IP4787CZ32 datasheet(21/36 Pages) NEXPERIA

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IP4787CZ32

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IP4787CZ32

Rev. 3 — 19 December 2014

20 of 35

NXP Semiconductors

IP4787CZ32

DVI and HDMI interface ESD and overcurrent protection

9.3 Operating and standby modes

The operating mode of IP4787CZ32 depends on the availability of the VCC(5V0) and

VCC(SYS) supply voltages and on the state of the ACTIVE input signal. Without availability

of both supplies, IP4787CZ32 is in Standby mode. As soon as VCC(5V0) and VCC(SYS) are

within the range specified in Section 6, the part is in an operating mode that can be

controlled via the ACTIVE input signal. In case ACTIVE is LOW, only the CEC buffer is

active and enabled to receive or send CEC commands. All other outputs are in a

high-ohmic state. A HIGH input signal enables all parts of IP4787CZ32 and puts the

device into full operating mode.

[1]

X = Don’t care (either LOW or HIGH level); L = LOW-level input; H = HIGH-level input

If no CEC Standby mode is required, or if no special Power-down modes are desired, the

ACTIVE pin can be pulled HIGH to VCC(5V0) or VCC(SYS) for continuous HDMI and CEC

operation as soon as the supplies are aviailable.

Strapping the ACTIVE = VCC(SYS) =VDD of ASIC guarantees that all interface signals

ending with the suffix ‘_SYS’ on the system side are disabled when VCC(SYS) goes LOW,

protecting the ASIC I/O signals from exceeding its local VDD. In this mode, even if VCC(5V0)

is powered, HDMI_5V0_CON goes active and hot plug events can be detected only when

the ASIC power supply rail is on.

Strapping ACTIVE = VCC(5V0) is the most basic configuration where the buffers are

enabled whenever the local VCC(5V0) and VCC(SYS) supplies reach minimum operating

levels.

Table 10.

IP4787CZ32 operating modes

VCC(SYS)

VCC(5V0)

ACTIVE[1] Mode

Description

< 1.1 V

< 4.5 V

Standby mode

all outputs high-ohmic

 1.1 V

 4.5 V

CEC Standby mode

CEC circuit active;

all other outputs high-ohmic

full operating mode

all functional blocks active

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