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| 型號： | ISL12022MIBZR5421 |
| 廠商： | Intersil |
| 文件頁數(shù)： | 21/31頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC RTC/CALENDAR TEMP SNSR 20SOIC |
| 應(yīng)用說明： | 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： | 760 |
| 類型： | 時鐘/日歷 |
| 特點： | 警報器，夏令時，閏年，SRAM |
| 存儲容量： | 128B |
| 時間格式： | HH:MM:SS（12/24 小時） |
| 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： | 20-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-SOIC |
| 包裝： | 管件 |
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ISL12022MR5421
28
FN7576.3
June 7, 2012
The best way to run clock lines around the RTC is to stay outside
of the ground ring by at least a few millimeters. Also, use the
VBAT and VDD as guard ring lines as well, they can isolate clock
lines from the oscillator section. In addition, if the IRQ/FOUT pin
is used as a clock, it should be routed away from the RTC device
as well.
Measuring Oscillator Accuracy
The best way to analyze the ISL12022MR5421 frequency
accuracy is to set the IRQ/FOUT pin for a specific frequency, and
look at the output of that pin on a high accuracy frequency
counter (at least 7 digits accuracy). Note that the IRQ/FOUT is an
drain output and will require a pull-up resistor.
Using the 1.0Hz output frequency is the most convenient as the
ppm error is expressed in Equation 6:
Other frequencies may be used for measurement but the error
calculation becomes more complex. Use the FOUT output and a
frequency counter for the most accurate results. Also, when the
proper layout guidelines above are observed, the oscillator
should start-up in most circuits in less than one second.
Temperature Compensation Operation
The ISL12022MR5421 temperature compensation feature
needs to be enabled by the user. This must be done in a specific
order as follows.
1. Read register 0Dh, the BETA register. This register contains
the 5-bit BETA trimmed value, which is automatically loaded
on initial power-up. Mask off the 5 LSB’s of the value just
read.
2. Bit 7 of the BETA register is the master enable control for
temperature sense operation. Set this to “1” to allow
continuous temperature frequency correction. Frequency
correction will then happen every 60 seconds with VDD
applied.
3. Bits 5 and 6 of the BETA register control temperature
compensation in battery backup mode (see Table 16). Set the
values for the operation desired.
4. Write back to register 0Dh making sure not to change the 5
LSB values, and include the desired compensation control
bits.
Note that every time the BETA register is written with the TSE bit
= 1, a temperature compensation cycle is instigated and a new
correction value will be loaded into the FATR/FDTR registers (if
the temperature changed since the last conversion).
Also note that registers 0Bh and 0Ch, the ITR0 and ALPHA registers,
are READ-ONLY, and cannot be written to. Also the value for BETA is
locked and cannot be changed with a write. However, It is still a good
idea to do the bit masking when doing TSE bit changes.
Daylight Savings Time (DST) Example
DST involves setting the forward and back times and allowing the
RTC device to automatically advance the time or set the time
back. This can be done for current year, and future years. Many
regions have DST rules that use standard months, weeks and
time of the day, which permit a pre-programmed, permanent
setting.
Table 29 shows an example setup for the ISL12022MR5421.
FIGURE 22. READ SEQUENCE (CSR SLAVE ADDRESS SHOWN)
SIGNALS
FROM THE
MASTER
SIGNALS FROM
THE SLAVE
SIGNAL AT
SDA
S
T
A
R
T
IDENTIFICATION
BYTE WITH
R/W = 0
ADDRESS
BYTE
A
C
K
A
C
K
0
S
T
O
P
A
C
K
1
IDENTIFICATION
BYTE WITH
R/W = 1
A
C
K
S
T
A
R
T
LAST READ
DATA BYTE
FIRST READ
DATA BYTE
A
C
K
10
1
1111
10
1
11 11
FIGURE 23. SUGGESTED LAYOUT FOR THE ISL12022MR5421
FOUT
SCL
SDA
GROUND
RING
ppm error
F
OUT
11e6
–
=
(EQ. 6)
TABLE 29. DST EXAMPLE
VARIABLE
VALUE
REGISTER
VALUE
Month Forward and DST
Enable
April
15h
84h
Week and Day Forward and
select Day/Week, not Date
1st Week and
Sunday
16h
48h
Date Forward
not used
17h
00h
Hour Forward
2am
18h
02h
Month Reverse
October
19h
10h
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|---|---|
| ISL12022MIBZ-T | 功能描述:實時時鐘 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/計時 - 實時時鐘 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: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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