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PDF ISL12022MR5421 Data sheet ( Hoja de datos )
| Número de pieza | ISL12022MR5421 | |
| Descripción | Low Power RTC | |
| Fabricantes | Intersil | |
| Logotipo |  |
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Low Power RTC with Battery Backed SRAM, Integrated
±5ppm Temperature Compensation and Auto Daylight
Saving
ISL12022MR5421
The ISL12022MR5421 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 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.
The ISL12022MR5421 has redesign package to increase
Contact and Air Discharge ESD performance.
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
• I2C-Bus™
• RoHS Compliant
Applications
• Utility Meters
• POS Equipment
• Printers and Copiers
• Digital Cameras
1 GND GND 20
2 GND GND 19
3 GND
4 NC
GND 18
NC 17
3.3V
SCHOTTKY DIODE
BAT54
BATTERY
3.0V
C2
0.1µF
5
6
7
8
9
NC
GND
VBAT
GND
NC
NC
GND
VDD
IRQ/FOUT
SCL
16
15
14
13
12
C1
0.1µF
R1 R2 R3
10k 10k 10k
10 NC
SDA 11
ISL12022MR5421
VDO
SCL MCU
SDAINTERFACE
GND
IRQ/FOUT
FIGURE 1. TYPICAL APPLICATION CIRCUIT
5 OSCILLATOR ERROR vs TEMPERATURE
4
3
2
1
0 VBAT = 5.5V
-1 VDD = 2.7V
-2
-3 VDD = 3.3V
-4
-5
-40 -20
0 20 40
TEMPERATURE (°C)
60
80
FIGURE 2. PERFORMANCE CURVE
June 7, 2012
FN7576.3
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2010-2012. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL12022MR5421
I2C Serial Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Protocol Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Device Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Write Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Read Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Application Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Power Supply Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Battery Backup Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Layout Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Measuring Oscillator Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Temperature Compensation Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Daylight Savings Time (DST) Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Package Outline Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5 FN7576.3
June 7, 2012
5 Page 
ISL12022MR5421
Typical Performance Curves Temperature is +25°C unless otherwise specified. (Continued)
5.5
5.0
FOUT = 32kHz
4.5
4.0
3.5 FOUT = 64Hz
3.0 FOUT = 1Hz
2.5
-40
-20
0
20 40 60 80
TEMPERATURE (°C)
FIGURE 10. IDD vs TEMPERATURE, 3 DIFFERENT FOUT
110
100
90 VBAT = 5.5V
80
70
60
50 VDD = 3.0V
40
30 VDD = 1.8V
20
-40
-20
0 20 40
TEMPERATURE (°C)
60
80
FIGURE 11. IBAT WITH TSE = 1, BTSE = 1 vs TEMPERATURE
110
100 VBAT = 5.5V
90
80 VDD = 3.3V
70
60
VDD = 2.7V
50
40
-40
-20
0
20 40 60
TEMPERATURE (°C)
FIGURE 12. IDD WITH TSE = 1 vs TEMPERATURE
80
80
60
32ppm
40 62.5ppm
20 0ppm
0
-20
-40
-61.5ppm
-31ppm
-60
-80
-40
-20
0 20 40
TEMPERATURE (°C)
60
80
FIGURE 13. OSCILLATOR CHANGE vs TEMPERATURE AT
DIFFERENT AGING SETTINGS (IATR) (BETA SET FOR
1ppm STEPS)
General Description
The ISL12022MR5421 device is a low power real time clock (RTC)
with embedded temperature sensor and crystal. It contains crystal
frequency compensation circuitry over the operating temperature
range good to ±5ppm accuracy. It also contains a clock/calendar
with Daylight Savings Time (DST) adjustment, power fail and low
battery monitors, brownout indicator, 1 periodic or polled alarm,
intelligent battery backup switching and 128 Bytes of battery-
backed user SRAM.
The oscillator uses an internal 32.768kHz crystal. The real time
clock tracks time with separate registers for hours, minutes and
seconds. The device has calendar registers for date, month, year
and day of the week. The calendar is accurate through 2099,
with automatic leap year correction. In addition, the
ISL12022MR5421 can be programmed for automatic Daylight
Saving Time (DST) adjustment by entering local DST information.
The ISL12022MR5421’s alarm can be set to any clock/calendar
value for a match. For example, every minute, every Tuesday or at
5:23 AM on March 21. The alarm status is available by checking the
Status Register, or the device can be configured to provide a
hardware interrupt via the IRQ/FOUT pin. There is a repeat mode for
the alarm allowing a periodic interrupt every minute, every hour,
every day, etc.
The device also offers a backup power input pin. This VBAT pin
allows the device to be backed up by battery or supercapacitor
with automatic switchover from VDD to VBAT. The
ISL12022MR5421 device is specified for VDD = 2.7V to 5.5V and
the clock/calendar portion of the device remains fully
operational in battery backup mode down to 1.8V (Standby
Mode). The VBAT level is monitored and reported against
preselected levels. The first report is registered when the VBAT
level falls below 85% of nominal level; the second level is set for
75%. Battery levels are stored in PWR_VBAT registers.
The ISL12022MR5421 offers a “Brownout” alarm once the VDD
falls below a pre-selected trip level. This allows system Micro to
save vital information to memory before complete power loss.
There are six VDD levels that could be selected for initiation of the
Brownout alarm.
11 FN7576.3
June 7, 2012
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ISL12022MR5421.PDF ] | |
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