mc33789 Freescale Semiconductor, Inc, mc33789 Datasheet - Page 3

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

Table 1. 33789 Pin Definitions
Analog Integrated Circuit Device Data
Freescale Semiconductor
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
A functional description of each pin can be found in the Functional Pin Description section beginning on
Pin
Pin Name
GND_PSI
Transparent Top View
SCRAP
PSI5_1
PSI5_2
PSI5_3
PSI5_4
CS_C
ASST
CS_B
CS_A
SCK
CLK
SO
SI
Input/Output
Input/Output
Input/Output
Input/Output
Function
Ground
Output
Input
Input
Input
Input
Input
Input
Input
Input
Pin
SATSYNC
GND_PSI
SCRAP
PSI5_1
PSI5_2
PSI5_3
PSI5_4
CS_C
ASST
CS_B
CS_A
SCK
CLK
SO
CS
SI
Analog Sensor Self-test
Satellite Sensor Clock
PSI5 Interface 1
PSI5 Interface 2
PSI5 Interface 3
PSI5 Interface 4
Formal Name
Chip Select C
Chip Select B
Chip Select A
SPI Data Out
PSI Ground
SPI Data In
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
SPI Clock
Scrap
17 18 19
64 63 62
Figure 3. 33789 Pin Connections
PIN CONNECTIONS
20
61
21
60
22 23
59 58
Active high input to initiate analog sensor self-test
Active low SPI monitor chip select input dedicated for on-board sensor C.
Active low SPI monitor chip select input dedicated for on-board sensor B
Active low SPI monitor chip select input dedicated for on-board sensor A
Scrap command input
PSI5 standard interface 1 as satellite sensor channel 1
PSI5 standard interface 2 as satellite sensor channel 2
PSI5 standard interface 3 as satellite sensor channel 3
PSI5 standard interface 4 as satellite sensor channel 4
Dedicated ground point for PSI5 sensor
SPI data output
SPI data input
SPI clock input
Clock input for the PSI5 sensor interface(s) running in synchronous
operation mode
24 25 26 27 28 29 30 31 32
57 56 55 54 53 52 51 50 49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
Definition
BUCKCOMP1
BUCKCOMP2
BSTCOMP1
BSTCOMP2
VDD
VSS
VCC
GNDA
VCCDRI
DISARM
ARM
RESET
AOUT
RXD
TXD
A_SENSOR
page
PIN CONNECTIONS
25.
33789
3