1

8

SC

CS

SO

D14

D15

1

8

D2

D7

TRI-STATE

1

8

SC

CS

SO

D8

D14

D15

11

LM95071

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SNIS137G – AUGUST 2004 – REVISED AUGUST 2019

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Programming (continued)

The receive phase of a communication starts after 16 SC periods. CS can remain low for 32 SC cycles. The

LM95071/LM95071-Q1 will read the data available on the SI/O line on the rising edge of the serial clock. Input

data is to an 8-bit shift register. The part will detect the last eight bits shifted into the register. The receive phase

can last up to 16 SC periods. All ones must be shifted in order to place the part into shutdown. All zeros must be

shifted in order to place the LM95071 into continuous conversion mode. Only the following codes should be

transmitted to the LM95071:

•

00 hex for continuous conversion

•

FF hex for shutdown

Another code may place the part into a test mode. Test modes are used by Texas Instruments to thoroughly test

the function of the LM95071 during production testing. Only eight bits have been defined above since only the

last eight transmitted are detected by the LM95071, before CS is taken HIGH.

The following communication can be used to determine the Manufacturer's/Device ID and then immediately place

the part into continuous conversion mode. With CS continuously low:

•

Read 16 bits of temperature data

•

Write 16 bits of data commanding shutdown

•

Read 16 bits of Manufacture's/Device ID data

•

Write 8 to 16 bits of data commanding Conversion Mode

•

Take CS HIGH.

Note that 228 ms (max) will have to pass for a conversion to complete before the LM95071 actually transmits

temperature data.

8.5.2 Serial Bus Timing Diagrams

Figure 10. Reading Continuous Conversion - Single Eight-Bit Frame

Figure 11. Reading Continuous Conversion - Two Eight-Bit Frames