Data Sheet

Thundercomm Turbox
TM
SOM Datasheet
- 16 -
2. Power supply interface
Dedicated PMIC (Power Management Integrated Circuit) continuously monitors events that might trigger a power-on
sequence. If an event occurs, these circuits will power on the IC (Integrated Circuit), check and enable power sources
for the device.
Two methods to power on your device:
 Press the power-on key to power on the device, and wait for 3s to boot up the system.
 When using CBL_PWR_N pin to connect to ground, SOM will power on automatically with the battery or power
supply installed.
Figure 3-2. Power on signal
Table 3-1. Pin list for power on interface
PIN Name
PIN
Voltage
Type
Description
Notes
KYPD_PWR_N1
193
pulled up internally through
a 200K resistor to 1.8V
DI
Power on/off key signal
Low level active
CBL_PWR_N
216
pulled up internally through
a 200K resistor to 1.8V
DI
Signal use for auto
power on when you
plug in a battery, active
low, internal pull up
3. Reset interface
Hold the volume button will initiate a shutdown or reset (software selectable).
Stage 1. reset – software-configurable bark
PMIC generates interrupt, giving the soc device the opportunity to fix the problem or gracefully reset the system.
Example events that can cause a bark: Over temperature indicates system is getting too hot. PMIC watchdog
indicates that it has not kicked.
Stage 2. –software-configurable bite
If reset is ignored, PMIC will force a reset event (selectable by software).
Stage 3 –hardware mandatory bite
The user can generate a mandatory reset by a long key press of PM_RESIN_N, or KYPD_PWR_N1, or PM_RESIN_N
+ KYPD_PWR_N1.
The standalone or combination of reset triggers can also be selected as SBL by directly writing to the appropriate
registers