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33903 Datasheet(PDF) 96 Page - Freescale Semiconductor, Inc

Part # 33903
Description  SBC Gen2 with CAN High Speed and LIN Interface
PDF  104 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

33903 Datasheet(HTML) 96 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
96
Freescale Semiconductor
33903/4/5
TYPICAL APPLICATIONS
The following figure illustrates the application case
where two reverse battery diodes can be used for
optimization of the filtering and buffering capacitor at the
VDD pin. This allows using a minimum value capacitor at
the VDD pin to guarantee reset-free operation of the MCU
during the cranking pulse and temporary (50 ms) loss of the
VBAT supply.
Applications without an external ballast on VDD and
without using the VAUX regulator are illustrated as well.
ex2: Split VSUP Supply
ex 4: No External Transistor - No VAUX
ex 3: No External Transistor, VDD ~100 mA Capability
ex1: Single VSUP Supply
Optimized solution for cranking pulses.
C1 is sized for MCU power supply buffer only.
VDD
VSUP2
VE
VB
VBAT
Q1
D1
VBAUX
VAUX
5.0 V/3.3 V
VSUP1
Q2
Partial View
VDD
VE
VB
VBAT
D1
VBAUX
VDD
VE
VB
VBAT
D1
VDD
VE
VB
VBAT
Q1
D2
VSUP2
VSUP1
VSUP2
VSUP1
VSUP2
VSUP1
D1
C1
C2
VCAUX
Q2
VAUX
VCAUX
Q2
VBAUX
VAUX
VCAUX
VBAUX
VAUX
VCAUX
Partial View
Partial View
Partial View
5.0 V/3.3 V
5.0 V/3.3 V
delivered by internal path transistor.
Figure 50. Application Options



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