数据搜索系统,热门电子元器件搜索
  Chinese  ▼
ALLDATASHEETCN.COM

X  

ISL1208IRT8Z-TK 数据表(PDF) 9 Page - Intersil Corporation

部件名 ISL1208IRT8Z-TK
功能描述  Low Power RTC with Battery Backed SRAM
Download  24 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  INTERSIL [Intersil Corporation]
网页  http://www.intersil.com/cda/home
标志 INTERSIL - Intersil Corporation

ISL1208IRT8Z-TK 数据表(HTML) 9 Page - Intersil Corporation

Back Button ISL1208IRT8Z-TK Datasheet HTML 5Page - Intersil Corporation ISL1208IRT8Z-TK Datasheet HTML 6Page - Intersil Corporation ISL1208IRT8Z-TK Datasheet HTML 7Page - Intersil Corporation ISL1208IRT8Z-TK Datasheet HTML 8Page - Intersil Corporation ISL1208IRT8Z-TK Datasheet HTML 9Page - Intersil Corporation ISL1208IRT8Z-TK Datasheet HTML 10Page - Intersil Corporation ISL1208IRT8Z-TK Datasheet HTML 11Page - Intersil Corporation ISL1208IRT8Z-TK Datasheet HTML 12Page - Intersil Corporation ISL1208IRT8Z-TK Datasheet HTML 13Page - Intersil Corporation Next Button
Zoom Inzoom in Zoom Outzoom out
 9 / 24 page
background image
9
FN8085.8
September 12, 2008
the ISL1208 for up to 10 years. Another option is to use a
Super Cap for applications where VDD is interrupted for up
to a month. See the “Application Section” on page 18 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 ISL1208 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 9
and 10.
The I2C bus is deactivated in battery backup mode to provide
lower power. Aside from this, all RTC functions are
operational during battery backup mode. Except for SCL and
SDA, all the inputs and outputs of the ISL1208 are active
during battery backup mode unless disabled via the control
register. The User SRAM is operational in battery backup
mode down to 2V.
Power Failure Detection
The ISL1208 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).
Low Power Mode
The normal power switching of the ISL1208 is designed to
switch into battery backup mode only if the VDD power is
lost. This will ensure that the device can accept a wide range
of backup voltages from many types of sources while reliably
switching into backup mode. Another mode, called Low
Power Mode, is available to allow direct switching from VDD
to VBAT without requiring VDD to drop below VTRIP. Since
the additional monitoring of VDD vs VTRIP is no longer
needed, that circuitry is shut down and less power is used
while operating from VDD. Power savings are typically
600nA at VDD = 5V. Low Power Mode is activated via the
LPMODE bit in the control and status registers.
Low Power Mode is useful in systems where VDD is normally
higher than VBAT at all times. The device will switch from
VDD to VBAT when VDD drops below VBAT, with about 50mV
of hysteresis to prevent any switchback of VDD after
switchover. In a system with a VDD = 5V and backup lithium
battery of VBAT = 3V, Low Power Mode can be used.
However, it is not recommended to use Low Power Mode in
a system with VDD = 3.3V ±10%, VBAT ≥ 3.0V, and when
there is a finite I-R voltage drop in the VDD line.
InterSeal™ Battery Saver
The ISL1208 has the InterSeal™ Battery Saver which
prevents initial battery current drain before it is first used. For
example, battery-backed RTCs are commonly packaged on
a board with a battery connected. In order to preserve
battery life, the ISL1208 will not draw any power from the
battery source until after the device is first powered up from
the VDD source. Thereafter, the device will switchover to
battery backup mode whenever VDD power is lost.
Real Time Clock Operation
The Real Time Clock (RTC) uses an external 32.768kHz quartz
crystal to maintain an accurate internal representation of
second, minute, hour, day of week, date, month, and year. The
RTC also has leap-year correction. The clock also corrects for
months having fewer than 31 days and has a bit that controls
24-hour or AM/PM format. When the ISL1208 powers up after
the loss of both VDD and VBAT, the clock will not begin
incrementing until at least one byte is written to the clock
register.
VBAT - VBATHYS
VBAT
VBAT + VBATHYS
BATTERY BACKUP
MODE
VDD
VTRIP
2.2V
1.8V
FIGURE 9. BATTERY SWITCHOVER WHEN VBAT < VTRIP
FIGURE 10. BATTERY SWITCHOVER WHEN VBAT > VTRIP
VTRIP
VBAT
VTRIP + VTRIPHYS
BATTERY BACKUP
MODE
VDD
VTRIP
3.0V
2.2V
ISL1208


类似零件编号 - ISL1208IRT8Z-TK

制造商部件名数据表功能描述
logo
Renesas Technology Corp
ISL1208IRT8Z-TK RENESAS-ISL1208IRT8Z-TK Datasheet
1,010Kb / 24P
   I2C Real Time Clock/Calendar, Low Power RTC with Battery Backed SRAM
ISL1208IRT8Z-TK RENESAS-ISL1208IRT8Z-TK Datasheet
1Mb / 25P
   I2C Real Time Clock/Calendar, Low Power RTC with Battery Backed SRAM
Jul 15, 2022
More results

类似说明 - ISL1208IRT8Z-TK

制造商部件名数据表功能描述
logo
Intersil Corporation
ISL1218 INTERSIL-ISL1218 Datasheet
351Kb / 21P
   Low Power RTC with Battery Backed SRAM
ISL1208 INTERSIL-ISL1208_06 Datasheet
348Kb / 21P
   Low Power RTC with Battery Backed SRAM
logo
Renesas Technology Corp
ISL1218 RENESAS-ISL1218 Datasheet
883Kb / 21P
   Low Power RTC with Battery Backed SRAM
logo
Intersil Corporation
ISL12022MR5421 INTERSIL-ISL12022MR5421 Datasheet
401Kb / 29P
   Low Power RTC with Battery Backed SRAM, Integrated 5ppm
ISL1221 INTERSIL-ISL1221 Datasheet
649Kb / 24P
   Low Power RTC with Battery Backed
ISL1209 INTERSIL-ISL1209 Datasheet
416Kb / 24P
   Low Power RTC with Battery Backed SRAM and Event Detection
ISL1219 INTERSIL-ISL1219 Datasheet
643Kb / 24P
   Low Power RTC with Battery Backed SRAM and Event Detection
ISL1209 INTERSIL-ISL1209_06 Datasheet
358Kb / 24P
   Low Power RTC with Battery Backed SRAM and Event Detection
logo
Renesas Technology Corp
ISL1219 RENESAS-ISL1219 Datasheet
994Kb / 24P
   Low Power RTC with Battery Backed SRAM and Event Detection
ISL1209 RENESAS-ISL1209 Datasheet
998Kb / 25P
   Low Power RTC with Battery Backed SRAM and Event Detection
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24


数据表 下载

Go To PDF Page


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


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
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