Switches and analog multiplexer
Introduction
The switches and analog (SWAN) multiplexer can be used to provide additional analog
inputs and additional digital switch inputs to a Pectel ECU.
The SWAN multiplexer is available in two variants, AC and DC. In the AC variant the analog
inputs are AC-coupled for knock sensor inputs and in the DC variant the analog inputs are
DC-coupled for analog inputs.
Each multiplexer variant can be configured via the MODESEL pin to provide extra digital
switch inputs in place of four knock / analog inputs. The following table outlines the inputs
that are available on each SWAN multiplexer variant.
Input type
Knock
Knock or digital (controlled by MODESEL)
Analog
Analog or digital (controlled by MODESEL)
Digital
AC variant
4
4
4
DC variant
4
4
4
The multiplexer control requires three ECU low-side driver outputs: one that defines the
behaviour of the configurable analog / digital inputs, and two address lines that define which
of the input signals is provided on each multiplexer output. The control inputs are pulled up
to 5V by the SWAN multiplexer.
Inputs
AIN1 to AIN4
Dedicated analog inputs that accept knock sensors (AC variant) or standard analog sensors (DC variant).
The following table details the states of the address lines that define which of the input
signals is provided on the multiplexer output.
ADDR1 (pin 11)
0
0
1
1
ADDR0 (pin 10)
0
1
0
1
KNOCKOUT1
AIN1
AIN2
AIN3
AIN4
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Digital switches
Both multiplexer variants provide four dedicated digital switch inputs (SWIN1 to SWIN4).
The four digital inputs are treated as a 4-bit binary number, which is converted into a
discrete analog voltage level between 0V and 5V on SWITCHOUT1. The values of the
output voltages that correspond to the states of the four digital inputs are detailed in the
following table.
SWIN 4
Open
Open
Open
Open
Open
Open
Open
Open
Closed
Closed
Closed
Closed
Closed
Closed
Closed
Closed
SWIN 3
Open
Open
Open
Open
Closed
Closed
Closed
Closed
Open
Open
Open
Open
Closed
Closed
Closed
Closed
SWIN 2
Open
Open
Closed
Closed
Open
Open
Closed
Closed
Open
Open
Closed
Closed
Open
Open
Closed
Closed
SWIN 1
Open
Closed
Open
Closed
Open
Closed
Open
Closed
Open
Closed
Open
Closed
Open
Closed
Open
Closed
SWITCHOUT1
0V
0.333V
0.667V
1V
1.333V
1.667V
2V
2.333V
2.667V
3V
3.333V
3.667V
4V
4.333V
4.667V
5V
AIN5 to AIN8
The behaviour of these inputs is dependent on the MODESEL state. When the MODESEL
signal is allowed to pull-up to 5V, the internal pull-up resistors on these signals are disabled and AIN5 to AIN8 are treated as analog inputs, and multiplexed to KNOCKOUT2 in
the same manner as AIN1 to AIN4. When the MODESEL pin is switched ground, then the
internal pull-up resistors are enabled and the digital levels on AIN5 to AIN8 are converted
to a discrete analog voltage level on SWITCHOUT2 in the same manner as SWIN1 to
SWIN4.
Ground pins
There are two ground pins on the connector. One of these pins should be connected to the
ECU knock ground or analog ground. The other should be connected to the sensor ground
or the switch ground. These two ground pins are shorted internally at the connector.
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Product Information 29E-071557-1E
Functional diagram
The diagram below shows the functions of the SWAN multiplexer. The pin numbers refer
to the Autosport connector AS212-35PN pins.
ADDR (0,1)
pin 10 pin 11
SWAN multiplexer
Pin 1
Pin 2
Pin 3
Analog (DC) or Knock (AC)
Mux
Pin 14
Analog (DC) or Knock (AC)
Mux
Pin 15
Pin 4
Pin 5
Pin 6
Pin 7
Pin 8
Pin 17
Switch Convertor
Pin 12 (MODESEL)
Pin 18
Pin 19
Pin 16
Switch Convertor
Pin 20
Pin 21
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Dimensions
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Dimensions in millimeters and (inches)
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Specifications
Ordering information
Description
Value
Product
Part number
Max. power supply voltage
18V
Knock multiplexer
01E-500890-AC
AIN input voltage
–8V to +8V
Analog multiplexer
01E-500890-DC
SWIN internal pull-up resistor to +5V 10k Ohms
AIN internal pull-up resistor to +5V
(MODESEL unlinked)
10k Ohms
Max +70°C
Min –25°C
–40°C to
+85°C
Operating temperature
Storage temperature
Weight
<125 grams
IP Rating
IP65
Connector information
AS212-35PN connector
Pin Signal name
Knock variant (AC) description
Analog variant (DC) description
1
AIN1
Knock multiplexer input
Analog multiplexer input
2
AIN2
Knock multiplexer input
Analog multiplexer input
3
AIN3
Knock multiplexer input
Analog multiplexer input
4
AIN4
Knock multiplexer input
Analog multiplexer input
5
AIN5
Knock multiplexer / switch decoder input
Analog multiplexer / switch decoder input
6
AIN6
Knock multiplexer / switch decoder input
Analog multiplexer / switch decoder input
7
AIN7
Knock multiplexer / switch decoder input
Analog multiplexer / switch decoder input
8
AIN8
Knock multiplexer / switch decoder input
Analog multiplexer / switch decoder input
9
GND
Ground
Ground
10
ADDR0
Multiplexer / switch decoder address bit
Multiplexer / switch decoder address bit
11
ADDR1
Multiplexer / switch decoder address bit
Multiplexer / switch decoder address bit
12
MODESEL
Knock multiplexer / switch decoder
selection
Analog multiplexer / switch decoder
selection
13
GND
Ground
Ground
14
KNOCKOUT1
Knock multiplexer output (AIN1 to AIN4)
Analog multiplexer output (AIN1 to AIN4)
15
KNOCKOUT2
Configurable inputs knock multiplexer
mode output (AIN5 to AIN8)
Configurable inputs analog multiplexer
mode output (AIN5 to AIN8)
16
SWITCHOUT1
Switch decoder output (SWIN1 to SWIN4) Switch decoder output (SWIN1 to SWIN4)
17
SWITCHOUT2
Configurable inputs switch decoder mode
output (AIN5 to AIN8)
Configurable inputs switch decoder mode
output (AIN5 to AIN8)
18
SWIN1
Switch decoder input
Switch decoder input
19
SWIN2
Switch decoder input
Switch decoder input
20
SWIN3
Switch decoder input
Switch decoder input
21
SWIN4
Switch decoder input
Switch decoder input
22
VBATT
Battery voltage supply
Battery voltage supply
4
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Product Information 29E-071557-1E
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