u-blox LEA-5 Series - Page 20

LEA-5, NEO-5, TIM-5H - Hardware Integration Manual
GPS.G5-MS5-09027-A2 Released Hardware description
Page 20 of 68
u-blox GPS Receiver SPI Master
SSN_N
MISO
SCS_N
MI
VDD
MOMOSI
SCK SCK
VDD
Figure 11: Connecting to SPI Master
1.5.4.4 SPI and u-blox 5 configuration pins
With some u-blox 5 modules the SPI MOSI, MISO and SCK pins have a shared configuration function at start up.
To secure correct receiver operation make sure that the SS_N pin is high at start up. Afterwards the SPI function
will not affect the configuration pins.