Техническая Спецификация для Texas Instruments PGA112 Evaluation Module Rev B PGA112EVM-B PGA112EVM-B
Модели
PGA112EVM-B
TUSB3210
8052 mC
w/USB Interface
and UART
USB Bus
from
Computer
3.3-V
Regulator
+3.3 V
USB
+5.0 V
+5.0 V
8K x 8 Byte
EEPROM
Buffers and
Level
Translators
Power
Switching
Vdut
(Hi-Z, 3.3 V, or 5 V)
Switched Power
I
2
C
SPI
Control Bits
Measure Bits
Control Bits
Measure Bits
Power on
Reset
SM-USB-DIG Platform
T
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+3.3 V
USB +5.0 V
EVM Hardware Setup
2.2
Signal Definitions of J1 (10-Pin Male Connector Socket)
shows the pin out for the 10-pin connector socket used to communicate between the EVM and the
SM-USB-DIG. Note that the EVM uses only the I
2
C communication lines, VDUT (pin 6), GND (pin 8), and
CTRL/MEAS4 (pin 2).
Table 2. SM-USB-DIG Pin Definitions
Pin on U1
Signal
Description
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)
Switchable DUT power supply: +3.3 V, +5 V, Hi-Z (disconnected).
6
VDUT
NOTE: When VDUT is Hi-Z, all digital I/O are also Hi-Z.
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)
2.3
Theory of Operation for SM-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 the SM-USB-DIG Platform User's Guide (
its operation are included in the SM-USB-DIG Platform User's Guide (
). The block diagram
shown in
is given as a brief overview of the platform.
Figure 3. SM-USB-DIG Platform Block Diagram
The primary component of the SM-USB-DIG Platform is the
, an 8052 microcontroller with a
built-in USB interface. The microcontroller receives information from the host computer that is interpreted
into power, I
into power, I
2
C, SPI, and other digital I/O methods. 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.
back to the PC, where it is interpreted by the host computer.
4
PGA112EVM and PGA113EVM User’s Guide
SBOU073A – February 2009 – Revised May 2012
Copyright © 2009–2012, Texas Instruments Incorporated