Hope RF

HP02S

BAROMETER MODULE

2011-6-8

Version: 1.4

5

LSB: conversion result (MSB bit clocked out first).

Remark:

Before start an AD conversion cycle, remember to set XCLR pin high so that the system

is no longer in the reset state.

All data read from the module is in hex format.

After first power on, the first read data should be disregarded, and only the second value

be used. This can assure that unstable reading after power on reset can be filtered out.

For altitude calculation purpose, use averaging scheme to improve the stability of

pressure reading, we recommend making at least 8 times averaging so that it is possible to

achieve 0.3m accuracy (about 1 foot).

Typical Application Circuit Diagram:

Remark：

In the battery supply product this application need be changed as:

32 KHz signal is outputted via the port of the MCU instead of the 32.768 KHz crystal to

MCLK pin. The MCU will not output 32 KHz signal and keep low level when the

HP02S enter to standby mode.