LPS35HW Datasheet, PDF (31/48 Pages) STMicroelectronics – Embedded temperature compensation

LPS35HW
Register description
8
Register description
The device contains a set of registers which are used to control its behavior and to retrieve
pressure and temperature data. The register address, made up of 7 bits, is used to identify
them and to read/write the data through the serial interface.
8.1
INTERRUPT_CFG (0Bh)
Table 16: INTERRUPT_CFG (0Bh) register
7
6
5
4
3
2
1
0
AUTORIFP RESET_ARP AUTOZERO RESET_AZ DIFF_EN LIR PLE PHE
AUTORIFP
AUTORIFP: AutoRifP function enable. Default value: 0. (0: normal mode; 1:AutoRifP
enabled)
RESET_ARP
Reset AutoRifP function. Default value: 0.(0: normal mode; 1: reset AutoRifP
function)
Autozero enable. Default value: 0.
AUTOZERO
(0: normal mode; 1:Autozero enabled)
RESET_AZ
Reset Autozero function. Default value: 0. (0: normal mode; 1: reset Autozero
function)
DIFF_EN
Interrupt generation enable. Default value: 0
(0: interrupt generation disabled; 1: interrupt generation enabled)
LIR
Latch interrupt request to the INT_SOURCE register. Default value: 0. (0: interrupt
request not latched; 1: interrupt request latched)
Enable interrupt generation on differential pressure low event. Default value: 0.(0:
PLE
disable interrupt request; 1: enable interrupt request on measured differential
pressure value lower than preset threshold)
PHE
Enable interrupt generation on differential pressure high event. Default value: 0. (0:
disable interrupt request; 1: enable interrupt request on measured differential
pressure value higher than preset threshold)
To generate an interrupt event based on a user defined threshold, DIFF_EN bit must be set
to '1' and the threshold values stored in THS_P_L (0Ch) and THS_P_H (0Dh).
When DIFF_EN = '1', PHE bit or PLE bit or both bits have to be enabled. PHE and PLE bits
enable the interrupt generation on the positive or negative event respectively.
When DIFF_EN is enabled and AUTOZERO or AUTORIFP is enabled, the defined
pressure threshold values in THS_P (0Ch, 0Dh) is compared with:
P_DIFF_IN=measured pressure - pressure reference
The value of pressure reference is assigned depending on the AUTOZERO and
AUTORIFP modes reported in the next two paragraphs.
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