Telit Wireless Solutions BlueMod+S50/AI, Hardware User'S Manual

Page: 26 / 53

S50 Hardware User Guide
1VV0301505 Rev. 1 Page 26 of 53 2018-03-02
Firmware depend Functions
Signal
CEN
Type
(1)
Function
GPIO[0] DIS none
GPIO[1] DIS none
GPIO[2] DIS none
GPIO[3] O IOB
GPIO[4] I-PU HANGUP
GPIO[5] DIS none
GPIO[6] DIS none
GPIO[7] DIS none
GPIO[8] O IOA
GPIO[9] DIS none
GPIO[10] DIS none
GPIO[11] DIS none
GPIO[12] DIS none
GPIO[13] DIS none
GPIO[14] DIS none
(1)
I: Input; O: Output; I/O: bidir; PU: pull-up; PD: pull-down; DIS: disconnected; PP: push-pull;
Table 7: Firmware depend GPIO function
Handling of Unused Signals
Depending on the application, not all signals of S50 may be needed. The
following list gives some hints how to handle unused signals.
Signal Handling
EXT-RES# If no external Reset is needed: Leave open
UART-RXD add a pullup (e.g.100k
Ω
) to VSUP
(1)
UART-TXD leave UART-TXD open
(1)
UART-RTS#, UART-CTS# If neither flow control nor UICP is used: Leave open
(1)(2)
IUR-OUT#, IUR-IN# If UICP is not used: leave open
TESTMODE# Leave open
(1)
unused GPIOs Leave open
SWDIO, SWCLK Leave open. Only needed for debug purposes
(1)
Signals must be accessible for regulatory approving
(2)
It is strongly recommended to use hardware flow control in both directions. Not using flow control can cause loss of data.
Table 8: Handling of Unused Signals