HP203B Datasheet, PDF (9/18 Pages) List of Unclassifed Manufacturers – PRECISION BAROMETER AND ALTIMETER SENSOR

DataSheet
HP203B
5.2 I²C Device and Register Address
The I²C device address is shown below. The LSB of the device address is determined by the status of
the CSB pin:
CSB PIN=0: corresponding to address 0XEE (write) and 0XEF (read).
CSB PIN=1: corresponding to address 0XEC (write) and 0XED (read).
A7 A6 A5 A4 A3 A2
A1
W/R
111011
CSB =0 : 1
CSB =1 : 0
0/1
5.3 I²C Protocol
The 1^st TYPE: the host issuing a single byte command to the device
The host shall issue the Device Address (ID) followed by a Write Bit before sending a Command byte.
The device will reply an ACK after it received a correct SOFT_RST command.
1
1
1
0
1
1
/CS
B
0
0
0
0
0
0
0
1
1
0
0
S
Device Address
WA
Command
AP
The 2nd TYPE: the host writing a register inside the device
The host shall issue the Device Address (ID) followed by a Write Bit before sending a command byte
and a data byte. This format only applies while the user wants to send the WRITE_REG command.
1 1 1 0 1 1 /CSB 0 0 1 1 0 0 1 0 1 0 0 0 0 0 0 0 1 1 0 0
S
Device Address W A
Command
A
Data
AP
The 3rd TYPE: the host reading a register from the device
In this activity there are two frames that are sent separately. The first frame is to send the
READ_REG command which contains a 2-bit binary number of 10 followed by a 6-bit register
address. The format of the first frame is identical to the 1^st type activity. In the second frame, the
device will send back the register data after receiving the correct device address followed by a read
bit. This format only applies while the user wants to use the READ_REG command.
1 1 1 0 1 1 /CSB 0 0 1 0 0 0 0 1 1 0 0
S
Device Address W A Command
AP
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