MM912F634DV1AER2 Freescale Semiconductor, MM912F634DV1AER2 Datasheet - Page 63
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MM912F634DV1AER2
Manufacturer Part Number
MM912F634DV1AER2
Description
16-bit Microcontrollers - MCU DUAL LS/HS SWITCH W. LIN
Manufacturer
Freescale Semiconductor
Datasheet
1.MM912G634DV1AE.pdf
(338 pages)
Specifications of MM912F634DV1AER2
Rohs
yes
Core
HCS12
Processor Series
MM912F634
Data Bus Width
16 bit
Maximum Clock Frequency
20 MHz
Program Memory Size
32 KB
Data Ram Size
2 KB
On-chip Adc
Yes
Operating Supply Voltage
4.5 V to 5.5 V
Operating Temperature Range
- 40 C to + 105 C
Package / Case
LQFP-48
Mounting Style
SMD/SMT
A/d Bit Size
10 bit
A/d Channels Available
15
Interface Type
SPI
Maximum Operating Temperature
+ 105 C
Minimum Operating Temperature
- 40 C
Number Of Programmable I/os
6
Number Of Timers
1
Program Memory Type
Flash
Supply Voltage - Max
4.5 V
Supply Voltage - Min
4.5 V
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Functional Description and Application Information
4.4.3
To guarantee safe power up and down behavior, special dependencies are implemented to prevent unwanted MCU execution.
Figure 19
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:
Power Down:
Freescale Semiconductor
•
•
•
•
•
The VDD regulator is enabled after VDDX has reached the V
Once VDD reaches V
The MCU is also protected by the MCU_LVR.
Once VDDX has reached the V
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.
shows a standard power up and power down sequence.
Range (not to scale)
Power Up Behavior / Power Down Behavior - I64
V
Normal Operating
LVRX
The behavior explained is essential for the MC9S12I64 MCU die used, as this MCU does
have an internal regulator stage, but the LVR function is only active in normal mode
MC9S12I64.
The shutdown behavior should be considered when sizing the external capacitors C
C
VDDX
RESET_A
/ V
V
V
LBI
POR_MCU
LVR_MCU
for extended low voltage operation.
V
V
/ V
POR_A
V
V
ROVX
ROX
5V
LVR
LVI
LRV
, the RESET_A is released (2).
3
LVRX
VSUP
Figure 19. Power Up / Down Sequence
threshold (4), the VDD regulator is disabled and the regulator output is actively
1
2
NOTE
VDDX
LVRX
threshold (1).
VDD
4
5
6
VDD
and
Power Supply
MM912F634
63
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