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Giải thích chi tiết về linh kiện  Low Power RTC with Battery Backed SRAM, Integrated 짹5ppm Temperature Compensation and Auto Daylight Saving
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FN6667 Rev 6.00
Page 1 of 34
January 9, 2015
FN6667
Rev 6.00
January 9, 2015
ISL12020M
Low Power RTC with Battery Backed SRAM, Integrated ±5ppm Temperature
Compensation and Auto Daylight Saving
DATASHEET
The ISL12020M 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. The device is offered in a
20 Ld DFN module that contains the RTC and an embedded
32.768kHz quartz crystal. The calibrated oscillator provides
less than ±5ppm drift across the 0°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
• AN1549, “Addressing Power Issues in Real Time Clock
Applications”
• AN1389, “Using Intersil’s High Accuracy Real Time Clock
Module”
Features
• Embedded 32.768kHz quartz crystal in the package
• 20 Ld DFN package (for SOIC version, refer to the
ISL12022M)
•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
•I2C-Bus™
• RoHS compliant
Applications
• Utility meters
• POS equipment
• Printers and copiers
• Digital cameras
ISL12020M
3.3V
C1
0.1µF
BAT54
SDA
SCL
GND
VDD
BATTERY
3.0V
C2
0.1µF
SCHOTTKY DIODE
1
2
3
4
5
6
7
8
9
10
X2
X2
X2
X2
X2
NC
VBAT
GND
NC
NC
11
12
13
14
15
16
17
18
19
20
SDA
SCL
VDD
NC
X1
X1
X1
X1
X1
10k
R2
10k
R3
10k
IRQ/FOUT
IRQ/FOUT
MCU
INTERFACE
R1
FIGURE 1. TYPICAL APPLICATION CIRCUIT


Số phần tương tự - ISL12020MIRZ

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