参数资料
型号: KIT33989DWEVB
厂商: Freescale Semiconductor
文件页数: 50/72页
文件大小: 0K
描述: KIT EVAL 33989DW HS SBC
标准包装: 1
主要目的: 接口,CAN 控制器
嵌入式: 是,MCU,8 位
已用 IC / 零件: MC33989
主要属性: CAN 2.0 系统基础芯片(SBC),SPI 接口,2 低压降稳压器
次要属性: 故障检测,睡眠和待机模式
已供物品: 板,CD
相关产品: MC33989DWR2CT-ND - IC SYSTEM BASE W/CAN 28-SOIC
MC33989DWR2TR-ND - IC SYSTEM BASE W/CAN 28-SOIC
MC33989DW-ND - IC SYSTEM BASE W/CAN 28-SOIC
Analog Integrated Circuit Device Data
54
Freescale Semiconductor
33989
TYPICAL APPLICATIONS
SUPPLEMENTAL APPLICATION NOTES
CAN Wake-up Report in the SPI Registers
After a CAN wake-up, a flag is set in the CAN register. Bit CAN-WU reports a CAN wake-up event while the SBC was in sleep,
stop, normal or standby mode. This bit is set until the CAN is set by the SPI command in normal mode and CAN register read.
Pattern Wake-up
In order to wake-up the CAN interface, the following criteria must be fulfilled:
The CAN interface wake-up receiver must receive a series of 3 consecutive valid dominant pulses, each of them has to be
longer than 500 ns and shorter than 500
s.
The distance between 2 pulses must be lower than 500
s and the three pulse must occur within a time frame of 1.0 ms.
Figure 40. Pattern Wake-up
The following figure illustrates the SBC key signals when a CAN wake-up occurs in Sleep or Stop mode.
Figure 41. SBC Key Signals
CANL
CANH
TX
RX
GND
2.5V
CANL-DOM
CANH-DOM
CANL/CANH-REC
MC33989 CAN in Tx Rx mode
MC33989 CAN in Sleep mode (wake-up enable)
Incoming CAN message
CANL-DOM
CANH-DOM
CANL-DOM
CANH-DOM
CANL-DOM
CANH-DOM
WU receiver
Internal wake-up signal
min 500ns
max 500us
CAN bus sleep state
Pulse # 1
Pulse # 2
Pulse # 3
CAN wake-up: SBC in sleep mode. V1 turn on.
CAN wake-up: SBC in stop mode. INT pulse
TX sending node.
VDD start
CAN bus
INT
Terminal
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