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參數(shù)資料
| 型號： | DS1678S/T&R |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 22/25頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC RECORDER REALTIME EVENT 8SOIC |
| 標準包裝： | 2,000 |
| 類型： | 時間事件記錄器 |
| 特點： | 警報器，閏年，NVSRAM，Y2K |
| 存儲容量： | 32B |
| 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： | 4.5 V ~ 5.5 V |
| 電壓 - 電源，電池： | 2.6 V ~ 3.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.209"，5.30mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SO |
| 包裝： | 帶卷 (TR) |
DS1678 Real-Time Event Recorder
6 of 25
PIN DESCRIPTION
PIN NAME
FUNCTION
1, 2
X1, X2
Connections for Standard 32.768kHz Quartz Crystal. For greatest accuracy,
the DS1678 must be used with a crystal that has a specified load capacitance
of 12.5pF. There is no need for external capacitors or resistors. Note: X1 and
X2 are very high-impedance nodes. It is recommended that they and the
crystal be isolated from high-frequency signals. For more information on
crystal selection and crystal layout considerations, refer to Application Note
58: Crystal Considerations with Dallas Real-Time Clocks.
3
VBAT
Battery Input for Standard Lithium Cell or Other Energy Source. All
functions of the DS1678 with the exception of the serial interface circuitry
are powered by VBAT when VCC < VBAT. All functions are powered by VCC
when VCC > VBAT. The serial interface is enabled when VCC is above VPF. If
a battery or other energy source is not used, VBAT should be connected
directly to ground. Diodes must not be placed between the battery and the
VBAT input or improper operation results. UL recognized to ensure against
reverse charging current when used with a lithium battery. See “Conditions
of Acceptability” at www.maxim-ic.com/qa/info/ul/.
4
GND
Ground
5
SDA
Serial Data Input/Output. SDA is the data input/output (I/O) signal for the
I2C serial interface. The SDA pin is an open-drain I/O and requires an
external pullup resistor.
6
SCL
Serial Clock Input. SCL is used to synchronize data movement on the serial
interface. It requires an external pullup resistor.
7
INT
Active-Low Interrupt Input/Output. The
INT pin is an I/O that is activated by
an external device to signify an event has occurred and should be logged.
Once the pin is activated, the event is recorded in the event-log memory and
the Event Counter Register is incremented. The TRx bits determine which
input edge(s) trigger an event: An event can be triggered by a falling edge on
the
INT pin, a rising edge, or by both the rising and falling edges.
The
INT pin can also be used as an output when the DS1678 is not in an
event-logging mission. The
INT pin becomes an output and generates an
alarm interrupt if the DISx bits are set to zero and the RTC reaches the preset
value in the alarm register. The
INT output remains low as long as the status
bit causing the interrupt is present and the DISx bits are set to zero.
The
INT pin is an open-drain input/output with a weak internal pulldown
resistor to prevent the pin from floating when the pin is tri-stated.
8
VCC
DC Power for Primary Power Supply
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