参数资料
| 型号： | ISL1208IU8Z-TK |
| 厂商： | Intersil |
| 文件页数： | 14/24页 |
| 文件大小： | 0K |
| 描述： | IC RTC/CALENDAR I2C 8-MSOP |
| 标准包装： | 1,000 |
| 类型： | 时钟/日历 |
| 特点： | 警报器，闰年，SRAM |
| 存储容量： | 2B |
| 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： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 带卷 (TR) |
21
FN8085.8
September 12, 2008
Combining with Equation 5 gives the equation for backup
time in Equation 8:
where:
CBAT = 0.47F
VBAT2 = 4.7V
VBAT1 = 1.8V
ILKG = 0 (assumed minimal)
TBACKUP = 0.47 * (2.9) / 4.38E-7 = 3.107E6 sec
Since there are 86,400 seconds in a day, this corresponds to
35.96 days. If the 30% tolerance is included for capacitor
and supply current tolerances, then worst case backup time
would be:
CBAT = 0.70 * 35.96 = 25.2 days
Example 2. Calculating a Capacitor Value for a
Given Backup Time
Referring to Figure 21 again, the capacitor value needs to be
calculated to give 2 months (60 days) of backup time, given
VCC = 5.0V. As in Example 1, the VBAT voltage will vary from
4.7V down to 1.8V. We will need to rearrange Equation 5 to
solve for capacitance in Equation 9:
Using the terms described above, this equation becomes
Equation 10:
where:
TBACKUP = 60 days * 86,400 sec/day = 5.18 E6 seconds
IBATAVG = 4.387 E-7 A (same as Example 1)
ILKG = 0 (assumed)
VBAT2 = 4.7V
VBAT1 = 1.8VSolving gives
CBAT = 5.18 E6 * (4.387 E-7)/(2.9) = 0.784F
If the 30% tolerance is included for tolerances, then worst
case capacitor value would be:
TBACKUP = CBAT * (VBAT2 - VBAT1) / (IBATAVG + ILKG)
(EQ. 8)
seconds
CBAT = dT*I/dV
(EQ. 9)
CBAT = TBACKUP * (IBATAVG + ILKG)/(VBAT2 – VBAT1)
(EQ. 10)
(EQ. 11)
C
BAT
1.3
0.784
1.02F
=
×
=
ISL1208
相关PDF资料 |
PDF描述 |
|---|---|
| VI-J44-MZ | CONVERTER MOD DC/DC 48V 25W |
| AD5258BRMZ100 | IC POT DGTL I2C 100K 64P 10MSOP |
| VI-J1Y-MZ | CONVERTER MOD DC/DC 3.3V 16.5W |
| AD5258BRMZ1 | IC POT DGTL I2C1K 64P 10MSOP |
| ISL12008IB8Z-T | IC RTC I2C LO-POWER 8-SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL1209 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Low Power RTC with Battery Backed SRAM and Event Detection |
| ISL1209_06 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Low Power RTC with Battery Backed SRAM and Event Detection |
| ISL1209EVAL | 制造商:Intersil Corporation 功能描述:ISL1209 EVALUATION BOARD - Bulk |
| ISL1209EVALZ | 制造商:Intersil Corporation 功能描述:ISL1209EVALZ (PB-FREE ) EVALUATION BOARD - ROHS COMPLIANT - Rail/Tube |
| ISL1209IP18 | 制造商:Intersil Corporation 功能描述:LOW POWER RTC WITH BATTERY BACKED SRAM PDIP 18 - Rail/Tube |
发布紧急采购，3分钟左右您将得到回复。