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參數(shù)資料
| 型號： | ISL12026AIVZ |
| 廠商： | Intersil |
| 文件頁數(shù)： | 14/24頁 |
| 文件大小： | 0K |
| 描述： | IC RTC/CALENDAR EEPROM 8-TSSOP |
| 標準包裝： | 960 |
| 類型： | 時鐘/日歷 |
| 特點： | 警報器，閏年 |
| 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： | 8-TSSOP（0.173"，4.40mm 寬） |
| 供應商設備封裝： | 8-TSSOP |
| 包裝： | 管件 |
21
FN8231.9
November 30, 2010
circuits in less than one second. Some circuits may take
slightly longer, but start-up should definitely occur in less
than 5 seconds. When testing RTC circuits, the most
common impulse is to apply a scope probe to the circuit at
the X2 pin (oscillator output) and observe the waveform. DO
NOT DO THIS! Although in some cases you may see a
usable waveform, due to the parasitics (usually 10pF to
ground) applied with the scope probe, there will be no useful
information in that waveform other than the fact that the
circuit is oscillating. The X2 output is sensitive to capacitive
impedance so the voltage levels and the frequency will be
affected by the parasitic elements in the scope probe.
Applying a scope probe can possibly cause a faulty oscillator
to start up, hiding other issues (although in the Intersil RTCs,
the internal circuitry assures start-up when using the proper
crystal and layout).
The best way to analyze the RTC circuit is to power it up and
read the real time clock as time advances, or if the chip has
the IRQ/FOUT output, look at the output of that pin on an
oscilloscope (after enabling it with the control register, and
using a pull-up resistor for an open-drain output).
Alternatively, the ISL12026 device has an IRQ/FOUT output,
which can be checked by setting an alarm for each minute.
Using the pulse interrupt mode setting, the once-per-minute
interrupt functions as an indication of proper oscillation.
Backup Battery Operation
Many types of batteries can be used with the Intersil RTC
products. 3.0V or 3.6V Lithium batteries are appropriate, and
sizes are available that can power a Intersil RTC device for
up to 10 years. Another option is to use a SuperCap for
applications where VDD may disappear intermittently for
short periods of time. Depending on the value of SuperCap
used, backup time can last from a few days to two weeks
(with >1F). A simple silicon or Schottky barrier diode can be
used in series with VDD to charge the SuperCap, which is
connected to the VBAT pin. Try to use Schottky diodes with
very low leakages, <1A desirable. Do not use the diode to
charge a battery (especially lithium batteries!)
There are two possible modes for battery backup operation;
Standard and Legacy mode. In Standard mode, there are no
operational concerns when switching over to battery backup
since all other devices functions are disabled. Battery drain
is minimal in Standard mode, and return to Normal VDD
powered operations is predictable. In Legacy mode, the
VBAT pin can power the chip if the voltage is above VDD and
less than VTRIP. In this mode, it is possible to generate the
alarm and communicate with the device, unless SBI = 1, but
the supply current drain is much higher than the Standard
mode and backup time is reduced. In this case, if alarms are
used in backup mode, the IRQ/FOUT pull-up resistor must be
connected to VBAT voltage source.
Alarm Operation Examples
Following are examples of both Single Event and periodic
Interrupt Mode alarms.
EXAMPLE 1
Alarm 0 set with single interrupt (IM = ”0”)
A single alarm will occur on January 1 at 11:30am.
A. Set Alarm 0 registers as follows:
B. Also the AL0E bit must be set as follows:
After these registers are set, an alarm will be generated when
the RTC advances to exactly 11:30am on January 1 (after
seconds changes from 59 to 00) by setting the AL0 bit in the
status register to “1” and also bringing the IRQ/FOUT output low.
EXAMPLE 2
Pulsed interrupt once per minute (IM = ”1”)
Interrupts at one minute intervals when the seconds register
is at 30 seconds.
A. Set Alarm 0 registers as follows:
B. Set the Interrupt register as follows:
ALARM0
REGISTER
BIT
DESCRIPTION
7
6543210
HEX
SCA0
0
0000000
00h
Seconds disabled
MNA0
1
0110000
B0h
Minutes set to 30,
enabled
HRA0
1
0010001
91h
Hours set to 11,
enabled
DTA0
1
0000001
81h
Date set to 1,
enabled
MOA0
1
0000001
81h
Month set to 1,
enabled
DWA0
0
0000000
00h
Day of week
disabled
CONTROL
REGISTER
BIT
DESCRIPTION
765
43210
HEX
INT
001
00000
x0hEnable Alarm
FIGURE 24. SUPERCAPACITOR CHARGING CIRCUIT
VDD
VBAT
VSS
SUPERCAP
2.7V TO 5.5V
ISL12026, ISL12026A
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|---|---|
| ISL12026AIVZ-T | 功能描述:實時時鐘 REAL TIME CLK/CLNDR W/EEPROM IN 8LD 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: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| ISL12026AW | 制造商:Intersil Corporation 功能描述:INKED WAFER SALE, BACKLAP TO 8 MILS, NO INSPECTION REQ. - Rail/Tube |
| ISL12026IBZ | 功能描述:實時時鐘 REAL TIME CLOCK/CALE NDARW/ EEPROM IN 8LD 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: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| ISL12026IBZ-T | 功能描述:實時時鐘 REAL TIME CLK/CLNDR W/EEPROM IN 8LD 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: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| ISL12026IBZ-T7A | 功能描述:實時時鐘 REAL TIME CLK/CLNDR W/EEPROM IN 8LD 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: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
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