Microchip Technology ADM00795, Руководство пользователя

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HV2903 Analog Switch Evaluation Board User’s Guide
DS50002582A-page 21
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2017 Microchip Technology Inc.
all the switches are set to OFF.
7. A/B: when selected, the A/B logic input is set to high, all the even switches are
set to ON and all the odd switches are set to OFF. When unselected, the A/B
logic input is set to low, all the even switches are set to OFF and all the odd
switches are set to ON.
8. Set HV MUX: when clicked, the data that the user sets at steps 2 to 7 is applied
to HV2903. Please note that the 32-bit DIN data, 32 clocks and one negative LE
pulse are applied one time only at the individual switching mode.
9. Pulses: entry box to define the number of pulses in the pulse train generated by
the selected pulser. A pulse is a half of the cycle and the pulse train always starts
the positive pulse first.
10. TOFF: entry box to define the OFF time between pulse trains generated by the
selected pulser.
11. CH1/CH2: when checked, the selected pulser is set to generate 5 MHz pulse
trains defined at steps 9 and 10 by the user.
12. Start: when clicked, the selected pulser starts generating the pulse train.
13. Stop: when clicked, the selected pulser stops generating the pulse train.
14. Message window: shows information from the GUI program.
15.
Clear: when clicked, the messages in the message window are cleared.
16. Connection Status window: shows status of the connection between the GUI and
the HV MUX Controller.
2.7 GENERATION OF PULSER OUTPUT AT SW8A OF HV MUX
This section provides the simple step-by-step procedure to make the Ch1 pulser output
at SW8A SMA connector by configuring the GUI.
1. Before powering up the HV2903 Analog Switch Evaluation Board, make sure
that the latest GUI software is installed on the PC.
2. Start the GUI program. On the bottom left of the status bar, “Not Connected” will
appear.
3. Power up the HV MUX Controller and HV2903 Analog Switch Evaluation Board
as described in the previous section. The prompt “Connected” will appear in the
status bar.
4. Click the Initialize HV MUX Controller button and check the message window
to see “Initialization Complete”.
5. Unselect STBY to set the HV2903 to operate normally.
6. Select MODE to set the HV2903 to individual switching mode.
7. Change the DIN to Bit 8 from
0
to
1
to set SW8 ON (DIN =
00000000
00000000 00000001 00000000
).
8. Click the Set HV MUX button. HV2903 SW8 will turn on.
9. Change Pulses to 10.
10. Select CH1.
11. Click the
Start button. The CH1 pulser will start to generate pulse trains with 10
pulses and 30 ms T
OFF
time.
The Ch1 and Ch2 of the oscilloscope in Figure 2-10 show the SW8A and the SW9A.