EmStat4M Specifications :: PalmSens Documentation for Developers

Features

Analog

±5 V (LR) or ±8 V (HR) compliance
single current measurement channel with max. current of ±30 mA (LR) or ±200 mA (HR)
impedance measurements between < 0.1 Ω up to 1 GΩ at frequencies from 0.016 Hz to 200 kHz
resolution of 92 fA on lowest current range (LR)
16-bit analog-to-digital converter (ADC)
1 auxiliary analog input 0 - 3 V
1 auxiliary analog output 0 - 3 V (12-bit)

Digital

UART
I2C
7 GPIO
500 MB memory for on-board data storage

Dimensions

62 mm X 40 mm X 7 mm (without connectors)

Supported Techniques

The EmStat4M supports the following electrochemical techniques:

Voltammetric Techniques:

Linear Sweep Voltammetry (LSV)
Cyclic Voltammetry (CV)
Fast Cyclic Voltammetry (FCV)
AC Voltammetry (ACV)

Pulsed Techniques:

Differential Pulse Voltammetry (DPV)
Square Wave Voltammetry (SWV)
Normal Pulse Voltammetry (NPV)

These methods can all be used in their stripping modes which are applied for (ultra-) trace analysis.

Amperometric Techniques:

Chronoamperometry (CA)
Zero Resistance Amperometry (ZRA)
Chronocoulometry (CC)
MultiStep Amperometry (MA)
Fast Amperometry (FAM)
Pulsed Amperometric Detection (PAD)

Galvanostatic Techniques:

Linear Sweep Potentiometry (LSP)
Chronopotentiometry (CP)
MultiStep Potentiometry (MP)
Open Circuit Potentiometry (OCP)

Other Techniques:

Mixed Mode (MM)
Potentiostatic and Galvanostatic Impedance Spectroscopy at fixed frequency or frequency scan vs: (EIS/GEIS)
- Fixed potential or fixed current
- Scanning potential or scanning current
- Time
Fast EIS/GEIS (FEIS/FGEIS)
- Very low interval fixed-frequency measurements

Mechanical drawing

Figure 1. EmStat4M dimensions in millimeters

Pin functions

Connection card

Figure 2. EmStat4M Pinout (showing optional LEMO cell connector)

Pin	Name	function
Con1_1	D3	Digital GPIO
Con1_2	D2	Digital GPIO
Con1_3	D1	Digital GPIO
Con1_4	D0	Digital GPIO
Con1_5	5V_In	5V power supply connected internally to USB Vbus
Con1_6	DGND	PCB common GND plane, digital zone
Con1_7	D4	Digital GPIO
Con1_8	SENSE	Potentiostat Sense Electrode
Con1_9	AGND	PCB common GND plane, Analog zone
Con1_10	WE	Potentiostat Working Electrode
Con1_11	RE	Potentiostat Reference Electrode
Con1_12	CE	Potentiostat Counter Electrode

Con2_1	TxD	UART Transmit
Con2_2	RxD	UART Receive
Con2_3	E_UNIPOLAR_OUT	E monitor, scaled to a voltage between 0 and 3, centered around 1.5 V where: LR: VRE = -2.1 * (Vout – 1.5) HR: VRE = -4.2 * (Vout – 1.5)
Con2_4	I_BIPOLAR_OUT	Potentiostat measured current (scaled), this pin has a 1 kOhm output impedance i = Vout * current range
Con2_5	D5	Digital GPIO
Con2_6	DGND	PCB common GND plane, digital zone
Con2_7	nRESET	Active low reset
Con2_8	nDWNLD	Active low FW update
Con2_9	ADC_in	Auxiliary ADC input
Con2_10	DAC_out	Auxiliary DAC out
Con2_11	DGND	PCB common GND plane, digital zone
Con2_12	5V_In	5V power supply connected internally to USB Vbus

Con3_1	CTS	UART Clear To Send
Con3_2	RTS	UART Ready to Send
Con3_3	SDA_EXT	I2C SDA. Internally pulled up to 3.3V via a 10K resistor
Con3_4	SCL_EXT	I2C SCL. Internally pulled up to 3.3V via a 10K resistor
Con3_5	Reserved	Reserved
Con3_6	Reserved	Reserved
Con3_7	E_SET	External potentiostat voltage setpoint control
Con3_8	n3.3VD_SHDN	Active low Shutdown. Internally pulled up to 5V with 100K resistor. Pulling to GND disables all power on the ES4
Con3_9	D6	Digital GPIO
Con3_10	3.3V_OUT	3.3V digital supply. From a switching regulator on the ES4. Draw maximum 50 mA from this pin
Con3_11	VPST-	Potentiostat negative power rail. Draw maximum 20 mA from this pin. LR: -7V (typical) HR: -9.75V (typical)
Con3_12	VPST+	Potentiostat positive power rail. Draw maximum 20 mA from this pin. LR: 7V (typical) HR: 9.75V (typical)

Name

function

Con1_1

D3

Digital GPIO

Con1_2

D2

Digital GPIO

Con1_3

D1

Digital GPIO

Con1_4

D0

Digital GPIO

Con1_5

5V_In

5V power supply connected internally to USB Vbus

Con1_6

DGND

PCB common GND plane, digital zone

Con1_7

D4

Digital GPIO

Con1_8

SENSE

Potentiostat Sense Electrode

Con1_9

AGND

PCB common GND plane, Analog zone

Con1_10

WE

Potentiostat Working Electrode

Con1_11

RE

Potentiostat Reference Electrode

Con1_12

CE

Potentiostat Counter Electrode

Con2_1

TxD

UART Transmit

Con2_2

RxD

UART Receive

Con2_3

E_UNIPOLAR_OUT

E monitor, scaled to a voltage between 0 and 3, centered around 1.5 V where:
LR: VRE = -2.1 * (Vout – 1.5)
HR: VRE = -4.2 * (Vout – 1.5)

Con2_4

I_BIPOLAR_OUT

Potentiostat measured current (scaled), this pin has a 1 kOhm output impedance
i = Vout * current range

Con2_5

D5

Digital GPIO

Con2_6

DGND

PCB common GND plane, digital zone

Con2_7

nRESET

Active low reset

Con2_8

nDWNLD

Active low FW update

Con2_9

ADC_in

Auxiliary ADC input

Con2_10

DAC_out

Auxiliary DAC out

Con2_11

DGND

PCB common GND plane, digital zone

Con2_12

5V_In

5V power supply connected internally to USB Vbus

Con3_1

CTS

UART Clear To Send

Con3_2

RTS

UART Ready to Send

Con3_3

SDA_EXT

I2C SDA. Internally pulled up to 3.3V via a 10K resistor

Con3_4

SCL_EXT

I2C SCL. Internally pulled up to 3.3V via a 10K resistor

Con3_5

Reserved

Con3_6

Reserved

Con3_7

E_SET

External potentiostat voltage setpoint control

Con3_8

n3.3VD_SHDN

Active low Shutdown. Internally pulled up to 5V with 100K resistor. Pulling to GND disables all power on the ES4

Con3_9

D6

Digital GPIO

Con3_10

3.3V_OUT

3.3V digital supply. From a switching regulator on the ES4. Draw maximum 50 mA from this pin

Con3_11

VPST-

Potentiostat negative power rail. Draw maximum 20 mA from this pin.
LR: -7V (typical)
HR: -9.75V (typical)

Con3_12

VPST+

Potentiostat positive power rail. Draw maximum 20 mA from this pin.
LR: 7V (typical)
HR: 9.75V (typical)

Absolute maximum ratings

Parameter	Rating
V_IN to GND	-0.3 V to +5.5 V
Analog Input Voltage to GND	-0.3 V to +3.6 V
Digital Input Voltage to GND	-0.3 V to +3.6 V
Total Positive GPIO Pins Current	50 mA
Total Negative GPIO Pins Current	-50 mA
Storage temperature	-65 °C to +100 °C
Operating temperature	-40 °C to +85 °C
Hand soldering (single pin)	400 °C for 10 s
ESD Human Body Model (HBM)	4 kV
ESD Field-Induced Charged Device Model (FICDM)	1 kV

Parameter

Rating

V_IN to GND

-0.3 V to +5.5 V

Analog Input Voltage to GND

-0.3 V to +3.6 V

Digital Input Voltage to GND

-0.3 V to +3.6 V

Total Positive GPIO Pins Current

50 mA

Total Negative GPIO Pins Current

-50 mA

Storage temperature

-65 °C to +100 °C

Operating temperature

-40 °C to +85 °C

Hand soldering (single pin)

400 °C for 10 s

ESD Human Body Model (HBM)

4 kV

ESD Field-Induced Charged Device Model (FICDM)

1 kV

Electrical specifications

Parameter

Min

Typical

Max

Unit

Details

ADC

Data Rate

1M

SPS

Resolution

16

Bits

Analog input (CON2-9)

Leakage Current

-1.5

1.5

uA

Input Voltage Range

0.05

3

V

EIS measurement

Frequency range

10u

200k

Hz

Applied AC votlage

1

900

mVrms

Amplitude scaling resolution

14

Bits

Sine DAC resolution

12

Bits

Potentiostat circuit

RE Input Bias Current

2

10

pA

RE input, 25 °C

SE Input Bias Current

2

10

pA

SE input, 25 °C

Offset voltage

0.1

1

mV

Source/Sink current (LR)

-30

30

mA

Source/Sink current (HR)

-200

200

mA

Applied potential acc.

0.04

0.2

%

Measured current acc.

≤ 0.2

%

Full Scale Range

Bandwidth settings

0.32, 3.2, 30 or 570

kHz

Selectable bandwidth

Electrometer Bandwidth

10

MHz

Current range bandwidth

1 nA, 10 nA (LR)

23

Hz

100 nA, 1 µA

2.3

kHz

10 µA, 100 µA, 1 mA

230

kHz

10 mA

500

kHz

100 mA (HR)

500

kHz

Main DAC

Resolution

16

Bits

Voltage Range (LR)

-3

3

V

Voltage Range (HR)

-6

6

V

Bandwidth

10

kHz

DAC for Aux (CON2-10)

Resolution

12

Bits

Voltage Range

0.05

3

V

GPIO

Input Voltage Low

-0.2

0.3

V

Input Voltage High

0.7

3.5

V

Output Voltage Low

0

0.4

V

Output Voltage High

2.9

3.3

V

Pin output source/sink current

±5

mA

Program memory

Endurance

10,000

Cycles

Data Retention

30

Years

File storage memory

Storage size

500

MByte

Power requirements

V_IN voltage range

4.5

5

5.5

V

EmStat4M HR

250

mA

@ 1 mA (WE)

320

mA

@ 30 mA (WE)

750

mA

@ 200 mA (WE)

EmStat4M LR

150

mA

@ 1 mA (WE)

250

mA

@ 30 mA (WE)

UART

Baudrate

9600

921600

bit/s

Default: 230400 in v1.000

I2C

Clock speed

100

400

kHz

Internal pull-up

10

kOhm

Pull-up to 3.3V

Power supply

Driving the EmStat4M V_IN directly from a switching regulator may introduce measurement noise. Care should be taken to provide clean power to the V_IN pin.

Heat Dissipation

The EmStat4 HR requires two heatsinks to be present on the golden pads at the bottom of the PCB. The board comes standard with the following two heatsinks from Fischer Elektronik: part numbers ICK PLCC 28 and ICK SMD F 10 SA.

It is recommended to ensure a steady airflow over the heatsinks when running measurements for a long duration (>10 minutes) with the 100 mA range enabled.

Links

Design resources

The 3D model and Altium symbol and PCB footprint can be found in the download section of our website: https://www.palmsens.com/emstat4m

Accessories

SPE-connector: DS1020-03ST1D