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参数资料
| 型号： | KIT33989DWEVB |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 49/72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 |
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Analog Integrated Circuit Device Data
Freescale Semiconductor
53
33989
TYPICAL APPLICATIONS
SUPPLEMENTAL APPLICATION NOTES
Figure 38. Testing the CAN Interface
CAN LOW POWER MODE AND WAKE-UP
Low Power Mode
In low power mode the CAN is internally supplied from the
VSUP pin. The voltage at V2 pin can be either at 5.0 V or
turned off. The current sourced from V2, when the CAN is in
sleep mode, is extremely low. In most case the V2 voltage is
off, however the CAN can be set into sleep mode even with
5.0 V applied on V2.
In low power mode the CANH and CANL driver are
disabled, and the receiver is also disabled. CANH and CANL
have a typical 50 k ohm impedance to gnd. The wake-up
receiver can be activated if wake-up is enable by an SPI
command.
When the device is set back into TX RX mode by an SPI
command, CANH and CANL are set back into the recessive
level. This is illustrated in Figure 39.
Figure 39. Low Power Mode
Wake-up
When the CAN interface is in sleep mode with wake up
enabled, the CAN bus traffic is detected. The wake-up option
has to be enabled prior to setting the CAN in sleep mode. The
CAN bus wake-up is a pattern wake-up.
If the CAN is set into sleep mode with “wake-up disabled”,
bus traffic will not be detected by the MC33989.
CAN Wake-up Report: From the SBC in Sleep or Stop
Mode
The CAN wake-up reports depend upon the MC33989 low
power mode. If the MC33989 is set into Sleep mode (V1 and
V2 off), the CAN wake-up or any wake-up is reported to the
MCU by the V1 turn on, leading to MCU supply turn on and
reset release.
If the SBC is in stop mode (V2 of and V1 active), the CAN
wake-up or any wake-up is reported by a pulse on the INT
output.
CAN Wake-up Report: From the SBC in Normal or
Standby Mode
If the SBC is in normal or standby mode, and the CAN
interface is in sleep mode with wake-up enabled, the CAN
wake-up will be reported by the bit CANWU in the CAN
register.
In case the SBC uses such configuration, the SBC in
normal mode and CAN sleep mode with wake-up enable, it is
recommended to check for the CAN WU bit prior to setting
the MC33989 is sleep or stop mode, in case bus traffic has
occurred while the CAN interface was in sleep mode.
V1
VSUP
V2CTRL
RESET
INT
CS
MISO
MOSI
SCK
TX
RX
CANH
CANL
HS1
L0
L3
C3
C4
C1
C2
RT
GND
CAN bus
WD
V2
L2
L1
Signal generator
Components list:
C1: 22uF, C2: 100nF
C3: >10uF
C4: 100nF
CANL
CANH
Signal at RX output
Rt: 60 ohms
F<500kz (1Mb/s)
MC33989
RST
CANL
CANH
TX
RX
GND
2.5V
CANL-DOM
CANH-DOM
CANL/CANH-REC
CAN in Normal mode
CAN in Sleep mode
(wake-up enable or disable)
CAN in TX RX mode
(controlled by SPI command)
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