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PDF ( 数据手册 , 数据表 ) ISL12020

零件编号 ISL12020
描述 Low Power RTC
制造商 Intersil Corporation
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ISL12020 数据手册, 描述, 功能
ISL12020
®
Real Time Clock with On Chip Temp Compensation ±5ppm
Data Sheet
March 29, 2007
FN6450.0
Low Power RTC with VDD Battery Backed
SRAM and Embedded Temp
Compensation ±5ppm with Auto Day Light
Saving
The ISL12020 device is a low power real time clock with an
embedded Temp sensor for oscillator compensation,
clock/calendar, power fail, low battery monitor, brown out
indicator, single periodic or polled alarms, intelligent battery
backup switching and 128 bytes of battery-backed user
SRAM.
The oscillator uses an external, low-cost 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.
Daylight Savings time adjustment is done automatically,
using parameters entered by the user. Power fail and battery
monitors offer user-selectable trip levels. A time stamp
function records the time and date of switchover from VDD to
battery power, and also from battery to VDD power.
Pinoutwww.DataSheet4U.com
ISL12020
(8 LD SOIC)
TOP VIEW
X1
X2
VBAT
GND
1
2
3
4
8 VDD
7 IRQ/FOUT
6 SCL
5 SDA
Features
• Real Time Clock/Calendar
- Tracks Time in Hours, Minutes and Seconds
- Day of the Week, Day, Month and Year
• On-chip Oscillator Compensation Over the Operating
Temp Range
- ±5ppm over -20°C to +70°C
• Day Light Saving Time
- Customer Programmable
• 15 Selectable Frequency Outputs
• 1 Alarm
- Settable to the Second, Minute, Hour, Day of the Week,
Day, or Month
- Single Event or Pulse Interrupt Mode
• Automatic Backup to Battery or Super Cap
- Operation to VBAT = 1.8V
- 1.0µA Battery Supply Current
• Battery Status Monitor, 2 Levels, Selectable by Customer
to:
- Seven Selectable Voltages for Each Level
• Power Status Brown Out Monitor
• Six Selectable Trip Level, from 4.675V to 2.295V Power
Failure Detection
• Time Stamp during Power to Battery and Battery to Power
Cross Over
- Time Stamp. First VDD to VBAT, and Last VBAT to VDD
• 128 Bytes Battery-Backed User SRAM
• I2C Interface
- 400kHz Clock Frequency
• 8 Ld SOIC Package ISL12020
• Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
• Utility Meters
• POS Equipment
• Medical Application
• Security Related Application
• Vending Machine
• White Goods
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2007. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.







ISL12020 pdf, 数据表
ISL12020
Serial Data (SDA)
SDA is a bi-directional pin used to transfer data into and out
of the device. It has an open drain output and may be ORed
with other open drain or open collector outputs. The input
buffer is always active (not gated) in normal mode.
An open drain output requires the use of a pull-up resistor.
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 speeds. It is disabled
when the backup power supply on the VBAT pin is activated.
VDD, GND
Chip power supply and ground pins. The device will operate
with a power supply from VDD = 2.7V to 5.5VDC. A 0.1µF
capacitor is recommended on the VDD pin to ground.
Functional Description
Power Control Operation
The power control circuit accepts a VDD and a VBAT input.
Many types of batteries can be used with Intersil RTC
products. For example, 3.0V or 3.6V Lithium batteries are
appropriate, and battery sizes are available that can power
the ISL1202x for up to 10 years. Another option is to use a
Super Capacitor for applications where VDD is interrupted
for up to a month. See the “Application Section” on page 22
for more information.
Normal Mode (VDD) to Battery Backup Mode
(VBAT)
To transition from the VDD to VBAT mode, both of the
following conditions must be met:
Condition 1:
VDD < VBAT - VBATHYS
where VBATHYS 50mV
Condition 2:
VDD < VTRIP
where VTRIP 2.2V
Battery Backup Mode (VBAT) to Normal Mode
(VDD)
The ISL12020 device will switch from the VBAT to VDD mode
when one of the following conditions occurs:
Condition 1:
VDD > VBAT + VBATHYS
where VBATHYS 50mV
Condition 2:
VDD > VTRIP + VTRIPHYS
where VTRIPHYS 30mV
These power control situations are illustrated in Figure 3 and
Figure 4.
VDD
VTRIP
VBAT
VBAT - VBATHYS
BATTERY BACKUP
MODE
2.2V
1.8V
VBAT + VBATHYS
FIGURE 3. BATTERY SWITCHOVER WHEN VBAT < VTRIP
VDD
VBAT
VTRIP
VTRIP
BATTERY BACKUP
MODE
3.0V
2.2V
VTRIP + VTRIPHYS
FIGURE 4. BATTERY SWITCHOVER WHEN VBAT > VTRIP
The I2C bus is deactivated in battery backup mode to reduce
power consumption. Aside from this, all RTC functions are
operational during battery backup mode. Except for SCL and
SDA, all the inputs and outputs of the ISL12020 are active
during battery backup mode unless disabled via the control
register.
The device Time Stamps the switchover from VDD to VBAT
and VBAT to VDD, and the time is stored in TSV2B and
TSB2V registers respectively. If multiple VDD power down
sequences occur before status is read, the earliest VDD to
VBAT power down time is stored and the most recent VBAT
to VDD time is stored.
Temperature conversion and compensation can be enabled
in battery backup mode. Bit BTSE in the BETA register
controls this operation as described in that register section.
Power Failure Detection
Both the ISL12020 provide a Real Time Clock Failure Bit
(RTCF) to detect total power failure. It allows users to
determine if the device has powered up after having lost all
power to the device (both VDD and VBAT).
Brownout Detection
The ISL12020 monitor the VDD level continuously and
provide warning if the VDD level drops below prescribed
levels. There are six (6) levels that can be selected for the
trip level. These values are 85% below popular VDD levels.
The LVDD bit in the Status Register will be set to “1” when
Brownout is detected. Note. The I2C serial bus remains
active unless the Battery Vtrip levels are reached.
8 FN6450.0
March 29, 2007







ISL12020 equivalent, schematic
ISL12020
TABLE 12. IATRO TRIMMING RANGE (Continued)
TRIMMING
IATR05 IATR04 IATR03 IATR02 IATR01 IATR00 RANGE
0 0 1 1 0 0 +20
0 0 1 1 0 1 +19
0 0 1 1 1 0 +18
0 0 1 1 1 1 +17
0 1 0 0 0 0 +16
0 1 0 0 0 1 +15
0 1 0 0 1 0 +14
0 1 0 0 1 1 +13
0 1 0 1 0 0 +12
010101
+11
0 1 0 1 1 0 +10
010111
+9
011000
+8
011001
+7
011010
+6
011011
+5
011100
+4
011101
+3
011110
+2
011111
+1
100000
0
100001
-1
100010
-2
100011
-3
100100
-4
100101
-5
100110
-6
100111
-7
101000
-8
101001
-9
101010
-10
101011
-11
101100
-12
101101
-13
101110
-14
101111
-15
110000
-16
110001
-17
110010
-18
110011
-19
110100
-20
110101
-21
110110
-22
110111
-23
111000
-24
111001
-25
111010
-26
111011
-27
111100
-28
111101
-29
111110
-30
111111
-31
ALPHA Register (ALPHA)
TABLE 13. ALPHA REGISTER
ADDR 7
6
5
4
3
2
1
0
0Ch 0 ALPHA6 ALPHA5 ALPHA4 ALPHA3 ALPHA2 ALPHA1 ALPHA0
The Alpha variable is 7 bits and is defined as the
temperature coefficient of Crystal, normally given in units of
ppm/°C2 = and with a typical value of -0.034. The ISL12020
devices use a scaled version of the absolute value of this
coefficient in order to get an integer value. Therefore, Alpha
<6:0> is defined as the (|Actual Alpha Value| x 1024) and
converted to binary. For example, a crystal with Alpha of -
0.034ppm/°C2 is first scaled:
|1024*(-0.034)| = 35d and then converted to a binary number
of 0100011b.
The practical range of Actual Alpha values is from
-0.020 to -0.060.
The ALPHA register should only be changed while the TSE
(Temp Sense Enable) bit is “0”.
BETA Register (BETA)
TABLE 14.
ADDR 7
6
54 3
2
1
0
0Dh TSE BTSE BTSR 0 BETA3 BETA2 BETA1 BETA0
TEMPERATURE SENSOR ENABLED BIT (TSE)
This bit enables the Temperature Sensing operation, including
the temperature sensor, A/D converter and ATR/DTR register
adjustment. The default mode after power up is disabled
(TSE = 0). To enable the operation, TSE should be set to 1
(TSE = 1). When temp sense is disabled, the initial values for
IATR and IDTR registers are used for frequency control.
All changes to the IDTR, IATR, ALPHA and BETA registers
must be made with TSE = 0. After loading the new values,
then TSE can be enabled and the new values are used.
TEMP SENSOR CONVERSION IN BATTERY MODE BIT
(BTSE)
This bit enables the Temperature Sensing and Correction in
battery mode. BTSE = 0 defualt no conversion in battery
mode. BTSE = 1 Temp Sensing enabled in battery
mode.The BTSE is disabled when battery voltage is lower
than 2.6V.
FREQUENCY OF TEMPERATURE SENSING AND
CORRECTION BIT (BTSR)
This bit controls the frequency of Temp Sensing and
Correction. BTSR = 0 default mode is every 10 minutes,
BTSR = 1 is every 1.0 minute. Note that BTSE has to be
enabled in both cases. See Table 15.
16 FN6450.0
March 29, 2007










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