MC13201 Technical Data, Rev. 1.1,

14

Freescale Semiconductor

7

Pin Connections

Table 8. Pin Function Description

Pin #

Pin Name

Type

Description

Functionality

1

RFIN_M

RF Input

RF input/output negative.

When used with internal T/R switch, this is

a bi-directional RF port for the internal LNA

and PA

2

RFIN_P

RF Input

RF input/output positive.

When used with internal T/R switch, this is

a bi-directional RF port for the internal LNA

and PA

3

CT_Bias

Control voltage

Bias voltage/control signal for

external RF components

When used with internal T/R switch,

provides RX ground reference and TX

VDDA reference for use with external

balun. Can also be used as a control signal

for external LNA, PA, or T/R switch.

4

NC

Tie to Ground.

5

PAO_P

RF Output /DC Input RF Power Amplifier Output Positive.

Open drain. Connect to VDDA through a

bias network when used with an external

balun. Not used when internal T/R switch is

used.

6

PAO_M

RF Output/DC Input RF Power Amplifier Output Negative. Open drain. Connect to VDDA through a

bias network when used with an external

balun. Not used when internal T/R switch is

used.

7

SM

Input

Test mode pin.

Must be grounded for normal operation.

8

Digital Input/ Output General Purpose Input/Output 4.

See Footnote 1

9

GPIO3

Digital Input/ Output General Purpose Input/Output 3.

10

GPIO2

Digital Input/ Output General Purpose Input/Output 2.

When gpio_alt_en, Register 9, Bit 7 =

1, GPIO2 functions as a “CRC Valid”

indicator.

11

GPIO1

Digital Input/ Output General Purpose Input/Output 1.

When gpio_alt_en, Register 9, Bit 7 =

1, GPIO1 functions as an “Out of Idle”

indicator.

12

RST

Digital Input

Active Low Reset. While held low, the

IC is in Off Mode and all internal

information is lost from RAM and SPI

registers. When high, IC goes to IDLE

Mode, with SPI in default state.