ms4525do Measurement Specialties, ms4525do Datasheet - Page 15

• Manufacturer Part Number: ms4525do
• Description: Pcb Mounted Pressure Transducers
• Manufacturer: Measurement Specialties

MS4525DO
2. SPI interface Specification
The SPI interface of sensor must be programmed for falling-edge MISO change.
2.1 SPI Read_DF (Data Fetch)
The SPI interface will have data change after the falling edge of SCLK. The master should sample MISO on the
rise of SCLK. The entire output packet is 4 bytes (32 bits). The high bridge data byte comes first, followed by the
low bridge data byte. Then 11 bits of corrected temperature (T[10:0]) are sent: first the T[10:3]byte and then the
{T[2:0],xxxxx} byte. The last 5 bits of the final byte are undetermined and should be masked off in the application.
If the user only requires the corrected bridge value, the read can be terminated after the 2nd byte. If the
corrected temperature is also required but only at an 8-bit resolution, the read can be terminated after the 3rd
byte is read.
Figure 2.2 – SPI Output Packet with Falling Edge SPI_Polarity
MS4525DO
www.meas-spec.com
January 2011
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