MMA8652FC datasheet(55/65 Pages) NXP

55 / 65 page

MMA8652FC

Sensors

Freescale Semiconductor, Inc.

6.12.3

0x2C: CTRL_REG3 Interrupt Control register

CTRL_REG3 register is used to control the Auto-WAKE/SLEEP function by setting the orientation or Freefall/Motion as an

interrupt to wake. CTRL_REG3 register also configures the interrupt pins INT1 and INT2.

Table 101. MODS Oversampling modes averaging values at each ODR

ODR

(Hz)

Mode

Normal (00)

Low Noise Low Power (01)

High Resolution (10)

Low Power (11)

Current

μA OS Ratio

Current

μA

OS Ratio

Current

μA OS Ratio Current μA OS Ratio

1.56

128

184

1024

6.5

6.25

184

256

6.5

12.5

184

128

6.5

184

100

184

200

184

400

184

800

184

Table 102. 0x2C CTRL_REG3 register (Read/Write)

Back to Register Address Map

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

FIFO_GATE

WAKE_TRANS

WAKE_LNDPRT

WAKE_PULSE

WAKE_FF_MT

IPOL

PP_OD

Table 103. CTRL_REG3 register

Bit(s)

Field

Description

7FIFO_GATE

FIFO Gate

0 FIFO gate is bypassed. (default)

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. Although the system transitions from WAKE to SLEEP or from SLEEP to

WAKE—the contents of the FIFO buffer are preserved, and new data samples are ignored until the FIFO is

emptied by the host application.

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

then the FGERR bit in the SYS_MOD register (0x0B) will be asserted. The FGERR bit remains asserted as

long as the FIFO buffer remains un-emptied. Emptying the FIFO buffer clears the FGERR bit in the

SYS_MOD register.

WAKE_TRANS

Wake from Transient interrupt

0 Transient function is bypassed in SLEEP mode. (default)

1 Transient function interrupt can wake up system

WAKE_LNDPRT

Wake from Orientation interrupt

0 Orientation function is bypassed in SLEEP mode. (default)

1 Orientation function interrupt can wake up system

WAKE_PULSE

Wake from Pulse interrupt

0 Pulse function is bypassed in SLEEP mode. (default)

1 Pulse function interrupt can wake up system

WAKE_FF_MT

Wake from Freefall/Motion interrupt

0 Freefall/Motion function is bypassed in SLEEP mode. (default)

1 Freefall/Motion function interrupt can wake up

1IPOL

Interrupt polarity

Selects the polarity of the interrupt signals.

When IPOL is 0 (default value), any interrupt event is signaled with a logical 0.

0 ACTIVE low (default)

1 ACTIVE high

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