mc33789 Freescale Semiconductor, Inc, mc33789 Datasheet - Page 50

• Manufacturer Part Number: mc33789
• Description: Airbag System Basis Chip Sbc With Power Supply And Psi5 Sensor Interface
• Manufacturer: Freescale Semiconductor, Inc

FUNCTIONAL DEVICE OPERATION
SENSOR MESSAGE, OPERATION COMMAND AND SPI
interface, subsequent requests for the data from the same
logic channel will result in an ERROR response with the No
Data bit set (ND = ’1’).
Table 11. SPI Sensor Data Request, - Error and Status Bit Setting
Non-sensor Message Format
50
33789
Correct Start Bits Received
OE
ND
CNC
HE
ME
DE
SPI LINE_ENABLE (xLE=0)
After the data from a given logic channel is read via the SPI
Non-sensor messages are used for all of configurations,
Bit
CH I
Satellite Parity Error
CH Short to GND
Invalid Bit Timing
Invalid Bit Count
Q
CH Short to V+
CH Over-temp
Over-current Error
No Data
Conditions Not Correct
Hardware Error
Manchester Error
Data Error
Out of Range
CH ON
Description
Figure 49. SPI Sensor Data Response, - Error Bit Logic
Satellite channel low side over-
current (short to V+ condition) and no
hardware error (HE) detected
Channel is ON, no Manchester error,
data error or over-current error is
detected and a valid satellite frame
has not been received
Request for undefined channel or
request for a channel not turned ON
Any of the following:
1. Satellite channel high side over-
current (short to GND condition)
2. Satellite average I
3. Channel over-temperature
conditions
Improper Manchester data - incorrect
number of data bits, incorrect data
edge timing, with no over-current or
hardware errors detected
Satellite data parity error, with no
over-current error or hardware error
detected
Setting Condition
Q
is out of range
Sensor Data Request messages are defined in
diagnostics, controls, etc. data traffic. Their message formats
and bit definitions are listed in
The conditions for setting and clearing of status bits in the
Internal reset or
LINE_ENABLED command
with xLE = 0 (OFF) for the
affected channel
Cleared after a valid satellite
data frame is received
Internal reset, or upon
requesting a valid channel
after it has been turned ON
Internal reset, or
LINE_ENABLE command with
xLE = 0 (OFF) for the affected
channel
Internal reset, or cleared when
read
Internal reset, or cleared when
read
Clearing Condition
Analog Integrated Circuit Device Data
Table 12
S
R
S
R
S
R
S
R
S
R
Freescale Semiconductor
Channel is deactivated
None
None
Channel is deactivated
None
None
SET
CLR
SET
CLR
SET
CLR
SET
CLR
SET
CLR
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Channel Behavior
and
Table
Table
HE
OE
ND
ME
DE
13.
11.