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ADVANCED COMMUNICATIONS & SENSING
USER GUIDE
SX8724SEVK
Evaluation Kit for SX8724S Data Acquisition System
ACS - Revision 1.0 May 2011
© Semtech Corp.
9
USB Interface
9.1
Gateway to SX8724S
The USB gateway is a complete interface to drive the SX8724S on the board. The knowledge, implementation
or modification of this gateway is not required for evaluation.
This interface is used to communicate with the GUI, but can also enable automation with external processes
such as Python, MATLAB, and LabVIEW.
Figure 9. PIC Gateway Schematic
Figure 10. PIC Gateway on the Board
GND
VBOARD
VUSB
RB6
RB4
RC7
OSC2
OSC1
RC5
RC4
RC3
RC2
RC1
RC0
RB5
RB7
PGD/D+
PGC/D-
MCLR/VPP
RC6
VDD
1
RA5/I OCA5/OSC1/CL K IN
2 RA4/AN3/I OCA3/OSC2/CL K OUT
3
RA3/I OCA3/MCL R/VP P
4
RC5/CCP 1/P1A/T0CK I 5
RC4/P 1B/C12OUT/SRQ
6
RC3/AN7/P 1C/C12I N3-/PGM 7
RC6/AN8/SS/T13CK I/T1OSCI
8
RC7/AN9/SDO/T1OSCO
9
RB7/I OCB7/TX/CK
10 RB6/I OCB6/SCK /SCL
11 RB5/AN11/I OCB5/RX/DT
12 RB4/AN10/I OCB4/SDI /SDA
13
RC2/AN6/P 1D/C12IN2-/CVref/I NT2 14
RC1/AN5/C12I N1-/INT1/Vref-
15
RC0/AN4/C12I N+/INT0/Vref+
16
VUSB
17
RA1/I OCA1/D- /PGC
18 RA0/I OCA0/D+/P GD
19
VSS
20
U2
PIC18F14K50-E/SS
2
1
HC49
Y1
22pF
C9
22pF
C10
GND
12 MHz
GND
VUSB
0.47uF
C11
0.1uF
C12
GND
BOOT LOADER
J9
1K
R4
GND
VBOARD
PICKit programmer/debugger interface
Bootloader mode control
PIC gateway
Pin access to the PIC gateway
USB interface
