LPS25HB Spec Discrepencies

[imelhuish]

Posted on April 21, 2016 at 16:57

DoclD027112 Rev2.

Description for CTRL_REG1 in Register description 8.6 DIFF_EN - Interrupt generation enable. Default value: 0 (0: interrupt generation disabled; 1: interrupt generation enabled)  Text description is: The DIFF_EN bit is used to enable the computing of differential pressure output. It is recommended to enable DIFF_EN after the configuration of REF_P_H (0Ah), REF_P_L (09h), REF_P_XL (08h), THS_P_H (31h) and THS_P_L (30h). Question: Is this bit a DIFF_EN or is it an Interrupt Enable? Description for CTRL_REG2 in Register description 8.7 FIFO_MEAN_-DEC - Register address automatically incremented during a multiple byte access with a serial interface (I 2 C or SPI). Default value 1. (0: disable; 1 enable) There is no text description of the bit. Question: Is this bit related to the FIFO operation in any way (as the bit name implies) or is it simply a register addr increment for the serial bus access?

[licciardello.anto]

Posted on May 11, 2016 at 11:21

Hi,

1.

DIFF_EN bit is used to enable the computing of differential pressure output. The pressure output value PRESS_OUT will contain the Reference pressure value data (REF_P) subtracted from the sensor output measurement. The reference pressure value is subtracted from the sensor output measurement, to detect a measured pressure beyond programmed limits ( THS_P). In order to enable the pressure interrupt, you have to configure the CTRL_REG3 (0x22h) too. So in order to enable the interrupt generation you have to enable DIFF_EN bit and configure CTRL_REG3 (see table 20 on datasheet).

2.

Sorry, the FIFO_MEAN_-DEC bit description is not correct. Pls, See section 4.6 on datasheet for explanation of this bit. We are going to correct the datasheet for the next review. Regards Antonella