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| 型号： | ISL1219 |
| 厂商： | Intersil Corporation |
| 英文描述： | Low Power RTC with Battery Backed SRAM and Event Detection(具有电池供电的SRAM和事件检测功能的低功率RTC) |
| 中文描述： | 低功耗RTC与电池供电的SRAM和事件检测（具有电池供电的SRAM的和事件检测功能的低功率实时时钟） |
| 文件页数： | 8/25页 |
| 文件大小： | 373K |
| 代理商： | ISL1219 |
8
FN6314.1
August 14, 2006
V
BAT
This input provides a backup supply voltage to the device.
V
BAT
supplies power to the device in the event that the V
DD
supply fails. This pin can be connected to a battery, a Super
Cap or tied to ground if not used.
EVIN (Event Input)
The EVIN pin is an input that is used to detect an externally
monitored event. When a high signal is present at the EVIN
pin, an “event” is detected. This input may be used for
various monitoring functions, such as the opening of a
detection switch on a chassis or door. The event detection
circuit can be user enabled or disabled (see EVEN bit) and
provides the option to be operational in battery backup
modes (see EVBATB bit). When the event detection is
disabled the EVIN pin is gated OFF. See functional
Description for more details.
EVDET (Event Detect Output)
The EVDET is an open drain output which will go low when
an event is detected at the EVIN pin. If the event detection
function is enabled, the EVDET output will go low and stay
low until the EVT bit is cleared (see EVIN pin description).
IRQ/F
OUT
(Interrupt Output/Frequency Output)
This dual function pin can be used as an interrupt or
frequency output pin. The IRQ/F
OUT
mode is selected via
the frequency out control bits of the control/status register.
Interrupt Mode.
The pin provides an interrupt signal
output. This signal notifies a host processor that an alarm
has occurred and requests action. It is an open drain
active low output.
Frequency Output Mode.
The pin outputs a clock signal
which is related to the crystal frequency. The frequency
output is user selectable and enabled via the I
2
C bus. It is
an open drain active low output.
Serial Clock (SCL)
The SCL input is used to clock all serial data into and out of
the device. The input buffer on this pin is always active (not
gated). It is disabled when the backup power supply on the
V
BAT
pin is activated to minimize power consumption.
Serial Data (SDA)
SDA is a bidirectional 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 I
2
C interface speeds. It is disabled
when the backup power supply on the V
BAT
pin is activated.
V
DD
, GND
Chip power supply and ground pins. The device will operate
with a power supply from V
DD
= 2.7V to 5.5VDC. A 0.1μF
capacitor is recommended on the V
DD
pin to ground.
Functional Description
Power Control Operation
The power control circuit accepts a V
DD
and a V
BAT
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 ISL1219 for up to 10 years. Another option is to use a
Super Cap for applications where V
DD
is interrupted for up
to a month. See the Applications Section for more
information.
Normal Mode (V
DD
) to Battery Backup Mode
(V
BAT
)
To transition from the V
DD
to V
BAT
mode, both of the
following conditions must be met:
Condition 1:
V
DD
< V
BAT
- V
BATHYS
where V
BATHYS
≈
50mV
Condition 2:
V
DD
< V
TRIP
where V
TRIP
≈
2.2V
Battery Backup Mode (V
BAT
) to Normal Mode
(V
DD
)
The ISL1219 device will switch from the V
BAT
to V
DD
mode
when one of the following conditions occurs:
Condition 1:
V
DD
> V
BAT
+ V
BATHYS
where V
BATHYS
≈
50mV
Condition 2:
V
DD
> V
TRIP
+ V
TRIPHYS
where V
TRIPHYS
≈
30mV
FIGURE 10. RECOMMENDED CRYSTAL CONNECTION
X1
X2
ISL1219
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相关代理商/技术参数 |
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|---|---|
| ISL1219IUZ | 功能描述:实时时钟 REAL TIME CLKRTC IN RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| ISL1219IUZ-T | 功能描述:实时时钟 REAL TIME CLKRTC IN RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| ISL1220 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:I2C㈢ Real Time Clock/Calendar with Frequency Output |
| ISL1220IUZ | 功能描述:实时时钟 REAL TIME CLKRTC IN RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| ISL1220IUZ-T | 功能描述:实时时钟 REAL TIME CLKRTC IN RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
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