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| 型号： | MMA6823AKW |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 23/54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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3.3.1
C REG Failure Detection
The digital supply voltage regulator is designed to be unstable with low capacitance. If the connection to the V REG capacitor
becomes open, the digital supply voltage will oscillate and cause either an undervoltage, or overvoltage failure within one internal
sample time. This failure will result in one of the following:
1. The DEVRES flag in the DEVSTAT register will be set. MMA68xx will respond to SPI acceleration requests as
defined in Table 30 .
2. MMA68xx will be held in RESET and be non-responsive to SPI requests.
3.3.2
C REGA Failure Detection
The analog supply voltage regulator is designed to be unstable with low capacitance. If the connection to the V REGA capacitor
becomes open, the analog supply voltage will oscillate and cause either an undervoltage, or overvoltage failure within one internal
sample time. The DEVRES flag in the DEVSTAT register will be set. MMA68xx will respond to SPI acceleration requests as de-
fined in Table 30 .
Note: This feature is only supported with a V CC supply voltage in the range of 4.75V to 5.25V.
3.3.3
V SS and V SSA Ground Loss Monitor
MMA68xx detects the loss of ground connection to either V SS or V SSA . A loss of ground connection to V SS will result in a V REG
overvoltage failure. A loss of ground connection to V SSA will result in a V REG undervoltage failure. Both failures result in a device
reset.
3.3.4
SPI Initiated Reset
In addition to voltage monitoring, a device reset can be initiated by a specific series of three write operations involving the
RES_1 and RES_0 bits in the DEVCTL register. Reference Section 3.1.5.1 . for details regarding the SPI initiated reset.
3.4
Internal Oscillator
MMA68xx includes a factory trimmed oscillator as specified in Section 2.6 .
3.4.1
Oscillator Monitor
The COUNT register in the customer accessible array is a read-only register which provides the current value of a free-running
8-bit counter derived from the primary oscillator. A 10-bit pre-scaler divides the primary oscillator by 1024. Thus, the value in the
COUNT register increases by one count every 128 μ s, and the register rolls over every 32.768 ms. The SPI master can period-
ically read the COUNT register, and verify the difference between subsequent register reads against the system time base.
1. The SPI access rates and deviations must be taken into account for this oscillator verification.
3.5
Transducer
ω n
s + 2 ? ξ ? ω n ? s + ω n
The MMA68xx transducer is an overdamped mass-spring-damper system described by the following transfer function:
2
H ( s ) = ---------------------------------------------------------
2 2
where:
ζ = Damping Ratio
ω n = Natural Frequency = 2 ?Π? f n
Reference Section 2.4 for transducer parameters.
MMA68xx
Sensors
Freescale Semiconductor, Inc.
23
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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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