DS92LX1621_14 Datasheet, PDF (27/48 Pages) Texas Instruments – 10 - 50 MHz DC-Balanced Channel Link III Serializer and Deserializer with Bi-Directional Control Channel

DS92LX1621, DS92LX1622
www.ti.com
SNLS327I – MAY 2010 – REVISED JANUARY 2014
CAD PIN ADDRESS DECODER
The CAD pin is used to decode and set the physical slave address of the Serializer/Deserializer (I²C only) to
allow up to six devices on the bus using only a single pin. The pin sets one of six possible addresses for each
Serializer/Deserializer device. The pin must be pulled to VDD (1.8V, NOT VDDIO)) with a 10 kΩ resistor and a
pull down resistor (RID) of the recommended value to set the physical device address. The recommended
maximum resistor tolerance is 0.1% worst case (0.2% total tolerance).
1.8V
HOST
SCL
SDA
V_DDIO
4.7k
4.7k
10k
CAD
R_CAD
SER
or
SCL _DES
SDA
To other
Devices
Figure 29. Serial Control Bus Connection
Resistor RID Ω
(±0.1%)
0
GND
2.0k
4.7k
8.2k
12.1k
39.0k
Table 3. CAD Resistor Value - DS92LX1621 Ser
Address 7'b
Address 8'b 0 appended (WRITE)
7b' 101 1000 (h'58)
8b' 1011 0000 (h'B0)
7b' 101 1001 (h'59)
7b' 101 1010 (h'5A)
7b' 101 1011 (h'5B)
7b' 101 1100 (h'5C)
7b' 101 1110 (h'5E)
8b' 1011 0010 (h'B2)
8b' 1011 0100 (h'B4)
8b' 1011 0110 (h'B6)
8b' 1011 1000 (h'B8)
8b' 1011 1100 (h'BC)
Resistor RID Ω
(±0.1%)
0
GND
2.0k
4.7k
8.2k
12.1k
39.0k
Table 4. CAD Resistor Value - DS92LX1622 Des
Address 7'b
Address 8'b 0 appended (WRITE)
7b' 110 0000 (h'60)
8b' 1100 0000 (h'C0)
7b' 110 0001 (h'61)
7b' 110 0010 (h'62)
7b' 110 0011 (h'63)
7b' 110 0100 (h'64)
7b' 110 0110 (h'66)
8b' 1100 0010 (h'C2)
8b' 1100 0100 (h'C4)
8b' 1101 0110 (h'C6)
8b' 1101 1000 (h'C8)
8b' 1100 1100 (h'CC)
CAMERA MODE OPERATION
In Camera mode, I²C transactions originate from the Master controller at the Deserializer side. The I²C slave
core in the Deserializer will detect if a transaction is intended for the Serializer or a slave at the Serializer.
Commands are sent over the bi-directional control channel to initiate the transactions. The Serializer will receive
the command and generate an I²C transaction on its local I²C bus. At the same time, the Serializer will capture
the response on the I²C bus and return the response on the forward channel link. The Deserializer parses the
response and passes the appropriate response to the Deserializer I²C bus.
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