Spi Bus For Debug Trace Only; Pin Description; Spi Waveforms - Sierra Wireless WISMO228 Product Technical Specification & Customer Design Manuallines

SPI Bus for Debug Trace ONLY

The WISMO228 provides one SPI bus through the castellation pin.
Caution: This interface is only used for monitoring trace for debug purposes.

Pin Description

The following table provides the pin description of the SPI bus.
Pin # Signal
13 SPI-IO
14 SPI-O
15 SPI-CLK
17 ~SPI-CS
25 SPI-IRQ
An SPI‐to‐UART2 conversion circuit is required to convert the SPI trace to UART2. Also, the SPI‐
IRQ (pin 25) is required for interrupt. Again, note that the SPI interface of the WISMO228 is not
open for application use other than debug trace.

SPI Waveforms

WA_DEV_W228_PTS_002
Table 10. SPI Bus Pin Description
I/O I/O Type Reset State
I/O 2V8 Pull down
O 2V8 Pull down
O 2V8 Pull down
O 2V8 Pull up
I 2V8 Pull down
Figure 7. SPI Timing Diagram
Rev 001
Product Technical Specification &
Customer Design Guidelines
Description
SPI Serial input/output
SPI Serial input
SPI Serial Clock
SPI Enable
SPI Interrupt
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