MMA1220D

Sensors

Freescale Semiconductor

3

Table 2. Operating Characteristics

(Unless otherwise noted: –40°C

1. For a loaded output the measurements are observed after an RC filter consisting of a 1 k

Ω resistor and a 0.01 µF capacitor to ground.

Characteristic

Symbol

Min

Typ

Max

Unit

Supply Current

Operating Temperature Range

Acceleration Range

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.

4.75

3.0

–40

—

5.00

5.0

—

11.0

5.25

6.0

+125

—

V

mA

°C

g

Output Signal

Zero g

Sensitivity

Bandwidth Response

Nonlinearity

4. The device can measure both + and – acceleration. With no input acceleration the output is at midsupply. For positive acceleration the output

5. The device is calibrated at 5g.

S

2.25

237.5

46.5

150

–1.0

2.5

250

50

250

—

2.75

262.5

53.5

350

+3.0

V

V

mV/g

mV/g/V

Hz

% FSO

Noise

RMS (10 Hz – 1 kHz)

6. At clock frequency

≅70 kHz.

—

—

—

2.0

6.0

—

mVrms

mVpk

Self-Test

Output Response

Input Low

Input High

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.

VIH

–50

—

—

—

—

–100

2.0

–200

10

V

V

V

µA

ms

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

µs, unless a fault condition continues to exist.

—

—

—

0.4

—

V

V

Output Stage Performance

Output Impedance

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

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

—

—

—

0.2

—

—

300

—

100

—

ms

V

pF

W

Mechanical Characteristics

Package Resonance

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

—

—

—

10

5.0

—

% FSO

kHz