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ISL12022MIBZ датащи(PDF) 1 Page - Renesas Technology Corp

номер детали ISL12022MIBZ
подробное описание детали  Low Power RTC with Battery Backed SRAM, Integrated 짹5ppm Temperature Compensation and Auto Daylight Saving
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производитель  RENESAS [Renesas Technology Corp]
домашняя страница  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

ISL12022MIBZ датащи(HTML) 1 Page - Renesas Technology Corp

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FN6668 Rev 9.00
Page 1 of 32
June 20, 2012
FN6668
Rev 9.00
June 20, 2012
ISL12022M
Low Power RTC with Battery Backed SRAM, Integrated ±5ppm Temperature
Compensation and Auto Daylight Saving
DATASHEET
The ISL12022M device is a low power real time clock (RTC)
with an embedded temperature sensor and crystal. Device
functions include oscillator compensation, clock/calendar,
power fail and low battery monitors, brownout indicator,
one-time, periodic or polled alarms, intelligent battery backup
switching, Battery Reseal™ function and 128 bytes of battery-
backed user SRAM. Backup battery current draw is less than
1.6µA over the temperature range. The device is offered in a
20 Ld SOIC module that contains the RTC and an embedded
32.768kHz quartz crystal. The calibrated oscillator provides
less than ±5ppm drift over the full -40°C to +85°C
temperature range.
The RTC tracks time with separate registers for hours, minutes,
and seconds. The calendar registers track date, month, year
and day of the week and are accurate through 2099, with
automatic leap year correction.
Daylight Savings time adjustment is done automatically, using
parameters entered by the user. Power fail and battery
monitors offer user-selectable trip levels. The time stamp
function records the time and date of switchover from VDD to
VBAT power, and also from VBAT to VDD power.
Related Literature
•See AN1549 “Addressing Power Issues in Real Time Clock
Applications”
Features
• Embedded 32.768kHz Quartz Crystal in the Package
• 20 Ld SOIC Package (for DFN version, refer to the
ISL12020M)
•Calendar
• On-chip Oscillator Temperature Compensation
• 10-bit Digital Temperature Sensor Output
• 15 Selectable Frequency Outputs
• Interrupt for Alarm or 15 Selectable Frequency Outputs
• Automatic Backup to Battery or Supercapacitor
•VDD and Battery Status Monitors
• Battery Reseal™ Function to Extend Battery Shelf Life
• Power Status Brownout Monitor
• Time Stamp for Battery Switchover
• 128 Bytes Battery-Backed User SRAM
• 1.6µA Max Battery Current
•I2C-Bus™
• RoHS Compliant
Applications
• Utility Meters
•POS Equipment
• Printers and Copiers
• Digital Cameras
FIGURE 1. TYPICAL APPLICATION CIRCUIT
FIGURE 2. OSCILLATOR ERROR vs TEMPERATURE
NC
1
NC
2
NC
3
NC
4
NC
5
GND
6
VBAT
7
GND
8
NC
9
NC
10
SDA
11
SCL
12
IRQ/ 13
VDD 14
ISL12022M
GND 15
NC 16
NC 17
NC 18
NC 19
NC 20
3.3V
R1
10k
R2
10k
R3
10k
C1
0.1µF
BAT54
SDA
SCL MCU
GND
INTERFACE
VDD
BATTERY
3.0V
C2
0.1µF
SCHOTTKY DIODE
IRQ/FOUT
FOUT
-5
-4
-3
-2
-1
0
1
2
3
4
5
-40
-20
0
20406080
TEMPERATURE (°C)
VDD = 2.7V
VBAT = 5.5V
VDD = 3.3V


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