RF2968 Просмотр технического описания (PDF) - RF Micro Devices

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RF2968

BLUETOOTH™ TRANSCEIVER

RF Micro Devices 

Preliminary

RF2968

In a read operation, the baseband sends the device address, READ bit (R/W = 1), and register address to the RF2968

followed by a “turn-around” bit which lasts half a clock cycle. This turn-around allows the RF2968 to drive its requested

data, via BDDATA, on the rising edges of BDCLK. Following the transfer of the last data bit (D[0]), the baseband drives

BnDEN high and resumes control of BDDATA on the falling edge of the first BDCLK pulse after BnDEN is driven high.

See Figure 3.

BDCLK

BDDATA

BnDEN

Master Driving BDDATA

Floating

Floating

Slave Driving BDDATA

...

A7

A6

A5

A4

A3

A2

A1

A0

... D15 D14

D2

D1

D0

don't

care

A7

A6

R/W = read = 1

turn-around

turn-around

Figure 3. DBus Read Programming Diagram

Register Definition

The register address field allows up to 32 registers for various functions. The RF2968 implements only register

addresses 3-7 and 30-31.

Register 3 - IF Register 1 (Read-Only)

Bit Number

Bit Name

Comments

7 - 15

N/A

Not Assigned

0 -6

RSSI[6:0]

The RSSI value indicates the average power measured during the first 10µs

after a packet has been detected. The baseband reads this register to obtain

the current received signal strength indicator measurement. The RSSI value

may range from 0dBm to -127dBm in 1dB increments. (All 0’s indicates

0dBm; all 1’s indicates -127dBm.) The RSSI circuitry is designed to operate

from -20dBm to -80dBm with an accuracy of 4dB at -60dBm.

Example: RSSI[6:0]=[110101] indicates -53dBm.

11

Rev A13 010912

11-129

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