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參數(shù)資料
| 型號： | ISL12028AIV27Z-T |
| 廠商： | Intersil |
| 文件頁數(shù)： | 8/29頁 |
| 文件大小： | 0K |
| 描述： | IC RTC/CALENDAR EEPROM 14TSSOP |
| 產(chǎn)品培訓模塊： | Solutions for Industrial Control Applications |
| 標準包裝： | 2,500 |
| 類型： | 時鐘/日歷 |
| 特點： | 警報器，閏年，監(jiān)控器，監(jiān)視計時器 |
| 時間格式： | HH:MM:SS（12/24 小時） |
| 數(shù)據(jù)格式： | YY-MM-DD-dd |
| 接口： | I²C，2 線串口 |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 電壓 - 電源，電池： | 1.8 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-TSSOP（0.173"，4.40mm 寬） |
| 供應商設(shè)備封裝： | 14-TSSOP |
| 包裝： | 帶卷 (TR) |
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16
FN8233.9
November 30, 2010
for up to a month. See “Application Section” on page 22 for
more information.
There are two options for setting the change-over conditions
from VDD to Battery back-up mode. The BSW bit in the PWR
register controls this operation.
Option 1 - Standard Mode (Default for ISL12028A)
Option 2 - Legacy Mode (Default for ISL12028)
Note that applications that have VBAT > VDD will require the
ISL12028A (standard mode) for proper start-up. Note that
the I2C may or may not be operational during battery
backup, that function is controlled by the SBIB bit. That
operation is covered after the power control section.
OPTION 1 - STANDARD POWER CONTROL MODE
(DEFAULT FOR ISL12028A)
In the Standard mode, the supply will switch over to the
battery when VDD drops below VTRIP or VBAT, whichever is
lower. In this mode, accidental operation from the battery is
prevented since the battery backup input will only be used
when the VDD supply is shut off.
To select Option 1, BSW bit in the Power Register must be
set to “BSW = 0”. Following is a description of power
switchover.
Standard Mode Power Switchover
Normal Operating 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 ISL12028 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
There are two discrete situations that are possible when
using Standard Mode: VBAT < VTRIP and VBAT > VTRIP.
These two power control situations are illustrated in
OPTION 2 - LEGACY POWER CONTROL MODE
(DEFAULT FOR ISL12028)
The Legacy Mode follows conditions set in X1226 products.
In this mode, switching from VDD to VBAT is simply done by
comparing the voltages and the device operates from
whichever is the higher voltage. Care should be taken when
changing from Normal to Legacy Mode. If the VBAT voltage is
higher than VDD, then the device will enter battery backup and
unless the battery is disconnected or the voltage decreases,
the device will no longer operate from VDD. If that is the
situation on initial power-up, then I2C communication may not
be possible. For these applications, the ISL12028A should be
used.
To select Option 2, BSW bit in the Power Register must be
set to “BSW = 1”
Normal Mode (VDD) to Battery Backup Mode (VBAT)
To transition from the VDD to VBAT mode, the following
conditions must be met:
VDD < VBAT - VBATHYS
Battery Backup Mode (VBAT) to Normal Mode (VDD)
The device will switch from the VBAT to VDD mode when the
following condition occurs:
TABLE 7. VBAT TRIP POINT WITH DIFFERENT BSW SETTING
BSW BIT
VBAT TRIP POINT
(V)
POWER CONTROL SETTING
0
2.2
Standard Mode (ISL12028A)
1VDD < VBAT
Legacy Mode (ISL12028)
BATTERY
MODE
VDD
2.2V
FIGURE 13. BATTERY SWITCHOVER WHEN VBAT < VTRIP
VBAT
VTRIP
1.8V
VBAT + VBATHYS
VBAT - VBATHYS
BACKUP
FIGURE 14. BATTERY SWITCHOVER WHEN VBAT > VTRIP
VTRIP
VBAT
VTRIP + VTRIPHYS
BATTERY BACKUP
MODE
VDD
VTRIP
3.0V
2.2V
ISL12028, ISL12028A
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