RTL2832U datasheet(21/53 Pages) REALTEK

21 / 53 page

for

V4L

CONFIDENTIAL

Realtek

RTL2832U

Datasheet

DVB-T COFDM Demodulator + USB 2.0

Track ID: JATR-2265-11

Rev. 1.4

8.3. Two-Wire Interface Between the Tuner and the RTL2832U

Figure 5.

Two-Wire Interface between the Tuner and RTL2832U

The RTL2832U supports an I2C repeater to prevent tuner interference from the two-wire interface. In

normal situations the tuner cannot hear any command sent via the two-wire interface. We need to turn on

the I2C repeater (set register IIC_repeat=1) in order to send a command to the tuner. The command will

be heard by the tuner and the RTL2832U at the same time. The Tuner and RTL2832U can distinguish the

origin of the command by the I2C address. On the PCB, pin I2C_SDAT/I2C_SCLT should be connected

to pull-high resisters (10k ohm) to pull-high the two-wire bus.

Table 3.

2C Repeater Register Table

Page

Offset{MSB,LSB} Bits Used

Default (Hex) Description

IIC_repeat

0x01

[3]

I2C Repeater for Tuner

1: Enable

0: Disable

Note 1: IIC_repeat should be set to 1 before sending a command to the tuner.

Note2: IIC_repeat is not automatically set to 0 after receiving a ‘STOP’ command.

RTL2832U Datasheet(PDF) 21 Page - Realtek Semiconductor Corp.