11 FN6667.5 December 13, 2011 General Description The ISL12020M device is a low power real time clock (RTC) with embedded temperature" />
參數(shù)資料
型號(hào)： ISL12020MIRZ-EVALZ
廠(chǎng)商： Intersil
文件頁(yè)數(shù)： 3/34頁(yè)
文件大?。?/td> 0K
描述： EVAL BOARD FOR ISL12020MIRZ
產(chǎn)品培訓(xùn)模塊： Solutions for Industrial Control Applications
標(biāo)準(zhǔn)包裝： 1
主要目的： 計(jì)時(shí)，實(shí)時(shí)時(shí)鐘（RTC）
嵌入式： 否
已用 IC / 零件： ISL12020M
主要屬性： 128 B SRAM，可編程夏令時(shí)
次要屬性： I²C 接口
已供物品： 板
ISL12020M
11
FN6667.5
December 13, 2011
General Description
The ISL12020M 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, both the
ISL12020M could be programmed for automatic Daylight
Savings Time (DST) adjustment by entering local DST
information.
The ISL12020M’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 Super Capacitor
with automatic switchover from VDD to VBAT. The ISL12020M
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 ISL12020M 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.
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 ISL12020M 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
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 ISL12020M 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 Figures 13 and
FIGURE 11. IDD with TSE = 1 vs TEMPERATURE
FIGURE 12. OSCILLATOR CHANGE vs TEMPERATURE AT
DIFFERENT AGING SETTINGS (IATR) (BETA SET FOR
1ppm STEPS)
Typical Performance Curves Temperature is +25°C unless otherwise specified. (Continued)
40
50
60
70
80
90
100
110
-40
-20
0
2040
6080
TEMPERATURE (°C)
I DD
(A)
VBAT = 2.7V
VDD = 3.3V
VDD = 5.5V
-80
-60
-40
-20
0
20
40
60
80
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
FREQUEN
C
Y
CHANGE
(ppm)
62.5ppm
32ppm
0ppm
-31ppm
-61.5ppm
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