User Manual
Table Of Contents
- Contents
- Tables
- Figures
- 1 Introduction
- 2 Interface Characteristics
- 2.1 Application Interface
- 2.2 RF Antenna Interface
- 2.3 Sample Application
- 3 Operating Characteristics
- 4 Mechanical Dimensions, Mounting and Packaging
- 5 Regulatory and Type Approval Information
- 6 Document Information
- 7 Appendix
Cinterion
®
ELS31-V/ELS51-V Hardware Interface Overview
2.1 Application Interface
17
ELS31-V_ELS51-V_HIO_v00.502 2015-12-07
Confidential / Preliminary
Page 11 of 35
2.1.5 GPIO Interface
ELS31-V / ELS51-V offers a GPIO interface with 17 GPIO and 3 GPO lines. The lines are
shared with other interfaces or functions: Fast shutdown (see Section 2.1.11.2), status LED
(see Section 2.1.11.1), a pulse counter (see Section 2.1.8), ASC0 (see Section 2.1.2), ASC1
(see Section 2.1.3), SPI (see Section 2.1.7), and HSIC (see Section 2.1.9).
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.
Notes:
• GPO5, GPO23 and GPO26 are GPOs only.
Table 2: GPIO lines and possible alternative assignment
GPIO Fast
Shutdown
Status
LED
Pulse
Counter
ASC0 ASC1 SPI HSIC
GPIO1 DTR0
GPIO2 DCD0
GPIO3 DSR0
GPIO4 FST_SHDN
GPO5 LED
GPIO6
GPIO7
GPIO8 COUNTER
GPIO16 RXD1 AP_WAKEUP
GPIO17 TXD1 HOST_ACTIVE
GPIO18 RTS1 CP_WAKEUP
GPIO19 CTS1 SUSPEND
GPIO20
GPIO21
GPIO22
GPO23
GPIO24 RING0
GPIO25
GPO26 SPI_CS1
GPIO27 SPI_CS2