MMA685X datasheet(42/52 Pages) FREESCALE

Part #	MMA685X

Description	Single-Axis SPI Inertial Sensor

PDF	52 Pages

Scroll/Zoom	100%

Manufacturer	FREESCALE [Freescale Semiconductor, Inc]

Direct Link	http://www.freescale.com

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Freescale Semiconductor, Inc.

MMA685x

SPI Communications

Communication with MMA685x is completed through synchronous serial transfers via SPI. MMA685x is a slave device con-

figured for CPOL = 0, CPHA = 0, MSB first. SPI transfers are completed through a sequence of two phases. During the first

phase, the type of transfer and associated control information is transmitted from the SPI master to MMA685x. Data from

MMA685x is transmitted during the second phase. Any activity on MOSI or SCLK is ignored when CS is negated. Consequently,

intermediate transfers involving other SPI devices may occur between phase one and phase two. Refer to Figure 33.

Figure 33. SPI Transfer Detail

T3P1

SCLK

MOSI

MISO

T1P1

T2P1

T1P2

T2P2

T3P2

SCLK

MOSI

MISO

Phase One: Command

Phase Two: Response

Phase One: Response -Previous Command

MMA685X Datasheet(PDF) 42 Page - Freescale Semiconductor, Inc