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HP203B Datasheet(PDF) 15 Page - List of Unclassifed Manufacturers
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HP203B Datasheet(HTML) 15 Page - List of Unclassifed Manufacturers
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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.
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
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
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