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| 型号： | KIT33989DWEVB |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 47/72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
51
33989
TYPICAL APPLICATIONS
SUPPLEMENTAL APPLICATION NOTES
If “CANH minus CANL” is above the threshold, the bus is dominant and RX is set low. This is illustrated in Figure 36.
Figure 35. CAN Driver Operation in Normal Mode
TX and RX Pins
The TX pin has an internal pull up to V2. The state of TX depends on the V2 status. RX is a push-pull structure, supplied by
V2. When V2 is set at 5.0 V, and CAN is in normal mode, RX reports the bus status. When V2 is off RX is low.
Normal Mode and Slew Rate Selection
The slew rate selection is done via the SPI. Four slew rates are available. The slew rate affects the recessive to dominant and
dominant to recessive transitions. This affect is also the delay time from the TX pin to the bus, and from the bus to RX. The loop
time is thus affected by the slew rate selection.
The following figure is an illustration of the slew rate on CANH, CANL, TX and RX.
Figure 36. Normal Mode and Slew Rate Selection
Minimum Baud Rate
As TX permanent dominant is detected after TDOUT (min 200 s), a minimum Baud rate is required in order to get good
behavior: once TX permanent dominant is detected the CAN driver is off.
The maximum number of consecutive dominant bits in a frame is 12 (6 bits of active error flag and its echo error flag).
200 s/12 = 16.7 s. The minimum Baud rate is 1/6.7 s = 60 KB.
Termination
The MC33989 supports the two main types of bus termination:
Differential termination resistors between CANH and CANL lines.
Split termination concept, with mid point of the differential termination connected to gnd through a capacitor.
CANH
TX
RX
2.5V
CANH-DOM
CANH-REC
CANL
2.5V
CANL-DOM
CANL-REC
CANH-CANL
CAN signal with slew rate 0 selected
CAN signal with slew rate 3 selected
R=60 ohms, CL = CH = 100pF
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