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MM912F634CV2AP Datasheet(PDF) 61 Page - Freescale Semiconductor, Inc

Part # MM912F634CV2AP
Description  Integrated S12 Based Relay Driver with LIN
PDF  335 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MM912F634CV2AP Datasheet(HTML) 61 Page - Freescale Semiconductor, Inc

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Functional Description and Application Information
Power Supply
MM912F634
Freescale Semiconductor
61
Figure 18. Power Up / Down Sequence
To avoid any critical behavior, it is essential to have the MCU Power On Reset (POR) active when the analog die reset
(RESET_A) is not fully active. As the RESET_A circuity is supplied by VDDX, VDD needs to be below the POR threshold when
VDDX is to low to guarantee RESET_A active (3;6). This is achieved with the following implementation.
Power Up:
•
The VDD regulator is enabled after VDDX has reached the VLVRX threshold (1).
•
Once VDD reaches VLRV, the RESET_A is released (2).
Power Down:
•
Once VDDX has reached the VLVRX threshold (4), the VDD regulator is disabled and the regulator output is actively
pulled down to discharge any VDD capacitance (5). RESET_A is activated as well.
•
The active discharge guarantees VDD to be below POR level before VDDX discharges below critical level for the reset
circuity.
5V
VLBI / VLVI
Normal Operating
Range (not to scale)
VLVRX
VLVR
VPOR_A
RESET_A
VDDX
VDD
VSUP
VPOR_MCU
VROVX
VROX
MCU_POR
1
4
5
6
2
MCU_POR
3



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