Datasheet

BMM150 Geomagnetic Sensor

Page 29

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.

Register (0x4E) contains control bits interrupt settings and axes enable bits. (Also refer to

chapter 0 for the details of magnetometer interrupt operation). If a magnetic measurement

channel is disabled, its last measured magnetic output values will remain in the data registers. If

the Z channel is disabled, the resistance measurement will also be disabled and the resistance

output value will be set to zero. If interrupts are set to trigger on an axis that has been disabled,

these interrupts will still be asserted based on the last measured value.

Table 20: Interrupt settings and axes enable bits control register (0x4E)

(0x4E) Bit

Name

Description

Bit 7

Data Ready Pin En

Enables data ready status mapping on DRDY pin

(active high, default is “0” disabled)

Bit 6

Interrupt Pin En

Enables interrupt status mapping on INT pin

(active high, default is “0” disabled)

Bit 5

Channel Z

Enable z-axis and resistance measurement

(active low, default is “0” enabled)

Bit 4

Channel Y

Enable y-axis

(active low, default is “0” enabled)

Bit 3

Channel X

Enable x-axis

(active low, default is “0” enabled)

Bit 2

DR Polarity

Data ready (DRDY) pin polarity

(“0” is active low, “1” is active high, default is “1”

active high)

Bit 1

Interrupt Latch

Interrupt latching

(“0” means non-latched - interrupt pin is on as long

as the condition is fulfilled, “1” means latched -

interrupt pin is on until interrupt status register 0x4A

is read, default is ‘”1” latched)

Bit 0

Interrupt Polarity

Interrupt pin INT polarity selection

(“1” – is active high, “0” is active low, default is “1”

active high)

Register (0x4F) contains the Low-Threshold interrupt threshold setting. (Also refer to chapter 0

for the details of magnetometer interrupt operation and the threshold setting).

Table 21: Low-threshold interrupt threshold setting control register (0x4F)

(0x4F) Bit

Name

Description

Bit 7

LowThreshold <7>

Bit 7 of Low-Threshold interrupt threshold setting

Bit 6

LowThreshold <6>

Bit 6 of Low-Threshold interrupt threshold setting

Bit 5

LowThreshold <5>

Bit 5 of Low-Threshold interrupt threshold setting

Bit 4

LowThreshold <4>

Bit 4 of Low-Threshold interrupt threshold setting

Bit 3

LowThreshold <3>

Bit 3 of Low-Threshold interrupt threshold setting

Bit 2

LowThreshold <2>

Bit 2 of Low-Threshold interrupt threshold setting

Bit 1

LowThreshold <1>

Bit 1 of Low-Threshold interrupt threshold setting

Bit 0

LowThreshold <0>

Bit 0 of Low-Threshold interrupt threshold setting