Default Jumpers
USB2ANY
3
5
7
2
4
6
8
3
5
7
2
4
6
8
J5
J4
J3
1
1
SCL
SDA
GND
+3.3_EXT
TCA9802EVM
Oscilloscope Probe
I
2
C Master
I
2
C
S
lav
e
s
2
1
4
3
6
5
8
7
1
0
9
Layout
10
SLVUB32 – March 2017
Copyright © 2017, Texas Instruments Incorporated
TCA9802 I
2
C Buffer Evaluation Module
4.1
Setup
This section describes the setup and operation of the EVM for evaluation performance.
shows
the configuration for operating the TCA9802 I
2
C buffer using a USB2ANY. An oscilloscope can be
connected directly to J1 or the SDA and SCL pins on J5 and J6. Additional large vias for the SCLB,
SDAB, and ground are placed on the EVM to facilitate oscilloscope probe tips and scope ground
connections. The TCA9802EVM has a dedicated slave peripheral (temperature sensor,
) for each
unit, U1 and U2. The temperature sensor of U1 (U3) has an address of 0x48h and sending an I
2
C read
command for that address should give you a hex value of approximately 190h, assuming the EVM is at
room temperature (25°C). The address of U4 is 0x49h.
Figure 4. Example: USB2ANY I
2
C Master Connected to the TCA9802EVM
4.1.1
J1, A Side Connections
This is the connection for the leads from the I
2
C master source. The signals of the USB2ANY I
2
C master
are connected as follows: SDAA = J1-1, SCLA = J1-2, GND = J1-3,4,5,7, or 8, and +V
CCA
= J1-6.
