công cụ tìm kiếm bảng dữ liệu linh kiện điện tử
  Vietnamese  ▼
ALLDATASHEET.VN

X  

ISL12022M bảng dữ liệu(PDF) 11 Page - Intersil Corporation

tên linh kiện ISL12022M
Giải thích chi tiết về linh kiện  Low Power RTC with Battery Backed SRAM,Integrated 짹5ppm Temperature Compensation and Auto Daylight Saving
Download  31 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
nhà sản xuất  INTERSIL [Intersil Corporation]
Trang chủ  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL12022M bảng dữ liệu(HTML) 11 Page - Intersil Corporation

Back Button ISL12022M Datasheet HTML 7Page - Intersil Corporation ISL12022M Datasheet HTML 8Page - Intersil Corporation ISL12022M Datasheet HTML 9Page - Intersil Corporation ISL12022M Datasheet HTML 10Page - Intersil Corporation ISL12022M Datasheet HTML 11Page - Intersil Corporation ISL12022M Datasheet HTML 12Page - Intersil Corporation ISL12022M Datasheet HTML 13Page - Intersil Corporation ISL12022M Datasheet HTML 14Page - Intersil Corporation ISL12022M Datasheet HTML 15Page - Intersil Corporation Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 31 page
background image
11
FN6668.7
June 4, 2010
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 ISL12022M for up to 10 years.
Another option is to use a supercapacitor for applications
where VDD is interrupted for up to a month. See the
“Application Section” on page 26 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 ISL12022M 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.
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 ISL12022M 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 ISL12022M 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 ISL12022M 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 ISL12022M 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
VBAT - VBATHYS
VBAT
VBAT + VBATHYS
BATTERY BACKUP
MODE
VDD
VTRIP
2.2V
1.8V
FIGURE 12. BATTERY SWITCHOVER WHEN
VBAT <VTRIP
FIGURE 13. BATTERY SWITCHOVER WHEN VBAT >
VTRIP
VTRIP
VBAT
VTRIP + VTRIPHYS
BATTERY BACKUP
MODE
VDD
VTRIP
3.0V
2.2V
ISL12022M


Số phần tương tự - ISL12022M

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
logo
Intersil Corporation
ISL12022M INTERSIL-ISL12022M Datasheet
376Kb / 27P
   Real Time Clock with Embedded Crystal, 짹5ppm Accuracy
ISL12022M INTERSIL-ISL12022M Datasheet
387Kb / 27P
   Low Power RTC with Battery Backed SRAM, Integrated 짹5ppm Temperature Compensation, and Auto Daylight Saving
ISL12022M INTERSIL-ISL12022M Datasheet
768Kb / 6P
   High-Accuracy RTC Modules, Feature-Rich RTCs
ISL12022M INTERSIL-ISL12022M Datasheet
9Mb / 44P
   Providing high-performance solutions for every link in the signal chain
ISL12022M INTERSIL-ISL12022M Datasheet
4Mb / 20P
   Intersil?셲 Solutions for Industrial Process Control
More results

Mô tả tương tự - ISL12022M

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
logo
Intersil Corporation
ISL12022MIBZ-T7A INTERSIL-ISL12022MIBZ-T7A Datasheet
900Kb / 31P
   Low Power RTC with Battery Backed SRAM, Integrated 짹5ppm Temperature Compensation and Auto Daylight Saving
ISL12020M INTERSIL-ISL12020M Datasheet
476Kb / 32P
   Low Power RTC with Battery Backed SRAM, Integrated 짹5ppm Temperature Compensation and Auto Daylight Saving
logo
Renesas Technology Corp
ISL12022MA RENESAS-ISL12022MA Datasheet
1Mb / 31P
   Low Power RTC with Battery Backed SRAM, Integrated 짹5ppm Temperature Compensation and Auto Daylight Saving
ISL12022MR5421 RENESAS-ISL12022MR5421 Datasheet
1Mb / 31P
   Low Power RTC with Battery Backed SRAM, Integrated 짹5ppm Temperature Compensation and Auto Daylight Saving
ISL12020M RENESAS-ISL12020M Datasheet
1Mb / 34P
   Low Power RTC with Battery Backed SRAM, Integrated 짹5ppm Temperature Compensation and Auto Daylight Saving
logo
Intersil Corporation
ISL12022MA INTERSIL-ISL12022MA_10 Datasheet
866Kb / 29P
   Low Power RTC with Battery Backed SRAM, Integrated 짹5ppm Temperature Compensation and Auto Daylight Saving
ISL12020MIRZ-T7A INTERSIL-ISL12020MIRZ-T7A Datasheet
633Kb / 34P
   Low Power RTC with Battery Backed SRAM, Integrated 짹5ppm Temperature Compensation and Auto Daylight Saving
ISL12022M INTERSIL-ISL12022M_09 Datasheet
387Kb / 27P
   Low Power RTC with Battery Backed SRAM, Integrated 짹5ppm Temperature Compensation, and Auto Daylight Saving
logo
Renesas Technology Corp
ISL12022M RENESAS-ISL12022M Datasheet
1Mb / 32P
   Low Power RTC with Battery Backed SRAM, Integrated 짹5ppm Temperature Compensation and Auto Daylight Saving
logo
Intersil Corporation
ISL12023 INTERSIL-ISL12023 Datasheet
389Kb / 28P
   Low Power RTC with Battery-Backed SRAM and Embedded Temp Compensation 짹5ppm with Auto Daylight Saving
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 25 26 27 28 29 30 31


bảng dữ liệu tải về

Go To PDF Page


Link URL




Chính sách bảo mật
ALLDATASHEET.VN
Cho đến nay ALLDATASHEET có giúp ích cho doanh nghiệp của bạn hay không?  [ DONATE ] 

Alldatasheet là   |   Quảng cáo   |   Liên lạc với chúng tôi   |   Chính sách bảo mật   |   Trao đổi link   |   Tìm kiếm theo nhà sản xuất
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