HadCon 2

HadCon2 is a credit-card sized general purpose I/O module for detector and experiment controls as well as for small data acquisition systems.

It is the successor of the discontinued first version HadCon ( HADControl/HadShoPoMo general purpose board, HadCon @ Epics Wiki).

The module has an ATMEL AT90CAN128 microcontroller providing a multitude of connectivity:

While the discontinued precursor HadCon had an SoC on-board, its successor HadCon2 has broken up this concept in favour of a more open access:
It doesn't have any CPU on board, but a USB connector to directly allow communication with any type and size of computer (e.g. PC, raspberry PI, dreamplug, ...) having an USB port on one side and at the other end the microcontroller and the FGPA. This communication is based on an ASCII-based protocol in view of easy implementation in detector control systems like e.g. EPICS and LabVIEW.

• Summarizing:
  • Microcontroller: ATMEL AT90CAN128
    • I²C
    • CANbus
    • SPI
    • ADCs
    • ...
  • FPGA: Lattice MachX02-1200-HC
  • FTDI USB to serial UART interface
    • USB 2.0 connector
    • Power over USB
  • I²C devices
    • 6 × Single-Channel 1-Wire Master
    • 1 × 8-channel I²C-bus multiplexer with reset
    • 2 × 4-channel 8-Bit DAC - Digital-to-Analog Converter
  • galvanically isolated CAN - High-speed CAN Transceiver
    • optional external power supply
  • 2 × Rotary Code Switches, hexadecimal coding
  • Reset Button for ATMEL
  • 11 × LED's, free programmable

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Layout

• Schematic (local copy)
• top view assembly of HadCon2
  click to enlarge :
• Proportions/Dimensions of HadCon2

Microcontroller ATMEL

• AT90CAN32/64/128 (428 pages, revision H, updated 8/08), local copy

FPGA

• MachX02-1200-HC
  • Mach X02, local copy

FTDI USB to serial UART interface

• FTDI USB to serial UART interface, DS_FT232R, local copy

USART - Universal Synchronous and Asynchronous serial Receiver and Transmitter

	connects to
USART0	FTDI (USB)
USART1	FPGA

I²C

1 × 8-channel I²C-bus multiplexer with reset

• PCA9547, local copy
  • ATMEL's SDA/SCLsignals are multiplexed to up-to 8 lines.

    	Multiplexer out	Device	Signals
    ATMEL's SDA/SCL	SD0/SC0	DAC1: 4-channel DAC (DAC5574)	DACOUT1 ... DACOUT3
    		DAC2: 4-channel DAC (DAC5574)	DACOUT4 ... DACOUT7
    	SD1/SC1, SDA1 / SCL1	Connector JDI2C1
    	SD2/SC2, SDA2 / SCL2
    	SD3/SC3, SDA3 / SCL3
    	SD4/SC4, SDA4 / SCL4
    	SD5/SC5	2 × Single-Channel 1-Wire Master	OWIO0 ... OWIO1
    	SD6/SC6	2 × Single-Channel 1-Wire Master	OWIO2 ... OWIO3
    	SD7/SC7	2 × Single-Channel 1-Wire Master	OWIO4 ... OWIO5

  • Addressing:

    Device	I2C sub address			Signals
    	A2	A1	A0
    U2: 8-channel I2C-bus multiplexer	0	0	0	OWIO0

6 × Single-Channel 1-Wire Master

• I²C-to-1-Wire® bridge device DS2482-101, local copy
• Features:

  slew-rate control

  "To optimize 1-Wire waveform generation, the DS2482-101 performs slew-rate control on rising and falling 1-Wire edges and provides additional programmable features to match drive characteristics to the 1-Wire slave environment."

  pullup features

  "Programmable, strong pullup features support 1-Wire power delivery to 1-Wire devices such as EEPROMs and sensors."

• Addressing:
  

Device	I2C sub address		Signals
	A1	A0
U3: Single-Channel 1-Wire Master	1	0	OWIO0
U6: Single-Channel 1-Wire Master	1	1	OWIO1
U4: Single-Channel 1-Wire Master	1	0	OWIO2
U7: Single-Channel 1-Wire Master	1	1	OWIO3
U5: Single-Channel 1-Wire Master	1	0	OWIO4
U8: Single-Channel 1-Wire Master	1	1	OWIO5

2 × 4-channel 8-Bit DAC - Digital-to-Analog Converter

• Quad, 8-Bit, Low-Power, Voltage Output, I²C Interface Digital To Analog Converter, DAC5574, local copy
• Addressing:
  

Device	I2C sub address		Signals
	A1	A0
UDAC1: 4-channel DAC (DAC5574)	1	0	DACOUT1 ... DACOUT3
UDAC2: 4-channel DAC (DAC5574)	0	0	DACOUT4 ... DACOUT7

galvanically isolated CAN-bus

Can - High-speed Can Transceiver

• ATA6660 - High-speed Can Transceiver, local copy

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iCoupler Digital Isolator

• ADuM1100BR - iCoupler Digital Isolator, local copy

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decoupling ATMEL's JTAG from ADC input

8-bit noninverting translator

• TXB0108RGYR - 8-BIT BIDIRECTIONAL VOLTAGE-LEVEL TRANSLATOR, local copy
• OE pin is connected to ATMEL's TOSC2, by pulling it down, it decouples overlapping JTAG input from ADC inputs ADC4-7

Switches

Rotary Code Switches, hexadecimal coding

• 2 × Rotary Code Switches, hexadecimal coding - P36SMT , local copy
• pull ATMEL's PC0 ... PC8 down to GND
  
  

SWITCH1	Connector Pins	AT90CAN128 via 4.7kΩ		SWITCH2	Connector Pins	AT90CAN128 via 4.7kΩ
	1	PC0 (A8)			1	PC4 (A12)
	2	PC1 (A9)			2	PC5 (A13)
	4	PC2 (A10)			4	PC6 (A14)
	8	PC3 (A11)			8	PC7 (A15/CLK0)

Reset Button

• KMR223 ITT micro miniature switch
• pulls up ATMEL's RESET (pin20) to 3.3V via 10kΩ

Power

Input

Powering via

• micro USB JUSB1 connector, or
  
• jack DCPower

Output

GND	Can be found on several Connectors
5,0V	JCAN2	pin 4
3,3V	JCAN2	pin 6

LEDs

	pin	color	logic
AT90CAN128	PG0 ( WR )	♦ red	inverse logic: 0: on 1: off
AT90CAN128	PG1 ( RD )	♦ yellow	inverse logic: 0: on 1: off
AT90CAN128	PG2 (ALE)	♦ orange	inverse logic: 0: on 1: off
MachX02	PT17D "DONE"	♦ red
MachX02	PL4A	♦ yellow
MachX02	PL4B	♦ orange
MachX02	PL4C	♦ yellow
MachX02	PL4D	♦ orange
MachX02	PL5A	♦ red
MachX02	PL5B	♦ yellow
MachX02	PL5C	♦ orange

Connectors

JDINOUT1 / JDINOUT2

• I/O of ATMEL
  
  

JDINOUT1	Connector Pins	AT90CAN128		JDINOUT2	Connector Pins	AT90CAN128
	1	PA0 (AD0)			1	PC0 (A8)
	2	PA1 (AD1)			2	PC1 (A9)
	3	PA2 (AD2)			3	PC2 (A10)
	4	PA3 (AD3)			4	PC3 (A11)
	5	PA4 (AD4)			5	PC4 (A12)
	6	PA5 (AD5)			6	PC5 (A13)
	7	PA6 (AD6)			7	PC6 (A14)
	8	PA7 (AD7)			8	PC7 (A15/CLK0)
	9/10	GND			9/10	GND

JADC1

• ADC inputs of ATMEL
  
  

Connector Pins	AT90CAN128	comments
1	PF0 (ADC0)
2	PF1 (ADC1)
3	PF2 (ADC2)
4	PF3 (ADC3)
5	PF4 (ADC4)	overlap with JTAG inputs of ATMEL, can be decoupled by pulling TOSC2 low
6	PF5 (ADC5)
7	PF6 (ADC6)
8	PF7 (ADC7)
9/10	GND

JAtmelMISC1

• ATMEL miscellaneous I/O, SPI
  
  

Connector Pins	AT90CAN128	comments
1	PD2 (RXD1/INT2)	USART1 RXD to connection to MachX02 or External Interrupt 2 Input
2	PD1 (TXD1/INT3)	USART1 TXD to connection to MachX02 or External Interrupt 3 Input
3	PB0 ( SS )	Serial Peripheral Interface – SPI
4	PB1 (SCK)
5	PB2 (MOSI)
6	PB3 (MISO)
7	PE6 (T3/INT6)	Timer/Counter3 Clock Input or External Interrupt 6 Input
8	PE7 (ICP3/INT7)	Timer/Counter3 Input Capture Trigger or External Interrupt 7 Input
9/10	GND

JTAG1

• JTAG connector
  
  

Connector Pins	Signal	comments
1	TCK	10kΩ to V3_3
2	GND
3	TDO	← FPGA / Jumper J1 ← ATMEL
4	V3_3
5	TMS
6		not connected
7	V3_3
8		not connected
9	TDI	→ ATMEL (→ FPGA)
10	GND

JCAN1 / JCAN2

• JCAN1 basic CAN connector
  
  

JCAN1	Connector Pins	Signal	comments
	1	CANL	↔ CAN - High-speed Can Transceiver ATA6660 ↔ iCoupler Digital Isolator ↔ ATMEL
	2	CANH
	3/5	VCAN_INPUT
	4/6	GND_CAN

• JCAN2 provides optional CAN power supply,
  needs a jumper/cable/connection
  • between pin 1, GND_CAN and pins 3/5 for common GND
  • between pin 2, VCAN and pins 4 for 5,0V or
  • between pin 2, VCAN and pins 6 for 3,3V
    
    

JCAN2	Connector Pins	Signal
	1	GND_CAN
	2	VCAN
	4	V5_0
	6	V3_3
	3/5	GND_CAN

JMXOIO1 / JMXOIO2

• LVDS I/O of FPGA MachX02
  
  

JMXOIO1	Connector Pins	MachX02		JMXOIO2	Connector Pins	MachX02
	1/2	PT9A/B			1/2	PT15A/B
	3/4	PT10A/B			3/4	PT16A/B
	5/6	PT11A/B			5/6	PT16C/D
	7/8	PT12A/B			7/8	PT17A/B
	9/10	GND			9/10	GND

JDI2C1

• 4 of 8 channel output of ATMEL's single I²C bus multiplexed by an 8-channel I²C multiplexer PCA9547 (q.v. above)
  
  

Connector Pins	Multiplexer out	task	comment
1/2	SD1/SC1	SDA1 / SCL1	ATMEL's multiplexed SDA/SCL
3/4	SD2/SC2	SDA2 / SCL2
5/6	SD3/SC3	SDA3 / SCL3
7/8	SD4/SC4	SDA4 / SCL4
9/10	GND

JDAC1

• Output of the 2 4-channel DAC (DAC5574)
  
  

Connector Pins	Signal	Device	Device pin
1	DACOUT0	UDAC1	VoutA
2	DACOUT1		VoutB
3	DACOUT2		VoutC
4	DACOUT3		VoutD
5	DACOUT4	UDAC2	VoutA
6	DACOUT5	VoutB
7	DACOUT6	VoutC
8	DACOUT7	VoutD
9/10	GND

JOWIO1

• 1-wire connector for 6 channels provided by the 6 I²C driven Single-Channel 1-Wire Master DS2482

Connector Pins	Signal
1	OWIO0
2	OWIO1
3	OWIO2
4	OWIO3
5	OWIO4
6	OWIO5
7/8	V3_3
9/10	GND

Bugs, Notes, Remarks, Tweaks & Twiddling

Notes and Remarks

1-wire

1. When driving 1-wire devices, typically via JOWIO1, make sure to have (at least) 1 pull-up resistor of about 3.3kΩ on the data line of the 1-wire bus connected to the power V_DD.
   • Recommended to have it at the master, e.g. at HadCon 's connector JOWIO1,.
   • Possible option for future, directly at the connector, when using one of JDINOUT2'spins as permanent power pin.

   • Since Single-Channel 1-Wire Master DS2482 is used at JOWIO1, this isn't necessary anymore, but keep in mind for other applications.

Tweaks / Bugfix

template 1

description
Therefore Action: i.e.

1. pin 5 of UFF2 has to be disconnected from its pad and removed
2. A cable has to be soldered connecting pin 1 of UFF2 to the solder pad of pin 5

template 2

description
Therefore Action: i.e.

1. pin 5 of UFF2 has to be disconnected from its pad and removed
2. A cable has to be soldered connecting pin 1 of UFF2 to the solder pad of pin 5

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Microcontroller Code

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FPGA Code

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HadCon2 Cables

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available HadCon2 Modules

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