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@ 2007 Yamar Electronics Ltd.

8

DS-SIG40 R1.8

0[4]

nAuto sleep

R/W

1 0 = Automatically enters into Sleep Mode

when no reception from the DC line for 8 Sec.

1

0[6:5]

For future use

00

0[7]

Interference

R

1 Interference Detected indication

-

1[5:0]

F0, F1, bit rate select R/W

6 See Tables 4.2 and 4.3

“FF”H

1[7:6]

For future use

Should be “11”

11

4.3

SIG40 Configuration

The SIG40 operates at default with the following parameters:

Bit rate: 19.2 kbps

F0=5.5MHz, F1=6.5MHz

The following configuration bits set the operating frequencies according to table 4.2.

Table 4.2 – F0, F1 select

Control_register1

(3:0)

F0

F1

0000

3.58Mhz

4.5Mhz

0001

3.58Mhz

5.5Mhz

0010

3.58Mhz

6Mhz

0011

3.58Mhz

6.5Mhz

0100

4.5Mhz

5.5Mhz

0101

4.5Mhz

6Mhz

0110

4.5Mhz

6.5Mhz

0111

4.5Mhz

Reserved

1000

Reserved

Reserved

1001

5.5Mhz

Reserved

1010

5.5Mhz

Reserved

1011

6Mhz

Reserved

1100

6Mhz

Reserved

1101

6.5Mhz

Reserved

1110

6.5Mhz

Reserved

1111

5.5Mhz

6.5Mhz

Table 4.3 – bit rates select

Control_register_1

(5:4)

01 = 57.6Kbps

10 =

Reserved

00 = 38.4Kbps

11 = 19.2Kbps

4.3.1

Command Mode

When in command mode, the host can configure the device according to the desired operating

parameters. The device enters command mode when pin HDC is lowered to zero. When in command

mode, data on the HDI pin is not transmitted to the bus, but is used to configure the SIG40. The

command can be written in any of the allowed Bit Rates.

In order to write to a control register, the host sends two bytes. The first byte begins with the address of

the register followed by 5(hex), and the second byte is the configuration data, as shown in figure 4.2.

The bytes should be sent more than 200nSec after lowering HDC.

Higher nibble [7:4]

Lower nibble [3:0]

First Byte

Register Address

5(hex)

Second Byte

Configuration Data

Configuration Data

Table 4.4 - Write Command

Figure 4.3 shows the pins involved in the writing process: