Table 4-6. Mechanical Buttons
SAM HA1 Pin
Silkscreen Text
RESET
RESET
PB03
SW0
4.2.2.
LED
There is one yellow LED available on the SAM HA1G16A Xplained Pro board that can be turned on and
off. The LED can be activated by driving the connected I/O line to GND.
Table 4-7. LED Connection
SAM HA1 Pin
Function
Comment
PA00
Yellow LED0
Pin shares function with
EXT1
4.2.3.
LIN SBC
The LIN SBC inside the SAM HA1 has external connections to headers and the microcontroller inside the
SAM HA1. The LIN-SBC can be switched into different modes using the EN-Pin. The EN-Pin can be
connected to a microcontroller portpin or fixed to VCC.
Table 4-8. EN SEL Header
Mode
Setting
Comment
Determined by
Microcontroller
PB22 - SBC_EN
PB22 controls the mode of the SBC. During startup SBC
stays in failsafe due to PB22 being in tri-state and EN pin
having a pull-down resistor.
Always normal
mode
VCC - SBC_EN
SBC goes into normal mode after startup. Mode can't be
controlled by the microcontroller
Always fail-safe
Open
The internal pull-down resistor keeps the SBC in fail-safe
mode. Useful when no LIN-communication is needed but the
SBC is used to supply the board
Table 4-9. LIN-Transceiver connections
Microcontroller
Pin
LIN-TRX Pin
MUX Setting
PB30
TXD
SERCOM[5]-PAD[0], MUX: D
PB23
RXD
SERCOM[5]-PAD[3], MUX: D
Table 4-10. RES SEL Header
Header Pin
SAM HA1 Pin
Comment
1 [NRES]
LIN-SBC NRES
output
Connect to enable resetting of the microcontroller by the LIN
SBC. Possible sources are VS undervoltage and others,
listed in the ATSAMHA1G16A datasheet.
2 [RESETN]
Microcontroller
Reset Input
Atmel SAM HA1G16A Xplained Pro [USER GUIDE]
Atmel-9426A-SAM-HA1G16A-Xplained-Pro_User Guide-10/2016
15
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