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參數(shù)資料
| 型號： | ISL12022MIBZR5421 |
| 廠商： | INTERSIL CORP |
| 元件分類： | 時鐘/數(shù)據(jù)恢復(fù)及定時提取 |
| 英文描述： | REAL TIME CLOCK, PDSO20 |
| 封裝： | ROHS COMPLIANT, PLASTIC, MS-013AC, SOIC-20 |
| 文件頁數(shù)： | 11/29頁 |
| 文件大?。?/td> | 395K |
| 代理商： | ISL12022MIBZR5421 |
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ISL12022MR5421
19
FN7576.1
June 4, 2010
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
ISL12022MR5421 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 ISL12022MR5421 has a preset ALPHA value
corresponding to the crystal in the module. This value
is recalled on initial power-up and is preset in
be overwritten by the user.
BETA Register (BETA)
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.
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
expressed in Equation 1:
For the 10 minute temperature period the average
current is expressed 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
is tested at two AT settings as follows:
BETA VALUES = (AT(max) - AT (min))/63, where:
AT(max) = FOUT in ppm (at AT = 00H) and
TABLE 13. ALPHA REGISTER
ADDR
7
654
3210
0Ch
D
ALPHA6 ALPHA5 ALPHA4 ALPHA3 ALPHA2 ALPHA1 ALPHA0
TABLE 14.
ADDR 7
6
5
4
3
2
1
0
0Dh
TSE BTSE BTSR BETA4 BETA3 BETA2 BETA1 BETA0
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)
ISL12022MR5421
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL12022MIBZ-T | 功能描述:實(shí)時時鐘 REAL TIME CLK & TEMP COMPENSATED CRYSTAL RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| ISL12022MIBZ-T7A | 功能描述:IC RTC/CALENDAR TEMP SNSR 20SOIC RoHS:否 類別:集成電路 (IC) >> 時鐘/計(jì)時 - 實(shí)時時鐘 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:時鐘/日歷 特點(diǎn):警報器，閏年，SRAM 存儲容量:- 時間格式:HH:MM:SS（12/24 小時） 數(shù)據(jù)格式:YY-MM-DD-dd 接口:SPI 電源電壓:2 V ~ 5.5 V 電壓 - 電源，電池:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-TDFN EP 包裝:管件 |
| ISL12022MIBZ-TR5421 | 功能描述:實(shí)時時鐘 REAL TIME CLK W/MFK IMPROVED ESD AIR RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| ISL12022MR5421 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Low Power RTC with Battery Backed SRAM, Integrated 5ppm |
| ISL12022M-R5421 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:High-Accuracy RTC Modules, Feature-Rich RTCs |
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