Texas Instruments DAC80501, Руководство пользователя, Страница: 6 / 19

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Inte rface
Detailed Description
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6 SLAU795 – November 2018
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Copyright © 2018, Texas Instruments Incorporated
DAC80501EVM
3 Detailed Description
3.1 Hardware Description
The following sections provide detailed information on the EVM hardware and jumper configuration
settings.
Table 5 displays the default configurations of all jumper connections on the DAC80501EVM.
Connect the USB cable from the USB2ANY to the PC.
Table 5. Jumper Settings
Jumper Default Position Available Option Description
JP1
Open: VDD is supplied externally
through J2
Closed: VDD should be supplied by
USB2ANY (the reference headroom
must be maintained)
VDD Source Selection
JP2 Closed: SPI Enabled
Open: I2C Enabled (Not supported
in the software)
SPI or I2C Interface Selection
JP3 Open: SYNC/A0 HIGH Closed: SYNC/A0 LOW SYNC/A0 Level
JP4 Open: Internal Reference
Closed: External On-board
Reference
Reference Selection
3.1.1 Theory of Operation for DAC80501 Hardware
The block diagram of the DAC80501EVM board is displayed in Figure 4 . The EVM board connects to
external power supply VDD either through USB2ANY (3.3V) or through JP2. Note that the headroom for
the reference needs to be maintained as specified in the datasheet. The 10-pin wire-to-board connector J1
provides an interface to the USB2ANY platform. The SPI signals are provided either by using the
USB2ANY header or the test points. There is an onboard 5-V reference source selected using JP4. JP4 is
open by default making the DAC work with the internal reference.
Figure 4. DAC80501EVM Hardware Block Diagram