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参数资料
| 型号： | ISL1221 |
| 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： | 2/25页 |
| 文件大小： | 377K |
| 代理商： | ISL1221 |
2
FN6316.0
June 22, 2006
Block Diagram
I
2
C
INTERFACE
CONTROL
LOGIC
ALARM
FREQUENCY
OUT
RTC
DIVIDER
SDA
BUFFER
CRYSTAL
OSCILLATOR
POR
SWITCH
SCL
BUFFER
SDA
SCL
X1
X2
V
DD
V
BAT
IRQ/
EVDET
INTERNAL
SUPPLY
V
TRIP
Seconds
Minutes
Hours
Day of Week
Date
Month
Year
USER
SRAM
CONTROL
REGISTERS
EVIN
GND
F
OUT
Pin Descriptions
PIN
NUMBER
SYMBOL
DESCRIPTION
1
X1
X1.
The X1 pin is the input of an inverting amplifier and is intended to be connected to one pin of an external
32.768kHz quartz crystal. X1 can also be driven directly from a 32.768kHz source.
2
X2
X2.
The X2 pin is the output of an inverting amplifier and is intended to be connected to one pin of an external
32.768kHz quartz crystal. X2 should be left open when X1 is driven from external source.
3
V
BAT
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 should be tied to ground if not used.
4
GND
Ground
.
5
EVIN
Event Input
(
EVIN
). The EVIN is an input pin that is used to detect an externally monitored event. When a high signal
is present at the EVIN pin an “event” is detected.
6
F
OUT
Frequency Output F
OUT
, Frequency output pin, 15 selectable frequencies. Open drain output.
7
SDA
Serial Data
(
SDA
). SDA is a bidirectional pin used to transfer serial data into and out of the device. It has an open
drain output and may be wire OR’ed with other open drain or open collector outputs.
8
SCL
Serial Clock
(
SCL
). The SCL input is used to clock all serial data into and out of the device.Open drain output.
9
IRQ/EVDET
Interrupt (IRQ)/Event Detect (EVDET) Output
.
Multi-functional pin that can be used as interrupt for Alarm and Event
Detect. Open Drain Output.
10
V
DD
V
DD.
Power supply.
ISL1221
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