mm912f634 Freescale Semiconductor, Inc, mm912f634 Datasheet - Page 55

• Manufacturer Part Number: mm912f634
• Description: Mm912f634 - Integrated S12 Based Relay Driver With Lin
• Manufacturer: Freescale Semiconductor, Inc

Functional Description and Application Information
4.3
The MM912F634 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 MM912F634 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
4.3.1
For the device power (VS1) below V
MM912F634 analog die will enter Reset mode with the condition “Power On Reset - POR”.
4.3.2
The MM912F634 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).
Freescale Semiconductor
DD
= V
DDX
describes how transitions are done between the different operating modes.
Modes of Operation
= 0 V).
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 MM912F634 analog die is virtually in Power Down mode. Once VS1>V
Stop
Command
(POR = 1)
Power Up
Stop
WDTO
to enable Window WD
1
,
Normal
Power
Down
Reset
Mode
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
)
MM912F634
POR
, the
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