5.1 Oscillator Pin 1 Control DIP Switch (Pin_1_Ctrl)
The pin 1 control DIP switch allows oscillator pin 1 to be driven from any of these 4 sources.
1. High (VDD) level
2. Low (GND) level
3. I2C bus SDA signal
4. External control voltage Vc (for VCXO applications)
Note:
The 4 signal sources listed above are connected on separate pins on left side of the switch and all pins on right side are tied
together (common) and then connect to pin 1 of the oscillator.
This means that only one (1) of the switches in this DIP switch bank
can be in the ON position at a time.
Switching more than 1 switch to the on position at a time may cause undesired behavior. All
switches can be set to OFF position to effectively isolate pin 1 from any signal source and is the No Connect (NC) state.
To determine the required Pin 1 switch settings for your specific device, please refer to the Supported Device Tables in Chapter
6. Supported Devices - Stand-Alone Mode
7. Supported Devices - Software Controlled Mode - I
.
Pin 1 DIP Switch (4, 6, or 8 pin DUT)
1
2
3
4
Pin 1 Signal
Off
Off
Off
Off
NC
On
Off
Off
Off
FS/OE high
Off
On
Off
Off
FS/OE low
Off
Off
On
Off
SDA
Off
Off
Off
On
Vc
UG298: Si5xxUC-EVB
Control Signal Switch Settings
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