Datasheet

HOST
SER
or
DES
SCL
SDA
4.7k 4.7k
10k
R
CAD
SCL
SDA
To other
Devices
CAD
1.8V
V
DDIO
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 (I
2
C 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).
Figure 29. Serial Control Bus Connection
Table 3. CAD Resistor Value - DS92LX1621 Ser
Resistor RID Ω Address 7'b Address 8'b 0 appended (WRITE)
(±0.1%)
0 7b' 101 1000 (h'58) 8b' 1011 0000 (h'B0)
GND
2.0k 7b' 101 1001 (h'59) 8b' 1011 0010 (h'B2)
4.7k 7b' 101 1010 (h'5A) 8b' 1011 0100 (h'B4)
8.2k 7b' 101 1011 (h'5B) 8b' 1011 0110 (h'B6)
12.1k 7b' 101 1100 (h'5C) 8b' 1011 1000 (h'B8)
39.0k 7b' 101 1110 (h'5E) 8b' 1011 1100 (h'BC)
Table 4. CAD Resistor Value - DS92LX1622 Des
Resistor RID Ω Address 7'b Address 8'b 0 appended (WRITE)
(±0.1%)
0 7b' 110 0000 (h'60) 8b' 1100 0000 (h'C0)
GND
2.0k 7b' 110 0001 (h'61) 8b' 1100 0010 (h'C2)
4.7k 7b' 110 0010 (h'62) 8b' 1100 0100 (h'C4)
8.2k 7b' 110 0011 (h'63) 8b' 1101 0110 (h'C6)
12.1k 7b' 110 0100 (h'64) 8b' 1101 1000 (h'C8)
39.0k 7b' 110 0110 (h'66) 8b' 1100 1100 (h'CC)
CAMERA MODE OPERATION
In Camera mode, I
2
C transactions originate from the Master controller at the Deserializer side. The I
2
C 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 I
2
C transaction on its local I
2
C bus. At the same time, the Serializer will capture
the response on the I
2
C bus and return the response on the forward channel link. The Deserializer parses the
response and passes the appropriate response to the Deserializer I
2
C bus.
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