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

X  

ISL12027IB27Z-T 数据表(PDF) 9 Page - Intersil Corporation

部件名 ISL12027IB27Z-T
功能描述  Real Time Clock/Calendar with EEPROM
Download  28 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

ISL12027IB27Z-T 数据表(HTML) 9 Page - Intersil Corporation

Back Button ISL12027IB27Z-T Datasheet HTML 5Page - Intersil Corporation ISL12027IB27Z-T Datasheet HTML 6Page - Intersil Corporation ISL12027IB27Z-T Datasheet HTML 7Page - Intersil Corporation ISL12027IB27Z-T Datasheet HTML 8Page - Intersil Corporation ISL12027IB27Z-T Datasheet HTML 9Page - Intersil Corporation ISL12027IB27Z-T Datasheet HTML 10Page - Intersil Corporation ISL12027IB27Z-T Datasheet HTML 11Page - Intersil Corporation ISL12027IB27Z-T Datasheet HTML 12Page - Intersil Corporation ISL12027IB27Z-T Datasheet HTML 13Page - Intersil Corporation Next Button
Zoom Inzoom in Zoom Outzoom out
 9 / 28 page
background image
9
FN8232.4
October 18, 2006
Description
The ISL12027 device is a Real Time Clock with clock/
calendar, two polled alarms with integrated 512x8 EEPROM
configured in 16 Byte per page format, oscillator
compensation, CPU Supervisor (Power on Reset, Low
Voltage Sensing and Watchdog Timer) and battery backup
switch.
The oscillator uses an external, low-cost 32.768kHz crystal.
All compensation and trim components are integrated on the
chip. This eliminates several external discrete components
and a trim capacitor, saving board area and component cost.
The Real-Time Clock keeps track of time with separate
registers for Hours, Minutes, Seconds. The Calendar has
separate registers for Date, Month, Year and Day-of-week.
The calendar is correct through 2099, with automatic leap
year correction.
The Dual Alarms can be set to any Clock/Calendar value for
a match. For instance, every minute, every Tuesday, or 5:23
AM on March 21. The alarms can be polled in the Status
Register. There is a repeat mode for the alarms allowing a
periodic interrupt.
The ISL12027 device integrates CPU Supervisory functions
(POR, WDT) and Battery Switch. There is Power-On-Reset
(RESET) output with 250ms delay from power on. It will also
assert RESET when VDD goes below the specified
threshold. The Vtrip threshold is selectable via VTS2/VTS1/
VTS0 registers to five (5) preselected levels. There is
WatchDog Timer (WDT) with 3 selectable time-out periods
(0.25s, 0.75s and 1.75s) and disabled setting. The
WatchDog Timer activates the RESET pin when it expires.
The device offers a backup power input pin. This VBAT pin
allows the device to be backed up by battery or SuperCap.
The entire ISL12027 device is fully operational from 2.7 to
5.5V and the clock/calendar portion of the ISL12027 device
remains fully operational down to 1.8V (Standby Mode).
The ISL12027 device provides 4k bits of EEPROM with 8
modes of BlockLock™ control. The BlockLock allows a safe,
secure memory for critical user and configuration data, while
allowing a large user storage area.
Pin Descriptions
Serial Clock (SCL)
The SCL input is used to clock all data into and out of the
device. The input buffer on this pin is always active (not
gated). The pull-up resistor on this pin must use the same
voltage source as VDD.
Serial Data (SDA)
SDA is a bidirectional pin used to transfer data into and out
of the device. It has an open drain output and may be wire
ORed with other open drain or open collector outputs. The
input buffer is always active (not gated).
This open drain output requires the use of a pull-up resistor.
The pull-up resistor on this pin must use the same voltage
source as VDD. The output circuitry controls the fall time of
the output signal with the use of a slope controlled pull-
down. The circuit is designed for 400kHz I2C interface
speed.
VBAT
This input provides a backup supply voltage to the device.
VBAT supplies power to the device in the event the VDD
supply fails. This pin can be connected to a battery, a
SuperCap or tied to ground if not used.
RESET
The RESET signal output can be used to notify a host
processor that the watchdog timer has expired or the VDD
voltage supply has dipped below the VRESET threshold. It is
an open drain, active LOW output. Recommended value for
the pull-up resistor is 10k
Ω. If unused it can be tied to
ground.
X1, X2
The X1 and X2 pins are the input and output, respectively, of
an inverting amplifier. An external 32.768kHz quartz crystal
is used with the ISL12027 to supply a timebase for the real
time clock. Internal compensation circuitry provides high
accuracy over the operating temperature range from
-40°C to +85°C. This oscillator compensation network can
be used to calibrate the crystal timing accuracy over
temperature either during manufacturing or with an external
temperature sensor and microcontroller for active
compensation. X2 is intended to drive a crystal only, and
should not drive any external circuit (Figure 11).
NO EXTERNAL COMPENSATION RESISTORS OR
CAPACITORS ARE NEEDED OR ARE RECOMMENDED
TO BE CONNECTED TO THE X1 AND X2 PINS.
Real Time Clock Operation
The Real Time Clock (RTC) uses an external 32.768kHz
quartz crystal to maintain an accurate internal representation
of the second, minute, hour, day, date, month, and year. The
RTC 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 ISL12027 powers up
after the loss of both VDD and VBAT, the clock will not
operate until at least one byte is written to the clock register.
X1
X2
FIGURE 11. RECOMMENDED CRYSTAL CONNECTION
ISL12027


类似零件编号 - ISL12027IB27Z-T

制造商部件名数据表功能描述
logo
Intersil Corporation
ISL12027IB27Z INTERSIL-ISL12027IB27Z Datasheet
390Kb / 28P
   Real Time Clock/Calendar with EEPROM
logo
Renesas Technology Corp
ISL12027IB27Z RENESAS-ISL12027IB27Z Datasheet
1Mb / 29P
   Real Time Clock/Calendar with EEPROM
More results

类似说明 - ISL12027IB27Z-T

制造商部件名数据表功能描述
logo
Intersil Corporation
ISL12027 INTERSIL-ISL12027_10 Datasheet
390Kb / 28P
   Real Time Clock/Calendar with EEPROM
logo
Xicor Inc.
X1240 XICOR-X1240 Datasheet
74Kb / 19P
   Real Time Clock/Calendar with EEPROM
logo
Renesas Technology Corp
ISL12027 RENESAS-ISL12027 Datasheet
1Mb / 29P
   Real Time Clock/Calendar with EEPROM
logo
Intersil Corporation
ISL12026 INTERSIL-ISL12026 Datasheet
381Kb / 24P
   Real Time Clock/Calendar with EEPROM
ISL12029 INTERSIL-ISL12029 Datasheet
426Kb / 28P
   Real Time Clock/Calendar with EEPROM
logo
Xicor Inc.
X1226 XICOR-X1226 Datasheet
420Kb / 24P
   Real Time Clock/Calendar with EEPROM
logo
Intersil Corporation
ISL12028 INTERSIL-ISL12028 Datasheet
423Kb / 28P
   Real Time Clock/Calendar with EEPROM
X1226 INTERSIL-X1226_06 Datasheet
372Kb / 25P
   Real Time Clock/Calendar with EEPROM
X1226 INTERSIL-X1226 Datasheet
388Kb / 25P
   Real Time Clock/Calendar with EEPROM
X1243 INTERSIL-X1243 Datasheet
293Kb / 17P
   Real Time Clock/Calendar/Alarm with EEPROM
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


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