SMU Instrument

Key Features

USB Controlled
Power supply 0-15V, 0-2.5A
x2 Independent power channel
Accurate current Measurement
Remote sense voltage feedback
Built-in soft fuse function
I2C/SPI expansion
Powered by +24V/+5V

Description

The SMU Instrument provides two high-precision software-controlled supply voltage channels with individual built-in software fuses. It has an onboard high-performance MCU with an Arm® Cortex®-M7 core running a RTOS (Real-Time Operating System), which also provides a USB FS/HS channel to an external host.

Each channel offers configurable settings of slew rate and also remote sense voltage feedback with possibility to increase voltage accuracy. Current can be measured in 3 different ranges (mA, uA, nA) with high precision configured manual or in automatic mode. Different types of external expansion such as number of power supply channels is possible by utilizing the built-in expansion interface.

SMU Instrument Block Diagram

SMU Instrument Layout

Pinout

Pin	Name	Description	Pin	Name	Description
A1	+24V_IN	+24V Input Power Supply	B1	USB_N	USB D- signal
A2	+24V_IN	+24V Input Power Supply	B2	USB_P	USB D+ signal
A3	+24V_IN	+24V Input Power Supply	B3	GND	Ground
A4	+24V_IN	+24V Input Power Supply	B4	GND	Ground
A5	+5V_IN	+5V Input Power Supply	B5	GND	Ground
A6	+5V_IN	+5V Input Power Supply	B6	GND	Ground
A7	+5V_IN	+5V Input Power Supply	B7	GND	Ground
A8	+5V_IN	+5V Input Power Supply	B8	GND	Ground
A9	RST_N	Reset signal	B9	RSV	Reserved
A10	PWR_EN	Power enable of the instrument	B10	RSV	Reserved
A11	RSV	Reserved	B11	RSV	Reserved
A12	EXP_I2C_SCL/EXP_SPI_CS1	Expansion Interface I2C SCL or SPI CS1	B12	EXP_SPI_SCLK	Expansion Interface SPI Clock-signal
A13	EXP_I2C_SDA/EXP_SPI_CS2	Expansion Interface I2C SDA or SPI CS2	B13	EXP_SPI_MOSI	Expansion Interface SPI MOSI
A14	EXP_SPI_CS3	Expansion Interface SPI CS3	B14	EXP_SPI_MISO	Expansion Interface SPI MISO
A15	EXP_SPI_CS4	Expansion Interface SPI CS4	B15	EXP_SPI_CS0	Expansion Interface SPI CS0
A16	EXP_RST_N	Expansion Interface Reset output active low	B16	GND	Ground
A17	+5V_EXP	+5VDC Power Supply for Expansion	B17	GND	Ground
A18	RSV	Reserved	B18	RSV	Reserved
A19	RSV	Reserved	B19	RSV	Reserved
A20	RSV	Reserved	B20	RSV	Reserved
A21	RSV	Reserved	B21	RSV	Reserved
A22	RSV	Reserved	B22	RSV	Reserved
A23	VSENSE2+	Remote pos voltage feedback 2	B23	VSENSE2-	Remote neg voltage feedback 2
A24	+VOUT2	Output Power Supply 2	B24	GND	Ground
A25	+VOUT2	Output Power Supply 2	B25	GND	Ground
A26	+VOUT2	Output Power Supply 2	B26	GND	Ground
A27	+VOUT2	Output Power Supply 2	B27	GND	Ground
A28	VSENSE1+	Remote pos voltage feedback 1	B28	VSENSE1-	Remote neg voltage feedback 1
A29	+VOUT1	Output Power Supply 1	B29	GND	Ground
A30	+VOUT1	Output Power Supply 1	B30	GND	Ground
A31	+VOUT1	Output Power Supply 1	B31	GND	Ground
A32	+VOUT1	Output Power Supply 1	B32	GND	Ground

Absolute Maximum Ratings

Exceeding ABSOLUTE MAXIMUM RATINGS can cause permanent damage to the device.

	Min	Max
USB_P, USB_N	-0.5 V	+5.5 V
+24V Input Power Supply	-0.3 V	+25.5 V
+5V Input Power Supply	-0.3 V	+5.2 V
Expansion +5V Output Power Supply Current		+200 mA
Voltage on any Expansion Digital Pin	-0.3 V	+3.6 V
Output Current		+2.5 A
VSENSEx Remote Voltage Feedback		+15 V

Recommended Operating Conditions

Specifications are valid at 25°C unless otherwise noted and with a warm-up time of >10min.

	Conditions	Min	Typ	Max
+24V Input Power Supply		+23.0 V	+24.0 V	+25.0 V
+5V Input Power Supply		+4.8 V	+5.0 V	+5.2 V
+24V Input Power Supply Quiescent Current	Enabled Disabled		+28 mA +8 uA
+5V Input Power Supply Quiescent Current	Enabled Disabled		+150 mA +43 uA
Expansion +5V Output Power Supply	Load = +140 mA	+4.8 V	+5.0 V	+5.2 V
Expansion +5V Output Power Supply Current				+140 mA
Expansion Digital Input High Voltage		+2.4 V
Expansion Digital Input Low Voltage				+0.8 V
Expansion Digital Output High Voltage	Load = +2 mA	+2.6 V
Expansion Digital Output Low Voltage	Load = -2 mA			+0.7 V
Expansion I2C bit rate	Fast-mode			400 kbit/s
Expansion SPI Clock frequency				13.5 MHz
Output Voltage Range		0.0 V		+15.0 V
Output Voltage Resolution		12 bits
Output Voltage Accuracy		-20.0 mV		+20.0 mV
Output Voltage Slew Rate
Output Voltage Load-transient Regulations
Output Voltage Noise
Output Current Measurement Range
Output Current Measurement Resolution
Output Current Measurement Accuracy
Output Current Software Fuse Range
Output Current Software Fuse Resolution
Output Current Software Fuse Response Time
Sense Voltage Range
Sense Voltage Resolution
Sense Voltage Accuracy

Typical Performance Characteristics

Environmental

The SMU Instrument is designed for following environmental conditions and for indoor use only.

	Min	Max
Operating Temperature	0°C	+55°C
Operating Humidity`	10% RH	90% RH
Storage Temperature	0 °C	+70 °C
Storage humidity	5% RH	95% RH
Pollution Degree		2

Safety and Compliance

Safety

Update This Product is designed to meet the requirements of Electrical Safety Partial Testing according to EN 61010-1:2010 + A1:2019 + AC: 2019 and EN 61010-2-030:2021 + A11:2021.

Electromagnetic Compatibility

This product is designed to meet the requirements of EMC Testing according to EN 61326-1:2021 and CE standards of EMC for electrical equipment for measurement, control, and laboratory use.

CE Compliance

This product meets the essential requirements of applicable European Directives, as follows:

2014/35/EU; Low-Voltage Directive (safety)
2014/30/EU; Electromagnetic Compatibility Directive (EMC)

RoHS

Waste Electrical and Electronic Equipment (WEEE)

For EU Customers: at the end of the product life cycle, all Mikrodust products must be disposed of according to local laws and regulations.

Ordering information

Item	Part Number
AtoMik® Source Monitoring Unit (SMU) Instrument	IPS-1000-C2