Data Sheet

ICM-20948
Document Number: DS-000189 Page 12 of 89
Revision: 1.3
3.2 ACCELEROMETER SPECIFICATIONS
Typical Operating Circuit of section 4.2, VDD = 1.8V, VDDIO = 1.8V, T
A
=25°C, unless otherwise noted.
NOTES: All specifications apply to Low-Power Mode and Low-Noise Mode, unless noted otherwise
PARAMETER CONDITIONS MIN TYP MAX UNITS NOTES
ACCELEROMETER SENSITIVITY
Full-Scale Range
ACCEL_FS=0
±2
G
1
ACCEL_FS=1
±4
G
1
ACCEL_FS=2
±8
G
1
ACCEL_FS=3
±16
G
1
ADC Word Length
Output in two’s complement format
16
Bits
1
Sensitivity Scale Factor
ACCEL_FS=0
16,384
LSB/g
1
ACCEL_FS=1
8,192
LSB/g
1
ACCEL_FS=2
4,096
LSB/g
1
ACCEL_FS=3
2,048
LSB/g
1
Initial Tolerance
Component-level
±0.5
%
2
Sensitivity Change vs. Temperature -40°C to +85°C ACCEL_FS=0 ±0.026 %/ºC 2
Nonlinearity
Best Fit Straight Line
±0.5
%
2, 3
Cross-Axis Sensitivity
±2
%
2, 3
ZERO-G OUTPUT
Initial Tolerance
Component-level, all axes
±25
mg
2
Initial Tolerance
Board-level, all axes
±50
mg
2
Zero-G Level Change vs. Temperature
0°C to +85°C
±0.80
mg/°C
2
ACCELEROMETER NOISE PERFORMANCE
Noise Spectral Density
Based on Noise Bandwidth = 10 Hz
230
µg/√Hz
2
LOW PASS FILTER RESPONSE
Programmable Range
5.7
246
Hz
1, 3
ACCELEROMETER STARTUP TIME
From Sleep mode
20
ms
2, 3
From Cold Start, 1 ms V
DD
ramp
30
ms
2, 3
OUTPUT DATA RATE
Low-Power Mode
0.27
562.5
Hz
1
Low-Noise Mode
ACCEL_FCHOICE=1;
ACCEL_DLPFCFG=x
4.5 1.125k Hz
Low-Noise Mode
ACCEL_FCHOICE=0;
ACCEL_DLPFCFG=x
4.5k Hz
Table 2. Accelerometer Specifications
NOTES:
1. Guaranteed by design.
2. Derived from validation or characterization of parts, not guaranteed in production.
3. Low-noise mode specification.