FXOS8700CQ datasheet(33/86 Pages) FREESCALE

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Freescale Semiconductor, Inc.

9.1.10

CTRL_REG3 [Interrupt Control Register] (0x2C) register

Table 26. CTRL_REG2[mods] oversampling modes

(s)mods1

(s)mods0

Power mode

Normal

Low Noise, Low Power

High Resolution

Low Power

Table 27. Current Consumption versus Oversampling

Mode

Normal

Low noise,

Low power

High resolution

Low power

ODR

Current

μA

OS ratio

Current

μA

OS ratio

Current

μA

OS ratio

Current

μA

OS ratio

1.5625

128

245

1024

6.25

245

256

12.5

245

128

245

100

245

200

126

245

400

245

126

800

245

fifo_gate

wake_trans

wake_lndprt

wake_pulse

wake_ffmt

wake_en_a_vecm

ipol

pp_od

Figure 19. CTRL_REG3 register

Table 28. CTRL_REG3 bit descriptions

Field

Description

fifo_gate

0: FIFO gate is bypassed. FIFO is flushed upon the system mode transitioning from Wake-to-Sleep mode or from Sleep-

to-Wake mode.

1: The FIFO input buffer is blocked when transitioning from “Wake-to-Sleep” mode or from “Sleep-to-Wake” mode until

the FIFO is flushed.(1) Although the system transitions from “Wake-to-Sleep” or from “Sleep-to-Wake” the contents of the

FIFO buffer are preserved, new data samples are ignored until the FIFO is emptied by the host application.

If the FIFO_GATE bit is set to logic ‘1’ and the FIFO buffer is not emptied before the arrival of the next sample, then the

SYSMOD[fgerr] will be asserted. The SYSMOD[fgerr] bit remains asserted as long as the FIFO buffer remains un-

emptied.

Emptying the FIFO buffer clears the SYS_MOD[fgerr] register.

wake_tran

0: Transient function is disabled in Sleep mode

1: Transient function is enabled in Sleep mode and can generate an interrupt to wake the system

wake_lndprt

0: Orientation function is disabled Sleep mode.

1: Orientation function is enabled in Sleep mode and can generate an interrupt to wake the system

wake_pulse

0: Pulse function is disabled in Sleep mode

1: Pulse function is enabled in Sleep mode and can generate an interrupt to wake the system

wake_ffmt

0: Freefall/motion function is disabled in Sleep mode

1: Freefall/motion function is enabled in Sleep mode and can generate an interrupt to wake the system

wake_en_a_vecm

0: Acceleration vector magnitude function is disabled in Sleep mode

1: Acceleration vector magnitude function is enabled in Sleep mode and can generate an interrupt to wake the system

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