Toradex Verdin - Page 76

Verdin Carrier Board Design Guide
Preliminary – Subject to Change
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software and ramping down power rails on the module (including the PWR_1V8_MOCI). In this off-
state, the system can be turned on by pressing again the power button. A long pressing on the
power button (>5s) initiates an emergency power shutdown. All power rails will be turned off. The
module can be turned back on by using the power button. Without the power button, the module
can only be turned on after shutting it down in software and power cycling the main VCC rail after.
All the rest of the rest of the power management signals can be left unconnected.
3.4.2.2 System Power States
Figure 61: System Power States and Transitions
The sleep state is optional. Therefore, this state and its transitions are grayed out in the state
diagram. If the reset button (CTRL_RESET_MICO#) is not implemented in such a power scheme, it
is still possible to do software initiated reset cycles. Without implementing a power button
(CTRL_PWR_BTN_MICO#), the only option for exiting the module OFF state is to “unplug” the
system.
3.4.2.3 Reference Schematics
The reference schematics below show the minimum amount of external components that are
required for running the Verdin module.
Module OFF
PWR_EN_MOCI =0
SLEEP_MOCI# =0
RESET_MOCI# =0
FORCE_OFF_MOCI# =0
Running
PWR_EN_MOCI =1
SLEEP_MOCI# =1
RESET_MOCI# =1
FORCE_OFF_MOCI# =1
Sleep
PWR_EN_MOCI =1
SLEEP_MOCI# =0
RESET_MOCI# =1
FORCE_OFF_MOCI# =1
Reset
PWR_EN_MOCI =0**
SLEEP_MOCI# =0**
RESET_MOCI# =0
FORCE_OFF_MOCI# =1
Unplugged
PWR_EN_MOCI =0
SLEEP_MOCI# =0
RESET_MOCI# =x
FORCE_OFF_MOCI# =x
Add VCC
VCC > 3.135V
Unplug
VCC < 0.5V
Run to Reset
Software initiated Reset
or
RESET_MICO# = 0
Reset to Run
RESET_MICO# = 1
Run to Sleep
Software initiated Sleep
Sleep to Run
WAKE1_MICO# = 0
or
PWR_BTN_MICO# = 0 (<5s)
Force Off
PWR_BTN_MICO# = 0 (>5s)
Shutdown
Software initiated power down*
OFF to Run
PWR_BTN_MICO# = 0 (<5s)
From any State
* Can also be initiated by
PWR_BTN_MICO# = 0 (<5s)
** Depends on the Module
Unplug
VCC < 0.5V