Datasheet

Test Outputs
25-Pin Male
DSUB
External BUF12800
Analog Power Supply
T1
V Supply
(V Power Supply)
DUT
SD
I C Interface
2
I C A0 Address
Jumper
2
TP1
Test Point
Header
J1
BUF12800
BUF12800EVM Hardware Setup www.ti.com
2.1 Theory of Operation for BUF12800 Hardware
Figure 3 shows the BUF12800 test board hardware setup. The functionality of the PCB is such that it
provides connections to the I
2
C™ and general-purpose inputs/outputs (GPIOs) on the USB DIG Platform
board. It also provides connection points for external connections of the shunt voltage, bus voltage, and
ground.
Figure 3. BUF12800EVM Board Block Diagram
2.2 Signal Definitions of J1 (25-Pin Male DSUB)
Table 3 shows the various signals connected to J1 on the BUF12800 test board.
Table 3. J1 Signal Definition for BUF12800EVM
Pin No on U1 Signal BUF12800 Pin
1 N/C No connection
2 N/C No connection
3 N/C No connection
4 N/C No connection
5 N/C No connection
6 N/C No connection
7 N/C No connection
8 N/C No connection
9 I2C_SCK No connection
10 I2C_SDA2 No connection
11 N/C No connection
12 I2C_SCK_ISO
I
2
C clock signal (SCL) channel 1; can be
disconnected using a switch
13 I2C_SDA_ISO
I
2
C data signal (SDA) channel 1; can be
disconnected using a switch
14 N/C No connection
15 N/C No connection
16 N/C No connection
17 V
DUT
Switched 3-V/5-V power
(1)
18 V
CC
No connection
19 N/C No connection
20 N/C No connection
21 GND Common ground connection
22 SPI_SCK No connection
23 SPI_CS1 No connection
24 SPI_DOUT1 No connection
25 SPI_DIN1 No connection
(1)
When power is switched off, digital I/O is also switched off.
4
BUF12800EVM Evaluation Board and Software Tutorial SBOU116–September 2011
Submit Documentation Feedback
Copyright © 2011, Texas Instruments Incorporated