MMA685X datasheet(35/52 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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35 / 52 page

Sensors

Freescale Semiconductor, Inc.

MMA685x

3.8.8

Acceleration Data Timing

The MMA685x SPI uses a request/response protocol, where a SPI transfer is completed through a sequence of 2 phases.

Reference Section 4 for more details regarding the SPI protocol. In order to provide the most recent acceleration data for each

request, MMA685x latches the associated data for an acceleration request at the falling edge of CS for the acceleration response

message (the subsequent SPI transfer). The most recent sample available from the DSP (including interpolation), is latched, pro-

viding a maximum latency of 1* tS relative to the falling edge of CS.

Figure 23. Acceleration Data Timing

SCLK

MOSI

MISO

Request Accel.

Acceleration Data

Request Accel.

Acceleration Data

Acceleration Data Latched

Arm Function updated if applicable

MMA685X Datasheet(PDF) 35 Page - Freescale Semiconductor, Inc