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2.4
Electrical Characteristics - Sensor and Signal Chain
V L ≤ (V CC - V SS ) ≤ V H , T L ≤ T A ≤ T H , | Δ T A | < 25 K/min unless otherwise specified
#
Characteristic
Symbol
Min
Typ
Max
Units
55
56
57
58
59
60
61
62
63
64
65
X-Axis Digital Sensitivity (SPI, 10-bit Output)
50g (MMA6813)
60g (MMA6811, MMA6826)
100g (MMA6825)
120g (MMA6821, MMA6823)
Y-Axis Digital Sensitivity (SPI, 10-bit Output)
25g (MMA6811, MMA6821)
50g (MMA6813QR)
60g (MMA6823, MMA6826)
100g (MMA6825)
Sensitivity Error
T A = 25°C
-40°C ≤ T A ≤ 105°C
-40°C ≤ T A ≤ 105°C,V CC_UV_f ≤ V CC - V SS ≤ V L
*
*
*
*
*
*
*
*
*
*
SENS
SENS
SENS
SENS
SENS
SENS
SENS
SENS
Δ SENS
Δ SENS
Δ SENS
?
?
?
?
?
?
?
?
-4
-5
-5
9.766
8.192
4.883
4.096
20.479
9.766
8.192
4.883
?
?
?
?
?
?
?
?
?
?
?
+4
+5
+5
LSB/g
LSB/g
LSB/g
LSB/g
LSB/g
LSB/g
LSB/g
LSB/g
%
%
%
(1, 9)
(1, 9)
(1, 9)
(1, 9)
(1, 9)
(1, 9)
(1, 9)
(1, 9)
(1)
(1)
(3)
Offset at 0g (No Offset Cancellation)
66
67
68
69
70
71
10-bits, unsigned
10-bits, signed
10-bits, unsigned, V CC_UV_f ≤ V CC - V SS ≤ V L
10-bits, signed, V CC_UV_f ≤ V CC - V SS ≤ V L
Offset Monitor Thresholds
Positive Threshold (10-bits, unsigned)
Negative Threshold (10-bits, unsigned)
*
*
OFFSET
OFFSET
OFFSET
OFFSET
OFFTHR POS
OFFTHR NEG
452
-60
452
-60
?
?
512
0
512
0
612
412
572
+60
572
+60
?
?
LSB
LSB
LSB
LSB
LSB
LSB
(1)
(1)
(3)
(3)
(7)
(7)
Range of Output (SPI, 10-bits unsigned)
72
73
74
75
Normal
Fault Response Code
Unused Codes
Unused Codes
RANGE
FAULT
UNUSED
UNUSED
32
—
1
993
—
0
?
?
992
—
31
1023
LSB
LSB
LSB
LSB
(7)
(7)
(7)
(7)
Range of Output (SPI, 10-bits, signed)
76
77
78
79
Normal
Fault Response Code
Unused Codes
Unused Codes
RANGE
FAULT
UNUSED
UNUSED
-480
—
-511
481
—
-512
—
—
480
—
-481
511
LSB
LSB
LSB
LSB
(7)
(7)
(7)
(7)
80 Nonlinearity
*
NL OUT
-1
—
1
% FSR
(3)
System Output Noise
81
82
RMS (10-bit, All Ranges, 400 Hz, 4-pole LPF)
Peak to Peak (10-bit, All Ranges, 400 Hz, 4-pole LPF)
n RMS
n P-P
—
—
—
—
0.5
1.0
LSB
LSB
(3)
(3)
Cross-Axis Sensitivity
83
84
85
86
87
88
89
90
91
92
93
94
V ZX
V YX
V ZY
V XY
Self-Test Output Change (Ref Section 3.6 )
STMAG_X, STMAG_Y = 0, T A = 25°C
STMAG_X, STMAG_Y = 0, -40°C ≤ T A ≤ 105°C
STMAG_X, STMAG_Y = 1, T A = 25°C
STMAG_X, STMAG_Y = 1, -40°C ≤ T A ≤ 105°C
STMAG_X, STMAG_Y = 0, -40°C ≤ T A ≤ 105°C
V CC_UV_f ≤ V CC - V SS ≤ V L
STMAG_X, STMAG_Y = 1, -40°C ≤ T A ≤ 105°C
V CC_UV_f ≤ V CC - V SS ≤ V L
Self-Test Cross Axis Output
Y-Axis Output with X-Axis Self-Test
X-Axis Output with Y-Axis Self-Test
*
*
*
*
*
*
*
*
V ZX
V YX
V ZY
V XY
Δ ST Low25
Δ ST Low
Δ ST HI25
Δ ST HI
Δ ST Low
Δ ST HI
Δ STCrossAxis
Δ STCrossAxis
-4
-4
-4
-4
Δ ST MIN
11.25
10.68
22.5
21.37
10.68
21.37
-10
-10
—
—
—
—
Δ ST NOM
15
15
30
30
15
30
?
?
+4
+4
+4
+4
Δ ST MAX
18.75
19.69
37.5
39.38
19.69
39.38
+10
+10
%
%
%
%
g
g
g
g
g
g
LSB
LSB
(3)
(3)
(3)
(3)
(1)
(1)
(1)
(1)
(3)
(3)
(1)
(1)
Acceleration (without hitting internal g-cell stops)
95
X/Y-Axis, Any Range Positive/Negative
g g-cell_Clip
500
560
600
g
(19)
MMA68xx
Sensors
Freescale Semiconductor, Inc.
7
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