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MMA9555L Datasheet(PDF) 7 Page - NXP Semiconductors |
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MMA9555L Datasheet(HTML) 7 Page - NXP Semiconductors |
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7 / 132 page  Functional Overview MMA9555L Intelligent Pedometer Data Sheet, Rev. 2.2 © NXP B.V. 2016. All rights reserved. 7 2 General Description 2.1 Functional Overview The MMA9555L is an intelligent motion sensing pedometer, it consists of a 3-axis, MEMS accelerometer and a mixed-signal ASIC with an integrated, 32-bit CPU. The mixed-signal ASIC can be utilized to measure and condition the outputs of the MEMS accel- erometer, internal temperature sensor, or a differential analog signal from an external device. The calibrated, measured sensor outputs can be read via the slave I2C or SPI port and utilized internally within the MMA9555L to provide advanced intelligent motion detection outputs like pedometer step count, activity level and six directional orientation detections which can be accessed via the slave I2C or SPI port. Figure 1. MMA9555L block diagram A block-level view is shown in Figure 1 with building blocks of devices and built-in applications summarized at a high level. The analog/mixed-mode subsystem associated with a digital engine is composed of: • The analog subsystem is composed of: • A 3-axis transducer that is an entirely passive block including the MEMS structures. • An Analog Front End (AFE) with the following: – A capacitance-to-voltage converter – An analog-to-digital converter – A temperature sensor • The digital subsystem is composed of: • A 32-bit CPU • Memory: RAM, ROM, and flash • Rapid GPIO (RGPIO) port-control logic Analog Front End (AFE) BDM INTC DBG Flash ROM RAM I 2C Master X axis C to V ADC Temp Sensor I 2C slave SPI slave Control and mailbox CLKGEN Two-channel, 16-bit Timer / PWM module 16-bit Modulo timer module Programmable delay block INT_O Y axis Z axis VDD VSS RESET VSS VDDA VSSA SCL0/RGPIC0/SCLK SDA0/RGPIO1/SDI RGPIO2/SCL1/SDO RGPIO3/SDA1/SSB RGPIO4/INT RGPIO5/PDB_A/INT_O RGPIO6/AN0/TPMCH0 RGPIO7/AN1/TPMCH1 RGPIO8/PDB_B BKGD/MS/RPGPIO9 AN0 AN1 TPMCH0 TPMCH1 SCL1 SDA1 PDB_A PDB_B SCLK SDI SDO SSB SCL0 SDA0 BKGD INT 32 bit CPU |
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