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| 型号： | MMA6823AKW |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 38/54页 |
| 文件大小： | 0K |
| 描述： | IC ACCELEROMETER XY AXIS 16QFN |
| 标准包装： | 75 |
| 轴： | X，Y |
| 加速范围： | ±120g，±60g |
| 灵敏度： | 4.1 LSB/g，8.2 LSB/g |
| 电源电压： | 3.135 V ~ 5.25 V |
| 输出类型： | SPI |
| 带宽： | 400Hz |
| 接口： | SPI |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-QFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN-EP（6x6） |
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3.8.9.2
Arming Function: Count Mode
In count mode, the arming function compares each input sample against positive and negative thresholds that are individually
programmed for each axis via the ARMT_Xx and ARMT_Yx registers. Reference Section 3.1.9 for register details. If the sample
equals or exceeds either threshold, a sample counter is incremented. If the sample does not exceed either threshold, the sample
counter is reset to zero.
The sample rate for each axis is determined by the SPI acceleration data sample rate. At the falling edge of CS for an accel-
eration data SPI response, a new sample for the associated axis is compared against the thresholds. Reference Figure 25 . The
SPI acceleration data sample rate must meet the minimum time between requests (t ACC_REQ_x ) specified in Section 2.5 .
A sample count limit is programmable via the AWS_Xx[1:0] and AWS_Yx[1:0] bits in the ARMCFGX and ARMCFGY registers.
If the sample count reaches the programmable sample count limit, an arming condition is indicated, the ARM_X or ARM_Y output
is asserted for the associated axis, and the pulse stretch counter is set as described in Section 3.8.9.4 .
The ARM_X or ARM_Y output is de-asserted only when the pulse stretch counter expires. Figure 25 shows the arming output
operation for different SPI conditions.
AWS_xP[1:0]
ARMT_xP[7:0]
Offset Cancellation
1-4 Sample
OffCanc_ARM_x[10:0]
Counter
Pulse Stretch
Gating
I/O
ARM_x
ARMT_xN[7:0]
APS_x[1:0]
Figure 24. Arming Function Block Diagram - Count Mode
SCLK
CS
MOSI
Request X-Axis
Y-Axis Response
Request Y-Axis
X-Axis Response
Request X-Axis
Y-Axis Response
Request Y-Axis
X-Axis Response
MISO
ARM_X
ARM_Y
Y-Axis Arm Condition
Not Present
X-Axis Data Latched for
Arm Function and SPI
t ARM
X-Axis Arm Condition
Present
Y-Axis Data Latched for
Arm Function and SPI
Y-Axis Arm Condition
Present
X-Axis Data Latched for
Arm Function and SPI
t ARM
X-Axis Arm Condition
Not Present
Y-Axis Pulse Stretch
X-Axis Pulse Stretch
Figure 25. X and Y Axis Arming Conditions, Moving Average and Count Mode
MMA68xx
Sensors
38
Freescale Semiconductor, Inc.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MMA6823AKWR2 | 功能描述:加速计 - 板上安装 XY-AXIS 120/ 60G 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 |
| MMA6823BKW | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Dual-Axis SPI Inertial Sensor |
| MMA6823BKWR2 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Dual-Axis SPI Inertial Sensor |
| MMA6823KW | 功能描述:加速计 - 板上安装 XY-AXIS 120/ 60G QFN 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 |
| MMA6823KWR2 | 功能描述:加速计 - 板上安装 XY-AXIS 120/ 60G QFN 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 |
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