User's Manual

Cinterion
®
ELS61-US Hardware Interface Overview
2.1 Application Interface
21
 ELS61-US_HIO_v00.281 2016-02-11
Confidential / Preliminary
Page 15 of 40
2.1.5 GPIO Interface
ELS61-US offers a GPIO interface with 22 GPIO lines. The GPIO lines are shared with other
interfaces or functions: Fast shutdown (see Section 2.2.4), status LED (see Section 2.2.3), the
PWM functionality (see Section 2.2.1), an pulse counter (see Section 2.2.2), ASC0 (see Sec-
tion 2.1.2), ASC1 (see Section 2.1.3), an SPI interface (see Section 2.2).
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.
After startup, the above mentioned alternative GPIO line assignments can be configured using
AT commands (see [1]). The configuration is non-volatile and available after module restart.
Table 2: GPIO lines and possible alternative assignment
GPIO Fast Shutdown Status LED PWM Pulse Counter ASC0 ASC1 SPI
GPIO1 DTR0
GPIO2 DCD0
GPIO3 DSR0 SPI_CLK
GPIO4 FST_SHDN
GPIO5 Status LED
GPIO6 PWM2
GPIO7 PWM1
GPIO8 COUNTER
GPIO11
GPIO12
GPIO13
GPIO14
GPIO15
GPIO16 RXD1 MOSI
GPIO17 TXD1 MISO
GPIO18 RTS1
GPIO19 CTS1 SPI_CS
GPIO20
GPIO21
GPIO22
GPIO23
GPIO24 RING0