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MMA1254

Z-AXIS SENSITIVITY MICROMACHINED ACCELEROMETER ±5g

Freescale Semiconductor 

Table 2. Operating Characteristics

(Unless otherwise noted: –40°C TA +105°C, 4.75 VDD 5.25, Acceleration = 0g, Loaded output.(1))

Characteristic

Operating Range(2)

Supply Voltage(3)

Supply Current

Operating Temperature Range

Acceleration Range

Output Signal

+1g (TA = 25°C, VDD = 5.0 V)(4)

+1g (VDD = 5.0 V)

Sensitivity (TA = 25°C, VDD = 5.0 V)(5)

Sensitivity

Bandwidth Response

Nonlinearity

Noise

RMS (0.1 Hz – 1.0 kHz)

Spectral Density (RMS, 0.1 Hz – 1.0 KHz)(6)

Self-Test

Output Response (VDD = 5.0 V)

Input Low

Input High

Input Loading(7)

Response Time(8)

Status(9), (10)

Output Low (Iload = 100 A)

Output High (Iload = 100 A)

Output Stage Performance

Electrical Saturation Recovery Time(11)

Full Scale Output Range (IOUT = 200 A)

Capacitive Load Drive(12)

Output Impedance

Mechanical Characteristics

Transverse Sensitivity(13)

Symbol

Min

VDD

IDD

TA

gFS

VOFF

VOFF

S

S

f-3dB

NLOUT

nRMS

nSD

VST

VIL

VIH

IIN

tST

VOL

VOH

tDELAY

VFSO

CL

ZO

VXZ,YZ

4.75

1.1

–40

—

2.25

2.2

380

74

42.5

–1.0

—

—

0.2

VSS

0.7VDD

–300

—

—

VDD – 0.8

—

VSS + 0.25

—

—

—

Typ

5.00

2.1

—

5

2.5

2.5

400

80

50

—

2.0

700

0.25

—

—

–125

2.0

—

—

—

—

—

50

—

Max

Unit

5.25

V

3.0

mA

+105

°C

—

g

2.75

V

2.8

V

420

mV/g

86

mV/g/V

57.5

Hz

+1.0

% FSO

4.0

mVrms

—

g/ Hz

0.3

V/V

0.3 VDD

V

VDD

V

–50

A

25

ms

0.4

V

—

V

2.0

ms

VDD – 0.25

V

100

pF

—



5.0

% FSO

1. For a loaded output the measurements are observed after an RC filter consisting of a 1 k resistor and a 0.1 F capacitor to ground.

2. These limits define the range of operation for which the part will meet specification.

3. Within the supply range of 4.75 and 5.25 volts, 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.

4. The device can measure both + and – acceleration. With +1g acceleration the output is at midsupply. For positive acceleration the output

will increase above VDD/2 and for negative acceleration the output will decrease below VDD/2.

5. The device is calibrated at 3g. Sensitivity limits apply to 0Hz acceleration.

6. At clock frequency 70 kHz.

7. The digital input pin has an internal pull-down current source to prevent inadvertent self test initiation due to external board level leakages.

8. Time for the output to reach 90% of its final value after a self-test is initiated.

9. The Status pin output is not valid following power-up until at least one rising edge has been applied to the self-test pin. The Status pin is high

whenever the self-test input is high, as a means to check the connectivity of the self-test and Status pins in the application.

10. The Status pin output latches high if a Low Voltage Detection or Clock Frequency failure occurs, or the EPROM parity changes to odd. The

Status pin can be reset low if the self-test pin is pulsed with a high input for at least 100 s, unless a fault condition continues to exist.

11. Time for amplifiers to recover after an acceleration signal causes them to saturate.

12. Preserves phase margin (60°) to guarantee output amplifier stability.

13. A measure of the device's ability to reject an acceleration applied 90° from the true axis of sensitivity.

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