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PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTF9-4100
Rev. 6
Jun-2011
TDT_H_THRESH
This register represents the 9-bit jerk high threshold to determine if a tap is detected. The Performance
Index (PI) is the jerk signal that is expected to be less than this threshold, but greater than the
TDT_L_THRESH threshold during single and double tap events. Note that to properly change the
value of this register, the PC1 bit in CTRL_REG1 must first be set to “0”. The Kionix recommended
default value is 182 (0xB6h) and the Performance Index is calculated as:
X’ = X(current) – X(previous)
Y’ = Y(current) – Y(previous)
Z’ = Z(curre nt) – Z(previous)
PI = |X’| + |Y’| + |Z’|
Equation 1. Performance Index
R/W
TTH8
Bit7
R/W
TTH7
Bit6
R/W
TTH6
Bit5
R/W
TTH5
Bit4
R/W
TTH4
Bit3
R/W
TTH3
Bit2
R/W
TTH2
Bit1
R/W
TTH1
Bit0
Reset Value
10110110
I C Address: 0x2Ch
2
TDT_L_THRESH
This register represents the 7-bit jerk low threshold to determine if a tap is detected. The Performance
Index (PI) is the jerk signal that is expected to be greater than this threshold and less than the
TDT_H_THRESH threshold during single and double tap events. This register also contains the LSB
of the TDT_H_THRESH threshold. The Kionix recommended default value is 26 (0x1Ah). Note that to
properly change the value of this register, the PC1 bit in CTRL_REG1 must first be set to “0”.
R/W
TTH0
Bit7
R/W
TTL6
Bit6
R/W
TTL5
Bit5
R/W
TTL4
Bit4
R/W
TTL3
Bit3
R/W
TTL2
Bit2
R/W
TTL1
Bit1
R/W
TTL0
Bit0
Reset Value
00011010
I C Address: 0x2Dh
2
36 Thornwood Dr. – Ithaca, NY 14850
tel: 607-257-1080 – fax:607-257-1146
www.kionix.com - info@kionix.com
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