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33905 Datasheet(PDF) 83 Page - Freescale Semiconductor, Inc

Part # 33905
Description  System Basis Chip Gen2 with High Speed CAN and LIN Interface
PDF  91 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

33905 Datasheet(HTML) 83 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
Freescale Semiconductor
83
33904/5
TYPICAL APPLICATIONS
The following figure illustrates the application case
where 2 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.
Figure 39. Application Options
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 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
5V/3.3 V
5 V/3.3 V
delivered by internal path transistor.



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