- 您现在的位置：买卖IC网 > Sheet目录478 > MMA8452QR1 (Freescale Semiconductor)IC ACCELER 2G/4G/8G 3AXIS 16QFN
6.4
Transient (HPF) Acceleration Detection
For more information on the uses of the transient function please review Freescale application note, AN4071. This function is
similar to the motion detection except that high-pass filtered data is compared. There is an option to disable the high-pass filter
through the function. In this case the behavior is the same as the motion detection. This allows for the device to have 2 motion
detection functions.
0x1D: Transient_CFG Register
The transient detection mechanism can be configured to raise an interrupt when the magnitude of the high-pass filtered
acceleration threshold is exceeded. The TRANSIENT_CFG register is used to enable the transient interrupt generation
mechanism for the 3 axes (X, Y, Z) of acceleration. There is also an option to bypass the high-pass filter. When the high-pass
filter is bypassed, the function behaves similar to the motion detection.
0x1D: TRANSIENT_CFG Register (Read/Write)
Bit 7
0
Bit 6
0
Bit 5
0
Bit 4
ELE
Bit 3
ZTEFE
Bit 2
YTEFE
Bit 1
XTEFE
Bit 0
HPF_BYP
Table 31. TRANSIENT_CFG Description
Transient event flags are latched into the TRANSIENT_SRC register. Reading of the TRANSIENT_SRC register clears the event
ELE
ZTEFE
YTEFE
XTEFE
HPF_BYP
flag. Default value: 0.
0: Event flag latch disabled; 1: Event flag latch enabled
Event flag enable on Z transient acceleration greater than transient threshold event. Default value: 0.
0: Event detection disabled; 1: Raise event flag on measured acceleration delta value greater than transient threshold.
Event flag enable on Y transient acceleration greater than transient threshold event. Default value: 0.
0: Event detection disabled; 1: Raise event flag on measured acceleration delta value greater than transient threshold.
Event flag enable on X transient acceleration greater than transient threshold event. Default value: 0.
0: Event detection disabled; 1: Raise event flag on measured acceleration delta value greater than transient threshold.
Bypass High-Pass filter Default value: 0.
0: Data to transient acceleration detection block is through HPF 1: Data to transient acceleration detection block is NOT through
HPF (similar to motion detection function)
0x1E: TRANSIENT_SRC Register
The Transient Source register provides the status of the enabled axes and the polarity (directional) information. When this
register is read it clears the interrupt for the transient detection. When new events arrive while EA = 1, additional *TRANSE bits
may get set, and the corresponding *_Trans_Pol flag become updated. However, no *TRANSE bit may get cleared before the
TRANSIENT_SRC register is read.
0x1E: TRANSIENT_SRC Register (Read Only)
Bit 7
0
Bit 6
EA
Bit 5
ZTRANSE
Bit 4
Z_Trans_Pol
Bit 3
YTRANSE
Bit 2
Y_Trans_Pol
Bit 1
XTRANSE
Bit 0
X_Trans_Pol
Table 32. TRANSIENT_SRC Description
EA
ZTRANSE
Z_Trans_Pol
YTRANSE
Y_Trans_Pol
XTRANSE
X_Trans_Pol
Event Active Flag. Default value: 0.
0: no event flag has been asserted; 1: one or more event flag has been asserted.
Z transient event. Default value: 0.
0: no interrupt, 1: Z Transient acceleration greater than the value of TRANSIENT_THS event has occurred
Polarity of Z Transient Event that triggered interrupt. Default value: 0.
0: Z event was Positive g, 1: Z event was Negative g
Y transient event. Default value: 0.
0: no interrupt, 1: Y Transient acceleration greater than the value of TRANSIENT_THS event has occurred
Polarity of Y Transient Event that triggered interrupt. Default value: 0.
0: Y event was Positive g, 1: Y event was Negative g
X transient event. Default value: 0.
0: no interrupt, 1: X Transient acceleration greater than the value of TRANSIENT_THS event has occurred
Polarity of X Transient Event that triggered interrupt. Default value: 0.
0: X event was Positive g, 1: X event was Negative g
When the EA bit gets set while ELE = 1, all other status bits get frozen at their current state. By reading the TRANSIENT_SRC
register, all bits get cleared.
MMA8452Q
Sensors
30
Freescale Semiconductor, Inc.
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
MMA8453QR1
IC ACCELER 2G/4G/8G 3AXIS 16QFN
MMBF0201NLT1
MOSFET N-CH 20V 300MA SOT-23
MMBF170-7
MOSFET N-CH 60V 500MA SOT23-3
MMBF170LT1
MOSFET N-CH 60V 500MA SOT-23
MMBF170
MOSFET N-CH 60V 500MA SOT-23
MMBF2201NT1
MOSFET N-CH 20V 300MA SOT-323
MMBF2202PT1
MOSFET P-CH 20V 300MA SOT-323
MMDF1N05ER2G
MOSFET N-CHAN DUAL 2A 50V 8SOIC
相关代理商/技术参数
MMA8452QT
功能描述:加速计 - 板上安装 LOW G 3-AXIS 12BT EX VLT
RoHS:否 制造商:Murata 传感轴:Double 加速:12 g 灵敏度: 封装 / 箱体: 输出类型:Analog 数字输出 - 位数:11 bit 电源电压-最大:5.25 V 电源电压-最小:4.75 V 电源电流:4 mA 最大工作温度:+ 125 C 最小工作温度:- 40 C
MMA8453Q
制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Xtrinsic MMA8453Q 3-Axis, 10-bit/8-bit Digital Accelerometer
MMA8453QR1
功能描述:加速计 - 板上安装 LOW G 3-AXIS DGTL ACCEL
RoHS:否 制造商:Murata 传感轴:Double 加速:12 g 灵敏度: 封装 / 箱体: 输出类型:Analog 数字输出 - 位数:11 bit 电源电压-最大:5.25 V 电源电压-最小:4.75 V 电源电流:4 mA 最大工作温度:+ 125 C 最小工作温度:- 40 C
MMA8453QT
功能描述:加速计 - 板上安装 LOW G 3-AXIS DGTL ACCEL
RoHS:否 制造商:Murata 传感轴:Double 加速:12 g 灵敏度: 封装 / 箱体: 输出类型:Analog 数字输出 - 位数:11 bit 电源电压-最大:5.25 V 电源电压-最小:4.75 V 电源电流:4 mA 最大工作温度:+ 125 C 最小工作温度:- 40 C
MMA8491Q
制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Xtrinsic MMA8491Q 3-Axis Multifunction Digital Accelerometer
MMA8491QR1
功能描述:加速计 - 板上安装 3-Axis Low Voltage Discrete Tilt Sensor
RoHS:否 制造商:Murata 传感轴:Double 加速:12 g 灵敏度: 封装 / 箱体: 输出类型:Analog 数字输出 - 位数:11 bit 电源电压-最大:5.25 V 电源电压-最小:4.75 V 电源电流:4 mA 最大工作温度:+ 125 C 最小工作温度:- 40 C
MMA8491QT
功能描述:加速计 - 板上安装 3-Axis Low Voltage Discrete Tilt Sensor
RoHS:否 制造商:Murata 传感轴:Double 加速:12 g 灵敏度: 封装 / 箱体: 输出类型:Analog 数字输出 - 位数:11 bit 电源电压-最大:5.25 V 电源电压-最小:4.75 V 电源电流:4 mA 最大工作温度:+ 125 C 最小工作温度:- 40 C
MMA8652FC
制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Xtrinsic MMA8652FC 3-Axis, 12-bit Digital Accelerometer