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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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MMA52XXKW 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:PSI5 Inertial Sensor
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MMA621010AEGR2 功能描述:加速计 - 板上安装 100/100G XY ANALOG 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
MMA621010AKEG 功能描述:加速计 - 板上安装 100/100G XY ANALOG 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
MMA621010AKEGR2 功能描述:加速计 - 板上安装 100/100G XY ANALOG 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
MMA621010EG 功能描述:加速计 - 板上安装 100 /100 XY DIGITAL 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