MM912H634CV1AE Freescale Semiconductor, MM912H634CV1AE Datasheet - Page 57

• Manufacturer Part Number: MM912H634CV1AE
• Description: 64KS12 LIN2xLS/HS Isense
• Manufacturer: Freescale Semiconductor
• Series: -r

Specifications of MM912H634CV1AE

• Applications: Automotive
• Core Processor: HCS12
• Program Memory Type: FLASH (64 kB)
• Controller Series: HCS12
• Ram Size: 6K x 8
• Interface: LIN
• Number Of I /o: -
• Voltage - Supply: 5.5 V ~ 27 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP Exposed Pad
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

4.4
The MM912_634 analog die offers three main operating modes: Normal (Run), Stop, and Sleep. In Normal mode,
the device is active and is operating under normal application conditions. In Stop mode, the voltage regulator
operates with limited current capability, the external load is expected to be reduced while in Stop mode. In Sleep
mode both voltage regulators are turned off (V
Wake-up from Stop mode is indicated by an interrupt signal. Wake-up from Sleep mode will change the MM912_634 analog die
into reset mode while the voltage regulator is turned back on.
The selection of the different modes is controlled by the Mode Control Register (MCR).
Figure 16
4.4.1
For the device power (VS1) below V
MM912_634 analog die will enter Reset mode with the condition “Power On Reset - POR”.
4.4.2
The MM912_634 analog die enters Reset mode if a reset condition occurs (POR - Power On Reset, LVR- Low Voltage Reset,
Low Voltage VDDX Reset - LVRX, WDR - Watchdog Reset, EXR - External Reset, and WUR - Wake-up Sleep Reset).
For internal reset sources, the RESET_A pin is driven low for tRST after the reset condition is gone. After this delay, the RESET_A
pin is released. With a high detected on the RESET_A pin, VDD>VLVR and VDDX>VLVRX the MM912_634 analog die enters
in Normal mode.
To avoid short-circuit conditions being present for a long time, a tVTO timeout is implemented. Once VDD < VLVR or VDDX <
VLVRX with VS1 > (VLVI + VLVI_H) for more than tVTO, the MM912_634 analog die will transit directly to Sleep mode.
Freescale Semiconductor
describes how transitions are done between the different operating modes.
Modes of Operation
Power Down Mode
Reset Mode
Internal Reset
External or
1)
Initial WD to be served within t
External or Internal Reset
Wake Up
WatchDog Time-Out
POR
Figure 16. Modes of Operation and Transitions
Mode
, the MM912_634 analog die is virtually in Power Down mode. Once VS1>VPOR, the
Stop
Command
(POR = 1)
Power Up
Stop
MM912_634 Advance Information, Rev. 4.0
DD
WDTO
= V
to enable Window WD
1
,
DDX
Normal
Power
Down
Reset
Mode
= 0 V).
V
Delay (t
DD
Power Down
(V
High and Reset
SUP
Command
Sleep
<V
RST
Sleep
Mode
POR
) expired
)
and Delay (t
V
DD
Low and VSUV = 0
VTO
) expired
Wake Up
Power Down
(V
SUP
<V
Modes of Operation
POR
)
MCU
ANALOG
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