MMA6222EG

Sensors

Freescale Semiconductor

21

Acceleration data is returned as illustrated below. In addition to the acceleration value, the axis associated with the measurement

is indicated in bit 13, while bits 11 and 10 provide status information.

Figure 4-5 Acceleration Command Response

Figure 4-6 Acceleration Command Response, Self-Test Active

4.1.4

AXIS Bit

Bit 13 indicates the axis associated with acceleration data, as shown below.

4.1.5

Status Bits

Data bits 11 and 10 convey additional information regarding the acceleration data being transmitted. If an error condition is indi-

cated, bits D9 through D0 contain flags which further describe the nature of the error.

The combination S1 = 0, S0 = 0 is never transmitted by MMA62XXEG in response to an acceleration data command.

Table 4-1 AXIS Bit Definitions

AXIS

Selected Axis

0

X

1

Y

Table 4-2 STATUS Bit Definitions

Status Bit

Definition

S1

S0

0

0

Not Applicable

0

1

Acceleration Data

1

0

Self-test Data

1

1

Error

SCLK

BIT

CS

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

0

AXIS

P

D4D3D2D1

D0

D6

D5

0

S1

S0

D9

D8

D7

SCLK

BIT

CS

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

0

AXIS

P

D4D3D2D1

D0

D6

D5

0

S1

S0

D9

D8

D7