参数资料
| 型号： | ISL12024IRTCZ-T |
| 厂商： | Intersil |
| 文件页数： | 6/24页 |
| 文件大小： | 0K |
| 描述： | IC RTC/CALENDER 64BIT 8-TDFN |
| 标准包装： | 6,000 |
| 类型： | 时钟/日历 |
| 特点： | 警报器，闰年，唯一 ID |
| 时间格式： | HH:MM:SS（12/24 小时） |
| 数据格式： | YY-MM-DD-dd |
| 接口： | I²C，2 线串口 |
| 电源电压： | 2.7 V ~ 5.5 V |
| 电压 - 电源，电池： | 1.8 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TDFN |
| 供应商设备封装： | 8-TDFN（3x3） |
| 包装： | 带卷 (TR) |
14
FN6749.1
December 15, 2011
VDD must drop below the battery trip point yet stay above
approximately 1.0V (limit of active circuit operation). After
that, the power-up ramp must be slower than 0.25V/ms to
trigger the delay. To be safe, serial interface software may
need to consider the 90ms delay in all power-up routines.
OPTION 1 - STANDARD (POWER CONTROL) MODE
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”. A description of power switchover follows:
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 ISL12024IRTCZ 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)
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.
To select Option 2, the 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:
VDD > VBAT +VBATHYS
The Legacy Mode power control conditions are illustrated in
Figure 11..
Serial Communication
The device supports the I2C protocol.
Clock and Data
Data states on the SDA line can change only during SCL
LOW. SDA state changes during SCL HIGH are reserved for
indicating start and stop conditions (see Figure 12).
BATTERY BACKUP
MODE
VDD
2.2V
FIGURE 9. BATTERY SWITCHOVER WHEN VBAT < VTRIP
VBAT
VTRIP
1.8V
VBAT + VBATHYS
VBAT - VBATHYS
FIGURE 10. BATTERY SWITCHOVER WHEN VBAT > VTRIP
VTRIP
VBAT
VTRIP + VTRIPHYS
BATTERY BACKUP
MODE
VDD
VTRIP
3.0V
2.2V
VBAT
In
VOLTAGE
VDD
ON
OFF
FIGURE 11. BATTERY SWITCHOVER IN LEGACY MODE
ISL12024IRTC
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