MC13201FC Datasheet MC13201FCR2, MC13201FC | P25-P27

MC13201 Technical Data, Rev. 1.3,

22 Freescale Semiconductor

8.5.1 Single Port Operation

The integrated RF switch allows users to operate in a single port configuration. In Single Port Mode, an

internal RX switch and separate PA are used and pins RFIN_P (PAO_P) and RFIN_M (PAO_M) become

bidirectional and connect both for TX and RX. When receiving, the RX switch is enabled to the internal

LNA and the TX PA is disabled. When transmitting, the RX switch is disabled (isolating the LNA) and a

TX PA is enabled. The optional CT_Bias pin provides a reference or bias voltage which is at VDDA for

transmit and is at ground for receive. This signal can be used to provide the proper bias voltage to a balun

that converts a single-ended antenna to the differential interface required by the transceiver.

Figure 13. Single Port RF Operation with a Balun

Figure 13 shows a single port example with a balun. The CT_Bias is connected to the balun center-tap

providing the proper DC bias voltage to the balun depending on RX or TX.

8.5.2 Dual Port Operation

A second set of pins designated PAO_P and PAO_N allow operation in a dual port configuration. There

are separate paths for transmit and receive with the optional CT_Bias pin providing a signal that indicates

if the radio is in TX or RX Mode which then can be used to drive an external low noise amplifier, power

amplifier, or antenna switch.

In dual port operation, the RFIN_P and RFIN_N are inputs only, the internal RX switch to the LNA is

enabled to receive, and the associated TX PA stays disabled. Pins PAO_P and PAO_N become the

differential output pins and the associated TX PA is enabled for transmit.

Figure 14 shows two dual port configurations. First is a single antenna configuration with an external low

noise amplifier (LNA) for greater range. An external antenna switch is used to multiplex the antenna

between receive and transmit. An LNA is in the receive path to add gain for greater receive sensitivity.

Two external baluns are required to convert the single-ended antenna switch signals to the differential

signals required by the radio. Separate RFIN and PAO signals are provided for connection with the baluns,

and the CT_bias signal is programmed to provide the external switch control. The polarity of the external

switch control is selectable.

Balun

Bypass

RFIN_P (PAO_P)

RFIN_M (PAO_M)

CT_Bia

PAO_P

PAO_M

MC13201

MC13201 Technical Data, Rev. 1.3,

Freescale Semiconductor 23

Figure 14 also shows a dual antenna configuration where there is a RX antenna and a TX antenna. For the

receive side, the RX antenna is ac-coupled to the differential RFIN inputs and these capacitors along with

inductor L1 form a matching network. Inductors L2 and L3 are ac-coupled to ground to form a frequency

trap. For the transmit side, the TX antenna is connected to the differential PAO outputs, and inductors L4

and L5 provide DC-biasing to VDDA but are ac-isolated. CT_Bias is not required or used.

Figure 14. Dual Port RF Configuration Examples

Using External Antenna Switch with LNA

Using Dual Antenna

Balun

Bypass

RFIN_P (PAO_P)

RFIN_M (PAO_M)

CT_Bia

PAO_P

PAO_M

MC13201

LNA

Ant

Balun

VDD

VDDA

Bypass

RFIN_P (PAO_P)

RFIN_M (PAO_M)

CT_Bias

PAO_P

PAO_M

MC13201

VDDA

TX Antenna

Bypass Bypass

L2 L3

L4 L5

RX Antenna

MC13201 Technical Data, Rev. 1.3,

24 Freescale Semiconductor

8.6 Controlling RF Modes of Operation

Use of the RF interface pins and RF modes of operation are controlled through several bits of modem

Control_B Register 07. Figure 15 shows the model for Register 07 with the RF interface control bits

highlighted.

Figure 15. Control_B Register 07 Model

The RF interface control bits include:

• RF_switch_mode (Bit 12) - This bit selects Dual Port Mode versus Single Port Mode:

— The default condition (Bit 12 = 0) is Dual Port Mode where the RF inputs are RFIN_M and

RFIN_P and the RF outputs are PAO_M and PAO_P, and operation is as described in

Section 8.5.2, “Dual Port Operation. The use of CT_Bias pin in Dual Port Mode is controlled

by Bit 13 and Bit 12.

— When Bit = 1, the Single Port Mode is selected where RFIN_M (PAO_M) and RFIN_P

(PAO_P) become bidirectional pins and operation is as described in Section 8.5.1, “Single Port

Operation. The use of CT_Bias pin in Dual Port Mode in controlled by Bit 13 and Bit 12.

• Ct_bias_en (Bit 14) - This bit is the enable for the CT_Bias output. When Bit 14 = 0 (default), the

CT_Bias is disabled and stays in a Hi-Z or tri-stated condition. When Bit 14 = 1, the CT_Bias

output is active and its state is controlled by the selected mode (Bit 12), ct_bias_inv, and operation

of the radio.

• Ct_bias_inv (Bit 13) - This bit only affects the state of CT_Bias when Dual Port Mode is selected

and CT_bias is active. The CT_Bias changes state in Dual Port Mode based on the TX or RX state

of the radio. The ct_bias_inv bit causes the sense of the active state to change or invert based on

Bit 13’s setting. In this manner, the user can select the CT_Bias as a control signal for external

components and make the control signal active high or active low.

0x07

BIT 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

tmr_load

ct_bias_en

ct_bias_inv

RF_switch_mode

miso_hiz_en

clko_doze_en

tx_done_mask

rx_done_mask

use_strm_mode

hib_en

doze_en

TYPE r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w

RESET

0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0

0x0C00

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P24 P25-P27 P28-P30 P31-P31

MC13201FC

Mfr. #:

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Manufacturer:

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Description:

RF Transceiver TORO IC NON 802.15.4

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MC13201FC

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