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NOx concentration measurement chip Mysentech MY9706 designed for onboard diagnostics in diesel exhaust systems

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NOx concentration measurement chip Mysentech MY9706 designed for onboard diagnostics in diesel exhaust systems

Measurement Range : 0ppm~3000ppm

Voltage - Supply : 5V~35V

Operating Temperature : -40℃~+125℃

Interface : SPI

Description : 0ppm~3000ppm SPI SSOP-24 Gas Sensor RoHS

Mfr. Part # : MY9706

Model Number : MY9706

Package : SSOP-24

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Product Overview

The MY9706 is a highly integrated NOx conditioning chip designed for diesel exhaust Selective Catalytic Reduction (SCR) systems and onboard diagnostics in gasoline and diesel engines. It measures nitrogen oxide (NO and NO2) concentrations and nitrogen concentration in diesel exhaust. Key advantages include minimal external components, 14-bit resolution, short stabilization time, high reliability, and robust ESD protection (HBM 7000V, CDM 2000V). Utilizing advanced CMOS mixed-signal technology, it handles measurement drive, sensor electrode voltage/current, and temperature signal amplification, analog-to-digital conversion, and digital compensation, communicating with the vehicle MCU via SPI bus.

Product Attributes

Brand: mysentech
Certifications: HBM 7000V, CDM 2000V (automotive grade ESD)

Technical Specifications

Parameter	Symbol	Condition	Min	Typical	Max	Unit
General
Working Environment Temperature			-40		125
NOx Concentration Range			0		3000	ppm
NOx Concentration Resolution		14bit ADC output		0.1		ppm
Working Voltage	VDD		5		35	V
Average Current	IDD			16.2		mA
ESD Protection	HBM			7		kV
ESD Protection	CDM			2		kV
Transmission Protocol				SPI
Measurement Accuracy
NOX Concentration Range		0~100ppm			10	ppm
NOX Concentration Range		101~500ppm			10%
NOX Concentration Range		501~3000ppm			20%
O2 Concentration Range		-12%~5%			0.2%
Electrical Characteristics (T=25, VDD=5V)
Supply Voltage	VDD		4.5	5	5.5	V
Main Pump Electrode Output Current	IP0	Air condition		3.2		mA
Auxiliary Pump Electrode Output Current	IP1	Air condition		7		uA
Measurement Pump Electrode Output Current	IP2			20	1000	nA
Input Logic High	VIH (MOSI, CS, SCLK)		0.7*VDD			V
Input Logic Low	VIL (MOSI, CS, SCLK)				0.3*VDD	V
Output High Voltage	VOH		VDD-0.4			V
Output Low Voltage	VOL				0.4	V
Input Leakage Current	IIN		-1		1	uA
System Clock Frequency	FCLK			2		MHz
SPI Communication
SPI Clock Frequency	fck	50% duty cycle	0.05	1	4	MHz
SCLK High Level Time	tckh			500		ns
SCLK Low Level Time	tckl			500		ns
SCS Setup Time	tsuscs	SCS falling edge to SCLK rising edge	100			ns
MOSI Data Setup Time	tsd		100			ns
MOSI Data Hold Time	thd				100	ns
SCS Hold Time	thscs	After SCLK falling edge	150			ns
SCS Pulse Width (between bytes)	tpwscs			2.5		us
MISO Data Valid Time	tvd	From SCLK rising edge			100	ns
Absolute Maximum Ratings
Supply Voltage	VDD1/VDD2		-0.3		6	V
Voltage on HRV1/HRV2/HREF/HBC Pins			-0.3		36	V
Operating Temperature Range			-40		125

Applications

Diesel engine exhaust SCR systems (National IV, V, VI emission standards)
Gasoline engine exhaust treatment systems
Power plant desulfurization and denitrification detection and control systems
NOx sensor ceramic chip monitoring systems
Other NOx test platforms

Package and Pin Description

Model: MY9706
Package: SSOP24
Dimensions: 8.5*8.2*1.85mm

Pin Definitions

Pin No.	Pin Name	I/O	Description
1	HRV3	Analog	Heater terminal ground
2	HRV1	Analog	Heater input voltage 1 for resistance measurement
3	HRV2	Analog	Heater input voltage 2 for resistance measurement
4	HREF	Analog	Heater input voltage for shunt resistor measurement
5	REXT1	Analog	External resistor for main pump current configuration
6	GND1	Power	Analog ground
7	ICM	Analog	Common electrode for pump currents IP0, IP1, IP2
8	REXT3	Analog	External resistor for reference electrode current configuration
9	REF	Analog	External environment reference electrode
10	IP2	Analog	Measurement pump electrode, provides current IP2
11	IP1	Analog	Auxiliary pump electrode, provides current IP1
12	IP0	Analog	Main pump electrode, provides current IP0
13	HBC	Analog	Switch for controlling high-current heating bias
14	VDD1	Power	Analog 5V power supply
15	REXT2	Analog	External resistor for auxiliary and measurement pump current configuration
16	SCS	SPI	Chip enable, active low, internal pull-up
17	MISO	SPI	Slave data output, high impedance when no data output
18	MOSI	SPI	Master data input, internal pull-down
19	SCLK	SPI	Clock input, internal pull-down
20	PWM	Input	Heater terminal PWM control input
21	CLK	Input	Chip system clock input
22	VDD2	Power	Digital 5V power supply
23	GND2	Power	Digital ground
24	HVDD	Analog	Power switch for heater terminal shunt resistor control

2205271416_Mysentech-MY9706_C3025193.pdf

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