Sensors

Freescale Semiconductor

39

MMA52xxWR

Preliminary

4.4.2.1

PSI5 Initialization Phase 2 (10-Bit Mode)

In PSI5 initialization phase 2, 10-bit mode, the device transmits a sequence of sensor specific configuration and serial number

information. The transmission data is in conformance with the PSI5 specification, Revision 1.3 and AKLV27, Revision 1.10. The

data content and transmission format is shown in Table 9 and Table 10. Table 9 shows the 10-bit phase 2 timing for different op-

erating modes. Times are calculated using the equation in Section 4.4.2.

1.

Offset and average self-test data will only be transmitted with sync pulse periods that guarantee the self-test phase1 & phase 2 will be complete prior to required

transmission. If sync pulse periods faster than this are used, ‘0’s will be transmitted instead of offset and/or average self-test data.

Table 9. Initialization Phase 2 Time (10-Bit Mode)

Operating Mode

Repetition Rate (k)

# of Transmissions

Nominal Phase 2 Time

Asynchronous Mode (228

μs)

8

512

116.7 ms

Synchronous Mode (500

μs)

4

256

128.0 ms

Table 10. PSI5 Initialization Phase 2 Data (10-Bit Mode)

PSI5 V1.2

Field ID #

PSI5 V1.2

Nibble ID #

Page

Address

PSI5 Nibble

Address

Register Address

Description

Value

F1

D1

0

0000

Hard-coded

Protocol Revision = V1.3

0100

F2

D2, D3

0001, 0010

Hard-coded

Number of Data Blocks = 32

0010 0000

F3

D4, D5

0011, 0100

Hard-coded

Manufacturer = Freescale

0100 0110

F4

D6, D7

0101, 0110

Hard-coded

Sensor Type = Acceleration (high g)

0000 0001

F5

D8

0111

U_DIR[1:0] = 00: 0000

U_DIR[1:0] = 01: 0100

U_DIR[1:0] = 10: 1000

U_DIR[1:0] = 11: 1100 (not used)

Axis

User

D9

1000

±60g: 0111

±120g: 1000

±240g: 1001

±480g: 1010

Range

Varies

F6

D10

1001

DEVCFG2[7:4]

Sensor Specific Information

User

D11

1010

DEVCFG2[3:0]

Sensor Specific Information

User

F7

D12

1011

Hard-coded

Product Revision

0001

D13

1100

Hard-coded

Product Revision

0001

D14

1101

DEVCFG6[3:0]

Product Revision

User

F8

D15

1110

DEVCFG7[7:0], DEVCFG8[4:0]

converted to

Binary coded Julian Date

Reference Section 3.1.5.5

Production Date Information

User

D16

1111

Production Date Information

User

D17

1

0000

Production Date Information

User

D18

0001

Production Date Information

User

F9

D19

0010

SN0 (High Nibble)

Opuntia Serial Number

Factory

D20

0011

SN0 (Low Nibble)

Opuntia Serial Number

Factory

D21

0100

SN1 (High Nibble)

Opuntia Serial Number

Factory

D22

0101

SN1 (Low Nibble)

Opuntia Serial Number

Factory

D23

0110

SN2 (High Nibble)

Opuntia Serial Number

Factory

D24

0111

SN2 (Low Nibble)

Opuntia Serial Number

Factory

D25

1000

SN3 (High Nibble)

Opuntia Serial Number

Factory

D26

1001

SN3 (Low Nibble)

Opuntia Serial Number

Factory

D27

1010

Initial Raw Offset (Offset[3:0])

(If INIT2_EXT=1, ‘0000’ otherwise)

Varies

D28

1011

Initial Raw Offset (Offset7:4])

(If INIT2_EXT=1, ‘0000’ otherwise)

Varies

D29

1100

([AvgSelfTest[1:0],Offset[9:8]])

(If INIT2_EXT=1, ‘0000’ otherwise)

Varies

D30

1101

Average Self-Test

(AvgSelfTest[5:2])

(If INIT2_EXT=1, ‘0000’ otherwise)

Varies

D31

1110

Average Self-Test

(AvgSelfTest[9:6])

(If INIT2_EXT=1, ‘0000’ otherwise)

Varies

D32

1111

DEVCFG1 [7:4]

Sensor Specific

(If INIT2_EXT=1, ‘0000’ otherwise)

Varies