mc33789 Freescale Semiconductor, Inc, mc33789 Datasheet - Page 5

• 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 (continued)
Analog Integrated Circuit Device Data
Freescale Semiconductor
Number
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
A functional description of each pin can be found in the Functional Pin Description section beginning on
Pin
BUCKCOM
BUCKCOM
BUCKGND
VBUCK_R
Pin Name
VERDIAG
BUCKSW
BSTGND
BSTSW
CPGND
VSYNC
VBUCK
ERSW
WAKE
VPWR
CPC2
CPC1
VBST
VER
P2
P1
Input/output
Function
Ground
Ground
Ground
Output
Output
Output
Output
Output
Input
Input
Input
Input
Input
Input
Input
Input
Input
Pin
Buck Compensation pin2
Buck Compensation pin1
Boost Converter Ground
Energy Reserve Voltage
Charge Pump Capacitor
Charge Pump Capacitor
Buck Converter Ground
Energy Reserve Switch
Charge Pump Ground
Buck Converter Input
Sensor Sync Power
Boost Voltage Input
Redundant Input
Energy Reserve
Buck Converter
Formal Name
Power Supply
Boost Switch
Buck Switch
Diagnosis
Wake-up
Supply
Pin2
Pin1
Connection 2 to the buck converter compensation network
Connection 1 to the buck converter compensation network
AC coupled energy reserve diagnostic input
Ground return of the buck converter, buck switch ground
Buck switch driver output to connect buck inductor
Boost voltage input for boost loop feedback and source of buck converter,
same voltage as boost output
Storage driver output to control the energy reserve capacitor charging
Ground return of the boost converter, buck switch ground
Boost switch driver output to connect boost inductor
Energy reserve voltage input for the storage capacitor charge control and
energy reserve monitor
Wake-up signal input to start-up boost and buck converters
Battery voltage power supply input
Satellite sensor sync voltage supply charge/discharge connection
Charge pump capacitor pin2
Charge pump capacitor pin1
Charge pump ground
Redundant buck converter input to supply current for charge pump
Buck converter input for buck loop feedback and current source of charge
pump
Definition
page
PIN CONNECTIONS
25.
33789
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