Sensors

28

Freescale Semiconductor

MMA690xQ

ELECTRICAL CHARACTERISTICS (continued)

* Indicates a Freescale critical characteristic.

Characteristic

Symbol

Min

Typ

Max

Units

Range of Output

11-bit data, unsigned

Normal

Critical Fault Value

Invalid Axis Selection

Positive Acceleration Overflow Code

Positive Acceleration Overrange Code

Negative Acceleration Underrange Code

Negative Acceleration Underlfow Code

SPI Clock Fault

DIN Parity Fault

Unused Code

RANGE

CFU

IAU

SCFU

PFU

UNUSED

5

—

—

—

—

—

—

—

—

—

—

2047

2046

2045

2044

4

3

2

1

0

2043

—

—

—

—

—

—

—

—

—

digit

digit

digit

digit

digit

digit

digit

digit

digit

digit

(1)

(1)

(1)

(1)

(1)

(1)

(1)

(1)

(1)

(1)

1.Functionality verified 100% via scan. timing characteristic is directly determined by internal oscillator frequency.

Output value on overrange

11-bit data: 2043

3.5g Range

5.0g Range

11-bit data: 5

3.5g Range

5.0g Range

+3.22

+4.63

-3.79

-5.38

+3.50

+5.00

-3.50

-5.00

+3.79

+5.38

-3.22

-4.63

g

g

g

g

(2)

(2)

(2)

(2)

2.Verified by characterization, not tested in production.

Maximum acceleration without saturation of internal circuitry

(OVLD = 0)

< -12

—

> +12

g

(2)

-40

3.Self-test deflection is trimmed in positive direction. Deflection in negative direction is approximately equal in magnitude.

*

*

ΔST

ΔST

472

437

525

525

578

630

mg

mg

(4)

(4)

4.Parameters tested 100% at final test.

Cross-Axis Sensitivity

-4

-4

-4

—

—

—

+4

+4

+4

%

%

%

(2)

(2)

(2)

Output High Voltage

0.85

—

—

(5)

5.Parameters tested 100% at unit probe.

Output Low Voltage

——

0.1

(5)

Load Resistance

Load Capacitance

47

—

—

—

—

35

k

Ω

pF

(2)

(2)

Input High Voltage

0.65

—

—

(5)

Input Low Voltage

——

0.2

(5)

Input Current

CS/RESET

-30

190

30

-50

270

50

-260

350

260

μA

k

Ω

μA

(5)

(5)

(5)