MAX4929E Просмотр технического описания (PDF) - Maxim Integrated

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MAX4929E

HDMI 2:1 Low-Frequency Translating Switch

Maxim Integrated 

HDMI 2:1 Low-Frequency Translating Switch

Functional Diagram

SDA1

SDA2

SCL1

SCL2

HPIR1

HPIR2

HPDO1

HPDO2

MAX4929E

HPD LOGIC

(V+)

V+

GND

SDAO

HPD LOGIC

(VL)

CLP VL

SCLO

SEL

HPD

HPIRO

HIZ1

HIZ2

EXESD

Detailed Description

The MAX4929E low-frequency 2:1 switch is ideal for the

low-frequency portion of HDMI/DVI switching applica-

tions. The device features three independent voltage

inputs that allow the user to match any voltage level

encountered in switching without additional compo-

nents. The V+ range is from 4.5V to 5.5V to match the

HDMI/DVI 5V requirements. CLP is set to match the

EDID EPROM from 3.3V to 5.5V. VL is connected to the

same supply as the system MCU. All pins going to the

HDMI/DVI connectors are ESD-protected to ±6kV

Human Body Model (HBM).

The MAX4929E has two enable inputs. The enable

function allows the device to operate in normal mode or

go into a high-Z state. It is possible to control two

MAX4929Es with a single control bit, creating a 4:1

equivalent switch using a minimum of external compo-

nents (see Figure 6).

Supply or signals sequencing are not required for the

MAX4929E. Supply voltages V+, VL, and CLP can be

applied in any order. Signals can be applied in any

order as well.

Analog Switch

The MAX4929E features a voltage clamp function for the

two 2:1 switch. Inputs to SCL_/SDA_ are V+ level compat-

ible. Maximum output voltages of SCLO/SDAO are

clamped to CLP. For optimum performance connect the

EDID EPROM supply voltage to CLP (see Figure 6). For

proper operation of the voltage clamp, connect

SCLO/SDAO to CLP through the pullup resistors. For

maximum output range, connect CLP to V+. The output of

the switch is connected to the EDID EPROM, voltages

from 3V to 5.5V are expected.

Logic Inputs

VL is the supply to input logic HIZ_, SEL, and HPD.

Connect VL to the same supply as the system MCU for

compatibility.

V+ is the supply to the input logic of the HPIR1 and

HPIR2 inputs.

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