HMC5883L Просмотр технического описания (PDF) - Honeywell International

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HMC5883L

HMC5883L / 3-Axis Digital Compass IC

Honeywell International 

HMC5883L

configurations. This prevents drawing down the supply voltage (VDD).

MODES OF OPERATION

This device has several operating modes whose primary purpose is power management and is controlled by the Mode

Register. This section describes these modes.

Continuous-Measurement Mode

During continuous-measurement mode, the device continuously makes measurements, at user selectable rate, and

places measured data in data output registers. Data can be re-read from the data output registers if necessary; however,

if the master does not ensure that the data register is accessed before the completion of the next measurement, the data

output registers are updated with the new measurement. To conserve current between measurements, the device is

placed in a state similar to idle mode, but the Mode Register is not changed to Idle Mode. That is, MD[n] bits are

unchanged. Settings in the Configuration Register A affect the data output rate (bits DO[n]), the measurement

configuration (bits MS[n]), when in continuous-measurement mode. All registers maintain values while in continuous-

measurement mode. The I2C bus is enabled for use by other devices on the network in while continuous-measurement

mode.

Single-Measurement Mode

This is the default power-up mode. During single-measurement mode, the device makes a single measurement and

places the measured data in data output registers. After the measurement is complete and output data registers are

updated, the device is placed in idle mode, and the Mode Register is changed to idle mode by setting MD[n] bits. Settings

in the configuration register affect the measurement configuration (bits MS[n])when in single-measurement mode. All

registers maintain values while in single-measurement mode. The I2C bus is enabled for use by other devices on the

network while in single-measurement mode.

Idle Mode

During this mode the device is accessible through the I2C bus, but major sources of power consumption are disabled,

such as, but not limited to, the ADC, the amplifier, and the sensor bias current. All registers maintain values while in idle

mode. The I2C bus is enabled for use by other devices on the network while in idle mode.

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