DS90UA101-Q1_14 Datasheet, PDF (27/41 Pages) Texas Instruments – Multi-Channel Digital Audio Link

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HOST
SCL
SDA
DS90UA101-Q1
SNLS441A – JULY 2013 – REVISED SEPTEMBER 2013
1.8V
V_DDIO
RPU
RPU
10k3
R_ID
IDx
Serializer
SCL
SDA
To other Devices
Figure 24. IDx Address Select
Resistor R_ID (kΩ)
(1% Tolerance)
0
2
4.7
8.2
14
100
Table 2. IDx Recommended Resistor Values
IDx Resistor Value
7-Bit Address
8-Bit Address (0 appended)
0x58
0x59
0x5A
0x5B
0x5C
0x5D
0xB0
0xB2
0xB4
0xB6
0xB8
0xBA
Note: The I²C address of the Serializer can also be set using 0x00[7:1] once 0x00[0] is set to 1.
I²C Pass-Through
I²C pass-through is the feature that provides a way to access remote devices at the other end of the serial
interface. For example, when the I²C Master is connected to the Deserializer and I²C pass-through is enabled on
the Deserializer, any I²C traffic targeted for the remote Serializer or remote slave will be allowed to pass through
the Deserializer to reach those respective devices.
See Figure 25 for an example of this function:
• If Master (DSP) transmits an I²C transaction for SER A, then DES A with I²C pass-through enabled will
transfer that I²C command to SER A. Responses from SER A will travel from SER A --> DES A --> DSP.
• If Master transmits an I²C transaction for address 0xA0, then DES A with I²C pass-through enabled will
transfer that I²C command to SER A, which will then transfer it to remote slave Device A. Responses from
Device A will travel from Device A --> SER A --> DES A --> DSP.
• As for DES B with I²C pass-through disabled, any I²C commands for SER B or Device B will NOT be passed
on the I²C bus to SER B/Device B.
Copyright © 2013, Texas Instruments Incorporated
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