Specifications

Cinterion
®
BGS5 Hardware Interface Overview
2.1 Application Interface
23
 BGS5_HID_v00.341 2013-09-23
Confidential / Preliminary
Page 17 of 41
2.1.5 Digital Audio Interface
Four BGS5 GPIO interface lines can be configured a digital audio interface (DAI). The DAI can
be used to connect audio devices capable of pulse code modulation (PCM).
2.1.6 GPIO Interface
BGS5 offers a GPIO interface with 17 GPIO lines. The GPIO lines are shared with other inter-
faces resp. functions.
The following table shows the configuration variants for the GPIO pads. All variants are mutu-
ally exclusive, i.e. a pad configured for instance as Status LED is locked for alternative usage.
When the BGS5 starts up, all GPIO lines (except GPIO1-GPIO3 and GPIO24) are set to high-
impedance state after initializing. Therefore, it is recommended to connect external pull-up or
pull-down resistors to those GPIO lines that are to be used as output. This is necessary to keep
these lines from floating or driving any external devices.
Table 2: GPIO lines and possible alternative assignment
GPIO Fast
Shutdown
Status
LED
PWM Pulse
Counter
ASC0 ASC1 SPI PCM
GPIO1 DSR0
GPIO2 DTR0
GPIO3 DCD0
GPIO4 FST_SHDN
GPIO5 Status LED
GPIO6 PWM2
GPIO7 PWM1
GPIO8 COUNTER
GPIO16 RXD1 MOSI
GPIO17 TXD1 MISO
GPIO18 RTS1 SPI_CLK
GPIO19 CTS1 SPI_CS
GPIO20 TXDDAI
GPIO21 RXDDAI
GPIO22 TFSDAI
GPIO23 SCLK
GPIO24 RING0