OPERATIONAL MODES After a CAN wake-up, a fl" />
參數(shù)資料
型號： MC33742DW
廠商： Freescale Semiconductor
文件頁數(shù)： 37/71頁
文件大?。?/td> 0K
描述： IC SYSTEM BASE W/LIN 28-SOIC
標(biāo)準(zhǔn)包裝： 26
應(yīng)用： 自動
接口： SPI
電源電壓： 5.5 V ~ 18 V
封裝/外殼： 28-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 28-SOIC W
包裝： 管件
安裝類型： 表面貼裝
配用： KIT33742DWEVB-ND - KIT FOR 33742 SBC WITH EHSCAN
Analog Integrated Circuit Device Data
42
Freescale Semiconductor
33742
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
After a CAN wake-up, a flag is set in the CAN register. Bit CANWU reports the CAN wake-up event while the 33742 was in
Sleep or Stop mode. This bit is set until the CAN is in placed by SPI command into TXRX mode and the CAN register can be read.
CAN BUS DIAGNOSTIC
The SBC can diagnose CANH or CANL lines short to GND, shorts to VSUP or VDD.
As illustrated in Figure 24, several single-ended comparators are implemented on the CANH and CANL bus lines. These
comparators monitor the bus voltage level in the recessive and dominant states. This information is then managed by a logic
circuit to determine if a failure has occurred and to report it. Table 11 indicates the state of the comparators in the event of bus
failure and the state of the drivers; that is, whether they are recessive or dominant.
Figure 24. CAN Bus Simplified Structure
DETECTION PRINCIPLE
In the recessive state, if one of the two bus lines is shorted to GND, VDD, or VSUP, then voltage at the other line follows the
shorted line due to bus termination resistance and the high-impedance of the driver. For example, if CANL is shorted to GND,
CANL voltage is zero, and CANH voltage, as measured by the Hg comparator, is also close to zero.
Table 11. Short to GND, Short to VSUP, and Short to 5.0 V (VDD) Detection Truth Table
Failure Description
Driver Recessive State
Driver Dominant State
Lg (Threshold 1.75 V)
Hg (Threshold 1.75 V)
Lg (Threshold 1.75 V)
Hg (Threshold 1.75 V)
No failure
1
0
1
CANL to GND
0
1
CANH to GND
0
Lb (Threshold VSUP-2.0 V) Hb (Threshold VSUP-2.0 V) Lb (Threshold VSUP-2.0 V) Hb (Threshold VSUP-2.0 V)
No failure
0
CANL to VSUP
1
CANH to VSUP
1
0
1
L5 (Threshold VDD-0.43 V) H5 (Threshold VDD-0.43 V) L5 (Threshold VDD-0.43 V)
H5
(Threshold VDD-0.43 V)
No failure
0
CANL to VDD
1
CANH to VDD
1
0
1
Hg
CANH
CANL
Lg
VDD
VRG
Hb
VRVB
Lb
VRVB
Logic
TXD
Diagnostic
VDD (5.0 V)
GND (0.0 V)
Recessive Level (2.5 V)
VSUP (12V–14 V)
VRVB (VSUP -2.0 V)
VRG (1.75 V)
CANL Dominant Level (1.4 V)
CANH Dominant Level (3.6 V)
L5
VR5
H5
VR5
VR5 (VDD -0.43 V)
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