THEMIS
THEMIS User Manual - Rev. First Edition: 1.0 - Last Edition: 2.2 - Author: A.R. - Reviewed by S.R. -Copyright © 2022 SECO S.p.A.
39
M41_I2C0_SCL: M41 core
’
s I2C Bus clock line. Bidirectional signal, electrical level +3.3V_RUN
with a 2k2
Ω
pull-up resistor.
GPIO_[0÷1]: General purpose IO #0 and #1, electrical level +3.3V_RUN
Third expansion connector is CN51, a 12-pin single line SMT connector, type MOLEX 53398-1271
or equivalent, with pinout shown in the table on the left. Mating connector: MOLEX 51021-1200
receptacle with MOLEX 50079-8000 female crimp terminals.
This connector carries out processor
’
s SPI interface #3, four GPIOs and processor
’
s UART #0 interface at TTL level.
SPI3_CS0: SPI chip select, output signal, active high, electrical level +3.3V_RUN.
SPI3_SDI: SPI Master Input Slave Output, input signal, electrical level +3.3V_RUN.
SPI3_SDO: SPI Master Output Slave Input, ouput signal, electrical level +3.3V_RUN.
SPI3_SCK: SPI Serial Clock, electrical level +3.3V_RUN
GPIO_[2÷5]: General purpose IO
’
s, electrical level +3.3V_RUN
SCU_UART0_TX: Serial Port#0 Transmit data (TTL level)
SCU_UART0_RX: Serial Port#0 Receive data (TTL level)
A/D Header
NXP i.MX8 Processor includes to 12-bit Quad-channel Analog-to-Digital Converter (ADCs), which can
be used, on THEMIS board, to manage up to 4 analog inputs.
The A/D converter interface is accessible through a 7-pin 1.25mm pitch connector, type MOLEX
53398-0771 or equivalent, with the pinout shown in the table on the left.
Mating connector: MOLEX 51021-0700 receptacle with MOLEX 50079-8000 female crimp terminals.
ADC_[0÷3]: Analog Inputs, voltage range from -12V to +12V.
Expansion Connector #3 CN51
Pin Signal
1
+3.3V_RUN
2
GND
3
SPI3_SCK
4
SPI3_SDO
5
SPI3_SDI
6
SPI3_CS0
7
GPIO_2
8
GPIO_3
9
GPIO_4
10
GPIO_5
11
SCU_UART0_TX
12
SCU_UART0_RX
A/D Header CN45
Pin Signal
1
+3.3V_RUN
2
ADC_0
3
ADC_1
4
GND
5
ADC_2
6
ADC_3
7
GND
