19
Board Layout
Chapter 3
Embedded and Industrial Computing
Select MCU Detect Function for power ignition
behavior (SW1)
:
The function of the above jumpers are further explained
here.
Power Good Detection
1.
: A power-good signal
from the main board will be sent to the ignition
controller so that the ignition controller can
decide or alter the power state upon the following
instances. (Refer to the
flow chart
in
Chapter 4
):
Power-on instance
•
Power-good signal turned-low instance
•
Low Voltage Detection
2.
: Turn on this switch to
enable the automatic detection of low voltage
state of the battery. It will automatically turn
off the system when low voltage state has been
detected (
Note
:
the low-voltage condition needs
to remain 30 seconds continually
). The voltage
level can be set in the
Ignition System Manager
(ISM) which is provided by Lanner as a sample
code for functions on the power ignition module.
The default setting of this function: Shutdown
Voltage in the ISM is disabled.
(Refer to the
flow
chart
in
Chapter 4
and the
Using the Ignition
System Manager (ISM)
in
Appendix A
.)
Watchdog:
3.
Enable this switch to enable shutdown
after watchdog timer count-down to zero. This is a
programmable function. If there is no program to
control and monitor the watchdog timer, set this
jumper to disabled to avoid abnormal shutdown.
(Refer to the
flow chart
in
Chapter 4
)
MCU (Microcontroller) Function Selection (SW1, SW2)
:
It is for selecting the microcontroller’s function.
Select Connect MCU communication Port From
Internal or External (SW2
): Note the external port is the
CN4
connector (see below) on the board.
An external RS-232 connector for MCU programming
(CN4)
SW1
ON
1
2
3
4
SW2
ON
4 3 2 1
Jumper
Pin No.
Pin NO.
SW1
1-OFF, 2-OFF, 3-OFF, 4-ON
1-ON, 2-OFF, 3-OFF, 4-OFF
SW2
1-OFF, 2-OFF, 3-ON, 4-ON
1-ON, 2-ON, 3-OFF, 4-OFF
Function
Download Data
Normal (Default)
Switch 1
Pin No. Pin Name Pin No. Pin Name
1
P2_RT_1
5
GND
2
P3_S0_2
6
IGN3V3_SB
3
P3_S0_1
7
IGN3V3_SB
4
PIO0_1
8
IGN3V3_SB
ON
SW1
1
2
3
4
8
7
6
5
Switch 2
Pin No.
Pin Name
Pin No.
Pin Name
1
PIO1_6_RXD
5
NXP_TXD
2
PIO1_7_TXD
6
NXP_RXD
3
PIO1_6_RXD
7
COM5_RXD
4
PIO1_7_TXD
8
COM5_TXD
Pin No.
Pin Name
1,2 ON
Connection through internal COM port
(COM5)
3,4 ON
Connection through external COM port
(CN4)
ON
4 3 2 1
5 6 7 8
Pin No.
Pin Name
1
EXT_TXD
2
GND
3
EXT_RXD
3 2 1
Selector No.
SW1
Ignition Function
1
Power Good Detection
ON: Enable
OFF: Disable
2
Low Voltage Detection
3
Watchdog
4
Programming MCU
Reserved
The default value is ON for selector 1, OFF for se-
lector 2, Off for selector 3, and OFF for selector 4
