Pni Legacy Comm Board Bedienungsanleitung PDF herunterladen (Seite 29)

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SPI INTERFACE TO SENSOR MODULE

Table 14: SPI Pin Descriptions

Pin Name Description

1 SCLK Serial clock output for the SPI port

2 MISO Serial data input. Master In Slave Out

3 MOSI Serial data output. Master Out Slave In

4 SSNOT Active low chip select for SPI port

5 DRDY Data ready input (not supported by V2Xe module)

6 SYNC Sync output

7 GND Ground

8 GIO0 Reserved I/O

9 GIO1 Reserved I/O

10 GIO2 Reserved I/O

11 GIO3 Reserved I/O

12 VDD Supply voltage, 3 VDC regulated

13 VCC Unregulated CommBoard input supply voltage

14 GND Ground

SPI Port Pin Descriptions

MOSI – Master Out Slave In

The data sent from the CommBoard. 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 module 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 module, and the module

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 generated by the

CommBoard. SCLK should be 1 MHz or less. The CommBoard is configured to run as a master device,

making it an output. One byte of data is exchanged over eight clock cycles. Data is captured by the

CommBoard on the rising edge of SCLK. Data is shifted out and presented to the module on the MOSI pin

on the falling edge of SCLK.

MISO – Master In Slave Out

The data sent from the module to the CommBoard. 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).

CommBoard

SPI Interface to Sensor Module

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Pni Legacy Comm Board Bedienungsanleitung Seite 29