F2912

High Reliability SP2T RF Switch

6

F2912, Rev 3, 04/01/2016

The F2912 switch states are designed to be controlled by using either a 2 pin logic control (see Table 1) or a 1 pin

logic control (see Table 2). Table 3 describes the settings to enable one or two pin control. The F2912 also has the

ability to be controlled by 3 V or 1.8 V control logic based on the setting of Pin 18 (See Table 4). See Pin Compatibility

in the Applications Information section for more details.

Table 1 - Switch Control Truth Table for 2 pin logic control (ModeCTL = GND)

State

Control pin input

RF1, RF2 Input / Output

CTL1

(Pin 17)

CTL2

(Pin 16)

RF1 to RF Com RF2 to RF Com

1

Low

Low

OFF

OFF

2

Low

High

OFF

ON

3

High

Low

ON

OFF

4

High

High

N/A

N/A

Table 2 – Switch Control Truth Table for 1 pin logic control (ModeCTL = VCC)

State

Control Pin Input

RF1, RF2 Input / Output

CTL1

(Pin 17)

CTL2

(Pin 16) RF1 to RF Com RF2 to RF Com

2

Don't Care

High

OFF

ON

3

Don't Care

Low

ON

OFF

Table 3 – Mode Control Truth Table to set for 1 or 2 pin logic control

ModeCTL (Pin 19)

Pin Control Mode

GND

2-pin control: CTL1 and CTL2

1-pin control: CTL2

Notes:

1. When RF1 and RF2 ports are both open (State 1), all 3 RF ports are terminated to an internal 50 Ω

termination resistor.

2. When RF1 or RF2 port is open (State 2 or State 3 OFF condition), the open port is connected to an

internal 50 Ω termination resistor.

3. When RF1 or RF2 port is closed (State 2 or State 3 ON condition), the closed port is connected to the

RF Com port.

Table 4 - Logic Control (pin 18) Truth Table

LogicCTL (Pin 18)

Logic Voltage

1.8 V

GND

3.3 V