HP206C Datasheet, PDF (14/17 Pages) List of Unclassifed Manufacturers – PRECISION BAROMETER AND ALTIMETER SENSOR

DataSheet
HP206C
in the INT_SRC register but the interrupt will not be output to the INT1 pin.
6.3.10 INT_DIR - (Read-only)
The INT_DIR register allows the user to check the details of the traversal or window interrupt events.
For the T_WIN_DIR and the P_WIN_DIR status bits, when the window interrupts happen, if the temperature
or pressure value is above the window, the corresponding status bit is read as 1; if the value is below the
window, the status bit is read as 0.
For the T_TRAV_DIR and the P_TRAV_DIR status bits, when the traversal interrupts happen, if the
temperature, pressure or altitude value has been rising from low to high, the corresponding status bit is
read as 1; if the value has been falling from high to low, the status bit is read as 0.
Figure 2 shows how the 6 interrupts sources are controlled and mapped to the 2 interrupt output pins. It can
be seen that, the “traversal” and “window” interrupts can only be set high while the corresponding “ready”
interrupts are enabled and set high.
On the other hand, the status of the TH_ERR, DEV_RDY and the four INT_DIR bits are only readable via
registers without interrupt signals output to the pins.
Pressure or Altitude
Ready Interrupt
Pressure or Altitude
Traversal Interrupt
Pressure or Altitude
Window Interrupt
Temperature
Ready Interrupt
Temperature
Traversal Interrupt
Temperature
Window Interrupt
PA_RDY_EN
PA_TRAV_EN
PA_WIN_EN
T_RDY_EN
T_TRAV_EN
T_WIN_EN
PA_RDY_CFG
PA_TRAV_CFG
PA_WIN_CFG
T_RDY_CFG
T_TRAV_CFG
T_WIN_CFG
INT1
Figure 2: Interrupts mapping diagram
6.3.11 INTERRUPTS GENERATION
The T related interrupts are generated as soon as the temperature conversion is finished. This means
that once the external MCU detect the T interrupts, the temperature conversion result is valid to read.
The PA related interrupts are generated as soon as the pressure conversion is finished. This means that
once the external MCU detect the PA interrupts, the pressure conversion result is valid to read.
However, an additional 5 us is required to compute the altitude based on the temperature and pressure
conversion results. Therefore, after detecting the PA interrupts, the MCU must wait another 5 us before
reading the A computation result.
6.3.12 INTERRUPTS CLEARING
The ADC_CVT, READ_PT or READ_AT command will clear the T_RDY and PA_RDY interrupts. Once
the ‘RDY’ interrupt is cleared, the ‘WIN’ and ‘TRAV’ interrupts will be cleared at the same time. However,
the ‘WIN’, ‘TRAV’ and ‘DIR’ register bits will remain their values until a new conversion is done.
The READ_P or READ_A command will only clear the PA_RDY interrupt. The T related interrupt and
register bits will not be changed by these 2 commands.
The READ_T command will only clear the T_RDY interrupt. The PA related interrupt and register bits will
not be changed by this command.
The SOFT_RST will clear all the interrupts as well as the related register bits.
The interrupts are cleared once the device has confirmed a valid command is received. However, this does
not necessarily mean that an interrupt must go low after a command is fully transmitted. For example, while
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