊： Solutions for Industrial Control Applications
標(biāo)準(zhǔn)包裝： 250
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： 8-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 8-SOIC
包裝： 帶卷 (TR)
ISL12022
18
FN6659.3
November 22, 2011
Note that setting the IATR to the lowest settings (-31ppm) with
the default 32kHz output can cause the oscillator frequency to
become unstable on power-up. The lowest settings for IATR
should be avoided to insure oscillator frequency integrity. If the
lowest IATR settings are needed, then the user is advised to
disable the FOUT and enable again to insure placing the oscillator
in a stable condition.
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 ISL12022 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 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 the temperature
sensor 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. The total time for
temperature sense and conversion is approximately 22ms from
the time TSE = 1 write is completed.
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 Temperature 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.
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:
11
0101
-21
11
0110
-22
11
0111
-23
11
1000
-24
11
1001
-25
11
1010
-26
11
1011
-27
11
1100
-28
11
1101
-29
11
1110
-30
11
1111
-31
TABLE 13. ALPHA REGISTER
ADDR 7
6
5
432
10
0Ch
D ALPHA6 ALPHA5 ALPHA4 ALPHA3 ALPHA2 ALPHA1 ALPHA0
TABLE 14.
ADDR
7
6
5
4
3210
0Dh
TSE BTSE BTSR BETA4 BETA3 BETA2 BETA1 BETA0
TABLE 12. IATR0 TRIMMING RANGE (Continued)
IATR05 IATR04 IATR03 IATR02 IATR01 IATR00
TRIMMING
RANGE
TABLE 15. 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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