Difference between revisions of "Chimera/v1.00"

Revision as of 03:36, 5 March 2017

Overview

STMicro STM32F767VIT6 Micro Controller Unit
- ARM Cortex-M7 / 216 MHz CPU
- FPU & DSP instructions
- 2 Mbytes Flash, 512 Kbytes SRAM
- General-purpose DMA
- 3×12-bit, 2.4 MSPS ADC
- 28 communication interfaces (USART,SPI, I2C, CAN, SDIO, USB,...)
- 18 timers, RTC
Invensense MPU-9250 9 DOF Inertial Measurement Unit
Intersema MS5611 Barometer
Measurement Specialties MS4525DO Pressure Sensor for Pitot tube
microSD card (SDIO bus) + dedicated power supply (MCU+SD card) emergency files closing system
All connectors available both in standard 0.1” header and Molex Picoblade (except servos and R/C receiver, 0.1” header only)
Dedicated serial link and power supply for "Companion Board" (Beaglebone, Raspberry, Gumstix, ...)
x1 powerswitch 5v supply on AUX A (AUX0 to 3) header
x4 status Leds + 8 segments LED display
SWD debug connector (STM STLink compliant header)
x8 Servos 0.1” header
Servos Power supply selection capabilities (Chimera onboard power supply or external source)
x2 RC Receiver inputs'
- x1 S.BUS, PPM & Spektrum Satellite compatible (including receiver binding)
- x1 S.BUS & Spektrum Satellite compatible (including receiver binding)
x5 UARTs
- x1 free with hardware flow control signals
- x1 for GPS receiver
- x1 (free if no) modem XBEE
- x1 (free if no) “Companion” board
- x1 free on AUX B connector
x1 I2C external bus
- 3.3V logic level with 2x2 connectors
- 5V logic Level
x1 SPI bus with Slave Select (Master or Slave)
x1 CAN bus
x8 auxiliary Inputs/Outputs spread over 2 connectors (AUX A & AUX B):
- x6 ADC
- x6 Timers (different from servos Timers)
- x1 UART
- x1 DAC
VBat + Gnd connectors for peripheral
XBEE modem holder
- Xbee’s ASSO and Reset connected to MCU GPIOs
micro-USB plug (+ Picoblade & 0.1” header in //)
- Board can be flashed even if aircraft battery is off
Twin switching power supply TPS55386 :
- source 2 to 6 Lipo cells (6 to 26v)
- x1 5v/3A for “Companion” board (controlled by GPIO)
- x1 5v/3A dedicated to Chimera (servos and other 5v peripherals)
Test points for internal I2C1 bus (IMU) and IMU slave bus (Barometer and Pitot tube pressure sensor)
89x60mm (3.5x2.4")

Hardware Revision History

Version #	Release Date	Release Notes
v1.00	10/2016	Initial release of Chimera

Detailed Features

Pictures

Pinout

Pins Name and Type are specified with respect to the Autopilot Board

General Pinout

**UART1 (Companion)**
Pin #	Name	Type	MCU Port	Description
1	GND	PWR	-	common ground
2	+5V Comp.	PWR	Controlled by PC5	5V/3A specific for Companion board (PC5 = LOW => ON (default, pulldown) / PC5 = High => OFF)
3	+3.3V	PWR	-	3.3V Rail from autopilot
4	RX1	IN	PB7	UART1 Serial Input (3.3V level, 5V tolerant)
5	TX1	OUT	PB6	UART1 Serial Output (3.3V level)

**UART2**
Pin #	Name	Type	MCU Port	Description
1	GND	PWR	-	common ground
2	+5V	PWR	-	5V Rail from autopilot
3	+3.3V	PWR	-	3.3V Rail from autopilot
4	RX2	IN	PD6	UART2 Serial Input (3.3V level, 5V tolerant)
5	TX2	OUT	PD5	UART2 Serial Output (3.3V level)
6	RTS2	OUT	PD4	UART2 Flow Control Request to Send (3.3V level)
7	CTS2	IN	PD3	UART2 Flow Control Clear to Send (3.3V level, 5V tolerant)

**UART3 (Modem)**
Pin #	Name	Type	MCU Port	Description
1	GND	PWR	-	common ground
2	+5V	PWR	-	5V Rail from autopilot
3	+3.3V	PWR	-	3.3V Rail from autopilot
4	RX3	IN	PD9	UART3 Serial Input (3.3V level, 5V tolerant) DO NOT USE if XBee module present on Chimera
5	TX3	OUT	PD8	UART3 Serial Output (3.3V level) DO NOT USE if XBee module present on Chimera

**UART8 (GPS Receiver)**
Pin #	Name	Type	MCU Port	Description
1	GND	PWR	-	common ground
2	+5V	PWR	-	5V Rail from autopilot
3	+3.3V	PWR	-	3.3V Rail from autopilot
4	RX8	IN	PE0	UART8 Serial Input (3.3V level, 5V tolerant)
5	TX8	OUT	PE1	UART8 Serial Output (3.3V level)

**I2C2 (3V3)**
Pin #	Name	Type	MCU Port	Description
1	GND	PWR	-	common ground
2	+5V	PWR	-	5V Rail from autopilot
3	+3.3V	PWR	-	3.3V Rail from autopilot
4	SDA2	Open Drain I/O	PB11	I2C2 bus Serial DAta (3.3V level, 1.5k pull-up)
5	SCL2	Open Drain I/O	PB10	I2C12 bus Serial CLock (3.3V level, 1.5k pull-up)

Note: 2 x Molex Picoblade and 2 x 0.1" Header are all in parallel

**I2C2 (5V)**
Pin #	Name	Type	MCU Port	Description
1	GND	PWR	-	common ground
2	+5V	PWR	-	5V Rail from autopilot
3	+3.3V	PWR	-	3.3V Rail from autopilot
4	SDA2	Open Drain I/O	PB11	I2C2 bus Serial DAta (5V level, 3.3k pull-up)
5	SCL2	Open Drain I/O	PB10	I2C12 bus Serial CLock (5V level, 3.3k pull-up)

**SPI1**
Pin #	Name	Type	MCU Port	Description
1	GND	PWR	-	common ground
2	+5V	PWR	-	5V Rail from autopilot
3	+3.3V	PWR	-	3.3V Rail from autopilot
4	NSS1	OUT	PA15	Slave Select. Selects the SPI slave
5	MOSI1	I/O	PB5	SPI1 Master Out Slave In. Data output from master / data input to slave
6	MISO1	I/O	PB4	SPI1 Master In Slave Out. Data input to master / data output from slave
7	SCK1	I/O	PB3	SPI1 Serial clock. Clock output from master or input to slave

**AUX A**
Pin #	Name	Type	MCU Port	Description
1	GND	PWR	-	common ground
2	+5V Aux	PWR	Controlled by PC4	5V from autopilot through Power Switch (PC4 = LOW => OFF / PC4 = High => ON)
3	+3.3V	PWR	-	3.3V Rail from autopilot
4	AUX0	I/O	PA5	General Purpose I/O / ADC1+2 in5 / DAC2 / TIM2 ch1
5	AUX1	I/O	PA3	General Purpose I/O / ADC1+2+3 in3 / TIM2 ch4 / TIM5 ch4 / TIM9 ch2
6	AUX2	I/O	PA2	General Purpose I/O / ADC1+2+3 in2 / TIM2 ch3 / TIM5 ch3 / TIM9 ch1
7	AUX3	I/O	PA0	General Purpose I/O / ADC1+2+3 in0 / TIM2 ch1 / TIM5 ch1

**AUX B**
Pin #	Name	Type	MCU Port	Description
1	GND	PWR	-	common ground
2	+5V	PWR	-	5V Rail from autopilot
3	+3.3V	PWR	-	3.3V Rail from autopilot
4	AUX4	I/O	PC3	General Purpose I/O / ADC1+2+3 in13
5	AUX5	I/O	PC2	General Purpose I/O / ADC1+2+3 in12
6	AUX6	I/O	PC6	General Purpose I/O / TIM3 ch1 / TIM8 ch1 / UART6 Tx
7	AUX7	I/O	PC7	General Purpose I/O / TIM3 ch2 / TIM8 ch2 / UART6 Rx

**CAN**
Pin #	Name	Type	MCU Port	Description
1	GND	PWR	-	common ground
2	+5V	PWR	-	5V Rail from autopilot
3	CANH	I/O	-	CAN bidirectional + line
4	CANL	I/O	-	CAN bidirectional - line

Note: Embedded 120R terminator resistor.

**USB**
Pin #	Name	Type	MCU Port	Description
1	GND	PWR	-	common ground
2	USB+	I/O	PA12	USB bidirectional D+ line
3	USB-	I/O	PA11	USB bidirectional D- line
4	VBUS	IN	PA9	Indicates the presence of USB bus power (5V level), DFU or USB storage Mode selection (BOOT0 MCU pin)

Note: MicroUSB, Molex Picoblade and 0.1" Header USB connectors are in parallel, only one can be connected at a time.

**SWD (Serial Wire debug)**
Pin #	Name	Type	MCU Port	Description
1	+3.3V	PWR	-	3.3V Rail from autopilot
2	SWCLK	IN	PA14	SWD Serial Clock
3	GND	PWR	-	common ground
4	SWDIO	I/O	PA13	SWD Serial Data
5	RST	IN	NRST	MCU Reset
6	NC	-	-	Not connected, for STM ST-LINK/V2 connector compliance

Note: Pin to pin compatible with STM ST-LINK/V2 debug tool connector

**Power Out**
Pin #	Name	Type	Description
1	GND	PWR	common ground use only to power peripheral modules, DO NOT use as power supply input for autopilot
2	VBAT	PWR	+ Rail from battery use only to power peripheral modules, DO NOT use as power supply input for autopilot

R/C Receivers and Servos header pinout

**RC Receiver 1**
Pin #	Name	Type	MCU Port	Description
1	GND	PWR	-	common ground
2	+5V	PWR	-	5V Rail from autopilot
3	RC1	I/O	PA1	Serial (SBUS, Spektrum, etc.) or PPM Stream RC receiver signal (5V Tolerant) UART4 Rx / TIM2 ch2 / TIM5 ch2

**RC Receiver 2**
Pin #	Name	Type	MCU Port	Description
1	GND	PWR	-	common ground
2	+5V	PWR	-	5V Rail from autopilot
3	RC1	IN	PE7	Serial (SBUS, Spektrum, etc.) RC receiver signal (5V Tolerant) UART7 Rx

**Servo 0/1/2/3/4/5/6/7**
Pin #	Name	Type	MCU Port	Description
1	GND	PWR	-	common ground
2	+5V Servo	PWR	-	5V Rail for Servos
3	SRV0 SRV1 SRV2 SRV3 SRV4 SRV5 SRV6 SRV7	OUT	PA6 PA7 PB0 PB1 PD12 PD13 PD14 PD15	Servo signal (PWM)

Servo Power options

There is two options to supply connected servos.
Note : Whatever option is chosen, autopilot's ground already connected to servomotor's ground.

Powering Servos with Autopilot

This option can be used provided total current from 5V rail (autopilot + external 5V modules + servos) does not exceed 3A.
In this case, 5V servo rail must be connected to autopilot 5V rail as described below.

Warning: make sure shunt current rating exceed servos total consumption
A practical way of making this connection is to use a 2 or 3 way shunt like Samtec's MNT-103-BK-G (3.9A/pin)

Powering Servos using an external BEC/Power Source

This option must be used if total current from 5V rail may exceed 3A or for other special servo configuration.

Schematic

PCB

Gerber & Drill Files

Assembly

Components Layout

Bill Of Material

Download Chimera v1.00 Bill of Material (zipped LibreOffice Calc & PDF file)

PCB and assembled boards suppliers

Check availability on Get Hardware page

Mechanical Dimensions

Programming

On-board Data Logging

Debugging

Debugging with STM Discovery ST-LINK/V2 embedded debug tool

Debugging with CricketProbe

Debugging with Black Magic Probe

Source Files

Source code

Where to Buy