TUSB3210
8052 uC
w/ USB Interface
and UART
USB Bus from
Computer
3.3V Regulator
+3.3V
USB
+5.0V
8Kx8 Byte
EEPROM
Buffers and
Level
Translators
Power
Switching
Vdut
(Hi-Z, 3.3V or 5V)
Switched Power
I2C
SPI
Control Bits
Measure Bits
Power on Reset
SM-USB-DIG
To
Te
st
Bo
a
rd
To
Co
mp
u
te
r
a
n
d
Po
we
r
S
u
p
p
lie
s
+3.3V
USB +5.0V
Theory of Operation for USB DIG Platform
Table 2-1. Pin Connector
PIN
Signal
Description
On
U1
1
I2C_SCL
I
2
C Clock Signal (SCL)
2
CTRL/MEAS4
GPIO – Control Output or Measure Input
3
I2C_SDA1
I
2
C Data Signal (SDA)
4
CTRL/MEAS5
GPIO – Control Output or Measure Input
5
SPI_DOUT1
SPI Data Output (MOSI)
6
VDUT
Switchable DUT Power Supply: 3.3 V, 5 V, Hi-Z (Disconnected).
(1)
7
SPI_CLK
SPI Clock Signal (SCLK)
8
GND
Power Return (GND)
9
SPI_CS1
SPI Chip Select Signal (/CS)
10
SPI_DIN1
SPI Data Input (MISO)
(1)
When VDUT is Hi-Z all Digital I/O are Hi-Z as well.
2.3
Theory of Operation for USB DIG Platform
shows the block diagram for the SM-USB-DIG platform. This platform is a general purpose data
acquisition system that is used on several different Texas Instruments evaluation modules. The details of
its operation are included in a separate document. The block diagram shown in
is given as a
brief overview of the platform.
The brain of the SM-USB-DIG Platform is the TUSB3210. The TUSB3210 is an 8052 microcontroller that
has a built in USB interface. The microcontroller receives information from the host computer that it
interprets into power, I
2
C, SPI, and other digital I/O patterns. During the digital I/O transaction, the
microcontroller reads the response of any device connected to the I/O interface. The response from the
device is sent back to the PC where it is interpreted by the host computer.
Figure 2-3. USB DIG Platform Block Diagram
8
TMP451EVM Hardware Setup
SBOU131 – June 2013
Copyright © 2013, Texas Instruments Incorporated
