Pni MS2100 User Manual download pdf (Page 6)

PNI Sensor Corporation 133 Aviation Blvd., Suite 101, Santa Rosa, CA 95403-1084 USA;, Fax: (707) 566-2261

For the most current specifications, please visit our website at: www.pnicorp.com DOC # 1011946 R07

21-Jan-11 Page 6 of 16-

MS2100

Specifications & Instructions

SPI Port Line Descriptions

MOSI – Master Out Slave In

The data sent to the MS2100. Data is transferred most significant bit first. The MOSI line will

accept data once the SPI is enabled by taking SSNOT low. Valid data must be presented at least

100 nS before the rising edge of the clock, and remain valid for 100 nS after the edge. New data

may be presented to the MOSI pin on the falling edge of SCLK.

SSNOT – Slave Select Line

Selects the MS2100 as the operating slave device. The SSNOT line must be low prior to data

transfer and must stay low during the entire transfer. Once the command byte is received by the

MS2100, and the MS2100 begins to execute the command, the SSNOT line can be deselected

until the next SPI transfer.

SCLK – Serial Clock

Used to synchronize both the data in and out through the MISO and MOSI lines. SCLK is gener-

ated by a master device. SCLK should be 1 MHz or less. The MS2100 is configured to run as a

slave device, making it an input. One byte of data is exchanged over eight clock cycles. Data is

captured by the master device on the rising edge of SCLK. Data is shifted out and presented to

the MS2100 on the MOSI pin on the falling edge of SCLK.

MISO – Master In Slave Out

The data sent from the MS2100 to the master. Data is transferred most significant bit first. The

MISO line is placed in a high impedance state if the slave is not selected (SSNOT = 1).

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Pni MS2100 User Manual Page 6