Vaisala Barocap PMB100, User Manual

Page: 13 / 16

A
PPENDIX
A _______________________________________ R
EADING COEFFICIENTS FROM THE EEPROM
V
AISALA
_________________________________________________________________________ 13
APPENDIX A
READING COEFFICIENTS FROM THE
EEPROM
The PMB100 module has a Xicor's
EEPROM
memory, type X24C02,
which uses the I
2
C interface. All the pressure and temperature related
coefficients are stored in the memory in form of 32 bit, and can be
read by a microprocessor (see Table 1). The pin assignments are as
shown in Figure 2 on page 7. Detailed instructions of the
EEPROM
are
found on Xicor's web pages ( http://www.xicor.com/ ).
NOTE EEPROM can not be read if the shut down is active (ON).
Table 1
EEPROM
memory map
Name Symbol Type Length Memory
address Range
[Bit] [Byte]
Product code PCode 8-bit int 8 0 [0...256]
Serial number Sno 32 1 - 4
Calibration date Date 24 5 - 7
Scaling factor k 8-bit int 8 8 [0...256]
Normalized room
temperature
T
0
32-bit int 32 10 - 13 [-1...1]
Normalized coefficients a
00
32-bit int 32 14 - 17 [-1...1]
a
10
32-bit int 32 18 21 [-1...1]
a
20
32-bit int 32 22 25 [-1...1]
a
30
32-bit int 32 26 29 [-1...1]
a
01
32-bit int 32 30 33 [-1...1]
a
02
32-bit int 32 34 37 [-1...1]
a
11
32-bit int 32 38 41 [-1...1]
a
21
32-bit int 32 42 45 [-1...1]
a
31
32-bit int 32 46 49 [-1...1]
a
12
32-bit int 32 50 53 [-1...1]