Usb To I2C Bridging Dongle; Table 4. Usb-To-I2C Bridging Dongle P2 Connector; Figure 5. Usb-To-I2C Bridging Dongle Top View; Figure 6. Usb-To-I2C Bridging Dongle Schematic - ST STEVAL-ISB68WA User Manual

2

USB to I2C bridging dongle

Overview
The USB to I2C bridging dongle is the tool that allows interfacing the receiver to the Graphical User Interface
running on a PC. The P2 connector signals are summarized in
bridge: D1 (green) indicates I2C bus activity, D2 (red) indicates correct initialization of the U1 chip and D3 (yellow)
is a power-on indicator. When the dongle is plugged into the USB port, both D2 and D3 should be on.
1
A
U1
MCP_RSTB 1
GP0
MCP_INTB 2
GP1
RST 3
RST VUSB
4
URx
MCP2221
B
S1
C6 D3
SW-SPST
100nF LED
R5
470R
GND GND
C
Pin
1
2
D
3
4
1
5
UM2693 - Rev 1
Figure 5. USB-to-I2C bridging dongle top view
2
Figure 6. USB-to-I2C bridging dongle schematic
GND
U3
12
D+ 1
11 I/O1
D- 2
10 GND
3
9 SCL I/O2
SCL
C4 USBCL6-2
470nF
GND
GND
D1
D2
LED
LED
R2
I2C communication
4k7
R6
R7
220R
220R
VDD
Table 4. USB-to-I2C bridging dongle P2 connector
Signal
GND
SDA
SCL
INTB
2
RSTB
Table 4. Three LEDs monitor the operation of the
F1
VBUS
Littelfuse 0603L025
6
I/O1
5
VBUS
4
I/O2
C5 R1
100nF 1M
GND GND GND
R9
4k7
RSTB
R3 R4
Q1
4k7 4k7
MCP_RSTB
1 G FDV303N
R8
100k
GND
Common return (ground)
I2C bus, SDA line
I2C bus, SCL line
I/O line dedicated to INT pin management (status reading)
Reset signal for the STWLC68JRH chip, active low. Not used in the receiver
USB to I2C bridging dongle
3
P1
1
VBUS
2
D-
3
D+
D4
4
ID
5 VBUS
GND
Shell STPS1L60ZFY
Shield
MicroUSB
U2
VBUS 1
VIN VOUT
3
INHIBIT
C1 C2
LD2981
1uF
100nF
GND GND
GND
Description
Title
STEVAL-USBI2C
Size Number
A4
Date: 14.2.2020
File: C:\Projects\..\STEVAL-ISB68I2C.SchDoc Drawn By:
3
module.
UM2693
4
A
P2
GND
1
SDA
2
SCL
3
MCP_INTB
4
RSTB
5
6
Header connector
B
5 VDD
4
NC
C3
2.2uF
GND
C
D
Revision
Sheet of
4
page 6/18