MPL3115A2

Sensors

Freescale Semiconductor, Inc.

15

5.4

Power Modes of Operation

Figure 7. Mode Transition Diagram

5.4.1

Off

5.4.2

STANDBY

The digital sections are operational and the unit is capable of receiving commands and delivering stored data. The analog

sections are off. The part is waiting for CTRL_REG1 to be configured and the part to enter active mode.

5.4.3

ACTIVE

Both analog and digital sections are running. The unit is capable of gathering new data, and accepting commands.

MPL3115A2 is fully functional.

6

Functionality

The device is a low-power, high accuracy digital output altimeter, barometer and thermometer, packaged in a 3 x 5 x 1.1 mm

The device has two operational modes, barometer and altimeter. Both modes include a thermometer temperature output func-

tion.

Power consumption and sensitivity are programmable where the data oversampling ratio can be set to balance current con-

suitable for direct interfacing with a microcontroller. The device features two independently programmable interrupt signals INT1

and INT2. These can be set to generate an interrupt signal when a new set of Pressure/Altitude and Temperature data is avail-

able, thereby simplifying data acquisition for the host controller. These interrupt pins can also be configured to generate interrupts

when a user programmed set of conditions are met (See section 6.6). Examples are: Interrupt can be triggered when a single

new data acquisition is ready, when a desired number of samples are stored within the internal FIFO or when a change of Pres-

sure/Altitude or Temperature is detected.

In RAW mode, the FIFO must be disabled and all other functionality: Alarms, Deltas and other interrupts are disabled.

Table 7. Mode of Operation Description

Mode

VDD

Function Description

OFF

Powered Down

< 1.62V

< VDD + 0.3V

Device is powered off.

STANDBY

ON

SBYB bit of CTRL_REG1 is

cleared

Only POR and digital blocks are enabled.

Analog subsystem is disabled.

ACTIVE

ON

SBYB bit of CTRL_REG1 is

set

All blocks are enabled (POR, digital, analog).

SLEEP

WAKE

STANDBY

OFF

ACTIVE