DS90UB914ATRHSTQ1 Datasheet, PDF (47/68 Pages) Texas Instruments – DS90UB913A-Q1/DS90UB914A-Q1 25 to100 MHz 10/12-Bit

DS90UB913A-Q1, DS90UB914A-Q1
www.ti.com
SNLS443A – MAY 2013 – REVISED JUNE 2013
I2C Pass-Through
I2C pass-through provides a way to access remote devices at the other end of the FPD-Link III interface. This
option is used to determine if an I2C instruction is transferred over to the remote I2C bus. 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 35 for an example of this function and refer to application note: I2C over DS90UB913/4 FPD-Link III
with Bidirectional Control Channel ().
If master controller transmits I2C transaction for address 0xA0, the DES A with I2C pass-through enabled will
transfer I2C commands to remote Camera A. The DES B with I2C pass-through disabled, any I2C commands
will NOT be passed on the I2C bus to Camera B.
DS90UB913AQ
DS90UB914AQ
CMOS
Image
Sensor
DIN[11:0]
,HS,VS
PCLK
ROUT[11:0],
HS,VS,
PCLK
Camera A
Slave ID: (0xA0)
SDA
SCL
I²C
I²C
SDA
SCL
SER A:
DES A: I2C_SLAVE
Remote I2C _MASTER Proxy
Local
I2C_PASS_THRU Enabled
DS90UB913AQ
DS90UB914AQ
CMOS
Image
Sensor
DIN[11:0]
,HS,VS
PCLK
ROUT[11:0],
HS,VS,
PCLK
ECU
Module
Camera B
Slave ID: (0xA0)
SDA
SCL
I²C
I²C
SDA
SCL
SER B:
DES B: I2C_SLAVE
Remote I2C_MASTER Proxy
Local
I2C_PASS_THRU Disabled
Figure 35. I2C Pass-Through
PC
Master
ID[x] Address Decoder on the Serializer
The ID[x] pin on the Serializer is used to decode and set the physical slave address of the Serializer (I2C only) to
allow up to five devices on the bus connected to the Serializer using only a single pin. The pin sets one of the 6
possible addresses for each Serializer device. The pin must be pulled to VDD (1.8V, not VDDIO) with a 10 kΩ
resistor and a pull down resistor (R_ID) of the recommended value to set the physical device address. The
recommended maximum resistor tolerance is 1%.
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