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參數(shù)資料
| 型號： | AMC7820-EVM |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | AMC7820 Evaluation Module(AMC7820評估模塊) |
| 中文描述： | AMC7820評估模塊（AMC7820評估模塊） |
| 文件頁數(shù)： | 19/26頁 |
| 文件大?。?/td> | 297K |
| 代理商： | AMC7820-EVM |
Operation
3.3.1 SPI Interface
The SPI interface to the AMC7820 can be controlled from two sources: the external SPI
header, J2, or from the PC parallel port, J1. The PC parallel port connection is buffered
through U1. U1
’
s outputs are enabled only when pin 1 of U1 is LOW. This pin is pulled
HIGH by R1, so that if no parallel port is connected, U1
’
s outputs are tri-stated, allowing
the external SPI bus to drive the AMC7820. When the PC parallel port is connected, the
PC software will pull pin 1 of the parallel port (which is connected to pin1 of U1) LOW in
order to enable the PC to control the SPI bus.
Do not drive the external SPI bus when the PC parallel port is connected.
Disconnect the PC parallel port cable from the AMC7820-EVM if you want to use
the external SPI bus.
3.3.2 DC/DC Converter
In order to supply the AV
DD
and DV
DD
supplies from a 3.3V input on BV
DD
, the DC/DC
converter circuit around U3 will boost the 3.3V input to 5V. U3 is enabled when ENABLE
pin 2, is HIGH. R3 pulls this pin HIGH when JMP1 is not installed. When JMP1 is installed,
the ENABLE pin is held LOW and the DC/DC converter will not operate. This helps reduce
noise on the board when this feature is not needed.
With JMP1 removed, 5V will appear on the output of U3 (pin 8). JMP2 and JMP3 should
be installed to connect this 5V to AV
DD
and DV
DD
.
3.4 Program Description
After having installed the software for the AMC7820-EVM as described in section 2.3, you
may begin using it to evaluate and develop with the AMC7820.
3.4.1 Configuration and Control
The program
’
s interface is a simple, three-tab interface. Clicking on a tab will take you to
the functions associated with that tab. The default tab that the program begins on is the
Configuration and Control tab (see Figure 3).
3-4
3.3 Circuit Description
The AMC7820-EVM consists of two circuits: the SPI interface and the DC/DC converter.
The board consists primarily of breadboard area around the AMC7820.
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