LFSTBEB7660 Freescale Semiconductor, LFSTBEB7660 Datasheet - Page 21

• Manufacturer Part Number: LFSTBEB7660
• Description: BOARD DEV ACCELEROMETR MMA7660
• Manufacturer: Freescale Semiconductor

Specifications of LFSTBEB7660

• Sensor Type: Accelerometer, 3 Axis
• Sensing Range: ±1.5g
• Interface: USB
• Sensitivity: 21.33 count/g
• Voltage - Supply: 5V, USB
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: MMA7660
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

$09: Tap/Pulse Detection Register (Read/Write)
PDET
NOTE: If XDA = YDA = ZDA = 0, samples per second is 120 samples/second, and Auto-Wake/Sleep feature is enabled,
XDA
1: X-axis is disabled for tap detection
0: X-axis is enabled for tap detection
YDA
1: Y-axis is disabled for tap detection
0: Y-axis is enabled for tap detection
$0A: PD: Tap/Pulse Debounce Count Register (Read/Write)
Sensors
Freescale Semiconductor
PDTH[4:0]
00000000
00000001
00000010
00000011
11111101
11111110
11111111
PD[4:0]
PD[7]
ZDA
00000
00001
00010
00011
11101
11110
11111
D7
D7
0
0
...
...
the tap interrupt will reset the sleep counter.
The tap detection debounce filtering requires 2 adjacent tap detection tests to be the same to trigger a tap event and set the
Tap bit in the TILT (0x03) register, and optionally set an interrupt if PDINT is set in the INTSU (0x06) register. Tap detection
response time is nominally 0.52 ms.
Tap detection debounce filtering requires 3 adjacent tap detection tests to be the same to trigger a tap event and set the Tap
bit in the TILT (0x03) register, and optionally set an interrupt if PDINT is set in the INTSU (0x06) register. Tap detection
response time is nominally 0.78 ms.
Tap detection debounce filtering requires 4 adjacent tap detection tests to be the same to trigger a tap event and set the Tap
bit in the TILT (0x03) register, and optionally set an interrupt if PDINT is set in the INTSU (0x06) register. Tap detection
response time is nominally 1.04 ms.
... and so on up to...
Tap detection debounce filtering requires 254 adjacent tap detection tests to be the same to trigger a tap event and set the
Tap bit in the TILT (0x03) register, and optionally set an interrupt if PDINT is set in the INTSU (0x06) register. Tap detection
response time is nominally 66.04 ms.
Tap detection debounce filtering requires 255 adjacent tap detection tests to be the same to trigger a tap event and set the
Tap bit in the TILT (0x03) register, and optionally set an interrupt if PDINT is set in the INTSU (0x06) register. Tap detection
response time is nominally 66.3 ms.
Tap detection debounce filtering requires 256 adjacent tap detection tests to be the same to trigger a tap event and set the
Tap bit in the TILT (0x03) register, and optionally set an interrupt if PDINT is set in the INTSU (0x06) register. Tap detection
response time is nominally 66.56 ms.
Tap detection threshold is ±1 count
Tap detection threshold is ±2 counts
Tap detection threshold is ±3 counts
... and so on up to...
Tap detection threshold is ±29 counts
Tap detection threshold is ±30 counts
Tap detection threshold is ±31 counts
YDA
PD[6]
D6
D6
0
0
XDA
PD[5]
D5
0
D5
0
PDTH[4]
PD[4]
D4
D4
0
0
DESCRIPTION
DESCRIPTION
ZDA
1: Z-axis is disabled for tap detection
0: Z-axis is enabled for tap detection
PDTH[3]
PD[3]
D3
D3
0
0
PDTH[2]
PD[2]
D2
D2
0
0
PDTH[1]
PD[1]
D1
D1
0
0
MMA7660FC
PDTH[0]
PD[0]
D0
D0
0
0
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