Sensors

20

Freescale Semiconductor

MMA7455L

LDPL

0: Level detection polarity is positive and detecting condi-

tion is OR 3 axes.

1: Level detection polarity is negative detecting condition

is AND 3 axes.

PDPL

0: Pulse detection polarity is positive and detecting condi-

tion is OR 3 axes.

1: Pulse detection polarity is negative and detecting con-

dition is AND 3 axes.

DRVO

0: Standard drive strength on SDA/SDO pin

1: Strong drive strength on SDA/SDO pin

LDTH[7:0]: Level detection threshold value. If THOPT bit in Detection Control Register is “0”, it is unsigned 7 bits value and

LDTH[7] should be “0”. If THOPT bit is “1”, it is signed 8 bits value.

PDTH[6:0]: Pulse detection threshold value (unsigned 7 bits).

XPDTH: This bit should be “0”.

Min: PD[7:0] = 4’h01 = 0.5 ms

Max: PD[7:0] = 4’hFF = 127 ms

1 LSB = 0.5 ms

Min: LT[7:0] = 8’h01 = 1 ms

Max: LT[7:0] = 8’hFF = 255 ms

1 LSB = 1 ms

Min: TW[7:0] = 8’h01 = 1 ms (Single pulse detection)

Max: TW[7:0] = 8’hFF = 255 ms

1 LSB = 1 ms

$19: Control 2 (Read/Write)

D7

D6

D5

D4

D3

D2

D1

D0

Bit

DRVO

PDPL

LDPL

Function

0

0

0

0

0

0

0

0

Default

$1A: Level detection threshold limit value (Read/Write)

D7

D6

D5

D4

D3

D2

D1

D0

Bit

LDTH[7]

LDTH[6]

LDTH[5]

LDTH[4]

LDTH[3]

LDTH[2]

LDTH[1]

LDTH[0]

Function

0

0

0

0

0

0

0

0

Default

$1B: Pulse detection threshold limit value (Read/Write)

D7

D6

D5

D4

D3

D2

D1

D0

Bit

XPDTH

PDTH[6]

PDTH[5]

PDTH[4]

PDTH[3]

PDTH[2]

PDTH[1]

PDTH[0]

Function

0

0

0

0

0

0

0

0

Default

$1C: Pulse duration value (Read/Write)

D7

D6

D5

D4

D3

D2

D1

D0

Bit

PD[7]

PD[6]

PD[5]

PD[4]

PD[3]

PD[2]

PD[1]

PD[0]

Function

0

0

0

0

0

0

0

0

Default

$1D: Latency time value (Read/Write)

D7

D6

D5

D4

D3

D2

D1

D0

Bit

LT[7]

LT[6]

LT[5]

LT[4]

LT[3]

LT[2]

LT[1]

LT[0]

Function

0

0

0

0

0

0

0

0

Default

$1E: Time window for 2nd pulse value (Read/Write)

D7

D6

D5

D4

D3

D2

D1

D0

Bit

TW[7]

TW[6]

TW[5]

TW[4]

TW[3]

TW[2]

TW[1]

TW[0]

Function

0

0

0

0

0

0

0

0

Default