HAL82x
DATA SHEET
Sensitivity
GP Register
The SENSITIVITY register contains the parameter for
the multiplier in the DSP. The Sensitivity is program-
mable between −4 and 4. For VDD = 5 V, the register
can be changed in steps of 0.00049.
This register can be used to store some information,
like production date or customer serial number. Micro-
nas will store production Lot number, wafer number
and x,y coordinates in three blocks of this registers.
The total register contains of four blocks with a length
of 13 bit each. The customer can read out this informa-
tion and store it in his own production data base for ref-
erence or he can change them and store own produc-
tion information.
For all calculations, the digital value from the magnetic
field of the D/A converter is used. This digital informa-
tion is readable from the D/A-READOUT register.
ΔVout × 16384
--------------------------------------------------------
SENSITIVITY =
Note: To enable programming of the GP register bit 0
of the MODE register has to be set to 1. This
register is not a guarantee for trace-ability.
2 ΔDA-Readout VDD
VOQ
LOCKR
The VOQ register contains the parameter for the
adder in the DSP. VOQ is the output voltage without
external magnetic field (B = 0 mT) and programmable
from −VDD up to VDD. For VDD = 5 V, the register can
be changed in steps of 4.9 mV.
By setting the first bit of this 2-bit register, all registers
will be locked, and the sensor will no longer respond to
any supply voltage modulation. This bit is active after
the first power-off and power-on sequence after setting
the LOCK bit.
Note: If VOQ is programmed to a negative voltage, the
maximum output voltage is limited to:
Warning: This register cannot be reset!
D/A-READOUT
VOUTmax = VOQ + VDD
This 14-bit register delivers the actual digital value of
the applied magnetic field after the signal processing.
This register can be read out and is the basis for the
calibration procedure of the sensor in the system envi-
ronment.
Clamping Voltage
The output voltage range can be clamped in order to
detect failures like shorts to VDD or GND or an open
circuit.
Note: The MSB and LSB are reversed compared with
all the other registers. Please reverse this regis-
ter after readout.
The CLAMP-LOW register contains the parameter for
the lower limit. The lower clamping voltage is program-
mable between 0 V and VDD/2. For VDD = 5 V, the reg-
ister can be changed in steps of 9.77 mV.
The CLAMP-HIGH register contains the parameter for
the upper limit. The upper clamping voltage is pro-
grammable between 0 V and VDD. For VDD = 5 V, in
steps of 9.77 mV.
10
Feb. 3, 2009; DSH000143_003EN
Micronas
MICRONAS [ MICRONAS ]
