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4.3
Acceleration Data Transfers
Twelve bit Acceleration data requests are initiated when the Acceleration bit of the SPI command message (A) is set to a logic
‘1’, and bit D[3] of the SPI command message is set to a logic ‘1’. The Axis Selection bit (AX) selects the type of acceleration data
requested, as shown in Table 31 .
Table 31. Acceleration Data Request
Axis Selection Bit (AX)
0
1
Data Type
X-Axis Acceleration Data
Y-Axis Acceleration Data
To verify that the device is configured as expected, each acceleration data request includes the configuration information which
impacts the output data. The requested configuration is compared against the data programmed in the writable register block.
Details are shown in Table 32 .
Table 32. Acceleration Data Request Configuration Information
Programmable Option
Raw or Offset Cancelled Data
Signed or Unsigned Data
Arming Function or PCM Output
Command Message Bit
OC
SD
ARM
Writable Register Information
DEVCFG[7] (OC)
DEVCFG[4] (SD)
DEVCFG[2] || DEVCFG[1] (A_CFG[2] || A_CFG[1])
If the data listed in Table 32 does not does not match, an Acceleration Data Request Mismatch failure is detected and no ac-
celeration data is transmitted. Reference Section 4.5.3.1 .
Acceleration data request commands include a parity bit (P). Odd parity is employed. The number of logic ‘1’ bits in the accel-
eration data request command must be an odd number.
Acceleration data is transmitted on the next SPI message if and only if all of the following conditions are met:
? The DEVINIT bit in the DEVSTAT register is not set
? The DEVRES bit in the DEVSTAT register is not set
? The IDE bit in the DEVSTAT register is not set (Reference Section 4.5.5 )
? No SPI Error is detected (Reference Section 4.5.1 )
? No MISO Error is detected (Reference Section 4.5.2 )
? No Acceleration Data Request Mismatch failure is detected (Reference Section 4.5.3.1 )
? No Self Test Error is present (reference Section 4.5.5.2 )
? No Offset Monitor Error is present for the requested channel (reference Section 4.5.6 )
If the above conditions are met, the device responds with a “valid acceleration data request” response as shown in Table 30 .
Otherwise, the device responds as specified in Section 4.5 .
MMA65xx
Sensor
48
Freescale Semiconductor, Inc.
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