cef13n5 Hope Microelectronics co., Ltd, cef13n5 Datasheet - Page 5

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

Hope RF
2006-12-15
Serial Interface
The I2C interface is used for accessing calibration data as well as reading measurement
result from AD conversion.
The HP03SA system has a 2k bits (256*8) EEPROM built in, and the space in the range
of 16 to 127 were dedicated for calibration coefficients and factory testing use only. Any
accidental corruption to those data will lead to system failure and can lead to wrong
calculated pressure and temperature results (write protection solder option is
available, default setting: write protected).
Reading Calibration Factor C1 to C7:
The EEPROM chip address is set to 0, and reading or writing of the EEPROM is fully
compatible to AT24C02. Bus drive timing should be referred to the specification of this
part.
Coefficient
C1(MSB:LSB)
C2(MSB:LSB)
C3(MSB:LSB)
C4(MSB:LSB)
C5(MSB:LSB)
C6(MSB:LSB)
C7(MSB:LSB)
Reading Temperature and Pressure value:D1,D2
AD chip I2C address is set to 0xEE (device write address), 0xEF (device read
address). In order to get the AD value D1 and D2, you have to follow the following
timing sequence:
Pressure Measure:
Select pressure measurement
Temperature Measure:
S 11101110
Select temperature measurement
S 11101110
Tel: [phone] Fax: [phone] E-mail: [e-mail]
A
A
11111111
11111111
BAROMETER MODULE
EEPROM ADDRESS(decimal)
A
A
11110000
11101000
(16:17)
(18:19)
(20:21)
(22:23)
(24:25)
(26:27)
(28:29)
PRELIMINARY
A
A
P D S 11101110
P D S 11101110
Read AD value back
Read AD value back
A
A
11111101
11111101
http://www.hoperf.com
A
A
S 11101111
S 11101111
Version: 1.1
HP03S.doc
A
A
MSB
MSB
5
A
A
LSB
LSB
N P
N P