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0[4]
0[6:5]
0[7]
1[5:0]
1[7:6]
nAuto sleep
R/W
1 0 = Automatically enters into Sleep Mode
when no reception from the DC line for 8 Sec.
1 Interference Detected indication
6 See Tables 4.2 and 4.3
Should be “11”
1
00
-
“FF”H
11
For future use
Interference
R
F0, F1, bit rate select R/W
For future use
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
F0
F1
(3:0)
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
3.58Mhz
3.58Mhz
3.58Mhz
3.58Mhz
4.5Mhz
4.5Mhz
4.5Mhz
4.5Mhz
Reserved
5.5Mhz
5.5Mhz
6Mhz
6Mhz
6.5Mhz
6.5Mhz
5.5Mhz
4.5Mhz
5.5Mhz
6Mhz
6.5Mhz
5.5Mhz
6Mhz
6.5Mhz
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
6.5Mhz
Table 4.3 – bit rates select
Control_register_1 01 = 57.6Kbps
(5:4)
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:
@ 2007 Yamar Electronics Ltd.
8
DS-SIG40 R1.8
YAMAR [ YAMAR ELECTRONICS LTD. ]
