MMA1220 datasheet(3/10 Pages) FREESCALE

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MMA1220D

Sensors

Freescale Semiconductor

Table 2. Operating Characteristics

(Unless otherwise noted: –40°C

≤ TA ≤ +105°C, 4.75 ≤ VDD ≤ 5.25, Acceleration = 0g, Loaded output.(1))

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

Operating Range(2)

Supply Voltage(3)

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.

VDD

IDD

gFS

4.75

3.0

–40

—

5.00

5.0

—

11.0

5.25

6.0

+125

—

°C

Output Signal

Zero g (TA = 25°C, VDD = 5.0 V)(4)

Zero g

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

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

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

5. The device is calibrated at 5g.

VOFF

VOFF,V

f-3dB

NLOUT

2.25

0.45 VDD

237.5

46.5

150

–1.0

2.5

0.50 VDD

250

—

2.75

0.55 VDD

262.5

53.5

350

+3.0

mV/g

mV/g/V

% FSO

Noise

RMS (10 Hz – 1 kHz)

Clock Noise (without RC load on output)(6)

6. At clock frequency

≅70 kHz.

nRMS

nCLK

—

2.0

6.0

—

mVrms

mVpk

Self-Test

Output Response

Input Low

Input High

Input Loading(7)

Response Time(8)

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.

∆VST

VIL

VIH

IIN

tST

0.2 VDD

VSS

0.7 VDD

–50

—

–100

2.0

0.3 VDD

VDD

–200

µA

Status(9), (10)

Output Low (Iload = 100 µA)

Output High (Iload = 100 µA)

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.

VOL

VOH

—

VDD – 0.8

—

0.4

—

Output Stage Performance

Electrical Saturation Recovery Time(11)

Full Scale Output Range (IOUT = 200 µA)

Capacitive Load Drive(12)

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.

tDELAY

VFSO

—

VSS + 0.25

—

0.2

—

300

—

VDD – 0.25

100

—

Mechanical Characteristics

Transverse Sensitivity(13)

Package Resonance

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

VXZ,YZ

fPKG

—

5.0

—

% FSO

kHz

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