mc33789 Freescale Semiconductor, Inc, mc33789 Datasheet - Page 51

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

Table 12. SPI Non-sensor Data, - Message Format
OPERATIONAL-MODE SPI COMMANDS
PSI5 Interface SPI commands
SENSOR_DATA
data from the PSI5 interface and the analog sensor input.
This is the only command that uses the sensor data request/
response format. The details of this command are defined in
Table
Analog Integrated Circuit Device Data
Freescale Semiconductor
Table 13. SPI Non-sensor Data, Message Bit Definition
SLAVE COMMAND SI BIT DEFINITION
SLAVE RESPONSE SO BIT DEFINITION
SI
SO
OP1:OP0
OP1:OP0
ES1:ES0
ST1:ST0
Name
Name
The SENSOR_DATA command is used to sample sensor
D7:D0
D7:D0
A4:A0
SEN
RE
SE
MSB
MSB
p
OP1
8,
15
15
⇓
0
0
1
1
0
Table
OP0 SEN
OP1 OP0
Bit Position
Bit Position
14
14
⇓
0
1
0
1
⇓
0
0
1
1
15:14
14:13
11:10
12:8
9,
7:0
9:8
7:0
13
12
2
1
13
13
Table 10
0
0
0
0
⇓
0
1
0
1
A4
12
12
P
P
P
P
P
x
x
Opcode - Defines operation (Read, Write)
Sensor bit - Defines the request as a sensor data request or non-sensor data request (1 = sensor data, 0 = non-sensor data)
Address - For read or write operation
Data - For write operation
Opcode - Identifies the contents of Read or Write data in D9:D0 - copied from SI if the request is granted
Parity - Ensures odd parity for bits 15:0 of SO
Status - Always ‘11’ for non-sensor response
Exception Status - Always ‘10’ for non-sensor response
Read Data/ Error Data/ Status
SPI Error - set to ‘1’ for request (SI) frame violations (incorrect number of SCK pulses, etc.)
Request Error - set to ‘1’ for illegal, or unknown requests
and
ST1
11
A3
11
x
x
1
1
1
1
Write Address
Read Address
Table
ST0
A2
10
10
x
x
1
1
1
1
11.
ES1
A1
9
x
x
9
1
1
1
1
ES0
A0
8
x
x
8
0
0
0
0
D7
D7
7
x
x
x
7
0
x
D6
D6
6
6
0
x
x
x
x
D5
D5
5
5
0
x
x
x
x
Slave Status
Read Data
Write Data
D4
D4
4
x
x
x
4
0
x
LINE_MODE (0x4F, 0x8F)
receiver channels individually, for either Synchronous TDM
Mode or Satsync-Steered. The command is latched until a
subsequent SPI update or internal reset. The response
indicates the current state of the line mode for each channel.
The LINE_MODE command is used to configure the PSI5
Definition
Definition
D3
D3
3
3
0
x
x
x
x
SENSOR MESSAGE, OPERATION COMMAND AND SPI
D2
D2
SE
2
x
x
x
2
x
RE
D1
D1
1
x
x
x
1
x
LSB
LSB
D0
D0
0
x
x
x
0
0
x
Slave Data Request
Operand Decode:
Reserved
Write
Read
Test
Slave Data Response
Error Response
Write Response
Read Response
Test Response
FUNCTIONAL DEVICE OPERATION
33789
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