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| 型号： | MCP79401T-I/ST |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | REAL TIME CLOCK, PDSO8 |
| 封装： | 4.40 MM, ROHS COMPLIANT, PLASTIC, TSSOP-8 |
| 文件页数： | 8/40页 |
| 文件大小： | 817K |
| 代理商： | MCP79401T-I/ST |
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MCP7940X
DS25009B-page 16
2011 Microchip Technology Inc.
4.2.5
CRYSTAL SPECS
The MCP7940X has been designed to operate with a
standard 32.768 kHz tuning fork crystal. The on-board
oscillator has been characterized to operate with a
crystal of maximum ESR of 70K Ohms.
Crystals with a comparable specification are also suit-
able for use with the MCP7940X.
The table below is given as design guidance and a
starting point for crystal and capacitor selection.
EQUATION 4-1:
The following must also be taken into consideration:
Pin capacitance (to be included in Cx2 and Cx1)
Stray Board Capacitance
The recommended board layout for the oscillator area
is shown in Figure 4-3. This actual board shows the
crystal and the load capacitors. In this example, C2 is
CX1, C3 is CX2 and the crystal is designated as Y1.
FIGURE 4-3:
BOARD LAYOUT
Gerber files are available from www/microchip.com/
rtcc.
It is required that the final application should be tested
with the chosen crystal and capacitor combinations
across all operating and environmental conditions.
Please also consult with the crystal specification to
observe correct handling and reflow conditions and for
information on ideal capacitor values.
For more information please see AN1365, “RTCC Best
Practices Application Note” (DS01365).
Manufacturer
Part Number
Crystal
Capacitance
CX1 Value
CX2 Value
Micro Crystal
CM7V-T1A
7pF
10pF
12pF
Citizen
CM200S-32.768KDZB-UT
6pF
10pF
8 pF
Please work with your crystal vendor.
Cload
CX2 CX1
CX2
CX1
+
-----------------------------
Cstray
+
=
相关PDF资料 |
PDF描述 |
|---|---|
| MCP79401-I/MNY | REAL TIME CLOCK, PDSO8 |
| MCP7940NT-I/MNY | REAL TIME CLOCK, PDSO8 |
| MCP7940N-I/SN | REAL TIME CLOCK, PDSO8 |
| MCP7940N-I/MS | REAL TIME CLOCK, PDSO8 |
| MCP7940NT-I/ST | REAL TIME CLOCK, PDSO8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MCP79402 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:I2C? Real-Time Clock/Calendar with SRAM, Unique ID and Battery Switchover |
| MCP79402-I/MS | 功能描述:实时时钟 I2C GP RTCC 64B SRAM EUI-64 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 |
| MCP79402-I/SN | 功能描述:实时时钟 I2C GP RTCC 64B SRAM EUI-64 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 |
| MCP79402-I/ST | 功能描述:实时时钟 I2C GP RTCC 64B SRAM EUI-64 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 |
| MCP79402T-I/MNY | 功能描述:实时时钟 I2C GP RTCC 64B SRAM EUI-64 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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