BTH-1208LS and BTH-1208LS-OEM
BTH-1208LS
Wireless Multifunction DAQ Device
Features
• Eight 11-bit single-ended (SE) or
four 12-bit differential (DIFF) analog
input channels
• Acquires data over Bluetooth® or
USB connection
• Maximum sample rate of 1 kS/s over
Bluetooth (hardware paced)
• Maximum sample rate of 47 kS/s over USB (hardware paced)
or Bluetooth (BURSTIO)
• Software-selectable analog input
ranges of ±10 V (SE); ±20 V, ±10 V,
±5 V, ±4 V, ±2.5 V, ±2.0 V, ±1.25 V,
and ±1.0 V (DIFF).
• Two 12-bit analog outputs
• Eight individually-configurable
digital I/O lines
• One 32-bit event counter
• One external digital trigger input
• One external clock input
• Battery and USB power options
• Battery recharging capability
• BTH-1208LS-OEM comes as boardonly device with header connectors
• ACC-205 DIN-rail kit available separately
Software
Supported Operating Systems
• Windows 8/7/Vista®/XP 32/64-bit
−− Universal library (UL), ULx for NI
LabVIEW™
• Android™
−− UL for Android
Ready-to-Run Applications
• InstaCal™ (install, configure, and
test)
• DAQami™* Advanced Data Logging
Application (acquire, view, and log)
• TracerDAQ® (acquire, view, log, and
generate)
Supported Programming Environments
• Visual Studio® and Visual Studio
.NET, including examples for Visual
C++®, Visual C#®, Visual Basic®,
and Visual Basic .NET, and other
IDEs
• Java® (Android only) including
examples and demo apps
• LabVIEW (Windows only)
• DASYLab®
* Supported in USB mode only
Measurement Computing
The BTH-1208LS provides wireless data acquisition up to 1 kS/s and can be hosted by either
a Windows-based PC or Android-based device.
Supported Windows Bluetooth Stack
Protocols
−− Microsoft® Bluetooth stack
−− Broadcom® Bluetooth stack (not
supported by Windows XP)
Overview
Finally, Bluetooth communication
in a multifunction DAQ device! The
BTH-1208LS offers short-range wireless
data acquisition to a compatible host
device – whether a Windows-based PC
or an Android-based tablet, phone, or
mini-PC.
The BTH-1208LS offers analog I/O, digital I/O, and counter input over both a
Bluetooth or USB connection.
Two Operation Modes
The BTH-1208LS can operate wirelessly
as a Bluetooth device or as a physicallyconnected USB device.
Analog Input
The BTH-1208LS provides up to eight
11-bit SE analog inputs or four 12-bit
DIFF analog inputs.
The device offers a fixed ±10 V range for
SE measurements, and ±20 V, ±10 V, ±5
V, ±4 V, ±2.5 V, ±2.0 V, ±1.25 V, and ±1.0
V ranges for DIFF measurements.
Users can start a hardware-paced scan
with either a software command or with
an external hardware trigger event.
When continuously scanning as a
Bluetooth device, the BTH-1208LS supports a maximum aggregate scan rate of
1024 S/s. The total acquisition rate for
all channels cannot exceed 1024 S/s.
The following table lists the per-channel
sample rates when continuously scanning from one to eight channels in
Bluetooth mode.
When operating as a Bluetooth device,
the BTH-1208LS must be paired with
the host device before it can wirelessly
communicate acquired data. Pairing is
a one-time procedure that establishes a
bond with the host device.
The BTH-1208LS can transmit data up
to 10 meters when operating as a
Bluetooth device.
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BTH-1208LS
General Information
BTH-1208LS Block Diagram
Bluetooth
Module
Batteries
1.8 V
to
5.5 V
USB
Charger
Analog Output
2 Channels
2
Microcontroller
Control
Analog Input
8 Single-Ended
Channels (11-bit)
or
4 Differential
Channels (12-bit)
8
Power Supplies
with
Shutdown and Soft-Start
3.3 V
8
Digital I/O
Event Counter
1 Channel
(32-bit)
1
Trigger Input
Clock Input
The following table lists the per-channel sample rates (hardware paced) for one to eight channels in USB mode.
Maximum Per Channel Sample Rates (Bluetooth
Mode)
# Channels Scanned
Sample Rate
1
1024 S/s
2
512 S/s
3
341.33 S/s
4
256 S/s
5
204.8 S/s
6
170.67 S/s
7
146.28 S/s
8
128 S/s
Maximum Per Channel Sample Rates (USB Mode)
# Channels Scanned
When operating in BURSTIO mode as a Bluetooth device, the
BTH-1208LS can acquire data at a maximum aggregate rate of
47 kS/s. Burst scans are limited to the depth of the onboard
memory, as the data is acquired at a rate faster than it can be
transferred to the computer. When using Bluetooth, the transfer rate for the acquired data to the host is still limited. Allow
time between scans for the acquisition and the transfer of the
data.
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47
2
23.5
3
15.67
4
11.75
5
9.40
6
7.83
7
6.70
8
5.88
Channel-Gain Queue
The channel-gain queue feature lets you configure a list of
channels and gains for each scan. Each channel can have a different gain setting. The gain settings are stored in a channelgain queue list that is written to local memory on the device.
The channel-gain queue list can contain up to 8 elements in
SE mode or four elements in DIFF mode. The elements must
be unique and listed in ascending order.
When operating as a USB device, the device supports a maximum aggregate scan rate of 47 kS/s. The total acquisition rate
for all channels cannot exceed 47 kS/s.
Measurement Computing
Sample Rate
2
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BTH-1208LS
Software Information & Specifications
BTH-1208LS-OEM Block Diagram
Analog Output
2 Channels
2
J1
8
Analog Input
8 Single-Ended Channels (11-bit)
or
4 Differential Channels (12-bit)
Bluetooth
Module
USB
Microcontroller
8
J2
1
Digital I/O
Event Counter
1 Channel
(32-bit)
Trigger Input
Clock Input
Charger
Control
3.3 V
Power Supplies
with Shutdown and Soft-Start
1.8 V
to
5.5 V
Trigger Input
Inputs are pulled high by default to 3.3 V through 47.5 kΩ
resistors on the circuit board. The pull-up voltage is common
to all 47.5 kΩ resistors.
The BTH-1208LS external digital trigger input can be configured for either rising/falling edge, or high/low level.
Event Counter Input
External Clock Input
The BTH-1208LS has a 32-bit event counter that can accept
frequency inputs up to 1 MHz. The internal counter increments when the TTL levels transition from low to high.
An external clock signal connection is provided to pace input
scanning operations.
Analog Output
Power Options
The BTH-1208LS includes two 12-bit analog outputs, each
with an output range of 0 V to 2.5 V. The D/A is software
paced, and throughput is system-dependent.
When connected to a USB power supply, BTH-1208LS receives
5 V power. USB provides both power and communication
when the device is connected to a host USB port.
If rechargeable NiMH or NiCd batteries are installed, the batteries recharge when the device is connected to a USB host or
USB power supply.
Digital I/O
The BTH-1208LS supports up to eight digital I/O lines. When
configured for input, the digital terminals can detect the state
of any TTL-level input.
Calibration
Digital input voltage ranges of up to 0 V to 5.5 V are permitted, with thresholds of 0.8 V (low) and 2.0 V (high).
BTH-1208LS devices are factory-calibrated. Specifications are
guaranteed for one year. For calibration beyond one year,
return the device to the factory for recalibration.
Each DIO channel is an open-drain output which can sink up
to 50 mA for direct drive applications when used as an output.
Measurement Computing
J3
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BTH-1208LS
General Information & Specifications
BTH-1208LS-OEM Also Available
The BTH-1208LS-OEM has the same fundamental specifications as the BTH-1208LS, but comes in a board-only form
factor with header connectors instead of screw terminals.
Connectors for user-supplied power included instead of a
battery compartment. The board can be powered by an
external 5 V supply or a USB power supply in Bluetooth mode,
or by the USB host device in USB mode.
Software Support
BTH-1208LS devices are supported by the software in the table below.
Ready-to-Run Applications
InstaCal
An interactive utility that configures and tests MCC hardware. Windows® OS
InstaCal is included with the free MCC DAQ Software bundle (CD/download).
DAQami
(USB mode only)
Advanced data logging application with drag-and-drop software interface that is used
to acquire, view, and log data. DAQami can be configured to log analog channels
and to view that data in real-time or post-acquisition on user-configurable displays.
Windows OS
DAQami is available as a purchased software download.
TracerDAQ and
TracerDAQ Pro
A virtual strip chart, oscilloscope, function generator, and rate generator applications
used to generate, acquire, analyze, display, and export data. The Pro version provides
enhanced features. Windows OS
TracerDAQ is included with the free MCC DAQ Software bundle (CD/download).
TracerDAQ Pro is available as a purchased software download.
General-Purpose Programming Support
Universal Library
(UL)
Programming library of function calls for C, C++, VB, C# .Net, and VB .Net using
Visual Studio and other IDEs. Windows OS
The UL is included with the free MCC DAQ Software bundle (CD/download).
UL for Android
Programming library of function calls for Java programmers who develop apps for
Android-based tablets and phones. UL for Android communicates with select MCC
DAQ devices. Supports Android project development on Windows, Linux, Mac OS X
UL for Android is included with the free MCC DAQ Software bundle (CD/download).
Application-Specific Programming Support
ULx for
NI LabVIEW
A comprehensive library of VIs and example programs for NI LabVIEW that is used to
develop custom applications that interact with most MCC devices. Windows OS
ULx is included with the free MCC DAQ Software bundle (CD/download).
DASYLab Driver
Icon-based data acquisition, graphics, control, and analysis software that allows users
to create complex applications in minimal time without text-based programming.
DASYLab is available as a purchased software download. Windows OS
Measurement Computing
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BTH-1208LS
Specifications
Specifications
Analog Input Accuracy Components
All specifications are subject to change without notice.
Typical for 25°C unless otherwise specified.
Differential Mode (All Values are (±)
Range
Analog Input
A/D Converter Type: Successive approximation type
Input Voltage Range for Linear Operation (CHx to GND)
Single-Ended Mode: ±10 V max
Differential Mode: –10 V min, 20 V max
Absolute Maximum Input Voltage (CHx to GND): ±25 V max
Input Impedance: 140 kΩ
Input Current
Vin = 10 V: 70 µA typ
Vin = 0 V: –12 µA typ
Vin = –10 V: –94 µA typ
Input current is a function of applied voltage on the analog input channels. For
a given input voltage, Vin, the input leakage is approximately equal to
(8.181 * Vin – 12) µA.
Number of Channels: 8 single-ended or 4 differential; software-selectable
Input Ranges (Software-Selectable)
Single-Ended: ±10 V, G=2
Differential: ±20 V, G=1; ±10 V, G=2; ±5 V, G=4; ±4 V, G=5; ±2.5 V, G=8;
±2.0 V, G=10; ±1.25 V, G=16; ±1.0 V,G=20;
Throughput
Maximum throughput when scanning is system-dependent
Software Paced
10 S/s typ, system-dependent (Bluetooth)
250 S/s typ, system-dependent (USB)
Hardware Paced
0.014 S/s to 1024 S/s (Bluetooth)
0.014 S/s to 47 kS/s (USB)
BURSTIO: 0.014 S/s to 47 kS/s to 12K (12,288) sample FIFO. Transfer rate to
host is limited to 1024 S/s (Bluetooth)
Channel Gain Queue (Software-Selectable): 8 elements in SE mode, 4 elements
in DIFF mode. One gain element per channel. Elements must be unique and
listed in ascending order.
Resolution Differential: 12 bits, no missing codes
Single-Ended: 11 bits (The AD7870 converter only returns 11 bits [0 to 2,047
codes] in single-ended mode)
Integral Linearity Error: ±1 LSB typ
Differential Linearity Error: ±0.5 LSB typ
Repeatability: ±1 LSB typ
Trigger Source (Software-Selectable): External digital (TRIG)
Pacer Source (Software-Selectable)
Internal
External (AICKI), rising edge triggered
% of
Reading
Gain Error at
Full Scale
Offset
Accuracy at
Full Scale
±20 V
0.2
40 mV
9.766 mV
49.766 mV
±10 V
0.2
20 mV
9.766 mV
29.766 mV
±5 V
0.2
10 mV
9.766 mV
19.766 mV
±4 V
0.2
8 mV
9.766 mV
17.766 mV
±2.5 V
0.2
5 mV
9.766 mV
14.766 mV
±2 V
0.2
4 mV
9.766 mV
13.766 mV
±1.25 V
0.2
2.5 mV
9.766 mV
12.266 mV
0.2
2 mV
9.766 mV
11.766 mV
±1 V
Single-Ended Mode (All Values are (±)
±10 V
0.2
20
19.531
39.531
Noise Performance
Differential Mode
Range
Typical
Counts
LSBrms
±20 V
3
0.45
±10 V
3
0.45
±5 V
3
0.45
±4 V
4
0.61
±2.5 V
5
0.76
±2 V
7
1.06
±1.25 V
10
1.52
±1 V
12
1.82
6
0.91
Single-Ended Mode
±10 V
Analog Input Accuracy
Analog Output
±20 V
5.1
±10 V
6.1
±5 V
8.1
±4 V
9.1
±2.5 V
12.1
±2 V
14.1
±1.25 V
20.1
Resolution: 12-bits, 1 in 4,096
Output Range: 0 V to 2.5 V
Number of Channels: 2
Throughput (Software Paced): 10 S/s single channel typ, system-dependent
Zero-scale offsets may result in a fixed zero-scale error producing a dead-band
digital input code region. In this case, changes in digital input code at values
less than 0x040 may not produce a corresponding change in the output voltage. The offset error is tested and specified at code 0x040.
Power On and Reset Voltage
USB Operation: Initializes to 000h code
Bluetooth Operation: The outputs can be individually configured to initialize to 000h or to have user-configurable values written to the outputs when
the Bluetooth host device is connected or disconnected.
Output Current Drive (Each D/A OUT): 5 mA source capability
Slew Rate: 0.75 V/ µs typ
±1 V
24.1
Analog Output Accuracy
Differential Mode
Range
Accuracy (LSB)
All values are (±) accuracy tested at no load
Range: 0 V to 2.5 V
Accuracy (LSB): 8.0 typ, 73.0 max
Single-Ended Mode
±10 V
Measurement Computing
4.0
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BTH-1208LS
Specifications
Analog Output Accuracy Components
All values are (±)
Range: 0 V to 2.5 V
% of Reading: 0.16 typ, 1.44 max
Gain Error at Full Scale: 4.0 mV typ, 36.0 mV max
Offset: 1.0 mV typ, 9.0 mV max
Zero-scale offsets may result in a fixed zero-scale
error producing a dead-band digital input code
region. In this case, changes in digital input code
at values less than 0x040 may not produce a corresponding change in the output voltage. The
offset error is tested and specified at code 0x040.
Accuracy at Full Scale: 5.0 mV typ, 45.0 mV max
Digital Input/Output
Digital Type: 3.3 V open drain
Output Value Mapping:
0 Written: Output drives to DGND
1 Written: Output is pulled up to 3.3 V by internal resistor
Number of I/O: 8
Configuration: Individually configurable
Input Voltage Range: 0 V to 5.5 V
Each transistor source pin is internally connected to DGND
Pull Up/Pull-Down Configuration:47.5 kΩ pull-up
resistors (to 3.3 V), 2.2 kΩ series resistors
Input High Voltage Threshold: 2.0 V min
Input High Voltage Limit: 5.5 V absolute max
Input Low Voltage Threshold: 0.8 V max
Input Low Voltage Limit: –0.5 V absolute min,
0 V recommended min
Output Voltage Range: 0 V to 3.3 V (no external
pull up resistor), 0 V to 5.5 V max
The external pull-up is connected to the digital
output bit through an external pull-up resistor.
Adding an external pull-up resistor connects it in
parallel with the internal 47.5 kΩ 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.
Output Off State Leakage Current: 1.0 µA typ
Does not include the additional leakage current
contribution through the internal or any external
pull-up resistor.
Sink Current Capability: 50 mA max (continuous)
per pin
Transistor On Resistance: 0.7 Ω max
Power On and Reset State
USB Operation: All input
Bluetooth Operation: The digital I/O can either
be all input at power on / reset or may be configured to have user-configurable patterns written to
the DIO when the Bluetooth host is connected or
disconnected. Each transistor source pin is internally connected to DGND.
External Trigger
Power
Trigger Source: External digital; TRIG terminal
Trigger Mode: Software configurable for edge or
level sensitive, rising or falling edge, high or low
level.
Trigger Latency: 10 µs max
Trigger Pulse width: 1 µs min
Input Type: Schmitt trigger, 47 kΩ pull-down to
ground
Schmitt Trigger Hysteresis: 0.76 V typ, 0.4 V min,
1.2 V max
Input High Voltage Threshold:1.74 V typ,
1.3 V min, 2.2 V max
Input High Voltage Limit: 5.5 V absolute max
Input Low Voltage Threshold: 0.98 V typ,
0.6 V min, 1.5 V max
Input Low Voltage Limit: –0.5 V absolute min, 0 V
recommended min
Supply Current, USB Source
During Enumeration: < 100 mA
After USB Enumeration or Connected to USB
Charger/Supply: < 500 mA
Battery Power: Two AA cells; alkaline, NiCd, and
NiMH cells supported
Battery Charging: NiMH and NiCd charging supported. Alkaline cells automatically detected and
not charged.
When operating from batteries, there is a user
configurable power-off timer that will turn the
device off when there is no host connection for
the specified amount of time. The timer can be
disabled or set to a value from 1 – 255 minutes.
+VO Power Available (After USB Enumeration or
Bluetooth Connection):
3.3 V nominal
+VO Output Current (After USB Enumeration or
Bluetooth Connection: 50 mA max
External Clock Input
Terminal Name: AICKI
Terminal Type: Input
Input Clock Rate: 50 kHz, max
Clock Pulse Width: 1 µs min
Input Type: Schmitt trigger, 47 kΩ pull-down to
ground
Schmitt Trigger Hysteresis: 0.76 V typ
0.4 V min
1.2 V max
Input High Voltage Threshold: 1.74 V typ
1.3 V min
2.2 V max
Input High Voltage Limit: 5.5 V absolute max
Input Low Voltage Threshold: 0.98 V typ,
0.6 V min, 1.5 V max
Input Low Voltage Limit: –0.5 V absolute min,
0 V recommended min
Counter
Pin Name: CTR
Counter Type: Event counter
Number of Channels: 1
Input Type: Schmitt trigger, 47 kΩ pull-down to
ground, rising edge triggered
Input Source: CTR screw terminal
Resolution: 32 bits
Maximum input frequency: 1 MHz
High Pulse Width: 500 ns min
Low Pulse Width: 500 ns min
Schmitt Trigger Hysteresis: 0.76 V typ, 0.4 V min,
1.2 V max
Input High Voltage Threshold: 1.74 V typ,
1.3 V min, 2.2 V max
Input High Voltage Limit: 5.5 V absolute max
Input Low Voltage Threshold: 0.98 V typ,
0.6 V min, 1.5 V max
Input Low Voltage Limit: –0.5 V absolute min,
0 V recommended min
Bluetooth
The Bluetooth radio is disabled when the device is
connected to a USB host.
Device Type: Bluetooth 2.1
Device Compatibility: Backwards compatible with
Bluetooth 2.0, 1.2, and 1.1
Bluetooth Profile: Serial Port Profile (SPP)
Radio Range: Class II, 10 m typ
USB
Device Type: USB 2.0 full speed
Device Compatibility: USB 1.1, USB 2.0
Environmental
Operating Temperature Range: 0 °C to 50 °C (32
°F to 122 °F)
Storage Temperature Range: –40 °C to 70 °C (–40
°F to 158 °F)
Humidity: 0% to 90% non-condensing
Mechanical
Dimensions (L × W × H)
BTH-1208LS: 146.56 × 81.31 × 27.18 mm (5.77 ×
3.28 × 1.07 in.)
BTH-1208LS-OEM (PCB Dimensions): 99.06 ×
68.58 × 14.61 mm
(3.90 × 2.70 × 0.58 in.)
USB Cable Length: 3 m (9.84 ft) max
User Connection Length: 3 m (9.84 ft) max
Signal Connector
Connector Type
BTH-1208LS: Screw terminal
BTH-1208LS-OEM: Three 2 × 8 pin, 0.1 in. pitch
headers
Wire Gauge Range: 16 AWG to 30 AWG
Memory
FIFO: 12K (12,288) samples
Non-Volatile EEPROM: 2,048 bytes (768 bytes calibration, 256 bytes user,
1,024 bytes firmware use)
Microcontroller
Type: High performance 16-bit RISC microcontroller
Measurement Computing
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BTH-1208LS
Ordering
Ordering Information
Part No.
Description
BTH-1208LS
Wireless DAQ device with 8 SE/4 DIFF analog inputs,
1 kS/s throughput in Bluetooth mode; 2 analog outputs;
8 digital I/O lines; and one 32-bit counter input channel
BTH-1208LS-OEM
Board-only wireless DAQ device with 8 SE/4 DIFF analog
inputs, 1 kS/s throughput in Bluetooth mode; 2 analog
outputs; 8 digital I/O lines; and one 32-bit counter input
channel
Accessories
ACC-205
DIN-rail kit for BTH-1208LS
Software
DAQami*
Easy-to-use advanced data logging software to acquire,
view, and log data
TracerDAQ Pro
Out-of-the-box virtual instrument suite with strip chart,
oscilloscope, function generator, and rate generator –
professional version
DASYLab
Icon-based data acquisition, graphics, control, and
analysis software
* Supported in USB mode only
Measurement Computing
BTH-1208LS-data.indd
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Document Revision 4, August, 2014
© Copyright 2014, Measurement Computing Corporation
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