HMC5843 Datasheet, PDF (7/19 Pages) Honeywell Solid State Electronics Center – 3-Axis Digital Compass IC

HMC5843
Power Management
This device is capable of operating with a single supply (AVDD) or dual supplies (AVDD and DVDD). Pin VREN makes
this selection by enabling the internal digital supply voltage regulator. When VREN is tied to AVDD, the device is in single
supply operation; this device is powered from AVDD; and the internal voltage regulator is enabled. When VREN is tied
to AGND this devices operates with both AVDD and DVDD as supplies. The table below shows the modes available at
the various power supply conditions.
DVDD
High
High
Internally
regulated
Low
AVDD
High
Low
High
Low
Pin
VREN
AGND
AGND
AVDD
--
Modes
Supported
All, except
Off
Idle
All, except
Off
Off
Description
Internal voltage regulator: Disabled.
Digital I/O pins: Range from DGND to DVDD.
Device fully functional. Digital logic blocks are
powered from DVDD supply, including all on-
board clocks.
Internal voltage regulator: Disabled.
Digital I/O pins: Range from DGND to DVDD.
Device Measurement functionality not supported.
Device I²C bus and register access supported.
Internal voltage regulator: Enabled
Digital I/O pins: Range from AGND to AVDD
Device fully functional. Digital logic blocks are
powered through on-board regulator.
Device in off mode.
Table 2: Operational Modes and Supply States
Note the continuous current draw versus data update rate in micro-amperes shown in the graph below. Under 10Hz, the
current stays below 1mA.
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