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參數(shù)資料
| 型號： | KIT33989DWEVB |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 52/72頁 |
| 文件大?。?/td> | 0K |
| 描述： | KIT EVAL 33989DW HS SBC |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 主要目的： | 接口，CAN 控制器 |
| 嵌入式： | 是，MCU，8 位 |
| 已用 IC / 零件： | MC33989 |
| 主要屬性： | CAN 2.0 系統(tǒng)基礎(chǔ)芯片（SBC），SPI 接口，2 低壓降穩(wěn)壓器 |
| 次要屬性： | 故障檢測，睡眠和待機(jī)模式 |
| 已供物品： | 板，CD |
| 相關(guān)產(chǎn)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
56
Freescale Semiconductor
33989
TYPICAL APPLICATIONS
SUPPLEMENTAL APPLICATION NOTES
CAN Driver Overtemperature:
In case of an overtemperature condition at the CANH or CANL driver, the driver will be automatically disabled and the THERM
bit set in the CAN register. If enabled, an interrupt will be signalled. The GFAIL flag is set in the MCR register.
When the CAN is in an overtemperature situation, the device is no longer able to transmit. As soon as the temperature is below
the overtemperature level minus hysteresis, the CAN driver is automatically re-enabled.
The THERM bit is latched and two conditions are necessary to clear it:
No longer “CAN overtemperature situation” AND
Read operation of the CAN register.
Overcurrent Detection:
The CAN interface can detect and signal overcurrent condition, occurring for instance in case of CANL shorted to VBAT. This
is signalled by the bit CUR in the CAN register. An INT can be enabled, and GFAIL bit is set. The CUR bit is latched and two
conditions are necessary to clear it:
No longer “CAN overcurrent situation” AND
Read operation of the CAN register.
Protection
The MC33989 CAN output is protected for automotive environments.
The CAN driver is protected against overtemperature and overcurrent.
ISO7637 Transient
The CANH and CANL are rated from +40 Vdc to -27 Vdc. This means that the MC33989 CAN output can handle failure
situations like the bus directly shorted to the battery line in a load dump situation (+40 V).
Ground disconnection of the module will lead to the CANH and CANL line floating high to the VBAT supply. The rest of the
network will not be affected. However the CANH and CANL lines of the ungrounded module will see a negative voltage of the
VBAT value, with respect to their gnd level. Such situations can be handled by the CAN interface of the MC33989, but also in
cases of a jump start (battery at 27 V) and gnd disconnection.
Fast transient pulses, ISO7637-3. During these pulses, the maximum rating of the CANH and CANL lines of +40 Vdc and -27
Vdc must be respected.
ESD
The CANH and CANL line of the MC33989 are rated at ±4.0 kV. An external capacitor between CANH and CANL to gnd or a
zener diode suppressor can be added to ensure a higher module resistance to ESD.
Current in Case of Bus Short Conditions
In case of short-circuit condition on the CAN bus the current in the CAN supply, the CAN line can be different from the nominal
Figure 44. Current in Case of Bus Short Conditions
V2 Terminal
60 ohms
CANH line
CAN L line
I_H
I_L
I_TERM
CANH
CANL
5V
VBAT
5V
VBAT
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