MS5525DSO Datasheet, PDF (7/22 Pages) TE Connectivity Ltd – Integrated Digital Pressure Sensor

MS5525DSO
(Digital Small Outline)
I²C MODE & ADDRESSING
The external microcontroller clocks in the data through the input SCL (Serial CLock) and SDA (Serial DAta).
The sensor responds on the same pin SDA which is bidirectional for the I²C bus interface. So this interface
type uses only 2 signal lines and does not require a chip select, which can be favorable to reduce board
space. In I²C -Mode the complement of the pin CSB (Chip Select) represents the LSB of the I²C address. It
is possible to use two sensors with two different addresses on the I²C bus. The pin CSB must be connected
to VDD or GND do not leave these pins unconnected.
Pin CSB
High
Low
Address (7 bits)
0x76
0x77
COMMANDS
The MS5525DSO has only five basic commands:
1. Reset
2. Read PROM (128 bit of calibration words)
3. D1 conversion
4. D2 conversion
5. Read ADC result (24 bit pressure / temperature)
Size of each command is 1 byte (8 bits) as described in the table below. After ADC read commands the device will
return 24 bit result and after the PROM read 16bit result. The address of the PROM is embedded inside of the
PROM read command using the Ad2, Ad1 and Ad0 bits.
Command byte
hex value
Bit number
01234567
Bit name
PRM COV - Typ Ad2/ Ad1/ Ad0/ Stop
Os2 Os1 Os0
Command
Reset
0 0 0 1 1 1 1 0 0x1E
Convert D1 (OSR=256) 0 1 0 0 0 0 0 0 0x40
Convert D1 (OSR=512) 0 1 0 0 0 0 1 0 0x42
Convert D1 (OSR=1024) 0 1 0 0 0 1 0 0 0x44
Convert D1 (OSR=2048) 0 1 0 0 0 1 1 0 0x46
Convert D1 (OSR=4096) 0 1 0 0 1 0 0 0 0x48
Convert D2 (OSR=256) 0 1 0 1 0 0 0 0 0x50
Convert D2 (OSR=512) 0 1 0 1 0 0 1 0 0x52
Convert D2 (OSR=1024) 0 1 0 1 0 1 0 0 0x54
Convert D2 (OSR=2048) 0 1 0 1 0 1 1 0 0x56
Convert D2 (OSR=4096) 0 1 0 1 1 0 0 0 0x58
ADC Read
0 0 0 0 0 0 0 0 0x00
PROM Read
1 0 1 0 Ad2 Ad1 Ad0 0 0xA0 to
0xAE
Figure 4: Command
structure
SENSOR SOLUTIONS ///MS5525DSO
09/2016
Page 7