BTH-1208LS
Wireless Multifunction DAQ Device
Features• Eight single-ended (SE) or
four differential (DIFF) analog
inputs• Maximum Bluetooth® sample
rates of 47 kS/s (BURSTIO) or
1 kS/s (hardware paced) overBluetooth• Maximum USB sample rates of
47 kS/s (hardware paced)• Two 12-bit analog outputs• Eight digital I/O and one 32-bit
counter input• Battery and USB power options

Supported Operating Systems
The BTH-1208LS acquires wireless data acquisition at rates up to 1 kS/s and can be hosted
by either a Windows-based or Android-based device.

Overview
The BTH-1208LS offers Bluetooth communication in a multifunction DAQ device.
When paired with a compatible Windows-based or Android-based host device, theBTH-1208LS offers short-range wireless communication of acquired data.
The BTH-1208LS offers analog I/O, digital I/O, and event counter input over either
a wireless Bluetooth or physical USB connection.

Bluetooth or USB
Operation
The BTH-1208LS can operate wirelessly
as a Bluetooth device or as a physicallyconnected USB device.
When operating as a Bluetooth device,
the BTH-1208LS must be paired withthe host device before it can wirelessly
communicate acquired data. Pairing isa one-time procedure that establishes abond with the host device.
The BTH-1208LS can transmit data
up to 10 meters when operating as aBluetooth device.

When performing a hardware-paced scan
as a Bluetooth device, the BTH-1208LS
supports a maximum aggregate sample
rate of 1024 S/s. The total rate for all
channels cannot exceed 1024 S/s.

• Android™
When operating in BURSTIO mode as aBluetooth device, the BTH-1208LS canacquire data at a maximum aggregate rateof 47 kS/s. BURSTIO scans are limited tothe depth of the onboard memory, as thedata is acquired at a rate faster than it canbe transferred to the computer.
When operating as a USB device, thedevice supports a maximum aggregate
scan rate of 47 kS/s. The total acquisition
rate for all channels cannot exceed 47 kS/s.

The following table lists the per-channel
sample rates (hardware paced) for one toeight channels in Bluetooth mode.

The following table lists the per-channel
sample rates (hardware paced) for one toeight channels in USB mode.

Maximum Per Channel Sample Rates(Bluetooth Mode – Hardware Paced))

Maximum Per Channel Sample Rates(USB Mode – Hardware Paced)# of Channels in
Acquisition

Maximum Sample
Rate# of Channels in
Acquisition

11024 S/s

1

47 kS/s

2

512 S/s2

23.5 kS/s

3

341.33 S/s

315.67 kS/s

4

256 S/s

411.75 kS/s

5

204.8 S/s

59.40 kS/s

6

170.67 S/s

6

7.83 kS/s

7

146.28 S/s

76.70 kS/s

128 S/s

85.88 kS/s

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.

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Overview
Power Options

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 channel-gain queue
list that is written to local memory on the device. The channelgain 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 connected to a USB power supply, BTH-1208LS receives
5 V power. When the device is connected to a host USB port,
USB provides both power and communication.
If rechargeable NiMH or NiCd batteries are installed, the batteries recharge when the device is connected to a USB host or
USB power supply.

Calibration

Trigger Input

The BTH-1208LS is factory-calibrated using a NIST-traceablecalibration process. Specifications are guaranteed for one year.
For calibration beyond one year, return the device to the factoryfor recalibration.

The BTH-1208LS external digital trigger input can be configured
for either rising/falling edge, or high/low level.

External Clock Input

BTH-1208LS-OEM Version

An external clock signal connection is provided to pace input
scanning operations.

The BTH-1208LS-OEM has a board-only form factor with header
connectors for OEM and embedded applications (no case, CD, or
network cable included). All devices can be further customized
to meet customer needs.

Analog Output
The BTH-1208LS includes two 12-bit analog outputs, each withan output range of 0 V to 2.5 V. The D/A is software paced, andthroughput is system-dependent.

Digital I/O
The BTH-1208LS supports up to eight digital I/O lines. Whenconfigured for input, the digital terminals can detect the stateof any TTL-level input.
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).
Each DIO channel is an open-drain output which can sink up
to 50 mA for direct drive applications when used as an output.

The BTH-1208LS-OEM has the same specifications as the standard
device, but in a board-only form factor with header connectors insteadof screw terminals. In Bluetooth mode, power options from an external
5 V supply or a USB power supply are available.

Inputs are pulled high by default to 3.3 V through 47.5 kΩresistors on the circuit board. The pull-up voltage is common
to all 47.5 kΩ resistors.

Counter 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.

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Software
Software Support
The BTH-1208LS is supported by the software in the table below.
Ready-to-Run Applications

DAQami™

Data acquisition companion software with drag-and-drop interface that is used to acquire,view, and log data, and generate signals. DAQami can be configured to log analog, digital, andcounter channels, and to view that data in real-time or post-acquisition on user-configurable
displays. Logged data can be exported for use in Excel® or MATLAB®. Windows OS
DAQami is included with the free MCC DAQ Software bundle.

InstaCal™

TracerDAQ® andTracerDAQ Pro

An interactive installation, configuration, and test utility for MCC hardware. Windows OS
InstaCal is included with the free MCC DAQ Software bundle (CD/download).
Virtual strip chart, oscilloscope, function generator, and rate generator applications used togenerate, acquire, analyze, display, and export data. Supported features may vary by hardware.
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)

UL for Android™

Library for developing applications in C, C++, VB, C# .Net, VB .Net, and Python.
Windows OS
The UL is included with the free MCC DAQ Software bundle (CD/download).
Programming library of Java classes for 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 forNI LabVIEW™

DASYLab®

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 for NI LabVIEW is included with the free MCC DAQ Software bundle (CD/download).

Icon-based data acquisition, graphics, control, and analysis software that allows users to create
complex applications in minimal time without text-based programming. Windows OS
DASYLab is available as a purchased software download.

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BTH-1208LS
Specifications
BTH-1208LS Block Diagram

Bluetooth
ModuleBatteries
1.8 V
to
5.5 V

USB

Charger28Analog Output
2 Channels

Microcontroller

Analog Input
8 Single-Ended
Channels (11-bit)or
4 Differential
Channels (12-bit)

ControlPower Supplies
with
Shutdown and Soft-Start
Digital I/O
Event Counter
1 Channel(32-bit)

3.3 V

8

1

Trigger Input
Clock Input

Specifications

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 tohost 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 andlisted 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

All specifications are subject to change without notice.
Typical for 25°C unless otherwise specified.

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;

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Specifications
Analog Output

Analog Input Accuracy
Differential Mode

±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-banddigital 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 theBluetooth 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

Range

Accuracy (LSB)

±20 V

5.1

±10 V

6.1

±5 V

8.1

±4 V

9.1

±2.5 V

12.1

All values are (±) accuracy tested at no loadRange: 0 V to 2.5 V
Accuracy (LSB): 8.0 typ, 73.0 max

Single-Ended Mode
±10 V

4.0

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-banddigital 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

Analog Input Accuracy Components
Differential Mode (All Values are (±)

Range

% of
ReadingGain Errorat
Full Scale

OffsetAccuracyatFull 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

±1 V

0.2

2 mV

9.766 mV

11.766 mV

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 kΩseries 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 theinternal 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 / resetor 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.

Single-Ended Mode (All Values are (±)
±10 V

0.2

20

19.53139.531

Noise Performance
Differential Mode

Range

TypicalCounts

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

12

1.82

±1 V

Single-Ended Mode
±10 V

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BTH-1208LS
Ordering
External Trigger

Environmental

Trigger source: External digital; TRIG terminal
Trigger mode: Software configurable for edge or level sensitive, rising or fallingedge, 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

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

External Clock Input

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

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

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

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

Accessories and Cables
Part No.

Description

ACC-205

DIN-rail kit; compatible with the BTH-1208LS standard
device.

Software also Available from MCC

MemoryFIFO: 12K (12,288) samples
Non-volatile EEPROM: 2,048 bytes (768 bytes calibration, 256 bytes user,
1,024 bytes firmware use)

Microcontroller

Part No.

Description

TracerDAQ Pro

Out-of-the-box virtual instrument suite with strip chart,
oscilloscope, function generator, and rate generator –professional version

DASYLabIcon-based data acquisition, graphics, control, andanalysis software

Type: High performance 16-bit RISC microcontroller

Power

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

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

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