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3.8.9.3
Arming Function: Unfiltered Mode
On the falling edge of CS for an acceleration response, the most recent available DSP sample for the requested axis is com-
pared against positive and negative thresholds that are individually programmed for each axis via the ARMT_Xx and ARMT_Yx
registers. Reference Section 3.1.9 for register details. If the sample equals or exceeds either threshold, an arming condition is
indicated.
Once an arming condition is indicated for the X-Axis, the ARM_X output is asserted when CS is asserted and the MISO data
includes an acceleration response for that axis.
Once an arming condition is indicated for the Y-Axis, the ARM_Y output is asserted when CS is asserted and the MISO data
includes an acceleration response for that axis.
The pulse stretch function is not applied in Unfiltered mode.
Figure 26 contains a block diagram of the Arming Function operation in Unfiltered Mode. Figure 27 shows the Arming output
operation under the different SPI request conditions.
ACFG[2]
ACFG[1]
CS
AXIS Select
SCLK
CS
MOSI
ARMING FUNCTION
Interpolated Sample Rate
Figure 26. Arming Function Block Diagram - Unfiltered Mode
I/O
ARM_x
Request X-Axis
Y-Axis Response
Request Y-Axis
X-Axis Response
Request X-Axis
Y-Axis Response
Request Y-Axis
X-Axis Response
MISO
ARM_X
ARM_Y
Y-Axis Arm Condition
Not Present
X-Axis Data Latched for
Arm Function and SPI
X-Axis Arm Condition
Present
Y-Axis Data Latched for
Arm Function and SPI
Y-Axis Arm Condition
Present
X-Axis Data Latched for
Arm Function and SPI
X-Axis Arm Condition
Not Present
t ARM_UF_DLY
t ARM_UF_ASSERT
t ARM_UF_DLY
t ARM_UF_ASSERT
Figure 27. X and Y Axis Arming Conditions, Unfiltered Mode
MMA68xx
Sensors
Freescale Semiconductor, Inc.
39
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