CAN Stamp
The CAN Stamp is a small single sided PCB Module that contains everything needed to setup an ArduPilot AP_Periph CAN node. Designed for low volume OEMs to solder onto their custom designed PCBs.
Last updated
The CAN Stamp is a small single sided PCB Module that contains everything needed to setup an ArduPilot AP_Periph CAN node. Designed for low volume OEMs to solder onto their custom designed PCBs.
Last updated
The stamp is based on the STM32L431 IC and contains a CAN Transceiver, Power Regulation and a 120 Ohm CAN termination resistor. Just give it 5v & CAN and you are away!
Features:
STM32L431
17.8x18.9mm
TJA1051
1 Amp 3.3v LDO
Input Fuse and Diode
120 ohm Termination Resistor
Fully compatible with Ardupilot and Px4 Firmware
The general stamp Architecture:
The stamp takes 5v in from the FC and regulates that down to 3.3v with an onboard 1 Amp LDO to power the L431.
Drone CAN specifies that all modules on the CAN Bus have their own input Diode and 1 Amp fuse. For ease of integration they are included on the stamp and are broken out to edge pads. This gives edge pads as follows:
5v In Pad (From FC)
Goes through fuse and diode
5v Out Pad (Fused for any 5v sensors)
Fused 5v goes to 3v3 LDO internally and powers L431
Fused 3.3v Out Pad (Fused for any 3v3 sensors)
The CAN Interface goes between the L431 and the main bus and converts the logic from the L431 into differential signalling using a CAN transceiver.
The L431 is connected to the Transceiver using pins PB8 & PB9 and exits the stamp using Edge Pad 8&9.
CAN Bus stipulates the the device on each end of the bus should have a 120 ohm termination resistor between CAN High & CAN Low. The stamp contains this resistor but by default it is NOT connected. To connect it please connect Stamp Edge Pad 10 with CAN Low (Edge Pad 9) on your PCB.
Some of the pins from the L431 are used on the stamp and are not broken out, these are:
PB8 - CANRx
PB9 - CANTx
PB3 - LED
Others are broken out but are preferred to be unused (SWD Programming Pins, also connected to the pads on the bottom of the PCB)
PA13 - SWDIO
PA14 - SWDCLK
The rest are available for use (if they are supported by ardupilot):
PC13
PC13
PC15
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
PA8
PA9
PA10
PA11
PA12
PA13 - SWDIO
PA14 - SWDIO CLK
PA15
PB0
PB1
PB2
PB3 LED
PB4
PB5
PB6
PB7
PB8 CAN
PB9 CAN
PB10
PB11
PB12
PB13
PB14
PB15
