HAL805-1 Datasheet, PDF (29/30 Pages) Micronas – Programmable Linear Hall-Effect Sensor

DATA SHEET
HAL 805
5.5. Register Information
CLAMP-LOW
– The register range is from 0 up to 1023.
– The register value is calculated by:
Low Clamping Voltage
CLAMP-LOW =
V_DD
* 2048
CLAMP-HIGH
– The register range is from 0 up to 2047.
– The register value is calculated by:
High Clamping Voltage
CLAMP-HIGH =
V_DD
* 2048
VOQ
– The register range is from −1024 up to 1023.
– The register value is calculated by:
VOQ =
V_OQ
V_DD
* 1024
SENSITIVITY
– The register range is from −8192 up to 8191.
– The register value is calculated by:
SENSITIVITY = Sensitivity * 2048
TC and TCSQ
– The TC register range is from −31 up to 31.
– The TCSQ register range is from 0 up to 31.
Please refer Section 4.2. on page 23 for the recom-
mended values.
MODE
– The register range is from 0 up to 63 and contains
the settings for FILTER and RANGE:
MODE = FILTER * 8 + RANGE
Please refer Section 2.2. on page 8 for the available
FILTER and RANGE values.
ADC-READOUT
– This register is read only.
– The register range is from −8192 up to 8191.
DEACTIVATE
– This register can only be written.
– The register has to be written with 2063 decimal
(80F hexadecimal) for the deactivation.
– The sensor can be reset with an Activate pulse on
the output pin or by switching off and on the supply
voltage.
5.6. Programming Information
If the content of any register (except the lock registers)
is to be changed, the desired value must first be writ-
ten into the corresponding RAM register. Before read-
ing out the RAM register again, the register value must
be permanently stored in the EEPROM.
Permanently storing a value in the EEPROM is done
by first sending an ERASE command followed by
sending a PROM command. The address within the
ERASE and PROM commands is not important.
ERASE and PROM act on all registers in parallel.
If all HAL805 registers are to be changed, all writing
commands can be sent one after the other, followed by
sending one ERASE and PROM command at the end.
During all communication sequences, the customer
has to check if the communication with the sensor was
successful. This means that the acknowledge and the
parity bits sent by the sensor have to be checked by
the customer. If the Micronas programmer board is
used, the customer has to check the error flags sent
from the programmer board.
Note: For production and qualification tests, it is man-
datory to set the LOCK bit after final adjustment
and programming of HAL805. The LOCK func-
tion is active after the next power-up of the sen-
sor. Micronas also recommends sending an
additional ERASE command after sending the
LOCK command.
The success of the Lock Process should be
checked by reading at least one sensor register
after locking and/or by an analog check of the
sensors output signal.
Electrostatic Discharges (ESD) may disturb the
programming pulses. Please take precautions
against ESD.
Micronas
Feb. 14, 2006; 6251-513-3DS
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