 |
数据搜索系统，热门电子元器件搜索 |
|
|
数据搜索系统，热门电子元器件搜索 |
|
ISL12020MIRZ 数据表(PDF) 10 Page - Intersil Corporation |
|
||||||||||||||||||||||||||||||
ISL12020MIRZ 数据表(HTML) 10 Page - Intersil Corporation |
|
|
10 / 32 page  10 FN6667.4 February 11, 2010 General Description The ISL12020M device is a low power real time clock (RTC) with embedded temperature sensor and crystal. It contains crystal frequency compensation circuitry over the operating temperature range good to ±5ppm accuracy. It also contains a clock/calendar with Daylight Savings Time (DST) adjustment, power fail and low battery monitors, brownout indicator, 1 periodic or polled alarm, intelligent battery-backup switching and 128 Bytes of battery-backed user SRAM. The oscillator uses an internal 32.768kHz crystal. The real time clock tracks time with separate registers for hours, minutes and seconds. The device has calendar registers for date, month, year and day of the week. The calendar is accurate through 2099, with automatic leap year correction. In addition, both the ISL12020M could be programmed for automatic Daylight Savings Time (DST) adjustment by entering local DST information. The ISL12020M’s alarm can be set to any clock/calendar value for a match. For example, every minute, every Tuesday or at 5:23 AM on March 21. The alarm status is available by checking the Status Register, or the device can be configured to provide a hardware interrupt via the IRQ/FOUT pin. There is a repeat mode for the alarm allowing a periodic interrupt every minute, every hour, every day, etc. The device also offers a backup power input pin. This VBAT pin allows the device to be backed up by battery or Super Capacitor with automatic switchover from VDD to VBAT. The ISL12020M device is specified for VDD = 2.7V to 5.5V and the clock/calendar portion of the device remains fully operational in battery-backup mode down to 1.8V (Standby Mode). The VBAT level is monitored and reported against preselected levels. The first report is registered when the VBAT level falls below 85% of nominal level, the second level is set for 75%. Battery levels are stored in PWR_VBAT registers. The ISL12020M offers a “Brownout” alarm once the VDD falls below a pre-selected trip level. This allows system Micro to save vital information to memory before complete power loss. There are six VDD levels that could be selected for initiation of the Brownout alarm. 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 ISL12020M for up to 10 years. Another option is to use a Super Capacitor for applications where VDD is interrupted for up to a month. See the “Application 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 ISL12020M 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 12 and 13. FIGURE 10. IDD with TSE = 1 vs TEMPERATURE FIGURE 11. OSCILLATOR CHANGE vs TEMPERATURE AT DIFFERENT AGING SETTINGS (IATR) (BETA SET FOR 1ppm STEPS) Typical Performance Curves Temperature is +25°C unless otherwise specified. (Continued) 40 50 60 70 80 90 100 110 -40 -20 0 2040 6080 TEMPERATURE (°C) VBAT = 2.7V VDD = 3.3V VDD = 5.5V -80 -60 -40 -20 0 20 40 60 80 -40 -20 0 20 40 60 80 TEMPERATURE (°C) 62.5ppm 32ppm 0ppm -31ppm -61.5ppm ISL12020M |
类似零件编号 - ISL12020MIRZ |
|
类似说明 - ISL12020MIRZ |
|
|
链接网址 |
| 隐私政策 |
| ALLDATASHEETCN.COM |
| ALLDATASHEET是否为您带来帮助? [ DONATE ] |
关于 Alldatasheet | 广告服务 | 联系我们 | 隐私政策 | 链接交换 | 制造商名单 All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
Chinese ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
