BK1085SB datasheet(4/20 Pages) BEKEN

4 / 20 page

BK1085

Rev.1.1

Proprietary and Confidential

Page 4 of 20

Table 1 [D3, D2, D1, D0] mapping to channel frequency

Channel

selection bits

Channel

Frequency (MHz)

Channel

selection bits

Channel

Frequency (MHz)

87.7

106.7

87.9

106.9

88.1

107.1

88.3

107.3

88.5

107.5

88.7

107.7

88.9

107.9

From register

2.6 FM modulator

The

transmitter

uses

direct

frequency synthesis to radiate FM wave

to the air by modulating the carrier

signal with the composite signal.

2.7 Reference Clock

The BK1085 accepts wide range, from

32.768 kHz to 38.4 MHz, reference

clock input to the XI pin. For frequency

less than 4 MHz, it must be multiplier of

32.768 KHz. The BK1085 also support

crystal oscillator, using XI and XO pins. .

2.8 Programming Interface

The BK1085 supports both 2-wire I2C

(MODE=0) and 3-wire SPI (MODE=1)

programming interface. Interface clock

rate can be up to 20MHz.

BK1085 always latches data at the SCK

rising edge and outputs its data at SCK

falling edge. For MCU, data should be

always written at the falling edge of

SCK, and read out at the rising edge of

SCK.

2.8.1 3-wire bus mode

When selecting 3-wire mode, user must

set MODE = 1.

3-wire bus mode uses SCK, MOSI and

CSN pins. A transaction begins when

user drives CSN low. Next, user drives

an 8-bit command serially on MOSI,

which is captured by BK1085 on rising

edges of SCK. The command consists of

a 7-bit start register address, followed by

a read/write bit (read = 1, write = 0).

2.8.2 I2C bus mode

When selecting I2C mode, user must set

MODE = 0.

I2C bus mode only uses SCK and MOSI

pins. A transaction begins with the start

condition, which occurs when MOSI

falls while SCK is high. Next, user

drivers an 8-bit device ID serially on

MOSI, which is captured by BK1085 at

the rising edge of SCK. The device ID of

BK1085 is 0x1D.

After driving the device ID, user drives

an 8-bit control word on MOSI. The

control word consists of a 7-bit start

address,

followed

read/write bit (read = 1, write = 0).

For I2C host reading, the host must give

an ACK to BK1085 after each byte

access, and should give a NACK to

BK1085

after

last

byte

read

out.

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