Datasheet

BMM150 Geomagnetic Sensor

Page 26

BST-BMM150-DS001-01 | Revision 1.0 | April 2013

Bosch Sensortec

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Note: Specifications within this document are subject to change without notice.

5.5 Interrupt status register

Register (0x4A) contains the states of all interrupts.

Table 14: Interrupt status, register (0x4A)

(0x4A) Bit

Name

Description

Bit 7

Data overrun

Data overrun status flag

Bit 6

Overflow

Overflow status flag

Bit 5

High Int Z

High-Threshold interrupt z-axis status flag

Bit 4

High Int Y

High-Threshold interrupt y-axis status flag

Bit 3

High Int X

High-Threshold interrupt x-axis status flag

Bit 2

Low Int Z

Low-Threshold interrupt z-axis status flag

Bit 1

Low Int Y

Low-Threshold interrupt y-axis status flag

Bit 0

Low Int X

Low-Threshold interrupt x-axis status flag

5.6 Power and operation modes, self-test and data output rate control registers

Register (0x4B) contains control bits for power control, soft reset and interface SPI mode

selection. This special control register is also accessible in suspend mode.

Soft reset is executed when both bits (register 0x4B bit7 and bit1) are set “1”. Soft reset does

not execute a full POR sequence, but all registers are reset except for the “trim” registers above

register 0x54 and the power control register (0x4B). Soft reset always brings the device into

sleep mode. When device is in the suspend mode, soft reset is ignored and the device remains

in suspend mode. The two “Soft Reset” bits are reset to “0” automatically after soft reset was

completed. To perform a full POR reset, bring the device into suspend and then back into sleep

mode.

When SPI mode is selected, the “SPI3En” bit enables SPI 3-wire mode when set “1”. When

“SPI3En” is set “0” (default), 4-wire SPI mode is selected.

Setting the “Power Control bit” to “1” brings the device up from Suspend mode to Sleep mode,

when “Power Control bit” is set “0” the device returns to suspend mode (see chapter 4.2 for

details of magnetometer power modes).

Table 15: Power control, soft reset and SPI mode control register (0x4B)

(0x4B) Bit

Name

Description

Bit 7

Soft Reset ‘1’

One of the soft reset trigger bits.

Bit 6

-

(fixed to 0)

Bit 5

-

(fixed to 0)

Bit 4

-

(fixed to 0)

Bit 3

-

(fixed to 0)

Bit 2

SPI3en

Enable bit for SPI3 mode

Bit 1

Soft Reset ‘1’

One of the soft reset trigger bits.

Bit 0

Power Control bit

When set to “0”, suspend mode is selected