AI-EXP32Specifications

Document Revision 1.0, March, 2009
© Copyright 2009, Measurement Computing Corporation

Specifications
All specifications are subject to change without notice.
Typical for 25 °C unless otherwise specified.
All specifications apply to all temperature and voltage input channels unless otherwise specified.
Specifications in italic text are guaranteed by design.

Compatibility
Table 1. Host product compatibility
Product nameProduct description

USB-2416-4AO Full-speed, multiplexed 24-bit measurement system that provides up to 16 differential and up
to 32 single-ended (SE) analog inputs.
 Eight high-speed lines of digital I/O and two 32-bit counters.
 Four 16-bit analog output channels with an update rate of 1000 S/s and an output range of±10 V.
 Full-speed, multiplexed 24-bit measurement system that provides up to 16 differential and up
to 32 single-ended (SE) analog inputs.
 Eight high-speed lines of digital I/O and two 32-bit counters.

USB-2416

Analog input
Table 2. General analog input specifications
Parameter

Conditions

Specification

Number of channels

Up to 32 channels individually software-configurable as singleended or differential.
Thermocouples require differential mode.
For each channel configured as differential, you essentially lose asingle-ended channel.

Channelconfigurations

Temperature sensor input, software programmable to match
sensor type
Voltage input

Input voltage range

Absolute maximum
input voltage

Thermocouple mode

±0.078125 V

Voltage mode

±20 V, ±10 V, ±5 V, ±2.5 V, ±1.25 V, ±0.625 V, ±0.3125 V,±0.15625 V, ±0.078125 V, software- configurable±30 V maximum (power on)±10 V maximum (power off)
2 GΩ (power on)
390 Ω (power off)
±20 nA±1 uA maximum

CxH-CxL relative to GND

Input impedance
Input leakage current
Input voltage >±30V(power on/off)
Input capacitance
Maximum working
voltage (signal +common mode)
Crosstalk
Input couplingWarm-up time
Open thermocouple
detectVoltage mode: ±20V range
Voltage mode: all othervoltage input ranges
Adjacent channels

590 pf±20.01 V maximum±10.25 V maximum
100 dBDC
15 minutes minimum
Automatically enabled when the channel is configured for athermocouple sensor.

2AI-EXP32

Specifications

CJC sensor accuracy15 °C to 35 °C
0 °C to 55 °C±0.15 °C typical±0.5 °C maximum

Channel configurations
Table 3. Channel configurations
ChannelCategory

CxH/CxL

Thermocouple
The AI-EXP32 GND and DGND pins are isolated from earth ground.
You can connect thermocouple sensors to voltages referenced to earth
ground as long as isolation between the GND/DGND pins and earth
ground is maintained.
Unused input channels can be left floating or tied to GND (pins 17, 18,49, 50).
Voltage
When connecting differential voltage inputs to a floating voltage source,
the user must provide a DC return path from each voltage input toground. To do this, connect a resistor from each input to a GND pin (pins17, 18, 49, 50). A value of approximately 100 kΩ can be used for mostapplications.
Voltage

CxH/CxL

CxH/CxL

Conditions

Specification
16 differential
channels

16 differential
channels

32 single-ended
channelsCompatible sensors
Table 4. Compatible sensor type specifications
Parameter

Conditions

Thermocouple

J: -210 °C to 1200 °C
K: -270 °C to 1372 °C
R: -50 °C to 1768 °CS: -50 °C to 1768 °C
T: -270 °C to 400 °C
N: -270 °C to 1300 °C
E: -270 °C to 1000 °C
B: 0 °C to 1820 °CAccuracy
Thermocouple measurement accuracy
The AI-EXP32 is a multiplexer-based channel expansion module that increases the number of thermocouple
input channels of a USB-2416 series host module. For thermocouple accuracy information, refer to theelectrical specification of the particular USB-2416 host module that is interfacing with the AI-EXP32.
There is a CJC sensor for each terminal block of the module. The thermocouple measurement accuracy assumes
that the screw terminals are at the same temperature as the CJC sensor.
Connect thermocouples to the AI-EXP32 such that they are floating with respect to GND (pins 17, 18, 49, 50).
When configuring thermocouple sensors, keep any stray capacitance relative to GND (pins 17, 18, 49, 50) as
small as possible to avoid settling time and accuracy errors.

3

AI-EXP32

Specifications

Analog input DC voltage measurement accuracy:
The AI-EXP32 is a multiplexer-based channel expansion module that increases the number of voltage input
channels of a USB-2416 series host module. For voltage accuracy information, refer to the electrical
specification of the USB-2416 host device that is the interface to the AI-EXP32 interface.

Digital input/output
Table 5. Digital input specifications
Number of I/O
Configuration
Input voltage range
Input type
Input characteristics
Maximum input voltage range
Pull-up/pull-down configuration

Transfer rate (software paced)
Input high voltage
Input low voltage
Schmitt trigger hysteresis

16 channels
Each DIO bit can be independently read from (DIN) or written to (DOUT).
The DIN bits can be read at any time whether the DOUT is active or tri-stated.
0 to +15 V
CMOS (Schmitt trigger)
47 kΩ pull-up/pull-down resistor, 28 kΩ series resistor
0 to +20 V maximum (power on/off, relative to DGND pins 29,30,61,62)
All pins pulled up to +5 V via individual 47 kΩ resistors.
 The JP1 (DIO 8- 15) shorting block default position is pull-up or "HI." The JP2 (DIO 16- 23) shorting block default position is pull-up or "HI."Pull down capability is available by placing either of the JP1 and JP2 shorting
blocks in the "LO" position.
500 port reads or single-bit reads per second, typical.
1.3 V minimum, 2.2 V maximum
1.5 V maximum, 0.6 V minimum
0.4 V minimum, 1.2 V maximum

Note 1: DGND pins (pins 29, 30, 61, 62) are recommended for use with digital input and digital output pins. The DGND andGND pins are common and are isolated from earth ground.
Table 6. Digital output specifications
Number of I/O
Configuration
Output characteristics
Pull-up configuration

Transfer rate (software paced)
Output voltage range

Drain to source breakdown voltageOff state leakage current (Note 5)
Sink current capability
DMOS transistor on-resistance(drain to source)

16 channels
Each DIO bit can be independently read from (DIN) or written to (DOUT).
The DIN bits may be read at any time whether the DOUT is active or tri-stated47 kΩ pull-up, open drain (DMOS transistor)
All pins pulled up to +5 V via individual 47 kΩ resistors.
 The JP1 (DIO 8- 15) shorting block default position is pull-up or "HI." The JP2 (DIO 16- 23) shorting block default position is pull-up or "HI."Digital output – 500 port writes or single-bit writes per second typical.
 0 to +5 V (no external pull up resistor, internal 47 kΩ pull-up resistors connected
to +5 V by default)
 0 to +15 V maximum (Note 4)+50 V minimum
0.1 µA 150 mA maximum (continuous) per output pin
 150 mA maximum (continuous) for all eight channels
4Ω

Note 2: Each DMOS transistor’s source pin is internally connected to GND.
Note 3: DGND pins (pins 29, 30, 61, 62) are recommended for use with digital input and digital output pins. The DGND andGND pins are common and are isolated from earth ground.
Note 4: The external pull-up is connected to the digital output bit through an external pull-up resistor. Adding an external pullup resistor connects it in parallel with the internal 47k Ω pull-up resistor of that particular digital input/output bit.
Careful consideration should be made when considering the external pull-up resistor value and the resultant pull-up
voltage produced at the load.

4

AI-EXP32

Specifications

Note 5: Does not include the additional leakage current contribution that may occur when using an external pull-up resistor.

PowerTable 7. Power specifications
ParameterConditions

Specification+5VUSER output voltage range
User +5VUSER output current

Available at terminal block pin 19
Available at terminal block pin 19

4.9 V minimum to 5.1 V maximum
10 mA maximum

Environmental
Table 8. Environmental specifications
Operating temperature range
Storage temperature range
Humidity

0 to 50° C maximum-40 to 85 ° C maximum
0 to 90% non-condensing maximum

Mechanical
Table 9. Mechanical specifications
Dimensions

245 mm (L) x 146 mm (W) x 50 mm (H)Screw terminal connector type and pin-out
Table 10. Screw terminal connector specifications
Connector type
Wire gauge range

Detachable screw terminal
16 AWG to 30 AWG

Expansion port
The AI-EXP32 expansion port is intended to interface the AI-EXP32 to a USB-2416 series product. Do not use
any of the expansion port pins for any other purpose.

5AI-EXP32

Specifications

Table 11. AI-EXP32 37-pin connector pin out
Pin12345
67
8910
111213141516171819202122232425
26
2728
2930
31
32
33
34353637

Signal nameGND
NC
GND
NC
GND
VCC
NC
NC
IM_A2
IM_A1
IM_A0
IMEN10
IMEN9
IMEN8
IMEN7
DIO_LOAD2
DIO_LOAD1
NC
NC+3.3V_ISO
GND
+5 VA
+20.5V
GND-20.5VVDD_ISO
EXTDIO_INT
CM_A3
SM_A1
SM_AO
CM_A2
SCL
SDA
MOSI
SCK
NC
NC

Pin description
Analog groundNo connect
Analog groundNo connect
Analog ground+12 V power
No connect
No connect
I/O control signal
I/O control signal
I/O control signal
I/O control signal
I/O control signal
I/O control signal
I/O control signal
I/O control signal
I/O control signal
No connect
No connect+3.3 V power
Analog ground+5 V analog power+20.5 V power
Analog ground-20.5 V power+5 V digital power
I/O control signal
I/O control signal
I/O control signal
I/O control signal
I/O control signal
Serial I/O control signal
Serial I/O control signal
Serial I/O control signal
Serial I/O control signal
No connect
No connect

6AI-EXP32

Specifications

Table 12. 16-channel differential mode pin outPin1234567891011121314151617181920212223242526272829303132Signal name
CH16H
CH16L
CH17H
CH17L
CH18H
CH18L
CH19H
CH19L
CH20H
CH20L
CH21H
CH21L
CH22H
CH22L
CH23H
CH23L
GND
GND
+5VUSER
NC
DIO8
DIO9
DIO10
DIO11
DIO12
DIO13
DIO14
DIO15
DGND
DGNDNCNC

Pin description
Channel 16 HI
Channel 16 LO
Channel 17 HI
Channel 17 LO
Channel 18 HI
Channel 18 LO
Channel 19 HI
Channel 19 LO
Channel 20 HI
Channel 20 LO
Channel 21 HI
Channel 21 LO
Channel 22 HI
Channel 22 LO
Channel 23 HI
Channel 23 LO
Analog ground
Analog ground+5 V output
No connect
Digital input/output
Digital input/outputDigital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital ground
Digital groundNo connect
No connect

Pin3334353637383940414243444546474849505152
5354555657585960
61626364

Do not connect to terminal block pins labeled "NC."7Signal name
CH31L
CH31H
CH30L
CH30H
CH29L
CH29H
CH28L
CH28H
CH27L
CH27H
CH26L
CH26H
CH25L
CH25H
CH24L
CH24H
GND
GND
NC
NC
DIO23
DIO22
DIO21
DIO20
DIO19
DIO18
DIO17
DIO16
DGND
DGND
NCNC

Pin description
Channel 31 LO
Channel 31 HI
Channel 30 LO
Channel 30 HI
Channel 29 LO
Channel 29 HI
Channel 28 LO
Channel 28 HI
Channel 27 LO
Channel 27 HI
Channel 26 LO
Channel 26 HI
Channel 25 LO
Channel 25 HI
Channel 24 LO
Channel 24 HI
Analog ground
Analog groundNo connect
No connect
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital ground
Digital groundNo connect
No connect

AI-EXP32

Specifications

Table 13. 32-channel single-ended mode pin outPin1234567891011121314151617181920212223242526272829303132

Signal name
CH16H
CH16L
CH17H
CH17L
CH18H
CH18L
CH19H
CH19L
CH20H
CH20L
CH21H
CH21L
CH22H
CH22L
CH23H
CH23L
GND
GND
+5VUSER
NC
DIO8
DIO9
DIO10
DIO11
DIO12
DIO13
DIO14
DIO15
DGND
DGND
NC
NC

Pin description
Channel 16
Channel 48
Channel 17
Channel 49
Channel 18
Channel 50
Channel 19
Channel 51
Channel 20
Channel 52
Channel 21
Channel 53
Channel 22
Channel 54
Channel 23
Channel 55
Analog ground
Analog ground+5V outputNo connect
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital ground
Digital groundNo connect
No connect

Pin
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64

Do not connect to terminal block pins labeled "NC."8Signal name
CH31L
CH31H
CH30L
CH30H
CH29L
CH29H
CH28L
CH28H
CH27L
CH27H
CH26L
CH26H
CH25L
CH25H
CH24L
CH24H
GND
GND
NC
NC
DIO23
DIO22
DIO21
DIO20
DIO19
DIO18
DIO17
DIO16
DGND
DGND
NCNC

Pin description
Channel 63
Channel 31
Channel 62
Channel 30
Channel 61
Channel 29
Channel 60
Channel 28
Channel 59
Channel 27
Channel 58
Channel 26
Channel 57
Channel 25
Channel 56
Channel 24
Analog ground
Analog groundNo connect
No connect
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital ground
Digital groundNo connect
No connect

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E-mail: info@mccdaq.com
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AI-EXP32-spec.doc