PalmSens EmStat3-MUX16 User manual

EmStat3-MUX16 for OEM
Connecting a MUX16 board to an EmStat3
Last revision: May 27, 2015
© 2015 PalmSens BV
www.palmsens.com

2 EmStat3-MUX16 for OEM
EmStat3-MUX16 for OEM
Contents
1EmStat3 PCB.................................................................................................................................... 3
2Connecting EmStat board to MUX16 multiplexer .............................................................................. 3
2.1 CON1 description..................................................................................................................... 4
2.2 CON2 description..................................................................................................................... 4
2.3 Pinout of sensor connector (CON4): ......................................................................................... 4
2.4 CON1 to MUX16 ...................................................................................................................... 5
3MUX16 PCB...................................................................................................................................... 5
3.1.1 Functional diagram ............................................................................................................... 5
3.2 Set standby potential with the Vaux pin .................................................................................... 6
3.3 MUX16 configurations .............................................................................................................. 7
3.4 Electrodes connections ............................................................................................................ 9
3.5 Specifications ........................................................................................................................... 9
4PCB dimensions.............................................................................................................................. 10
4.1 MUX16 PCB ........................................................................................................................... 10
4.2 EmStat3PCB.......................................................................................................................... 11
4.3 PCB’s connected – option 1................................................................................................... 12
4.4 PCB’s connected – option 2................................................................................................... 13

EmStat3-MUX16 for OEM 3
EmStat3-MUX16 for OEM
Important before you start
unpacking
Please read this quick start guide carefully before unpacking the boards from their
antistatic bags or using the kit, as it contains important information on how to avoid
damage to the PCB’s.
1EmStat3 PCB
The EmStat-series are potentiostats with an embedded microcontroller. They provide all the major
potentiostatic techniques with automatic current ranging and peripheral control.
2Connecting EmStat board to MUX16 multiplexer
EmStat3 PCB layout
The board has two pin headers: CON1 and CON2
CON1 is used to connect for instance the MUX multiplexer or any other peripheral.
CON2 is used when serial TTL communications is used and provides an external analog input and analog
output line, with a range of 0 - 4.095 V and a digital input line.
The EmStat and MUX boards can be damaged by static electricity
(electrostatic discharge or ESD). Please take adequate precautions against
static discharge during handling.
See document “EmStat3 for OEM.pdf”for more information about interfacing with the
EmStat3 board.

4 EmStat3-MUX16 for OEM
EmStat3-MUX16 for OEM
2.1 CON1 description
Pin Function
1Output line 3 reserved for Mux16 or digital input line 0
2Output line 2 reserved for Mux16/8
3Output line 1 reserved for Mux16/8 and switch box
4Output line 0 reserved for Mux16/8 and switch box and stirrer: 0 -off 1 - on
5Output: 5 V digital (max. 30 mA when powered from USB),
or input (if not powered from USB): 5 V power supply (100 mA min.),
6GND
75 V analog (max.20 mA when powered from USB)
8–5 V analog (max. 10 mA)
9AGND
10 WE
11 RE
12 CE
2.2 CON2 description
Pin Function
1Tx (serial port)
2Rx (serial port)
3Reserved (DO NOT CONNECT)
4Voltage reference (4.096 V)
5Reserved
6GND
7Reset (active high)
8Download (active low)
9ADC ch.2 (range 0 –4.095 V)
10 DAC ch.1 (range 0 –4.095 V)
11 GND
12 5 V output if powered via USB
2.3 Pinout of sensor connector (CON4):
1 ●●4
2 ●●3
1. RE: blue connector or reference electrode
2. CE: black connector or counter electrode
3. Not connected
4. WE: red connector is working electrode
IMPORTANT:
The shield of the cable must make contact with the metal case of the sensors connector.

EmStat3-MUX16 for OEM 5
EmStat3-MUX16 for OEM
2.4 CON1 to MUX16
EmStat is to be connected to the MUX board using CON1. This can be done in two ways:
Two ways of connecting the EmStat PCB to the MUX16 PCB
3MUX16 PCB
The MUX16 multiplexer is used with 2 electrode sensors or cells with up to 16 channels. It can have a
shared counter and reference electrode, or each working electrode with each its own combined
reference/counter electrode.
3.1.1 Functional diagram

6 EmStat3-MUX16 for OEM
EmStat3-MUX16 for OEM
3.2 Set standby potential with the Vaux pin
The Vaux pin can be used to set a standby potential on all unselected channels.
Make sure the following jumpers are placed:
-J3 to agnd: NOT PLACED
-J4 to standby potential: PLACED
When using Conf 1 and CE and RE are multiplexed (J4 and J5 are placed), the Vaux will not be applied
on the unselected channels since only the selected channel’s WE, CE and RE are polarized.
The Vaux pin can be connected to CON2 –pin 10 (DAC) of the EmStat to control the standby potential.
In PSTrace the DAC pin can be set in the Analog Out window in the Manual Control tab:
Also the ‘SetAnalog’ command can be used in the Scripting window.

EmStat3-MUX16 for OEM 7
EmStat3-MUX16 for OEM
3.3 MUX16 configurations
Possible sensor configurations are:
1Sensor arrays with up to 16 working and 16 combined reference/counter electrodes
2Sensor arrays with up to 16 working electrodes all sharing a reference and a counter electrode
3Sensor arrays with up to 16 working electrodes sharing a combined reference/counter electrode
In these configurations the sensors or electrodes can be multiplexed, leaving the not-selected sensors at
open circuit when jumper J3 in not placed.
J3 is placed when the potential has to be applied to all working electrodes simultaneously
Jumpers:
J1: RE to CE
Connects the CE and RE leads when placed. Place J1 when only a combined CE and RE is
applied. An alternative is to leave J1 open and always connect both the CE and RE leads to your
RE/CE electrode
J2: active
Jumper is always placed.
J3: (unselected WE) to AGND
Keeps all WE’s at applied potential when placed. If not placed only the selected WE has an
applied potential leaving not-selected WE’s at open circuit.
J4: (unselected WE) to standby potential
See section 3.3
Jumper settings for the available configurations:
Conf. 1: Sensor array with up to 16 working and 16 combined reference/counter electrodes:
Jumpers to be placed: J1 and J2
When J3 is also placed, the potential is applied to all working electrodes continuously.
Use pin 1, 3, 5 …. to 31 to connect all combined RE/CE electrodes.

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EmStat3-MUX16 for OEM
Conf. 2: Sensor array with up to 16 working electrodes all sharing one reference and one counter
electrode:
Jumper to be placed: J2
When J3 is also placed, the potential is applied to all working electrodes continuously.
Use pin 1, 5, 9, 13, 17, 21, 25 or 29 to connect RE
Use pin 3, 7,11, 15,18, 23, 27 or 31 to connect CE
Conf. 3: Sensor array with up to 16 working electrodes all sharing one combined
reference/counter
electrode:
Jumpers placed are: J1 and J2
When J3 is also placed, the potential is applied to all working electrodes continuously.
Use pin 1, 3, 5….. to 31 to connect RE/CE
*IMPORTANT REMARKS
It is not possible to apply a potential simultaneously to more than one sensor or cell each with three
electrodes. This requires a multipotentiostat, one potentiostat for each channel. This is however possible
with two electrode sensors or cells, so when combined counter and reference electrodes are applied.
The sensor configuration with 16 WE’s all having their own reference and separate counter electrode is
NOT applicable with the MUX16 multiplexer.

EmStat3-MUX16 for OEM 9
EmStat3-MUX16 for OEM
3.4 Electrodes connections
3.5 Specifications
Number of channels
2-16
Multiplexer use:
Sensor arrays with up to 16 working electrodes all sharing the
same counter and same reference electrode
Sensor arrays with up to 16 eight working and the same
combined reference/counter electrode
Sensor arrays with up to 16 working electrodes, each with its
own combined reference/counter electrode
On resistance
WE channels: 2 ohm typical (see note)
Leakage current
10 pA typical at 25 ºC (see note)
Charge injection
20 pC typical (see note)
Connections:
Shielded flat cable, with stripped end leads or
by means of the MUX16 Terminal Block (in shielded housing)
16 WE’s
CE
RE
RE and CE can be connected together and in this case
connected to up to 16 combined CE/RE electrode
analog ground for shielding
Dimensions of PCB
76 x 74 mm
Note: for very low current applications, the PCB can be populated with components with lower leakage
(10 pA typical) and lower charge injection (1 pC) properties. These components can be used for
measurements with currents always below approx. 100 uA.

10 EmStat3-MUX16 for OEM
EmStat3-MUX16 for OEM
4PCB dimensions
4.1 MUX16 PCB

EmStat3-MUX16 for OEM 11
EmStat3-MUX16 for OEM
4.2 EmStat3PCB

12 EmStat3-MUX16 for OEM
EmStat3-MUX16 for OEM
4.3 PCB’s connected –option 1
variable
(>18 if mini USB is used)
25

EmStat3-MUX16 for OEM 13
EmStat3-MUX16 for OEM
4.4 PCB’s connected – option 2
101,30
variable
16