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
56
57
58
59
60
61
67
Digital Sensitivity (SPI, 10-Bit Output)
25g (MMA6851)
50g (MMA6853)
60g (MMA6856)
120g (MMA6855)
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
Δ SENS
Δ SENS
Δ SENS
?
?
?
?
-4
-5
-5
20.479
9.766
8.192
4.096
?
?
?
?
?
?
?
+4
+5
+5
LSB/g
LSB/g
LSB/g
LSB/g
%
%
%
(1, 9)
(1, 9)
(1, 9)
(1, 9)
(1)
(1)
(3)
Offset at 0g (No Offset Cancellation)
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
OFFSET
OFFSET
OFFSET
452
-60
452
-60
512
0
512
0
572
+60
572
+60
LSB
LSB
LSB
LSB
(1)
(1)
(3)
(3)
Offset Monitor Thresholds
72
73
Positive Threshold (10-Bits, unsigned)
Negative Threshold (10-Bits, unsigned)
OFFTHR POS
OFFTHR NEG
612
412
LSB
LSB
(7)
(7)
Range of Output (SPI, 10-Bits, unsigned)
74
75
76
77
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)
78
79
80
81
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)
82 Nonlinearity
*
NL OUT
-1
1
% FSR
(3)
System Output Noise
83
84
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
85
86
87
88
89
90
91
92
V ZX
V YX
Self-Test Output Change (Ref Section 3.6 )
STMAG = 0, T A = 25°C
STMAG = 0, -40°C ≤ T A ≤ 105°C
STMAG = 1, T A = 25°C
STMAG = 1, -40°C ≤ T A ≤ 105°C
STMAG = 0, -40°C ≤ T A ≤ 105°C
V CC_UV_f ≤ V CC - V SS ≤ V L
STMAG = 1, -40°C ≤ T A ≤ 105°C
V CC_UV_f ≤ V CC - V SS ≤ V L
*
*
*
*
*
*
V ZX
V YX
Δ ST Low25
Δ ST Low
Δ ST HI25
Δ ST HI
Δ ST Low
Δ ST HI
-4
-4
Δ ST MIN
11.25
10.68
22.5
21.37
10.68
21.37
Δ ST NOM
15
15
30
30
15
30
+4
+4
Δ ST MAX
18.75
19.69
37.5
39.38
19.69
39.38
%
%
g
g
g
g
g
g
(3)
(3)
(1)
(1)
(1)
(1)
(3)
(3)
Acceleration (without hitting internal g-cell stops)
93
Any Range Positive/Negative
g g-cell_Clip
500
560
600
g
(19)
MMA685x
Sensors
Freescale Semiconductor, Inc.
7
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