Pni MS2100 Manuel d'utilisateur télécharger pdf (Page 8)

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21-Jan-11 Page 8 of 16-

MS2100

Specifications & Instructions

OPERATION

Basic operation will follow these steps. Refer to Figure 2 and Figure 3.

1. SSNOT is brought low.

2. Pulse RESET high (return to low state). You must RESET the MS2100 before every

measurement.

3. Data is clocked in on the MOSI line. Once eight bits are read in, the MS2100 will execute the

command.

4. The MS2100 will make the measurement. A measurement consists of forward biasing the sensor

and making period count; then reverse biasing the sensor and counting again; and finally, taking

the difference between the two bias directions.

5. At the end of the measurement, the DRDY line is set to high indicating that the data is ready. In

response to the next 16 SCLK pulses, data is shifted out on the MISO line.

If you need to make another measurement, go to Step 2. You can send another command after the reset. In

this case, keep SSNOT low. If you will not be using the MS2100, set SSNOT to high to disable the SPI

port.

Figure 2: SPI Port Full Timing Sequence (cpol=0)

Figure 3: SPI Port Timing Parameters (cpol = 0)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

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Pni MS2100 Manuel d'utilisateur Page 8