S50 Hardware User Guide
1VV0301505 Rev. 3
Page 29 of 60
2021-05-05
Not Subject to NDA
(3)
signals sampled only at startup time, I-DIS otherwise
(4)
Pin Type depends on UICP status. Refer to 4.3.4
Table 7: Pin Assignments
5.3.
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 8: Firmware depend GPIO function
5.4.
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
