4 Pin Configuration and Functions

1

CEN

21

GND

2

PA_IN

20

GND

3

TX_FLT

19

GND

4

GND

18

GND

5

TR

17

ANT

6

GND

16

GND

7

CIB

15

GND

Not to scale

Thermal

Pad

Figure 4-1. VBA Package, 28-Pin WQFN-FCRLF (Top View)

Table 4-1. Pin Functions

PIN

TYPE(1)

DESCRIPTION

NAME

NO.

ANT

17

I/O

Antenna port.

CEN

1

D

Chip enable digital control logic.

CIB

7

D

Internal bias digital control logic.

CTR

8

D

Transmit and receive path select digital control logic.

GND

4, 6, 9, 11, 14,

15, 16, 18, 19,

20, 21, 22, 23,

24, 27

–

RF ground.

LNA_IN

10

I

LNA input. Can be shorted to RX_FLT if receive filter is not required.

PA_IN

2

I

PA input.

RX_FLT

12

O

Receive signal from ANT pin. Typically RX filter connected between RX_FLT and LNA_IN.

TR

5

I/O

Transmit/receive.

TX_FLT

3

O

Transmit signal from TR pin. Typically TX filter connected between TX_FLT and PA_IN.

VCC

28

P

LNA and digital control logic supply voltage.

VCC_PA

25, 26

P

PA supply voltage.

VDET

13

O

Power detector voltage output.

Thermal

Pad

Pad

–

Thermal pad and serves as ground reference. Connect to heat-dissipating ground plane on the

board.

(1)

I = analog input, O = analog output, D = digital control logic, P = power,

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TRF2001

SLVSK83 – APRIL 2026

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