



Overview
Das Accel 11 Click Board™ verfügt über einen ultra-energiesparenden dreiachsigen Beschleunigungssensor mit integrierter Intelligenz, der als BMA456 bezeichnet wird. Dieses Click Board™ ermöglicht lineare Bewegungs- und Gravitationskraftmessungen in Bereichen von ±2 g, ±4 g, ±8 und ±16 g in drei senkrechten Achsen.
Mit diesem intelligenten Sensor kann das Accel 11 Click Board™ viele verschiedene Ereignisse erkennen, darunter Tippen, Doppeltippen, Schrittzählen, Aktivitätserkennung (Gehen, Laufen, Stillstehen), Aktivitätsänderung (jede Art von Änderung des Beschleunigungsmusters), Ausrichtung und mehr. Es verfügt über eine integrierte Datenverarbeitung und bietet die Beschleunigungsdaten direkt über die Standard-I2C- oder SPI-Schnittstelle.
General Information | |
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Part Number (SKU) |
MIKROE-3440
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Manufacturer |
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Physical and Mechanical | |
Weight |
0.018 kg
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Other | |
Country of Origin |
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HS Code Customs Tariff code
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EAN |
8606018714872
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Warranty |
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With the total height of 1.10mm, the BMA456 is well suited for using it in wearable and handheld devices. Its powerful event detection engine is equipped with a set of features suitable for a wearable device, including step detection and count, walking activity recognition, tilt on wrist, tap/double tap detection, and any motion pattern detection. The sensor can use any of its two interrupt pins to report a detected event. Accel 11 click can be used for a rapid development and testing of various applications based on step counting, fitness applications, profile switching and display ON/OFF applications, angle measurement applications, and similar applications.
How Does The Accel 11 Click Board™ Work?
The Accel 11 Click Board™ is based on the BMA456, a digital triaxial acceleration sensor from Bosch Sensortech. This sensor has many features perfectly suited for wearables, handheld, and IoT applications, offering a good balance between the performance and the power consumption. One of its key features is its extremely low power consumption, which makes it perfectly suited for such applications. There are several power modes which the BMA456 device can use. While in Low Power mode, the device consumes the least power, but the access to some features is restricted. More information can be found within the BMA456 datasheet.
The BMA456 sensor can measure acceleration within ranges of ±2 g, ±4 g, ±8, and ±16 g. It can output the measurement data using the Output Data Rate (ODR) from 0.78Hz (Low Power mode), up to 1600Hz (Performance mode). A high-precision analog front end facilitates highly sensitive MEMS, featuring a 16-bit A/D Converter. It allows very high accuracy of the output, even during very low amplitude changes. This makes the sensor particularly sensitive and accurate with movements that generate relatively low acceleration signals. However, using a highly sensitive MEMS makes the BMA456 prone to damage caused by extremely high g-forces (10,000 g for less than 200 µs).
Acceleration data is available in 16-bit format from both the data registers and the internal FIFO buffer of 1kb. The FIFO buffer can be used for more complex calculations or timed readings, reducing the traffic on the communication interface. The interrupt engine facilitates the FIFO buffer, triggering an interrupt for two FIFO events: watermark event, and FIFO buffer full event. FIFO buffer allows optimization within the firmware that runs on the host MCU.
Besides the acceleration MEMS and complementary analog front-end circuit, the BMA456 sensor also has an integrated temperature sensor. It is updated every 1.2s and sampled to an 8-bit value (complement of 2's format).
Interrupts can be triggered for many different events. Some basic events include the data-ready interrupt event and aforementioned FIFO events, while so-called feature engines can trigger an interrupt for any of the detected motion/movement events, including step detection/counter, activity recognition, tilt on wrist, tap/double tap, any/no motion, and error event interrupt. The extensive interrupt engine can use two programmable interrupt pins. Both of these pins can be assigned with any interrupt source and can be either LOW or HIGH on interrupt, depending on settings in appropriate registers. These two pins are routed to INT and AN pin of the mikroBUS™, and are labeled as IT1 and IT2, respectively.
The Accel 11 Click Board™ offers two communication interfaces. It can be used with either I2C or SPI. The onboard SMD jumpers labeled as COMM SEL allow switching between the two interfaces. Note that all the jumpers have to be positioned either I2C or to SPI position. When I2C interface is selected, an additional SMD jumper labeled as ADDR SEL becomes available, determining the least significant bit of the BMA456 I2C address. The Click board™ should be interfaced only with MCUs that use logic levels of 3.3V.
SPECIFICATIONS
Type | Acceleration,Motion |
Applications | The Accel 11 Click Board™ can be used for a rapid development and testing of various applications based on step counting, fitness applications, profile switching and display ON/OFF applications, angle measurement applications, and similar applications. |
On-board modules | BMA456, a 16-bit triaxial acceleration sensor with ultra-low power consumption, from Bosch Sensortech. |
Key Features | Advanced interrupt engine allows detection of various events, ultra-low power consumption allows using in always-on wearable and handheld applications, thermal readings also available for increased reliability and accuracy. |
Interface | I2C,SPI |
Compatibility | mikroBUS |
Click board size | M (42.9 x 25.4 mm) |
Input Voltage | 3.3V |
PINOUT DIAGRAM
This table shows how the pinout on Accel 11 click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).
Notes | Pin | ![]() |
Pin | Notes | |||
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INT OUT 1 | IT1 | 1 | AN | PWM | 16 | NC | |
NC | 2 | RST | INT | 15 | IT2 | INT OUT 2 | |
SPI Chip Select | CS | 3 | CS | RX | 14 | NC | |
SPI Clock | SCK | 4 | SCK | TX | 13 | NC | |
SPI Data OUT | SDO | 5 | MISO | SCL | 12 | SCL | I2C Clock |
SPI Data IN | SDI | 6 | MOSI | SDA | 11 | SDA | I2C Data |
Power Supply | 3.3V | 7 | 3.3V | 5V | 10 | NC | |
Ground | GND | 8 | GND | GND | 9 | GND | Ground |
ACCEL 11 CLICK ELECTRICAL SPECIFICATIONS
Description | Min | Typ | Max | Unit |
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Acceleration measurement range | ±2 | - | ±16 | g |
Output refresh rate | 0.78 | - | 1600 | Hz |
Sensitivity (±2g range to ±16g range) | 2048 | - | 16384 | LSB/g |
Thermal measurement range | -40 | - | +85 | ˚C |
ONBOARD SETTINGS AND INDICATORS
Label | Name | Default | Description |
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LD1 | PWR | - | Power LED indicator |
JP1-JP4 | COMM SEL | Right | Communication interface selection: right position I2C, left position SPI |
JP5 | ADDR SEL | Left | I2C address LSB selection: left position 0, right position 1 |
Frequently Asked Questions
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