参数资料
型号: MMA5248WR2
厂商: Freescale Semiconductor
文件页数: 33/58页
文件大小: 0K
描述: IC ACCELER 480G X-AXIS 16QFN
标准包装: 1,000
轴: X
加速范围: ±480g
灵敏度: 8LSB/g,4LSB/g,2LSB/g,1LSB/g
电源电压: 4.2 V ~ 17 V
输出类型: 数字
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(6x6)
4
4.1
PSI5 Layer and Protocol
Communication Interface Overview
The communication interface between a master device and the MMA52xx is established via a PSI5 compatible 2-wire inter-
face, with parallel or serial (daisy-chain) connections to the satellite modules. Figure 25 shows one possible system configuration
for multiple satellite modules in parallel.
MASTER DEVICE
SATELLITE MODULE #1
MMA52xx
V CC
V SS
V CC_OUT
V SS_OUT
Discrete
Components
V CC
I Data
V SS
SATELLITE MODULE #2
MMA52xx
V CC
V SS
V CC_OUT
V SS_OUT
Discrete
Components
V CC
I Data
V SS
Figure 25. PSI5 Satellite Interface Diagram
4.2
Data Transmission Physical Layer
The device uses a two wire interface for both its power supply (V CC ), and data transmission. The PSI5 master supplies a pre-
regulated voltage. Data transmissions and synchronization control from the PSI5 master to the device are accomplished via mod-
ulation of the supply voltage. Data transmissions from the device to the PSI5 master are accomplished via modulation of the cur-
rent on the power supply line.
4.2.1
Synchronization Pulse
The PSI5 master modulates the supply voltage in the positive direction to provide synchronization of the satellite sensor data.
Upon reception of a synchronization pulse, the device delays a specified period of time, called a time slot, before transmitting
acceleration data. For more details regarding time slots, refer to Section 3.1.4 , and Section 4.5 .
SYNC PULSES
V IDLE + Δ V SYNC
V IDLE
GND
I IDLE + I MOD
I IDLE
Figure 26. Synchronous Communication Overview
MMA52xxKW
Sensors
Freescale Semiconductor, Inc.
33
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