Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Manufacturer | Analog Devices |
| Manufacturer Part Number | ADXL345BCCZ-RL7 |
| Manufacturer Status | PRODUCTION |
| Measurement Axes | 3 |
| Selectable Ranges | ±2 g / ±4 g / ±8 g / ±16 g |
| Resolution | Fixed 10-bit or full-resolution up to 13-bit at ±16 g |
| Full-Resolution Scale Factor | Approximately 4 mg/LSB across ranges |
| Digital Interfaces | I²C and 3-/4-wire SPI |
| Supply Voltage | 2.0 V to 3.6 V |
| I/O Voltage | 1.7 V to VS |
| Low-Power Operation | As low as 23 µA measurement and 0.1 µA standby at VS = 2.5 V, typical |
| FIFO | 32 levels |
| Motion Functions | Single tap, double tap, activity/inactivity, free fall |
| Interrupt Pins | 2, flexibly mapped |
| Package | 14-lead LGA, 5 × 3 × 1 mm |
| Packing | 1,500 units per reel for -RL7 |
| Operating Temperature | -40 °C to +85 °C |
| Shock Survival | 10,000 g |
Product Overview
The Analog Devices ADXL345BCCZ-RL7 is a three-axis digital MEMS accelerometer that measures static acceleration from gravity as well as dynamic acceleration from motion or shock. The device supports user-selectable ±2 g, ±4 g, ±8 g, and ±16 g ranges and provides either fixed 10-bit resolution or a full-resolution mode that reaches 13 bits at ±16 g while maintaining an approximately 4 mg/LSB scale factor.
The sensor communicates over I²C or 3-/4-wire SPI and includes a separate digital-I/O supply domain from 1.7 V to VS. It also integrates a 32-level FIFO and hardware motion functions for tap, double tap, activity/inactivity, and free-fall detection, with events mappable to either of two interrupt pins. The exact -RL7 orderable code is the 14-lead LGA device supplied on a 1,500-unit reel.
Key Features
- Three-axis acceleration measurement.
- User-selectable ±2 g, ±4 g, ±8 g, and ±16 g ranges.
- Fixed 10-bit or full-resolution operation up to 13 bits at ±16 g.
- Approximately 4 mg/LSB scale factor in full-resolution mode.
- I²C plus 3-wire and 4-wire SPI host interfaces.
- 2.0 V to 3.6 V sensor supply and 1.7 V to VS digital-I/O supply.
- As low as 23 µA measurement current and 0.1 µA standby current at VS = 2.5 V, typical.
- 32-level FIFO.
- Single-tap, double-tap, activity/inactivity, and free-fall detection.
- Two flexible interrupt outputs.
- -40 °C to +85 °C operating range.
- 10,000 g shock survival.
Technical Specifications
| Group | Parameter | Value |
|---|---|---|
| Measurement | Axes | X, Y, Z |
| Measurement | Ranges | ±2 g / ±4 g / ±8 g / ±16 g |
| Measurement | Resolution | Fixed 10-bit or full-resolution up to 13-bit |
| Measurement | Full-resolution scale factor | Approx. 4 mg/LSB |
| Data | Output format | 16-bit two’s-complement |
| Interface | I²C | Supported |
| Interface | SPI | 3-wire and 4-wire |
| Interface | Interrupt outputs | 2 |
| Buffering | FIFO | 32 levels |
| Motion | Tap | Single and double tap |
| Motion | Activity / inactivity | Supported |
| Motion | Free fall | Supported |
| Supply | VS | 2.0 V to 3.6 V |
| Supply | I/O voltage | 1.7 V to VS |
| Power | Measurement current | As low as 23 µA typical at VS = 2.5 V |
| Power | Standby current | 0.1 µA typical at VS = 2.5 V |
| Package | Type | 14-lead LGA (CC-14-1) |
| Package | Body | 5 × 3 × 1 mm |
| Packaging | -RL7 quantity | Reel, 1,500 |
| Operating | Temperature | -40 °C to +85 °C |
| Mechanical | Shock survival | 10,000 g |
Product Status
| Item | Information |
|---|---|
| Manufacturer Status | PRODUCTION |
Analog Devices currently lists the ADXL345 family as Production. The official ordering guide identifies ADXL345BCCZ-RL7 as the -40 °C to +85 °C 14-lead LGA variant supplied on a 1,500-unit reel.
Functional Highlights
Full-resolution mode preserves useful scale across wider g ranges
In full-resolution operation, the device increases output resolution as the selected range increases, reaching 13 bits at ±16 g while maintaining an approximately 4 mg/LSB scale factor. This is useful when one design must measure both relatively small acceleration changes and larger transient events without accepting the coarse scaling of a fixed 10-bit mode at the wider ranges.
Separate I/O supply eases low-voltage host interfacing
The sensor supply operates from 2.0 V to 3.6 V, while the digital-I/O domain can operate from 1.7 V to VS. This allows the digital interface to match a lower-voltage host logic rail when the overall power architecture satisfies the datasheet requirements.
FIFO and on-chip event detection reduce host polling
The 32-level FIFO can buffer acceleration samples, while tap, activity/inactivity, and free-fall functions can generate interrupts. This lets a host processor react to meaningful events or read samples in bursts instead of continuously polling every measurement.
Power consumption can be traded against bandwidth
Analog Devices states that power consumption scales automatically with bandwidth. Designs that do not require high update rates can therefore configure the sensor for lower-power operation while preserving the motion features needed by the application.
Applications / Application Fit
Analog Devices explicitly lists handsets, medical instrumentation, gaming and pointing devices, industrial instrumentation, personal navigation devices, and hard-disk-drive protection among ADXL345 applications.
Engineering-supported uses also include:
- tilt and inclination sensing using static gravity measurement;
- event-driven motion wake-up using activity/inactivity interrupts;
- tap-based user input;
- free-fall and impact detection;
- motion logging where FIFO buffering reduces host service frequency.
Application-specific safety, medical, aerospace, or other regulated qualification must be checked independently. The standard ADXL345BCCZ-RL7 ordering code should not be confused with the separate ADXL345-EP enhanced-product variant.
Why Choose This Part
ADXL345BCCZ-RL7 makes technical sense when a design needs a compact three-axis digital accelerometer with selectable range up to ±16 g, I²C or SPI connectivity, a separate low-voltage I/O domain, FIFO buffering, and hardware motion-event detection.
The part is especially relevant when host power and firmware load matter, because motion events and FIFO buffering can reduce continuous host interaction. A different sensor should be considered when the design requires a wider temperature grade, different accuracy/noise performance, a different package, or additional sensing axes such as gyroscope data.
Design Considerations
Resolution mode: Fixed 10-bit and full-resolution modes behave differently as the selected g range changes. Use the mode that matches the required scale factor and dynamic range.
Supply domains: VS and the I/O rail are separate design inputs. Confirm both rails and any required sequencing against the current datasheet before tying the sensor directly to a low-voltage host.
Bandwidth and power: Output data rate / bandwidth selection affects power consumption. Choose the lowest bandwidth that still satisfies the application’s response and aliasing requirements.
FIFO configuration: FIFO mode, watermark level, and interrupt mapping should be configured around the host’s service latency so samples are not unintentionally lost.
Mechanical placement: MEMS measurements are sensitive to board vibration, package stress, orientation, and mounting. The PCB coordinate system and device-axis orientation should be fixed explicitly in the mechanical design and firmware.
Package assembly: The 14-lead LGA requires the manufacturer’s recommended land pattern, stencil, and reflow process. The -RL7 suffix identifies packing quantity, not a different electrical silicon variant.
Related Engineering Resources
- Analog Devices ADXL345 product page — official status, features, applications, documentation, evaluation hardware, and software resources.
- Analog Devices ADXL345 datasheet — official electrical, mechanical, functional, and ordering information.
FAQ
What acceleration ranges are available?
The device supports ±2 g, ±4 g, ±8 g, and ±16 g ranges selected through the serial interface.
What does full-resolution mode do?
It increases resolution with the selected g range, reaching 13 bits at ±16 g while maintaining an approximately 4 mg/LSB scale factor.
Can it connect to a 1.8 V host?
The digital-I/O domain accepts 1.7 V to VS, so a 1.8 V logic rail is within the documented I/O range when the complete supply arrangement follows the datasheet requirements.
What is the FIFO depth?
The ADXL345 includes a 32-level FIFO.
What does the -RL7 suffix mean?
Analog Devices lists ADXL345BCCZ-RL7 as the 14-lead LGA device supplied on a 1,500-unit reel.
Is ADXL345BCCZ-RL7 the enhanced-product aerospace variant?
No. ADXL345-EP is a separate enhanced-product ordering family. The standard BCCZ-RL7 device is the -40 °C to +85 °C production variant.
Quality & Verification Support
Third-party inspection or testing can be arranged according to customer requirements. Testing fees are borne by the buyer. Additional verification requirements can be discussed before shipment. After an order is placed, physical product, label, packaging, and Date Code photos may be provided where appropriate.
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