MC13203FCR2 Datasheet MC13203FC, MC13203FCR2 | P25-P27

MC13202/203 Technical Data, Rev. 1.1

Freescale Semiconductor 25

Figure 14. Dual Port RF Configuration Examples

Balun

Bypass

RFIN_P (PAO_P)

RFIN_M (PAO_M)

CT_Bias

(Ant Sw Ctl)

PAO_P

PAO_M

MC13202/03

LNA

Ant

Balun

VDD

VDDA

Bypass

Using External Antenna Switch with LNA

RFIN_P (PAO_P)

RFIN_M (PAO_M)

CT_Bias

PAO_P

PAO_M

MC13202/03

VDDA

TX Antenna

Bypass Bypass

L2 L3

L4 L5

RX Antenna

Using Dual Antenna

MC13202/203 Technical Data, Rev. 1.1

26 Freescale Semiconductor

9.2 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 9.1.2, “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 9.1.1, “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

MC13202/203 Technical Data, Rev. 1.1

Freescale Semiconductor 27

Table 10 summarizes the operation of the RF interface control bits.

9.3 RF Control Output CT_Bias

CT_Bias is a useful signal for interface with external RF components. It must be enabled via the ct_bias_en

control bit, and then its state is determined first by the selected RF mode and then by the active state of the

radio, i.e., whether a TX or RX operation is active:

• Single Port Operation — In this mode, the CT_Bias can be used to establish the proper DC bias

voltage to a balun depending on the RX state versus TX state as described in Section 9.1.1, “Single

Port Operation”. Note that in single port operation, the ct_bias_inv has no effect and CT_Bias is at

VDDA for TX and is at ground for RX

• Dual Port Operation — In this mode, the CT_Bias can be used as a control signal to enable a LNA

or PA or to determine the direction of an antenna switch as described in Section 9.1.2, “Dual Port

Operation”. In dual port operation, ct-bias_inv is used to control the sense of the output control,

i.e., CT_Bias can be active high or active low for TX and vice-versa for RX

Table 11 defines the CT_Bias output state depending on control bits and operation mode of the modem.

Note that the output state is also defined in Idle, Hibernate, and Doze state as well as RX and TX operation.

Table 10. RF Interface Control Bits

Bit Designation Default Operation

14 ct_bias_en 0 1 = CT_Bias enabled. Output state is defined by Table 11.

0 = CT_Bias disabled. Output state is tri-stated.

13 ct_bias_inv 0 The output state of CT_Bias under varying conditions is defined in Table 11. This bit only

has effect for dual port operation.

1 = CT_Bias inverted.

0 = CT_Bias not inverted

12 RF_switch_mode 0 1= Single Port Mode selected where RF switch is active and RFIN_M and RFIN_P and

bidirectional signals.

0 = Dual Port Mode selected where RFIN_M and RFIN_P are inputs only and PAO_P

and PAO_N are separate outputs.

(This is default operation).

Table 11. CT_Bias Output vs. Register Settings

Mode CT_Bias_en RF_switch_mode CT_Bias_inv CT_Bias

RX 1 1 0 0

RX 1 1 1 0

RX 1 0 0 0

RX 0 X X Hi-Z

RX 1 1 0 1

TX 1 1 0 1

TX 1 1 1 1

TX 1 0 0 1

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

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MC13203FCR2

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