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Synchronised Pulsed Inputs (SPI)
Synchronised Pulsed Inputs are capable of
measuring the position, duty cycle, frequency
or state of a signal, as well as analog voltage
inputs.
These inputs are suitable for sensors such as
cam position sensors, fuel composition sensors,
road speed sensors and flat shift switch.
Synchronised Pulsed Inputs are compatible
with digital (hall effect or optical) and reluctor
(analog) based sensors, have a maximum input
voltage rating of 25V and can measure up to
50KHz Maximum frequency.
Specs:
• -10 to 10V digital input
• 0 to 5V analog input
• 1 million samples per second
• Selectable 1k pull-up to 5V
• -15 to 30V indefinite withstand
• 22.5kHz signal frequency max
HT-011000
FLEX
FUEL SENSOR
FUEL SENSOR
FREQUENCY BASED FLEX FUEL SENSOR
Example Wiring Connections
KNOCK
SIGNAL GROUND
Knock Inputs
A knock sensor detects engine knock and sends
a voltage signal to the ECU.
The NEXUS R5 ECU uses the knock sensor
signal to modify ignition timing if knocking
occurs. Knock detection can be performed by
the ECU by installing a compatible piezoelectric
knock sensor mounted to the engine block.
TO OTHER
DEVICES
Example Wiring Connections
21
It is recommended that twin-core shielded cable
is used for knock sensors. Shields must be
terminated to battery ground at one end only.
Specs:
• -2.5 to 2.5V AC input only
• 160Hz to 48kHz signal frequency band
• +-3V indefinite AC voltage withstand
• 50V indefinite DC withstand
SPI
SIGNAL GROUND
HCO
KNOCK SENSOR
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