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| 型號： | MCP2510T-E/P |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 2 CHANNEL(S), 1M bps, LOCAL AREA NETWORK CONTROLLER, PDIP18 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-18 |
| 文件頁數(shù)： | 32/76頁 |
| 文件大?。?/td> | 1076K |
| 代理商： | MCP2510T-E/P |
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MCP2510
DS21291C-page 38
Preliminary
1999 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 =
500nsec. 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
T
Q
Point
Bit Length
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| MCP2510T-I/SO | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC Stand-alone CAN RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| MCP2510T-I/ST | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC Stand-alone CAN RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
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| MCP2515_12 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Stand-Alone CAN Controller with SPI Interface |
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