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SARA-R5 Datasheet(PDF) 14 Page - u-blox AG |
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SARA-R5 Datasheet(HTML) 14 Page - u-blox AG |
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14 / 43 page  SARA-R5 series - Data sheet UBX-19016638 - R06 Interfaces Page 14 of 43 C1-Public 2.3.3 Module reset SARA-R5 series modules can be reset (re-booted), saving current parameter settings in the module’s non-volatile memory and performing a proper network detach, by: AT+CFUN command (see the SARA-R5 series AT commands manual [1]). This causes a graceful software reset of the module. An abrupt software reset of the module is executed by applying a low pulse at the RESET_N input pin, which is normally set high by an internal pull-up, for a valid time period (see section 4.2.7). The current parameter settings are not saved in the module’s non-volatile memory and a proper network detach is not performed. The RESET_N line is intended to be driven by open drain, open collector or contact switch. ☞ It is recommended to provide accessible test point directly connected to the RESET_N input pin. An abrupt emergency hardware reset of the modules, without storage of the current parameter settings in the module’s non-volatile memory and without proper network detach procedure, can be triggered by: Forcing a low pulse at the PWR_ON input pin, for a valid time period (see section 4.2.6, module abrupt emergency hardware reset) 2.4 SIM 2.4.1 SIM interface SARA-R5 series modules provide on the VSIM, SIM_IO, SIM_CLK, SIM_RST pins an interface to connect an external SIM card/chip. Both 1.8 V and 3.0 V SIM types are supported. Activation and deactivation with an automatic voltage switch from 1.8 V to 3.0 V is implemented according to the ISO-IEC 7816-3 specifications. 2.4.2 SIM detection The GPIO5 pin of SARA-R5 series modules is a 1.8 V digital input which can be configured as an external interrupt to detect the SIM card presence (as a feature which can be optionally used), as intended to be properly connected to the mechanical switch of an external SIM card holder. For more details, see the SARA-R5 series system integration manual [2] and the SARA-R5 series AT commands manual [1]. 2.5 Serial communication The SARA-R5 series provides the following serial communication interfaces: UART interfaces, available for communications with host application processor (2.5.1) USB 2.0 compliant interface, available for diagnostics only (2.5.2) SPI interfaces, available for communications with external SPI devices and for diagnostic (2.5.3) SDIO interface, available for communications with external SDIO devices (2.5.4) DDC (I2C bus compatible) interface, available for communications with external I2C devices (2.5.5) |
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