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参数资料
型号： MC33889DPEGR2
厂商： Freescale Semiconductor
文件页数： 31/59页
文件大小： 0K
描述： IC SYSTEM BASE W/CAN 28SOIC
标准包装： 1,000
系列： *
Analog Integrated Circuit Device Data
Freescale Semiconductor
37
33889
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
GND SHIFT DETECTION
GENERAL
When normally working in two-wire operating mode, the CAN transmission can afford some ground shift between different
nodes without trouble. Should a bus failure occur, the transceiver switches to single-wire operation, therefore working with less
noise margin. The affordable ground shift is decreased.
The SBC provides a ground shift detection for diagnosis purpose. The four ground shift levels are selectable and the detection
is stored in the IOR register which is accessible via the SPI.
DETECTION PRINCIPLE
The GND shift to detect is selected via the SPI from 4 different values (-0.3 V, -0.7 V, -1.2 V, -1.7 V). At each TX falling edge
(end of recessive state), the CANH voltage is sensed. If it is detected to be below the selected gnd shift threshold, the bit SHIFT
is set at 1 in the IOR register. No filter is implemented. Required filtering for reliable detection should be done by software (e.g.
several trials).
DEVICE STATE DESCRIPTION
Table 7. 33889 Table of Operations
The table below describe the SBC operation modes.
Mode
Voltage
Regulator
HS1 switch
Wake-up capabilities
(if enabled)
Reset Pin
INT
Software
Watchdog
CAN cell
Normal Request
VDD1: ON
V2: OFF
HS1: OFF
Low for 1.0 ms,
then high
term VBAT
Normal
VDD1: ON
V2: ON
HS1 controllable
Normally high.
Active low if W/D
or VDD1 under
voltage occur
If enabled,
signal failure
(VDD pre
warning temp,
CAN, HS1)
Running
Term VBAT
Tx/Rx
Rec only
Standby
VDD1: ON
V2: OFF
HS1 controllable
Normally high.
Active low if W/D
or VDD1 under
voltage occur
If enabled,
signal failure
(VDD temp,
HS1)
Running
Term VBAT
Tx/Rx
Rec only
Stop
VDD1: ON
(limited current
capability)
V2: OFF
HS1: OFF or cyclic
CAN (always enable)
SPI and L0,L1
Cyclic sense or
Forced Wake-up
Normally high.
Active low if W/D
or VDD1 under
voltage occur
Signal SBC
wake-up
(not maskable)
- Running if
enabled
- Not Running
if disabled
Term VBAT
Sleep
VDD1: OFF
V2: OFF
HS1 OFF or cyclic
CAN (always enable
SPI and L0,L1
Cyclic sense
Forced Wake-up
Low
Not active
No Running
Term VBAT
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