cef13n5 Hope Microelectronics co., Ltd, cef13n5 Datasheet - Page 6

• Manufacturer Part Number: cef13n5
• Description: Barometer Module
• Manufacturer: Hope Microelectronics co., Ltd

Hope RF
HP03S.doc
BAROMETER MODULE
2006-12-15
Version: 1.1
PRELIMINARY
S: I2C bus START (refer to AT24C02 EEPROM start command)
P: I2C bus STOP (refer to AT24C02 EEPROM stop command)
A (bold): I2C bus acknowledge by slave (SDA pull low: slave send out bit 0)
A: I2C bus acknowledge by master (SDA pull low: master send out bit 0)
N: I2C bus no acknowledge from master (SDA keep high: master send out bit 1 instead)
D : delay for 38ms or above
MSB: conversion result (MSB bit clocked out first)
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).
Like any other semiconductor device, the sensor is sensitive to light. During the
application of this sensor, please keep the sensor in dark place to achieve best accuracy.
Typical Application Circuit Diagram:
6
Tel: [phone] Fax: [phone] E-mail: [e-mail]
http://www.hoperf.com