Digi NS9750 User Manual
Page 67
w w w . d i g i e m b e d d e d . c o m
4 3
N S 9 7 5 0 P i n o u t
I
2
C interface
USB interface
Notes:
If not using the USB interface, these pins should be pulled down to ground
through a 15K ohm resistor.
All output drivers for USB meet the standard USB driver specification.
JTAG interface for ARM core/boundary scan
Note:
trst_n
must be pulsed low to initialize JTAG when a debugger is not
attached. See Figure 9, "JTAG interface," on page 44.
Bits
Signal name
U/D
OD
(mA)
I/O
Description
AC15
iic_scl
4
I/O
I
2
C serial clock line. Add a 10K resistor to
VDDA(3.3V) if not used.
AF16
iic_sda
4
I/O
I
2
C serial data line. Add a 10K resistor to
VDDA(3.3V) if not used.
Table 12: I
2
C interface pinout
Bits
Signal name
U/D
OD
(mA)
I/O
Description
AB4
usb_dm
I/O
USB data -
AC3
usb_dp
I/O
USB data +
Table 13: USB interface pinout
Bits
Signal name
U/D
OD
(mA)
I/O
Description
AE20
tck
I
Test clock
AD18
tdi
U
I
Test data in
Table 14: JTAG interface/boundary scan pinout