Configuration
—Daughter Cards
MPC5777C EVB User Guide, Rev. 0
22
Freescale
4.1.3
Daughter Card Standalone Power Input –Power SBC
Daughter Card has been designed to have onboard Power System Basis Chip (SBC),
MC33908LAE
.
This chip adds following options in the card,
•
SMPS Pre-regulators
•
Linear Regulators
•
SPI Interface
•
Fail Safe Output
•
RESET output to MCU (RSTB)
•
Interrupt Pulses to MCU (INTB)
•
High Speed CAN Transceiver
•
LIN Transceiver
•
Debug Mode
Power Switch SW1 should be in ON position to use Daughter card in standalone mode which enables
the use Power SBC supplies to MCU power domain.
The connection of any power domain and interfaces to Power SBC has to be enabled by respective
jumper as described in
Table 10.
Table 10: MCU power selection jumpers with PowerSBC
Jumper
Description
Jumper Setting
J1
3.3V Selection
1-2: 3.3V from onboard Power SBC to MCU
J2
5V Selection
1-2: 5V from onboard Power SBC to MCU
J5
ADC Analog Supply
Selection
2-3: Select 5V from Switching Regulator
J21
VDD Core Supply
Selection
7-8: 1.25V from onboard Power SBC to MCU
J504 & J505
PowerSBC VCCA selection
& Current Driving Capability
J504: 2-3, J505:1-2:
SBC_3V3 with External PNP Transistor (upto 300mA)
J504: 1-2, J505: Open:
SBC_3V3 with internal MOSFET (up to 100mA)
J511
MISO Buffer Supply
(SPI Bus level to connect
with MCU)
1-2: Select SBC 3.3V
2-3: Select SBC 5V*
J512
SBC Debug Mode
Open: Normal Operation
Short: Enters into Debug Mode at Start-up
J517
SPI Bus Selection from
SBC/ Mother Board
Connect Power SBC SPI to MCU:
1-2, 4-5, 7-8, 10-11, 13-14, 16-17
Connect MB SPI to MCU:
3-2, 6-5, 7-8, 12-11, 15-14
J523
SBC RESET & Interrupt
Signals
1-2: Connect SBC Interrupt to MCU
3-4: Connect SBC RESET Output to MCU