Analog Outputs

Overview

The ECU has a number of Analog to Digital Converter (ADC) inputs that can be used to measure analog signals. These inputs may be assigned to different functions by setting options in the calibration.

Software Selectable Pull-up/Pull-down Resistors

Some channels have software selectable pull-up or pull-down resistors. These can be used to bias the input voltage to a known level when the input is not connected. This can be useful for sensors that do not have a built-in pull-up or pull-down resistor.

There are typically 2 options to control the pull-up or pull-down resistor. For example, the following table shows the options for Analog 10:

A10 Pull	T1 Pull High	Description
Off	Off	No pull-up or pull-down resistor (floating)
Off	On	No pull-up or pull-down resistor (floating)
On	Off	Pull-down resistor enabled
On	On	Pull-up resistor enabled

Some of the timing inputs have a pull-up resistor that can be enabled or disabled. Often the timing input would also have a fixed higher value pull-down resistor.

For example, the following table shows the options for T1 on a typical ECU:

T1 Pull-up	Description
Off	10k Pull-Down (used with VR sensor)
On	1k Pull-Up (used with Hall sensor)

Internal Switches

Overview

Input from various sources can be used to generate digital ‘switch’ (on/off) channels by a variety of methods. These internal switch channels may be selected numerically to control various functions in the calibration.

Some switches may be configured to come from external sources, such as CAN messages or digital input pins.

Comparator Switches

Timed Switches

Table Lookup Switches

Switch A.

Generic Switches

Switches selected from user source (e.g. CAN).