Part II General Information
Product Principle 134
2.10.4.2 Key and Indicator Board
The key and indicator board is used to indicate the battery level and control the fan of the battery
package.
2.10.4.3 Battery Magnetic Connection Board
The battery magnetic connection board connects to the magnetic interface of the main unit to
power the main unit.
2.10.5 System Power-up Control
Figure 2-14 System power-up control
PC module
Power on/off
control
circuit
Control
panel
S3# S4#
POWER
_OK
Power
button
DC-DC
5VSTB
12V
Pow-en
3V3_STB
Function
circuit
Multi
power
sources
The following table describes related control signals.
No. Control Signal Description Remarks
PWR_BTN_N
PWR_BTN#
Pulse signal generated by the power button on the
control panel. It is transmitted to the CPU board
through the power management FPGA to trigger the
startup process.
S3# Output signal of the CPU board. A valid signal
indicates that the CPU system is in the standby state
(S4# is a high level). This signal enables 5VSTB to be
in the power-up state in standby mode through the
power management FPGA.
S4# Output signal of the CPU board. A valid signal
indicates that the CPU system is in the dormancy
state.
S5# This signal is not used currently.
PWR_OK# Signal sent by the power management FPGA to the
CPU board to indicate that 12 V power has been
connected.
The system can be started regardless of whether being powered by the main unit or battery.
The power supply generates 5VSTB and 3.3VSTB only if there is AC input.
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