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ZSC31014 Datasheet(PDF) 35 Page - Integrated Device Technology |
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ZSC31014 Datasheet(HTML) 35 Page - Integrated Device Technology |
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35 / 58 page  ZSC31014 Datasheet © 2016 Integrated Device Technology, Inc. 35 January 20, 2016 3.3.2. SPI Read_DF (Data Fetch) For simplifying explanations and illustrations, only falling edge SPI polarity will be discussed in the following sections. 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 2 nd byte. If the corrected temperature is also required but only at an 8-bit resolution, the read can be terminated after the 3 rd byte is read. Figure 3.8 SPI Output Packet with Falling Edge SPI_Polarity HiZ S1 S0 B13 B12 B7 B6 B0 T10 T9 T1 T0 HiZ … … … … … … SCLK MISO SS Packet = [ {S(1:0),B(13:8)}, {B(7:0)}, {T(10:3)},{T(2:0),xxxxx}] Where S(1:0) = Status bits of packet (normal, command, busy, diagnostic) B(13:8) = Upper 6 bits of 14-bit bridge data. B(7:0) = Lower 8 bits of 14-bit bridge data. T(10:3) = Corrected temperature data (if application does not require corrected temperature, terminate read early) T(2:0),xxxxx =. Remaining bits of corrected temperature data for full 11-bit resolution x |
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