mc33789 Freescale Semiconductor, Inc, mc33789 Datasheet - Page 49

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

Table 8. SPI Sensor Data, - Message Format
address of each of all 12 possible satellite sensors and one
Analog Integrated Circuit Device Data
Freescale Semiconductor
Table 9. SPI Sensor Data, - Message Bit Definition
SENSOR DATA REQUEST SI BIT DEFINITION
SENSOR DATA RESPONSE SO BIT DEFINITION
SQ2:SQ0
LC3:LC0
SQ2:SQ0
ES1:ES0
ST1:ST0
Name
Name
The Logic Channel Field (LC3:LC0) is used for the
D9:D0
SEN
CNC
OE
ND
HE
ME
DE
P
Bit Position
Bit Position
15, 14, 12
15:13
11:10
3:0
9:8
9:0
13
12
5
4
3
2
1
0
Sequence identifier - used for synchronizing samples
Sensor bit - Defines the request as a sensor data request or a non-sensor data request (1 = sensor data, 0 = non-sensor data)
Logical channel select
Sequence identifier - used for synchronizing sensor samples
Parity - Ensures odd parity for bits 15:0 of SO
Status - Identifies the contents in D9:D0 of SO (sensor data, self-test data, error, etc.)
Exception Status - Identifies the contents of exception data (Receiver/On-board Sensor Error Status, or Satellite Error)
Over-current Error - Over-current of the low side driver (short to battery)
No data (channel specific) - Sensor data not available
Conditions Not Correct for operation (channel specific) as defined elsewhere - Request cannot be fulfilled because the channel is off,
or in the wrong mode, etc.
Hardware Error in slave (channel/channel pair specific) - caused by hardware errors defined elsewhere, such as over-temperature
over-current of the high side driver (short to GND), reference out of range, etc.
Manchester error (channel specific) - incorrect number of bits, timing violation, etc. in Manchester bit-stream
Data error (channel specific) - Parity or CRC error in Manchester data
Sensor Data - For ST1:ST0 = 01
Table 10. Logic Channel Assignment
Logic Channel
(LC3: LC0)
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
0
1
1
1
0
1
Physic Channel
A_SENSOR
PSI5_1
PSI5_1
PSI5_1
PSI5_1
PSI5_2
PSI5_2
PSI5_2
PSI5_2
PSI5_3
PSI5_3
PSI5_3
PSI5_3
PSI5_4
PSI5_4
PSI5_4
x
x
x
x
x
x
x
x
x
x
x
x
analog sensor. Each sensor address along with its channel
and time slot on the bus, is assigned in
Time Slot
Definition
Definition
N/A
x
x
x
1
2
3
1
2
3
1
2
3
1
2
3
-
-
-
SENSOR MESSAGE, OPERATION COMMAND AND SPI
x
x
x
x
x
x
ASENSOR_RG
Data Register
PSI5_1 RG_A
PSI5_1 RG_B
PSI5_1 RG_C
PSI5_2 RG_A
PSI5_2 RG_B
PSI5_2 RG_C
PSI5_3 RG_A
PSI5_3 RG_B
PSI5_3 RG_C
PSI5_4 RG_A
PSI5_4 RG_B
PSI5_4 RG_C
x
x
N/A
N/A
N/A
Reserved
Used for Non-sensor Data Responses
Reserved
FUNCTIONAL DEVICE OPERATION
Table
10.
33789
49