C030-R412M - User Guide
UBX-19010121 - R01
Hardware description
Page 16 of 27
Name Function
Variant
2
R412M
Description
R132 InterfaceMCU level translator OE to
3.3VDC
Links OE input of the level translator to 3.3VDC
R133 HostMCU USART2 virtual COM Rx link
Link to InterfaceMCU USART2 Rx signal through 1.8V to 3.3V
level translator
R134 HostMCU USART2 virtual COM Tx link
Link to InterfaceMCU USART2 Tx signal through 1.8V to 3.3V
level translator
R135 HostMCU external system clock (Osc.)
link
Link to 8 MHz clock generated from InterfaceMCU to drive the
HostMCU
R136 HostMCU USART2 USB sniffer Tx link
Link to serial USB sniffer Rx input
R137 HostMCU USART2 USB sniffer Rx link
Link to serial USB sniffer Tx output
R142 InterfaceMCU 3.3VDC supply sampling
Utilised for monitoring InterfaceMCU 3.3VDC supply level
R143 InterfaceMCU level translator OE GND
link
Links OE input of the level translator to GND to disable the
translator
R144 HostMCU PA_0 pull up
HostMCU PA_0-WKUP pin setting
R145 HostMCU BOOT1 pull up
HostMCU BOOT1 input setting to ‘1’
R146 HostMCU BOOT0 pull up
HostMCU BOOT0 input setting to ‘1’
R147 Serial USB sniffer reset link
Link between serial USB sniffer’s reset input to the application
section reset signal
R149 Cellular Module DTR pull down
SARA-R412M DTR input pull down
R150 The Si7034-A10 is a Temperature and
Relative Humidity Sensor power link
Link to 1.8VDC supply rail. See R48 link for utilization.
R151 Arduino™ interface 1.8V IO supply option
Provisional
R152 Arduino™ interface IOREF voltage level
selection for 3.3VDC
Link to Arduino™ interface 3.3V pin
R153 Arduino™ interface IOREF voltage level
selection for 5VDC
Link to Arduino™ interface 5V pin
R154 Arduino™ interface 5V pin to USB5V rail
USB5V supply link for Arduino™ interface
R160 M_GPIO3 net to PB8 link
Link to Arduino™ interface
R161 M_GPIO4 net to PB15 link
Link to Arduino™ interface
R162 GPS_PPS net to cellular module GPIO1
link
Link to SARA-R412M GPIO1
R164 IC22 output link to GNSS module
Provisional
R165 1V8_ZOE supply link to GNSS module
1.8V Supply rail to ZOE-M8B
R167 IC22 100k resistor
Provisional
R168 M_GPIO3 net link to cellular module
Link to SARA-R412M GPIO3
R170 M_VINT net link to cellular module GPIO5
Link to SARA-R412M GPIO5
R171 Arduino™ interface D5 pin to IC10 link
Provisional isolation
R172 IC10 A6 pin to PA5 link
Provisional isolation
R173 PA5 to Arduino™ interface D5 pin direct
link
Provisional
R174 USART1_TX net USB sniffer link
Link to S2 switch
R175 I_GNSS signal connection to Arduino™
interface A1
Provisional
R178 PC8 link to Arduino™ interface D4
Link to Arduino™ interface
R179 PB1 connection to Arduino™ interface D4
Provisional for backward compatibility
R180 Cellular module M_SCL net to Arduino™
interface SCL pin
Provisional
R181 Cellular module M_SDA net to Arduino™
interface SDA pin
Provisional
