SUPPLEMENTAL APPLICATION NOTES Figure 21. Device T" />
參數(shù)資料
型號: MC33989DWR2
廠商: Freescale Semiconductor
文件頁數(shù): 39/72頁
文件大?。?/td> 0K
描述: IC SYSTEM BASE W/CAN 28-SOIC
標準包裝: 1
控制器類型: 系統(tǒng)基礎芯片
接口: CAN
電源電壓: 5.5 V ~ 18 V
電流 - 電源: 45mA
工作溫度: -40°C ~ 125°C
安裝類型: 表面貼裝
封裝/外殼: 28-SOIC(0.295",7.50mm 寬)
供應商設備封裝: 28-SOIC W
包裝: 剪切帶 (CT)
配用: KIT33989DWEVB-ND - KIT EVAL 33989DW HS SBC
其它名稱: MC33989DWR2CT
Analog Integrated Circuit Device Data
44
Freescale Semiconductor
33989
TYPICAL APPLICATIONS
SUPPLEMENTAL APPLICATION NOTES
Figure 21. Device Typical Application Schematic
V1 Regulator
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
F < C3 < 22 F, esr < 1.0 ohms. 22 F < C3 < 47 F, esr < 5.0 ohms. C3 > = 47 F, esr < 10 ohms
V2 Regulator: Operation with External Ballast Transistor
The V2 regulator is a tracking regulator of the V1 output. Its accuracy relative to V1 is ±1%. It requires external decoupling and
stabilizing capacitors. The recommended value are: 22
F esr < 5.0 ohms, and 47 F esr < 10 ohms.
The V2 pin has two functions: sense input for the V2 regulator and 5.0 V power supply input to the CAN interface. Ballast
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
The external ballast transistor is optional. If the application does not requires more than the maximum output current capability
of the V1 regulator, then the ballast transistor can be omitted. The thermal aspects must be analyzed as well.
The electrical connections are shown in Figure 22.
Figure 22. V2 Regulator Operation
VDD1
VSUP
V2CTRL
RST
INT
CS
MISO
MOSI
SCK
TX
RX
CANH
CANL
HS1
L0
L3
C3
C4
C5
C6
C1
C2
Rt
GND
CAN
SPI
VDD
RST
Auxiliary 5V
CAN bus
WD
MCU
Safe circuitry
V2
L2
L1
Rp0
S0
Rs0
CL0
Q1
R1
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
MC33989
INT
VDD1
VSUP
V2CTRL
RST
C3
C4
C1
C2
VDD
V2
no connect
Components list:
C1: 22uF, C2: 100nF
C3: >10uF
C4: 100nF
MCU
partial view
MC33989
Partial View
RST
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