MMA6231Q
Sensors
Freescale Semiconductor 3
Table 2. Operating Characteristics
Unless otherwise noted: -20°C < T
A
< 85°C, 3.0 V < V
DD
< 3.6 V, Acceleration = 0g, Loaded output
(1)
1. For a loaded output, the measurements are observed after an RC filter consisting of a 1.0 kΩ resistor and a 0.1 µF capacitor to ground.
Characteristic Symbol Min Typ Max Unit
Operating Range
(2)
2. These limits define the range of operation for which the part will meet specification.
Supply Voltage
(3)
3. Within the supply range of 2.7 and 3.6 V, the device operates as a fully calibrated linear accelerometer. Beyond these supply limits the device
may operate as a linear device but is not guaranteed to be in calibration.
V
DD
2.7 3.3 3.6 V
Supply Current
MMA6231Q I
DD
—1.2 1.5 mA
MMA6233Q I
DD
—2.2 3.0 mA
Operating Temperature Range T
A
–20 — +85 °C
Acceleration Range g
FS
—10 — g
Output Signal
Zero g (T
A
= 25°C, V
DD
= 3.3 V)
(4)
4. The device can measure both + and – acceleration. With no input acceleration the output is at midsupply. For positive acceleration the output
will increase above V
DD
/2. For negative acceleration, the output will decrease below V
DD
/2.
V
OFF
1.485 1.65 1.815 V
Zero g V
OFF
, T
A
—2.0 —mg/°C
Sensitivity (T
A
= 25°C, V
DD
= 3.3 V) S 111 120 129 mV/g
Sensitivity S, T
A
— 0.015 — %/°C
Bandwidth Response
MMA6231Q f
_3dB
— 300 — Hz
MMA6233Q f
_3dB
— 900 — Hz
Nonlinearity NL
OUT
–1.0 — +1.0 % FSO
Noise
MMA6231Q RMS (0.1 Hz – 1 kHz) n
RMS
—0.7 —mVrms
MMA6233Q RMS (0.1 Hz – 1 kHz) n
RMS
—0.6 —
Power Spectral Density RMS (0.1 Hz – 1 kHz)
MMA6231Q n
PSD
—50 —ug/√Hz
MMA6233Q n
PSD
—30 —
Self-Test
Output Response g
ST
2.0 — — g
Input Low V
IL
— — 0.3 V
DD
V
Input High V
IH
0.7 V
DD
—V
DD
V
Pull-Down Resistance
(5)
5. The digital input pin has an internal pull-down resistance to prevent inadvertent self-test initiation due to external board level leakages.
R
PO
43 57 71 kΩ
Response Time
(6)
6. Time for the output to reach 90% of its final value after a self-test is initiated.
t
ST
—2.0 — ms
Output Stage Performance
Full-Scale Output Range (I
OUT
= 200 µA) V
FSO
V
SS
+0.25 — V
DD
–0.25 V
Capacitive Load Drive
(7)
7. Preserves phase margin (60°) to guarantee output amplifier stability.
C
L
— — 100 pF
Output Impedance Z
O
— 50 300 Ω
Power-Up Response Time
MMA6231Q t
RESPONSE
—2.0 — ms
MMA6233Q t
RESPONSE
—0.7 — ms
Mechanical Characteristics
Transverse Sensitivity
(8)
8. A measure of the device’s ability to reject an acceleration applied 90° from the true axis of sensitivity.
V
ZX
,
YX
,
ZY
–5.0 — +5.0 % FSO
