MMA7455L(2007) Ver la hoja de datos (PDF) - Freescale Semiconductor
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MMA7455L Datasheet PDF : 27 Pages
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$19: Control 2 (Read/Write)
D7
D6
D5
D4
D3
D2
DRVO
0
0
0
0
0
0
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.
D1
D0
Bit
PDPL
LDPL Function
0
0
Default
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
$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
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.
$1B: Pulse detection threshold limit value (Read/Write)
D7
D6
D5
D4
D3
D2
D1
XPDTH PDTH[6] PDTH[5] PDTH[4] PDTH[3] PDTH[2] PDTH[1]
0
0
0
0
0
0
0
PDTH[6:0]: Pulse detection threshold value (unsigned 7 bits).
XPDTH: This bit should be “0”.
D0
PDTH[0]
0
Bit
Function
Default
$1C: Pulse duration value (Read/Write)
D7
D6
D5
D4
PD[7]
PD[6]
PD[5]
PD[4]
0
0
0
0
Min: PD[7:0] = 4’h01 = 0.5 ms
Max: PD[7:0] = 4’hFF = 127 ms
1 LSB = 0.5 ms
D3
PD[3]
0
D2
PD[2]
0
D1
PD[1]
0
D0
PD[0]
0
Bit
Function
Default
$1D: Latency time value (Read/Write)
D7
D6
D5
D4
LT[7]
LT[6]
LT[5]
LT[4]
0
0
0
0
Min: LT[7:0] = 8’h01 = 1 ms
Max: LT[7:0] = 8’hFF = 255 ms
1 LSB = 1 ms
D3
LT[3]
0
D2
LT[2]
0
D1
LT[1]
0
D0
LT[0]
0
Bit
Function
Default
$1E: Time window for 2nd pulse value (Read/Write)
D7
D6
D5
D4
D3
D2
TW[7]
TW[6]
TW[5]
TW[4]
TW[3]
TW[2]
0
0
0
0
0
0
Min: TW[7:0] = 8’h01 = 1 ms (Single pulse detection)
Max: TW[7:0] = 8’hFF = 255 ms
1 LSB = 1 ms
D1
TW[1]
0
D0
TW[0]
0
Bit
Function
Default
MMA7455L
20
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