STMicroelectronics LIS302SG

Overview

LIS302SG from STMicroelectronics is a 3-axis ±2g analog-output MEMS accelerometer in the "piccolo" family, designed for motion sensing in space-constrained embedded systems. It delivers ratiometric analog outputs per axis (Voutx/Vouty/Voutz), supports multiplexed single-pin output via S0/S1 control, operates from 3.0–3.6 V, consumes 0.65 mA in active mode, and features embedded self-test and power-down mode. It is used in mobile terminal free-fall detection and gaming input devices.

For engineers reviewing the LIS302SG datasheet, LIS302SG pinout, LIS302SG application, or LIS302SG equivalent, key selection considerations include its ±2 g full-scale range, 32 kΩ output impedance with external RC filtering, -40 °C to +85 °C operating temperature, LGA-14 package footprint, and ratiometric zero-g level (Vdd/2 ±6%) enabling supply-independent ADC interfacing.

Technical Context

The LIS302SG integrates a surface-micromachined capacitive sensing element with a CMOS interface IC featuring correlated double sampling (CDS) to suppress offset and 1/f noise. Each axis uses a dedicated sample-and-hold (S/H) circuit before analog output buffering.

Its analog outputs are ratiometric to Vdd: sensitivity is 0.145×Vdd ±5% V/g and zero-g level is Vdd/2 ±6% V - both scale linearly with supply voltage. The embedded 3:1 analog multiplexer selects Voutx/Vouty/Voutz or Aux_in onto the Vout pin using S0/S1 logic inputs, enabling single-channel ADC acquisition without external switching.

Key Specifications

Pinout & Package

Package: LGA-14 (3 mm × 5 mm × 0.9 mm thin land grid array), RoHS-compliant ECOPACK®.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 3-axis analog-output accelerometer applications.

Compared with ADXL322 and MMA7260QT, the LIS302SG uniquely combines ratiometric outputs, integrated 3:1 analog multiplexing, and electrostatic self-test in an LGA-14 package - making it optimal for compact, diagnostics-aware consumer and industrial motion systems requiring minimal external components.

Availability

LIS302SG is available at Aetrix Electronics and suitable for mobile terminal free-fall detection, gaming input devices, appliance inertial monitoring, and robotics joint orientation sensing requiring stable component supply and long-term industrial availability.

Supply support for LIS302SG includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in MEMS sensors, microcontrollers, power management, and automotive ICs.

The LIS302SG belongs to ST's "piccolo" family of miniaturized, low-power analog accelerometers - engineered specifically for space-constrained portable and industrial motion-sensing applications demanding high shock survivability and factory-calibrated performance.

FAQ

What is the recommended external capacitor value for 100 Hz bandwidth on Voutx?

For a 100 Hz cutoff frequency, use a 50 nF capacitor on Voutx. This follows from the device's 32 kΩ output impedance and the formula ft = 1/(2π × Rout × Cload). The datasheet specifies a minimum Cload of 2.5 nF, and 50 nF falls within the validated range shown in Table 6. Ensure capacitor placement is near the pin to minimize parasitic inductance.

How does the LIS302SG's ratiometric output benefit ADC interfacing?

The LIS302SG's ratiometric design means both zero-g level (Vdd/2) and sensitivity (0.145×Vdd) scale linearly with supply voltage. When using the same Vdd as the ADC reference, supply ripple or drift cancels out in the digitized result - eliminating a major source of measurement error without requiring precision voltage references or post-processing compensation.

Can the LIS302SG operate from a 2.8 V supply?

No. The absolute minimum supply voltage is 3.0 V per Table 4, and operation below this risks undefined behavior or failure to meet specifications. The device is factory calibrated at 3.3 V, and its ratiometric parameters assume Vdd ≥ 3.0 V. Using 2.8 V violates the Absolute Maximum Ratings and may cause output saturation or self-test failure.

What is the function of the Aux_In pin and when should it be used?

Aux_In is an auxiliary analog input routed to the Vout pin when S1=S0=1 (per Table 7). It allows sharing one ADC channel between the three accelerometer axes and an external signal - e.g., temperature sensor output or battery voltage monitor - reducing system component count. It is not internally conditioned and must be within -0.3 V to Vdd+0.3 V.