User manual SAGEM TIGR 350R DATASHEET

[. . . ] Reference Documents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1. 3. Document Modifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1. 4. Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2. Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3. [. . . ] · Asynchronous answer to AT command. Customer's application prior to the read request has configured the GPIO to react to falling/rising edges. The customer application is notified asynchronously by AT command answer when the configured trigger occurs. Note d'étude / Technical document : ­ OTL 5696. 1­ / 72740 Edition 0. 2 HILONC- 3GPS APPLICATION NOTE 01/08/20111 - Page 18 / 34 : Programmable GPIO configurations By utilizing other special AT commands, GPIOs can be used to, for example: 1. Perform I/O toggling while the module is attached to the network. Perform I/O toggling when a pre-set temperature is reached. Serve as an input to detect the presence of an antenna (with some additional external power. ) 4. GPIO2 serves as an input default to detect SIM card presence . . . etc. 3. 7 ADC The TIGR 350R has one ADC input pin which can be used to read the value of the voltage applied. The following conditions must be met to ensure correct performance: · Input signal voltage must be within 0V to 2. 1V. · Input impedance of the pin is 2K . · Input capacitance typically is 53pF. The AT command AT+KADC will produce a voltage value with the following characteristics: · 15 bits resolution · Maximum sampling frequency of 2. 4MHz. 3. 8 Backup Battery 3. 8. 1 Backup Battery Function Features A backup battery can be connected to the module in order to back-up content of some internal PMIC registers when the main power supply is disconnected. After a few seconds, the UART_RTS enters active state and the module is ready to receive AT commands. VGPIO is a supply output from the module that can be used to check if the module is active. · When VGPIO = 0V the module is OFF. · When VGPIO = 2. 85V the module is ON. TBD : Power on sequence TBD : Power off sequence Send AT COMMAND "AT+CPOF" to power off module. 4. 2. 1. 1 IO DC Presence before Power on When VBAT is available but the module has not yet powered up, the following I/O's raise their output. VBACKUP raise to 3V PWON raise to 1. 8V 4. 3 Power on and Sleep Diagrams The 2 diagrams below show the behavior of the module and the DTE during power on and then in sleep modes. Note: the module cannot enter sleep mode if USB bus is connected. TBD : Diagram for power on TBD : Diagram for sleep mode Note d'étude / Technical document : ­ OTL 5696. 1­ / 72740 Edition 0. 2 HILONC- 3GPS APPLICATION NOTE 01/08/20111 - Page 21 / 34 4. 4 Module Power off 4. 4. 1 UART Interface To turn the module off, use the AT command AT+CPOF. If PWON is not pulled down the module will switch to OFF mode after the AT command, otherwise the module restarts immediately (OFF sequence is performed followed by power ON sequence). : Power off sequence for PWON, VGPIO and UART_RTS 4. 4. 2 USB Interface As the module can also be turned on when a USB cable is plugged in, the module turn off sequence requires the USB interface to be OFF or VBUS disconnected once the command is sent and acknowledged by the module. Thus, to turn the module off when USB interface is in use, use the AT command AT+CPOF, then disconnect VBUS signal (unplug the USB cable or use a command switch to switch off VBUS) when the module acknowledges (responds with an OK message) the command, otherwise the module will restart immediately (an OFF sequence is performed followed by a power ON sequence). 4. 5 Sleep Mode The AT command AT+KSLEEP allows configuration of the sleep mode. When AT+KSLEEP=1 has been configured: · The TIGR 350R module decides by itself when to enter sleep mode (no tasks running). [. . . ] Grounding of components should be connected to the ground layer through a number of irregularly distributed vias. Top and bottom layer should set aside as much space for the ground plane as possible. Flood remaining empty surfaces of the layout of those two layers with a ground plane connected to the main ground through as many vias as possible. 8. 1. 1. 1 Ground layout guidelines Proper grounding is crucial to end-product performance. At least one layer must be a dedicated ground plane. [. . . ]