MMA8452Q

Sensors

Freescale Semiconductor, Inc.

39

0x2C: CTRL_REG3 Interrupt Control Register

IPOL bit selects the polarity of the interrupt signal. When IPOL is ‘0’ (default value) any interrupt event will signaled with a

logical 0.

PP_OD bit configures the interrupt pin to Push-Pull or in Open Drain mode. The default value is 0 which corresponds to Push-

Pull mode. The Open Drain configuration can be used for connecting multiple interrupt signals on the same interrupt line.

0x2D: CTRL_REG4 Register (Read/Write)

The corresponding functional block interrupt enable bit allows the functional block to route its event detection flags to the

system’s interrupt controller. The interrupt controller routes the enabled functional block interrupt to the INT1 or INT2 pin.

0x2C: CTRL_REG3 Register (Read/Write)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

0

WAKE_TRANS

WAKE_LNDPRT

WAKE_PULSE

WAKE_FF_MT

0

IPOL

PP_OD

Table 60. CTRL_REG3 Description

WAKE_TRANS

0: Transient function is bypassed in SLEEP mode. Default value: 0.

1: Transient function interrupt can wake up system

WAKE_LNDPRT

0: Orientation function is bypassed in SLEEP mode. Default value: 0.

1: Orientation function interrupt can wake up system

WAKE_PULSE

0: Pulse function is bypassed in SLEEP mode. Default value: 0.

1: Pulse function interrupt can wake up system

WAKE_FF_MT

0: Freefall/Motion function is bypassed in SLEEP mode. Default value: 0.

1: Freefall/Motion function interrupt can wake up

IPOL

Interrupt polarity ACTIVE high, or ACTIVE low. Default value: 0.

0: ACTIVE low; 1: ACTIVE high

PP_OD

Push-Pull/Open Drain selection on interrupt pad. Default value: 0.

0: Push-Pull; 1: Open Drain

0x2D: CTRL_REG4 Register (Read/Write)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

INT_EN_ASLP

0

INT_EN_TRANS

INT_EN_LNDPRT

INT_EN_PULSE

INT_EN_FF_MT

0

INT_EN_DRDY

Table 61. Interrupt Enable Register Description

Interrupt Enable

Description

INT_EN_ASLP

Interrupt Enable. Default value: 0.

0: Auto-SLEEP/WAKE interrupt disabled; 1: Auto-SLEEP/WAKE interrupt enabled.

INT_EN_TRANS

Interrupt Enable. Default value: 0.

0: Transient interrupt disabled; 1: Transient interrupt enabled.

INT_EN_LNDPRT

Interrupt Enable. Default value: 0.

0: Orientation (Landscape/Portrait) interrupt disabled.

1: Orientation (Landscape/Portrait) interrupt enabled.

INT_EN_PULSE

Interrupt Enable. Default value: 0.

0: Pulse Detection interrupt disabled; 1: Pulse Detection interrupt enabled

INT_EN_FF_MT

Interrupt Enable. Default value: 0.

0: Freefall/Motion interrupt disabled; 1: Freefall/Motion interrupt enabled

INT_EN_DRDY

Interrupt Enable. Default value: 0.

0: Data Ready interrupt disabled; 1: Data Ready interrupt enabled