ISL28127_12 Datasheet, PDF (8/44 Pages) Intersil Corporation – Providing high-performance solutions for every link in the signal chain

Real Time Clocks
Intersil’s family of Real Time Clock products offer a wide variety of
useful industry-standard functions and features including clocks and
calendars, programmable alarms with event recording, non-volatile
memory for system personality data and unique device IDs, and
power supervision including backup battery and system shutdown
management. The 3-in-1 Module products feature an integrated 32kHz
crystal with onboard temperature sensor, to maintain high accuracy
over the rated temperature range without user calibration.
Target Applications
• Handheld / Portable Devices
• Industrial / Communications /
Specialty
• High Volume Consumer
• Residential / Industrial Power Meter
► High-Accuracy RTC Modules
RTC Modules with Embedded Crystal and Temp Comp: ISL12022M
3 in 1 RTC Module
(RTC + Embedded
Crystal + Temp Sensor)
Achieves Better than
+5ppm Accuracy
Key Features
• ±5ppm Accuracy (-40°C to +85°C)
-- Factory programmed RTC for optimal accuracy
-- Onboard temperature sensor
-- Embedded crystal
• Reliable Timekeeping & Power Management
-- Backup battery management
-- Vdd and battery status monitors and switchover
timestamp
-- Battery Reseal^TM function extends battery shelf
life
• User Programmability
-- I²C Interface
-- 128 bytes battery-backed user SRAM
• See also
-- ISL12020M (DFN 3 in 1); ISL12022 and ISL12023
standalone RTCs
Block Diagram
Embedded Crystal
ISL12022M
Embedded
Temperature Sensor
2.7V to 5.5V
V_DD
1.8V to 5.5V
V_BAT
Battery or
Super Cap
Crystal
Oscillator
Frequency
Control
Power Control
POR
V_TRIP
±
Switch
Temp
Sensor
Compen-
sation
Registers
Single
Alarm
Brown-out
Alarm
Battery
ReSeal™
Clock
Calendar
Battery-
backed
User SRAM
I²C
µP
IRQ/F_OUT
High Accuracy Even in Extreme Temperature Conditions
ISL12022M Compensated
Crystal Drift
0.0
-20.0
-40.0
-60.0
-80.0
-100.0
-120.0
-140.0
Uncompensated Crystal Drift
-160.0
-40 -20
0 20 40 60
Temperature (°C)
80 100
Better than ±5.0ppm
over -40 to +85°C!
5
4
3
2
1
0
-1
-2
-3
-4
-5
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
CPU Supervisory
Function
Battery
Device
ISL12020M
Selectable
Watch-
I_BAT
Frequency
(nA) Alarms Output POR
dog
Timer
Seal Backup IRQ F_OUT
SRAM
Other Functions
1000
1
15
N
N
Y
Y
Shared Pin
128 Bytes
• Battery Switchover Time Stamp
• Battery Status Monitor
ISL12022M
1000
1
15
N
N
Y
Y
Shared Pin
128 Bytes
• Battery Switchover Time Stamp
• Battery Status Monitor
ISL12022MA
1000
1
• Enhanced Environmental MoistureTolerance
15
N
N
Y
Y
Shared Pin
128 Bytes
• 100% Pin Compatible with ISL12022M
• Firmware Compatible with ISL12020M and
ISL12022M
ISL12022M-R5421 1000
1
• Enhanced ESD Performance
15
N
N
Y
Y
Shared Pin
128 Bytes
• 100% Pin Compatible with ISL12022M
• Firmware Compatible with ISL12020M and
ISL12022M
Package
20 Ld DFN
20 Ld SOIC
Enhanced
20 Ld SOIC
Enhanced
20 Ld SOIC
8
Intersil Signal Path Products  2012  www.intersil.com