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| 型号： | DS1302Z/T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/13页 |
| 文件大小： | 0K |
| 描述： | IC TIMEKEEPER T-CHARGE 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 时钟/日历 |
| 特点： | 闰年，NVSRAM，涓流充电器 |
| 存储容量： | 31B |
| 时间格式： | HH:MM:SS（12/24 小时） |
| 数据格式： | YY-MM-DD-dd |
| 接口： | 3 线串口 |
| 电源电压： | 2 V ~ 5.5 V |
| 电压 - 电源，电池： | 2 V ~ 5.5 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
DS1302 Trickle-Charge Timekeeping Chip
5 of 13
OSCILLATOR CIRCUIT
The DS1302 uses an external 32.768kHz crystal. The oscillator circuit does not require any external resistors or
capacitors to operate. Table 1 specifies several crystal parameters for the external crystal. Figure 1 shows a
functional schematic of the oscillator circuit. If using a crystal with the specified characteristics, the startup time is
usually less than one second.
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 will be added by crystal frequency drift caused by temperature shifts. External circuit noise coupled into the
oscillator circuit may result in the clock running fast. Figure 2 shows a typical PC board layout for isolating the
crystal and oscillator from noise. Refer to
Application Note 58: Crystal Considerations for Dallas Real-Time Clocks
for detailed information.
Table 1. Crystal Specifications*
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
Nominal Frequency
fO
32.768
kHz
Series Resistance
ESR
45
k
Ω
Load Capacitance
CL
6
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.
Figure 2. Typical PC Board Layout for Crystal
LOCAL GROUND PLANE (LAYER 2)
CRYSTAL
X1
X2
GND
NOTE: AVOID ROUTING SIGNALS IN THE
CROSSHATCHED AREA (UPPER LEFT-
HAND QUADRANT) OF THE PACKAGE
UNLESS THERE IS A GROUND PLANE
BETWEEN THE SIGNAL LINE AND THE
PACKAGE.
COMMAND BYTE
Figure 3 shows the command byte. A command byte initiates each data transfer. The MSB (bit 7) must be a logic
1. If it is 0, writes to the DS1302 will be disabled. Bit 6 specifies clock/calendar data if logic 0 or RAM data if logic 1.
Bits 1 to 5 specify the designated registers to be input or output, and the LSB (bit 0) specifies a write operation
(input) if logic 0 or read operation (output) if logic 1. The command byte is always input starting with the LSB (bit 0).
Figure 3. Address/Command Byte
1
RAM
CK
A4
A3
A2
A1
A0
RD
WR
7654
3210
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1304FP000 | 制造商:Thomas & Betts 功能描述:100A,CON,3P4W,MG,304,277/480V |
| DS1304MP000 | 制造商:Thomas & Betts 功能描述:100A,PLG,3P4W,MG,304,277/480V |
| DS1304MR000 | 制造商:Thomas & Betts 功能描述:100A,NTL,3P4W,MG,304,277/480V |
| DS1304MRAB0 | 制造商:Thomas & Betts 功能描述:100A,NLT,3P4W,MG,304,AB0,277/480V |
| DS1305 | 功能描述:实时时钟 Serial Alarm RTC 3-Wire 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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