HMC5843 Honeywell Microelectronics & Precision Sensors, HMC5843 Datasheet - Page 17

• Manufacturer Part Number: HMC5843
• Description: Magnetic Sensor
• Manufacturer: Honeywell Microelectronics & Precision Sensors

Specifications of HMC5843

• Msl: MSL 3 - 168 Hours
• Sensitivity Range: +/- 10 %
• Sensor Terminals: PCB
• Magnetic Field Max: 4G
• Axis Configuration: Three
• Sensor Output: Digital

HMC5843
Mode Register
The mode register is an 8-bit register from which data can be read or to which data can be written. This register is used to
select the operating mode of the device. MR0 through MR7 indicate bit locations, with MR denoting the bits that are in the
mode register. MR7 denotes the first bit of the data stream. The number in parenthesis indicates the default value of that
bit.
Data Output X Registers A and B
The data output X registers are two 8 -bit registers, data output register A and data output register B. These registers
store the measurement result from channel X. Data output X register A contains the MSB from the measurement result,
and data output X register B contains the LSB from the measurement result. The value stored in these two registers is a
16-bit value in 2’s complement form, whose range is 0xF800 to 0x07FF. DXRA0 through DXRA7 and DXRB0 through
DXRB7 indicate bit locations, with DXRA and DXRB denoting the bits that are in the data output X registers. DXRA7 and
DXRB7 denote the first bit of the data stream. The number in parenthesis indicates the default value of that bit.
In the event the ADC reading overflows or underflows for the given channel, or if there is a math overflow during the bias
measurement, this data register will contain the value -4096 in 2’s complement form. This register value will clear when
after the next valid measurement is made.
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MR7
(0)
Location
MR7 to
MR2
MR1 to
MR0
MD1
0
0
1
1
MR6
(0)
MD0
0
1
0
1
Name
0
MD1 to
MD0
Mode
Continuous-Conversion Mode. In continuous-conversion mode, the
device continuously performs conversions an places the result in the
data register. RDY goes high when new data is placed in all three
registers. After a power-on or a write to the mode or configuration
register, the first measurement set is available from all three data
output registers after a period of 2/f
measurements are available at a frequency of f
frequency of data output.
Single-Conversion Mode. When single-conversion mode is selected,
device performs a single measurement, sets RDY high and returned
to sleep mode. Mode register returns to sleep mode bit values. The
measurement remains in the data output register and RDY remains
high until the data output register is read or another conversion is
performed.
Idle Mode. Device is placed in idle mode.
Sleep Mode. Device is placed in sleep mode.
Table 15: Mode Register Bit Designations
MR5
(0)
Description
These bits must be cleared for correct operation.
Mode Select Bits. These bits select the operation mode of
this device.
Table 16: Operating Modes
Table 14: Mode Register
MR4
(0)
MR3
(0)
DO
MR2
(0)
and subsequent
DO
MR1
MD1 (1)
, where f
DO
MR0
MD0 (0)
is the
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