参数资料
| 型号： | DS1678+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 24/25页 |
| 文件大小： | 0K |
| 描述： | IC REAL TIME EVENT REC 8-DIP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 类型： | 时间事件记录器 |
| 特点： | 警报器，闰年，NVSRAM，Y2K |
| 存储容量： | 32B |
| 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： | 4.5 V ~ 5.5 V |
| 电压 - 电源，电池： | 2.6 V ~ 3.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-PDIP |
| 包装： | 管件 |
DS1678 Real-Time Event Recorder
8 of 25
POWER CONTROL
The device is fully accessible and data can be written and read when VCC is greater than VPF. However,
when VCC falls below V
PF, the internal registers are blocked from any access. The device power is
switched from VCC to VBAT when VCC drops below VBAT. Operation, except for the I
2C interface, is
maintained from the VBAT source until VCC is returned to nominal levels (Table 1). After VCC returns
above VPF, read and write access is allowed.
Table 1. Power Control
SUPPLY
CONDITION
READ/WRITE
ACCESS
POWERED
BY
VCC < VPF, VCC < VBAT
No
VBAT
VCC < VPF, VCC > VBAT
No
VCC
VCC > VPF, VCC > VBAT
Yes
VCC
OSCILLATOR CIRCUIT
The DS1678 uses an external 32.768kHz crystal. The oscillator circuit does not require any external
resistors or capacitors (CL) to operate. Table 2 specifies several crystal parameters for the external crystal,
and the oscillator block in the Block Diagram shows a functional schematic of the oscillator circuit. Using
a crystal with the specified characteristics, the startup time is usually less than one second.
Table 2. Crystal Specifications*
PARAMETER SYMBOL
MIN
TYP
MAX UNITS
Nominal Frequency
fO
32.768
kHz
Series Resistance
ESR
45
k
Load Capacitance
CL
12.5
pF
*
The crystal, traces, and crystal input pins should be isolated from RF generating signals. Refer to
Application Note 58: Crystal Considerations for Dallas Real-Time Clocks
for additional specifications.
CLOCK ACCURACY
The accuracy of the clock is dependent upon the accuracy of the crystal and the accuracy of the match
between the capacitive load of the oscillator circuit and the capacitive load for which the crystal was
trimmed. Additional error is added by crystal frequency drift caused by temperature shifts. External
circuit noise coupled into the oscillator circuit can result in the clock running fast. Figure 1 shows a
typical PC board layout for crystal and oscillator isolation from noise. Refer to Application Note 58:
Crystal Considerations with Dallas Real-Time Clocks for detailed information.
Figure 1. Typical Crystal Layout
LOCAL GROUND PLANE (LAYER 2)
CRYSTAL
X1
X2
GND
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1678+ | 功能描述:实时时钟 Real-Time Event Recorder 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 |
| DS1678J | 制造商:未知厂家 制造商全称:未知厂家 功能描述:2-Input Digital Multiplexer |
| DS1678J/A+ | 制造商:未知厂家 制造商全称:未知厂家 功能描述:2-Input Digital Multiplexer |
| DS1678K | 功能描述:KIT EVAL RT EVENT RECORD DS1678 RoHS:否 类别:编程器，开发系统 >> 过时/停产零件编号 系列:- 标准包装:1 系列:- 传感器类型:CMOS 成像，彩色（RGB） 传感范围:WVGA 接口:I²C 灵敏度:60 fps 电源电压:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相关产品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
| DS1678S | 功能描述:实时时钟 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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