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| 型号： | MCP2510-E/P |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 1 CHANNEL(S), 1M bps, LOCAL AREA NETWORK CONTROLLER, PDIP18 |
| 封装： | 0.300 INCH, PLASTIC, DIP-18 |
| 文件页数： | 32/80页 |
| 文件大小： | 998K |
| 代理商： | MCP2510-E/P |
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MCP2510
DS21291F-page 38
2007 Microchip Technology Inc.
FIGURE 5-3:
SHORTENING A BIT PERIOD
5.8
Programming Time Segments
Some requirements for programming of the time seg-
ments:
Prop Seg + Phase Seg 1 >= Phase Seg 2
Prop Seg + Phase Seg 1 >= TDELAY
Phase Seg 2 > Sync Jump Width
For example, assuming that a 125 kHz CAN baud rate
with FOSC = 20 MHz is desired:
TOSC = 50 nsec, choose BRP<5:0> = 04h, then TQ =
500 nsec. To obtain 125 kHz, the bit time must be 16
TQ.
Typically, the sampling of the bit should take place at
about 60-70% of the bit time, depending on the system
parameters. Also, typically, the TDELAY is 1-2 TQ.
Sync Seg = 1 TQ; Prop Seg = 2 TQ; So setting Phase
Seg 1 = 7 TQ would place the sample at 10 TQ after the
transition. This would leave 6 TQ for Phase Seg 2.
Since Phase Seg 2 is 6, by the rules, SJW could be the
maximum of 4 TQ. However, normally a large SJW is
only necessary when the clock generation of the differ-
ent nodes is inaccurate or unstable, such as using
ceramic resonators. So an SJW of 1 is typically
enough.
5.9
Oscillator Tolerance
The bit timing requirements allow ceramic resonators
to be used in applications with transmission rates of up
to 125 kbit/sec, as a rule of thumb. For the full bus
speed range of the CAN protocol, a quartz oscillator is
required. A maximum node-to-node oscillator variation
of 1.7% is allowed.
Input Signal
Sync
Prop
Segment
Phase
Segment 1
Phase
Segment 2
≤ SJW
Sample
Actual
Nominal
Bit Length
TQ
Point
Bit Length
相关PDF资料 |
PDF描述 |
|---|---|
| MCP2510-IST | 1 CHANNEL(S), 1M bps, LOCAL AREA NETWORK CONTROLLER, PDSO20 |
| MCP2510-E/ST | 1 CHANNEL(S), 1M bps, LOCAL AREA NETWORK CONTROLLER, PDSO20 |
| MCP2515T-E/SO | 1 CHANNEL(S), 1M bps, SERIAL COMM CONTROLLER, PDSO18 |
| MCP2515-E/STG | 1 CHANNEL(S), 1M bps, SERIAL COMM CONTROLLER, PDSO20 |
| MCP2515-I/ML | 1 CHANNEL(S), 1M bps, SERIAL COMM CONTROLLER, PQCC20 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MCP2510-ESO | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Stand-Alone CAN Controller with SPI Interface |
| MCP2510-EST | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Stand-Alone CAN Controller with SPI Interface |
| MCP2510-I/P | 功能描述:网络控制器与处理器 IC Stand-alone CAN RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| MCP2510-I/P | 制造商:Microchip Technology Inc 功能描述:IC CAN CONTROLLER 2510 DIP18 |
| MCP2510-I/SO | 功能描述:网络控制器与处理器 IC Stand-alone CAN RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
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