MC33989PEG Freescale Semiconductor, MC33989PEG Datasheet - Page 42

• Manufacturer Part Number: MC33989PEG
• Description: SBC-HS
• Manufacturer: Freescale Semiconductor

TYPICAL APPLICATIONS
SUPPLEMENTAL APPLICATION NOTES
V1 Regulator
V2 Regulator: Operation with External Ballast Transistor
stabilizing capacitors. The recommended value are: 22 μF esr < 5.0 ohms, and 47 μF esr < 10 ohms.
transistor selection: PNP or PMOS transistors can be used. A resistor between base and emitter (or source and drain) is
necessary to ensure proper operation and optimized performances. Recommended bipolar transistor is MJD32C.
V2 Regulator: Operation without Ballast Transistor
of the V1 regulator, then the ballast transistor can be omitted. The thermal aspects must be analyzed as well.
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33989
The V1 regulator is 5.0 V output, 2% accuracy with current capability of 200 mA max. It requires external decoupling and
stabilizing capacitors. The minimum recommended value are:
• C4: 100 nF
• C3: 10 μF < C3 < 22 μF, esr < 1.0 ohms. 22 μF < C3 < 47 μF, esr < 5.0 ohms. C3 > = 47 μF, esr < 10 ohms
The V2 regulator is a tracking regulator of the V1 output. Its accuracy relative to V1 is ±1%. It requires external decoupling and
The V2 pin has two functions: sense input for the V2 regulator and 5.0 V power supply input to the CAN interface. Ballast
The external ballast transistor is optional. If the application does not requires more than the maximum output current capability
The electrical connections are shown in
S0
CAN bus
Rp0
CL0
Rs0
C1
Figure 21. Device Typical Application Schematic
C1
Rt
C2
Figure
C2
Figure 22. V2 Regulator Operation
VSUP
R1
VSUP
CANH
HS1
L0
L1
L2
L3
CANL
no connect
Partial View
MC33989
V2CTRL
22.
V2CTRL
MC33989
Q1
GND
V2
V2
VDD1
MISO
MOSI
RST
VDD1
SCK
RST
WD
INT
CS
C5
TX
RX
C6
Safe circuitry
C3
C3
Auxiliary 5V
C4
C4
partial view
RST
RST
INT
SPI
CAN
MCU
GND
VDD
VDD
MCU
Analog Integrated Circuit Device Data
Components list:
C1: 22uF, C2: 100nF
C3: >10uF
C4: 100nF
Components list:
C1: 22uF, C2: 100nF
C3: >10uF
C4: 100nF
C5: >10uF
C6: 100nF
R1: 2.2k
Rt: 60 - 120
Rp0 to Rp3: 22k
Rs0 to Rs3: 22 k
CL0 to CL3: 10nF
Q1: MJD32C
Freescale Semiconductor