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| 型号： | MCP2515T-E/ML |
| 厂商： | Microchip Technology |
| 文件页数： | 49/88页 |
| 文件大小： | 0K |
| 描述： | IC CAN CONTROLLER W/SPI 20-QFN |
| 标准包装： | 3,300 |
| 控制器类型： | CAN 接口 |
| 接口： | SPI 串行 |
| 电源电压： | 2.7 V ~ 5.5 V |
| 电流 - 电源： | 10mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-VFQFN 裸露焊盘 |
| 供应商设备封装： | 20-QFN 裸露焊盘（4x4） |
| 包装： | 带卷 (TR) |
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2010 Microchip Technology Inc.
DS21801F-page 53
MCP2515
8.0
OSCILLATOR
The MCP2515 is designed to be operated with a crystal
or ceramic resonator connected to the OSC1 and
OSC2 pins. The MCP2515 oscillator design requires
the use of a parallel cut crystal. Use of a series cut
crystal may give a frequency out of the crystal
manufacturer’s specifications. A typical oscillator circuit
is shown in Figure 8-1. The MCP2515 may also be
driven by an external clock source connected to the
OSC1 pin, as shown in Figure 8-2 and Figure 8-3.
8.1
Oscillator Startup Timer
The MCP2515 utilizes an Oscillator Startup Timer
(OST) that holds the MCP2515 in reset to ensure that
the oscillator has stabilized before the internal state
machine begins to operate. The OST maintains reset
for the first 128 OSC1 clock cycles after power-up or a
wake-up from Sleep mode occurs. It should be noted
that no SPI protocol operations should be attempted
until after the OST has expired.
8.2
CLKOUT Pin
The CLKOUT pin is provided to the system designer for
use as the main system clock or as a clock input for
other devices in the system. The CLKOUT has an inter-
nal prescaler which can divide FOSC by 1, 2, 4 and 8.
The CLKOUT function is enabled and the prescaler is
selected
via
the
CANCNTRL
register
(see
The CLKOUT pin will be active upon system reset and
default to the slowest speed (divide by 8) so that it can
be used as the MCU clock.
When Sleep mode is requested, the MCP2515 will
drive sixteen additional clock cycles on the CLKOUT
pin before entering Sleep mode. The idle state of the
CLKOUT pin in Sleep mode is low. When the CLKOUT
function is disabled (CANCNTRL.CLKEN = ‘0’) the
CLKOUT pin is in a high-impedance state.
The CLKOUT function is designed to ensure that
thCLKOUT and tlCLKOUT timings are preserved when the
CLKOUT pin function is enabled, disabled or the
prescaler value is changed.
FIGURE 8-1:
CRYSTAL/CERAMIC RESONATOR OPERATION
FIGURE 8-2:
EXTERNAL CLOCK SOURCE
Note:
The maximum frequency on CLKOUT is
specified as 25 MHz (See Table 13-5)
C1
C2
XTAL
OSC2
RS(1)
OSC1
RF(2)
SLEEP
To internal logic
Note 1: A series resistor (RS) may be required for AT strip cut crystals.
2: The feedback resistor (RF ), is typically in the range of 2 to 10 M
Ω.
Clock from
external system
OSC1
OSC2
Open
(1)
Note 1: A resistor to ground may be used to reduce system noise. This may increase system current.
2: Duty cycle restrictions must be observed (see Table 12-1).
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MCP2515T-I/M | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Stand-Alone CAN Controller with SPI Interface |
| MCP2515T-I/ML | 功能描述:网络控制器与处理器 IC CAN controller with SPI interface 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 |
| MCP2515T-I/SO | 功能描述:网络控制器与处理器 IC W/ SPI Interface 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 |
| MCP2515T-I/SO-CUT TAPE | 制造商:Microchip 功能描述:MCP2515 Series 5.5 V 1 Mb/s Stand Alone SPI Interface CAN Controller- SOIC-18 |
| MCP2515T-I/ST | 功能描述:网络控制器与处理器 IC W/ SPI Interface 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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