RF2968 Просмотр технического описания (PDF) - RF Micro Devices

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RF2968

BLUETOOTH™ TRANSCEIVER

RF Micro Devices 

Preliminary

RF2968

PLL[6:0]:

These bits determine the local oscillator (LO) frequency (i.e., the frequency at the doubler output) for both RX and TX

modes. The LO frequency is set 1MHz above the channel center frequency. The PLL [6:0] data bits represent the fre-

quency offset (FOFFSET) in MHz from a base frequency of 2400MHz. For the normal Bluetooth frequency range of

2402MHz to 2480MHz, FOFFSET will range from 3 to 81; for the optional extended Bluetooth range (up to 2497MHz),

FOFFSET will range from 3 to 98 (high-side injection assumed in both cases).

Example:

Assume a channel frequency of 2448MHz.

The LO frequency is then: 2448+1=2449MHz,

and FOFFSET is: 2449-2400= 49.

PLL [6:0] is then:0110001

Register 30 - Manufacturer’s ID Code LSB’s (Read-Only)

Bit Number

0 - 15

Bit Name

ID_Code [15:0]

Comments

Lower 16 bits of manufacturer’s code. The fixed “1” LSB of the manufacturer

code is read at bit 0.

Register 31 - Manufacturer’s ID Code MSB’s (Read-Only)

Bit Number

0 - 15

Bit Name

ID_Code [31:16]

Comments

Upper 16 bits of manufacturer’s code. The MSB of the version number is

read at bit 15. The RF2968 code is hex10B9825D.

Bidirectional Interface

Data Exchange and Timing

All bidirectional timing may be derived from BRCLK, which is generated by the RF2968. The RF2968 uses the falling

edges of BRCLK, and the baseband uses the rising edges. Figure 4 shows the general timing for the case of data being

transferred from the RF2968 to the baseband.

BRCLK

BB Data

Sampling

Points

11

BDATA1

Figure 4. General Bidirectional Timing (RF2968 writing to baseband)

State Machine Control

The chip control circuitry of the RF2968 places the device into the required transmit, receive or power saving mode by

controlling the power down and reset states of all other circuits in the device. The chip control inputs come from the

baseband device (BnPWR, BXTLEN, BPKTCTL, BDATA1) via the bidirectional interface and from the registers at the

output of the DBus block (RXEN, TXEN). State machines in the baseband and the RF2968 maintain the state which con-

trols the direction of the bidirectional lines. The baseband controls the state machine in the RF2968 and ensures that

data contentions do not occur during reset and normal operation. The control of individual sections of the RF2968 in

each state is as follows.

Rev A13 010912

11-133

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