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參數(shù)資料
| 型號(hào)： | ISL12030IBZ |
| 廠商： | Intersil |
| 文件頁數(shù)： | 7/17頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC RTC/CALENDAR EEPROM 8-SOIC |
| 產(chǎn)品培訓(xùn)模塊： | Solutions for Industrial Control Applications |
| 標(biāo)準(zhǔn)包裝： | 980 |
| 類型： | 時(shí)鐘/日歷 |
| 特點(diǎn)： | 警報(bào)器，夏令時(shí)，SRAM |
| 存儲(chǔ)容量： | 128B |
| 時(shí)間格式： | HH:MM:SS:hh（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 |
| 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： | 管件 |
15
FN6617.2
May 5, 2011
Application Section
AC Input Circuits
The AC input ideally will have a 2.5VP-P sine wave at the
input, so this is the target for any signal conditioning circuitry
for the 50/60Hz waveform. Note that the peak-to-peak
amplitude can range from 1VP-P up to VDD, although it is
best to keep the max signal level just below VDD. The AC
input provides DC offset so AC coupling with a series
capacitor is advised.
If the AC power supply has a transformer, the secondary
output can be used for clocking with a resistor divider and
series AC coupling capacitor. A sample circuit is shown in
peak-to-peak range on the secondary voltage in order to
match the input of the ISL12030. CIN can be sized to pass
up to 300Hz or so, and in most cases, 0.47F should be the
selected value for a ±20% tolerance device.
The AC input to the ISL12030 can be damaged if subjected
to a normal AC waveform when VDD is powered down. This
can happen in circuits where there is a local LDO or power
switch for placing circuitry in standby, while the AC main is
still switched ON. Figure 8 shows a modified version of the
Figure 9 circuit, which uses an emitter follower to essentially
turn off the AC input waveform if the VDD supply goes down.
Adding a Super Capacitor Backup
Since any loss of VDD power will reset the SRAM memory
including control and RTC register sections, then having
connections for a super capacitor backup using VDD for the
normal source and a signal diode for charging. Be careful
not to use a normal Schottky diode as the leakage will
greatly reduce the backup life of the super capacitor.
This form of backup should yield at least one full day of
backup time, assuming the SCL/SDA pins and their pull-ups
are pulled to ground on powerdown.
FIGURE 8. AC INPUT USING A TRANSFORMER SECONDARY
ISL12030
120VAC
50/60Hz
VIN (AC) = 1.5VP-P TO 5VP-P
R1
R2
CIN
FIGURE 9. USING THE VDD SUPPLY TO GATE THE AC INPUT
ISL12030
120VAC
50/60Hz
VIN (AC) = 1.5VP-P TO VDD (MAX)
R1
R2
CIN
VDD
C1
ISL12030
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| ISL12030IBZ-T | 功能描述:實(shí)時(shí)時(shí)鐘 REAL TIME CLK W/ EEPROM 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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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 |
| ISL12032 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Low Power RTC with Battery Backed SRAM and 50/60 Cycle AC Input and Xtal Back-up |
| ISL12032IVZ | 功能描述:實(shí)時(shí)時(shí)鐘 REAL TIME CLK W/ EEPROM 14LD 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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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 |
| ISL12032IVZ-T | 功能描述:實(shí)時(shí)時(shí)鐘 REAL TIME CLK W/ EEPROM 14LD 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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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 |
| ISL12057 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Low Cost and Low Power I2C RTC Real Time Clock/Calendar |
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