Freescale Semiconductor MMA7455L, Technical Data Manual

Sensors
Freescale Semiconductor

7

MMA7455L

Table 3. Operating Characteristics 

Unless otherwise noted: –40°C < T

A

 < 85°C, 2.4 V < AV

DD

 < 3.6 V, Acceleration = 0g, Loaded output.

Characteristic

Symbol

Min

Typ

Max

Unit

Analog Supply Voltage

Standby/Operation Mode

Enable Bus Mode

Digital I/O Pins Supply Voltage

(1)

Standby/Operation Mode

Enable Bus Mode

AV

DD

AV

DD

DV

DD_IO

DV

DD_IO

2.4

2.4

2.8

0

2.8

0

3.6

3.6

V

V

V

V

Supply Current Drain

Operation Mode

Pulse Detect Function Mode

Standby Mode (except data loading and I

2

C/SPI communication period)

I

DD

I

DD

I

DD

—

—

—

400

400

2.5

490

490

10

μ

A

μ

A

μ

A

Operating Temperature Range

T

A

-40

25

85

°C

0g Output Signal (T

A

=25°C, AV

DD

 = 2.8 V)

±2g range (25°C) 8-bit       GLVL[1:0]= 0 1

±4g range (25°C) 8-bit       GLVL[1:0]= 1 0

±8g range (25°C) 8-bit       GLVL[1:0]= 0 0

±8g range (25°C) 10-bit

-18

-10

-5

-18

0

0

0

0

18

10

5

18

count

count

count

count

Sensitivity (T

A

=25°C, AV

DD 

= 2.8 V)

±2g range (25°C) 8-bit      

±4g range (25°C) 8-bit       

±8g range (25°C) 8-bit      

±8g range (25°C) 10-bit     

58

29

14.5

58

64

32

16

64

70

35

17.5

70

count/g

count/g

count/g

count/g

Self-Test Output Response

Zout

Δ

ST

Z

32

64

83

count

Temperature Compensation for Offset

T

CO

±3.5

±0.5

+3.5

mg/°C

Temperature Sensitivity for Offset

T

CS

±0.026

±0.01

+0.026

mg/°C

Input High Voltage

Input Low Voltage

V

IH

V

IL

0.7 x DVDD

—

—

—

—

0.35 x DVDD

V

V

Internal Clock Frequency (T

A

 = 25°C, AV

DD

 = 2.8 V)

t

CLK

140

150

160

kHz

SPI Frequency

DV

DD_IO  

< 2.4 V

DV

DD_IO  

> 2.4 V

—

—

4

8

—

—

MHz

MHz

Bandwidth for Data Measurement (User Selectable)

DFBW 0

DFBW 1

—

—

62.5

125

—

—

Hz

Hz

Output Data Rate

Output Data Rate is 125 Hz when 62.5 bandwidth is selected.

Output Data rate is 250 Hz when 125 Hz bandwidth is selected.

—

—

125

250

—

—

Hz

Hz

Control Timing

Wait Time for I

2

C/SPI ready after power on

Turn On Response Time (Standby to Normal Mode)

Turn Off Response Time (Normal to Standby Mode)

Self-Test Response Time

Sensing Element Resonant Frequency

XY

Z

t

su

t

ru

t

rd

t

st

f

GCELLXY

f

GCELLZ

—

—

—

—

—

—

1

—

—

—

6.0

3.4

—

20

20

20

—

—

ms

ms

ms

ms

kHz

kHz

Nonlinearity (2 g range)

-1

—

+1

%FS

Cross Axis Sensitivity

-5

—

+5

%

1. It is recommended to tie the analog and digital supply voltages together.