rusefi_documentation/Hellen64-Miata-NA6-94.md

Hellen 64 Miata NA6 94

This development board is PnP for NA6 and 94-95 Miatas.

Download release firmware

Snapshot firmware bundle

Interactive Pinout

Issue tracker

Mazda Miata 1990 Schematic

Mazda Miata 1994 Schematic

Hardware features

• knock detection module
• build-in WBO
• battery to keep real time clock running
• options port for additional I/O

Rev A

Schematic Rev A

Rev B

Schematic Rev B

Extension Pads (rev. b)

Pin	Type	Comments
	Outputs
P9	PP	1.5 A peak
P10	PP	1.5 A peak
P12	Bridge driver A	3 A peak
P11	Bridge driver A	3 A peak
P13	Bridge driver B	3 A peak
P14	Bridge driver B	3 A peak
P8	Low side	1.4 A
P15	Low side	1 A
P16	Low side	1 A
P17	Low side (always hot)	0.5 A
P18	Low side	0.5 A
P19	Low side	0.5 A
P20	Low side	0.5 A
P21	Low side	0.5 A
P22	High side	4 A
P23	High side	4 A
P24	PP 5 V	20 mA
P25	PP 5 V	20 mA
P29	PP 5 V	20 mA
P30	PP 5 V	20 mA
P31	PP 5 V	20 mA
P32	PP 5 V	20 mA
	Inputs
P1	Knock
P26	Discrete pull down
P27	Discrete pull down
P28	Discrete pull down
P33	Analog pull up
P34	Analog pull up
P35	Analog pull down
P36	Analog pull up
P37	Analog pull up
P38	Analog pull down
P39	Analog pull down
P40	Analog pull up
P41	Analog pull up
P42	Discrete pull up
P43	Discrete pull down
P44	Discrete pull up
P45	Discrete pull down
	MCU
P3	GPIO
P4	GPIO
P5	GPIO
P6	GPIO
J4	SPI, UART, I2C, GPIO	See silkscreen and schematic for details

Options Port (rev. b)

Pin	Type	Comments
2A	Ground
2B	+5v
2C	WBO Heater -	LSU 4.9 Pin 3
2D	+12v	LSU 4.9 Pin 4
2E	WBO R Trim	LSU 4.9 Pin 5
2F	WBO Ip	LSU 4.9 Pin 1
2G	WBO Vs/Ip	LSU 4.9 Pin 2
2H	WBO Vs	LSU 4.9 Pin 6
2I	VVT Output
2J	Boost Control Output
2K	Ground
2L	Digital Input	Flex Sensor
2M	Pressure Sensor
2N	Temperature Sensor
2O	Ground
2P	Knock Sensor Input

Options Port Schematic

Additional Hardware

Options Port Connector

LSU 4.9 Wideband Connector

LSU 4.9 Wideband Sensor Or Similar