Texas Instruments DAC8775EVM, Руководство пользователя, Страница: 4 / 20

EVM Hardware Overview
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4 SBAU248 – November 2016
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Copyright © 2016, Texas Instruments Incorporated
DAC8775EVM User’s Guide
2.2 Electrostatic Discharge Warning
Many of the components on the EVM are susceptible to damage by electrostatic discharge (ESD). Users
are advised to observe proper ESD handling precautions when unpacking and handling the EVM,
including the use of a grounded wrist strap at an approved ESD workstation.
2.3 Jumper Summary
Table 3 summarizes all of the EVM jumper functionality.
Table 3. EVM Jumper Summary
JUMPER LABEL DEFAULT POSITION FUNCTION
JP1 1-2
1-2 Selects DC/DC Channel A to supply VPOSA
2-3 Selects PVDD/AVDD to supply VPOSA
JP2 1-2
1-2 Selects DC/DC Channel A to supply VNEGA
2-3 Selects AVSS to supply VNEGA
JP3 1-2
1-2 Selects DC/DC Channel B to supply VPOSB
2-3 Selects PVDD/AVDD to supply VPOSB
JP4 1-2
1-2 Selects DC/DC Channel B to supply VNEGB
2-3 Selects AVSS to supply VNEGB
JP5 1-2
1-2 Selects DC/DC Channel C to supply VPOSC
2-3 Selects PVDD/AVDD to supply VPOSC
JP6 1-2
1-2 Selects DC/DC Channel C to supply VNEGC
2-3 Selects AVSS to supply VNEGC
JP7 1-2
1-2 Selects DC/DC Channel D to supply VPOSD
2-3 Selects PVDD/AVDD to supply VPOSD
JP8 1-2
1-2 Selects DC/DC Channel D to supply VNEGD
2-3 Selects AVSS to supply VNEGD
JP9 Not installed
Installed Connects the SM-USB-DIG supply to DVDD
Not installed Disconnects the SM-USB-DIG supply from DVDD
JP10 1-2
1-2 Selects the DAC8775 internal reference
2-3 Selects the REF5050 external reference
JP11 Not installed
Installed Disables internal DVDD LDO
Not installed Enables internal DVDD LDO
JP12 2-3
1-2 Issues a clear command to the DAC8775
2-3 No operation
JP13 Not installed
Installed Selects the external DVDD
Not installed Disconnects the external DVDD
JP14 Not installed
Installed Issues a hardware reset to the DAC8775
Not installed No operation
JP15 Installed
Installed Select asynchronous update mode
Not installed Select synchronous update mode
JP16 Installed
Installed VSENSEPA is shorted to VOUTA on-board
Not installed VSENSEPA is shorted to VOUTA off-board
JP17 Installed
Installed VSENSEPB is shorted to VOUTB onboard
Not installed VSENSEPB is shorted to VOUTB off-board
JP18 Not installed
Installed Loads VOUTA/IOUTA with a short to GND
Not installed Unloads VOUTA/IOUTA of the short to GND
JP19 Installed
Installed Loads VOUTA/IOUTA with a 250-
Ω
resistor
Not installed Unloads VOUTA/IOUTA of the 250- Ω resistor
JP20 Not installed
Installed Loads VOUTA/IOUTA with a 625- Ω resistor
Not installed Unloads VOUTA/IOUTA of the 625- Ω resistor