HMC5843 Datasheet, PDF (16/19 Pages) Honeywell Solid State Electronics Center – 3-Axis Digital Compass IC

HMC5843
Location Name Description
SR7 to
SR3
0
SR2
REN
These bits must be cleared for correct operation.
Regulator Enabled Bit. This bit is set when the internal
voltage regulator is enabled. This bit is cleared when the
internal regulator is disabled.
SR1
SR0
Identification Register A
LOCK
RDY
Data output register lock. This bit is set when this some but
not all for of the six data output registers have been read.
When this bit is set, the six data output registers are locked
and any new data will not be placed in these register until
on of four conditions are met: one, all six have been read
or the mode changed, two, a POR is issued, three, the
mode is changed, or four, the measurement is changed.
Ready Bit. Set when data is written to all six data registers.
Cleared when device initiates a write to the data output
registers, when in off mode, and after one or more of the
data output registers are written to. When RDY bit is clear
it shall remain cleared for a minimum of 5 µs. DRDY pin
can be used as an alternative to the status register for
monitoring the device for conversion data.
Table 21: Status Register Bit Designations
The identification register A is used to identify the device. IRA0 through IRA7 indicate bit locations, with IRA denoting the
bits that are in the identification register A. IRA7 denotes the first bit of the data stream. The number in parenthesis
indicates the default value of that bit.
The identification value for this device is stored in this register. This is a read-only register.
Register values. ASCII value H
IRA7 IRA6
IRA5
IRA4
IRA3
IRA2
IRA1
0
1
0
0
1
0
0
Table 22: Identification Register A Default Values
IRA0
0
16
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