参数资料
| 型号： | ISL12022MIBZR5421 |
| 厂商： | Intersil |
| 文件页数： | 4/31页 |
| 文件大小： | 0K |
| 描述： | IC RTC/CALENDAR TEMP SNSR 20SOIC |
| 应用说明： | Addressing Power Issues in Real Time Clock Appls |
| 产品培训模块： | Solutions for Industrial Control Applications |
| 标准包装： | 760 |
| 类型： | 时钟/日历 |
| 特点： | 警报器，夏令时，闰年，SRAM |
| 存储容量： | 128B |
| 时间格式： | HH:MM:SS（12/24 小时） |
| 数据格式： | YY-MM-DD-dd |
| 接口： | I²C，2 线串口 |
| 电源电压： | 2.7 V ~ 5.5 V |
| 电压 - 电源，电池： | 1.8 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 20-SOIC |
| 包装： | 管件 |
第1页第2页第3页当前第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页
ISL12022MR5421
12
FN7576.3
June 7, 2012
Functional Description
Power Control Operation
The power control circuit accepts a VDD and a VBAT input. Many
types of batteries can be used with Intersil RTC products. For
example, 3.0V or 3.6V Lithium batteries are appropriate, and battery
sizes are available that can power the ISL12022MR5421 for up to
10 years. Another option is to use a supercapacitor for applications
Section” on page 27 for more information.
Normal Mode (VDD) to Battery Backup Mode
(VBAT)
To transition from the VDD to VBAT mode, both of the following
conditions must be met:
Condition 1:
VDD < VBAT - VBATHYS
where VBATHYS ≈ 50mV
Condition 2:
VDD < VTRIP
where VTRIP ≈ 2.2V
Battery Backup Mode (VBAT) to Normal Mode
(VDD)
The ISL12022MR5421 device will switch from the VBAT to VDD
mode when one of the following conditions occurs:
Condition 1:
VDD > VBAT + VBATHYS
where VBATHYS ≈ 50mV
Condition 2:
VDD > VTRIP + VTRIPHYS
where VTRIPHYS ≈ 30mV
These power control situations are illustrated in Figures 14 and
The I2C bus is deactivated in battery backup mode to reduce
power consumption. Aside from this, all RTC functions are
operational during battery backup mode. Except for SCL and SDA,
all the inputs and outputs of the ISL12022MR5421 are active
during battery backup mode unless disabled via the control
register.
The device Time Stamps the switchover from VDD to VBAT and
VBAT to VDD, and the time is stored in tSV2B and tSB2V registers
respectively. If multiple VDD power-down sequences occur before
the status is read, the earliest VDD to VBAT power-down time is
stored and the most recent VBAT to VDD time is stored.
Temperature conversion and compensation can be enabled in
battery backup mode. Bit BTSE in the BETA register controls this
operation, as described in “BETA Register (BETA)” on page 19.
Power Failure Detection
The ISL12022MR5421 provides a Real Time Clock Failure Bit
(RTCF) to detect total power failure. It allows users to determine if
the device has powered up after having lost all power to the
device (both VDD and VBAT).
Brownout Detection
The ISL12022MR5421 monitors the VDD level continuously and
provides warning if the VDD level drops below prescribed levels.
There are six (6) levels that can be selected for the trip level.
These values are 85% below popular VDD levels. The LVDD bit in
the Status Register will be set to “1” when brownout is detected.
Note that the I2C serial bus remains active unless the Battery
VTRIP levels are reached.
Battery Level Monitor
The ISL12022MR5421 has a built-in warning feature once the
backup battery level drops first to 85% and then to 75% of the
battery’s nominal VBAT level. When the battery voltage drops to
between 85% and 75%, the LBAT85 bit is set in the status
register. When the level drops below 75%, both LBAT85 and
LBAT75 bits are set in the status register.
The battery level monitor is not functional in battery backup
mode. In order to read the monitor bits after powering up VDD,
instigate a battery level measurement by setting the TSE bit to
"1" (BETA register), and then read the bits.
There is a Battery Time Stamp Function available. Once the VDD is
low enough to enable switchover to the battery, the RTC time/date
are written into the TSV2B register. This information can be read
from the TSV2B registers to discover the point in time of the VDD
power-down. If there are multiple power-down cycles before
reading these registers, the first values stored in these registers
will be retained. These registers will hold the original power-down
value until they are cleared by setting CLRTS = 1 to clear the
registers.
VBAT - VBATHYS
VBAT
VBAT + VBATHYS
BATTERY BACKUP
MODE
VDD
VTRIP
2.2V
1.8V
FIGURE 14. BATTERY SWITCHOVER WHEN VBAT < VTRIP
FIGURE 15. BATTERY SWITCHOVER WHEN VBAT > VTRIP
VTRIP
VBAT
VTRIP + VTRIPHYS
BATTERY BACKUP
MODE
VDD
VTRIP
3.0V
2.2V
相关PDF资料 |
PDF描述 |
|---|---|
| ISL12023IVZ | IC RTC/CLDR TEMP SNSR 14-TSSOP |
| ISL12024IRTCZ | IC RTC/CALENDER 64BIT 8-TDFN |
| ISL12024IVZ | IC RTC/CALENDAR EEPROM 8-TSSOP |
| ISL12025IVZ | IC RTC/CALENDAR EEPROM 8-TSSOP |
| ISL12026IBZ-T7A | IC RTC/CALENDAR EEPROM 8SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL12022MIBZ-T | 功能描述:实时时钟 REAL TIME CLK & TEMP COMPENSATED CRYSTAL RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| ISL12022MIBZ-T7A | 功能描述:IC RTC/CALENDAR TEMP SNSR 20SOIC RoHS:否 类别:集成电路 (IC) >> 时钟/计时 - 实时时钟 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- 类型:时钟/日历 特点:警报器，闰年，SRAM 存储容量:- 时间格式:HH:MM:SS（12/24 小时） 数据格式:YY-MM-DD-dd 接口:SPI 电源电压:2 V ~ 5.5 V 电压 - 电源，电池:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-WDFN 裸露焊盘 供应商设备封装:8-TDFN EP 包装:管件 |
| ISL12022MIBZ-TR5421 | 功能描述:实时时钟 REAL TIME CLK W/MFK IMPROVED ESD AIR RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| ISL12022MR5421 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Low Power RTC with Battery Backed SRAM, Integrated 5ppm |
| ISL12022M-R5421 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:High-Accuracy RTC Modules, Feature-Rich RTCs |
发布紧急采购，3分钟左右您将得到回复。