Datasheet
ECU
Module
DS90UB914Q
DS90UB913Q
DIN[11:0]
,HS,VS
PCLK
CMOS
Image
Sensor
I
2
C
ROUT[11:0],
HS,VS,
PCLK
I
2
C
SDA
SCL
SDA
SCL
PC
DES B: I2C_SLAVE
DS90UB914Q
DS90UB913Q
DIN[11:0]
,HS,VS
PCLK
CMOS
Image
Sensor
I
2
C
ROUT[11:0],
HS,VS,
PCLK
I
2
C
SDA
SCL
SDA
SCL
Camera B
Slave ID: (0xA0)
SER A: I2C _MASTER
I2C_PASS_THRU Enabled
DES A: I2C_SLAVE
Camera A
Slave ID: (0xA0)
Master
SER B: I2C_MASTER
I2C_PASS_THRU Disabled
DS90UB913Q, DS90UB914Q
www.ti.com
SNLS420B –JULY 2012–REVISED APRIL 2013
I2C Pass Through
I2C pass-through provides an alternative means to independently address slave devices. The mode enables or
disables I2C bidirectional control channel communication to the remote I2C bus. This option is used to determine
whether or not an I2C instruction is to be transferred over to the remote I2C device. When enabled, the I2C bus
traffic will continue to pass through, I2C commands will be excluded to the remote I2C device. The pass through
function also provides access and communication to only specific devices on the remote bus.
See Figure 33 for an example of this function.
If master controller transmits I
2
C transaction for address 0xA0, the SER A with I
2
C pass through enabled will
transfer I
2
C commands to remote Camera A. The SER B with I
2
C pass through disabled, any I
2
C commands will
be bypassed on the I
2
C bus to Camera B.
Figure 33. I
2
C Pass Through
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 5
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 (RID) of the recommended value to set the physical device address. The
recommended maximum resistor tolerance is 1%.
Copyright © 2012–2013, Texas Instruments Incorporated Submit Documentation Feedback 43
Product Folder Links: DS90UB913Q DS90UB914Q