PCA9527DP 데이터 시트보기 (PDF) - NXP Semiconductors.

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PCA9527DP

3-channel bidirectional bus extender for HDMI, I2C-bus and SMBus

NXP Semiconductors. 

NXP Semiconductors

PCA9527

3-channel bidirectional bus extender for HDMI, I2C-bus and SMBus

3.3 V

10 kΩ

(optional)

HDMI

RECEIVER

0.1 µF

0.1 µF

10 kΩ 10 kΩ 10 kΩ

VCC(B) VCC(A)

PCA9527

SDAB

SDAA

SCLB

SCLA

CECB

CECA

EN

GND

Fig 7. Sink or LCD TV application

10 kΩ

5V

47 kΩ

HDMI cable

22 Ω

DDC line

22 Ω

LCD TV

DVD (source)

PCA9507

PCA9512A

PCA9515

PCA9517

PCA9527

002aad973

According to Figure 5, when port A of the PCA9527 is pulled LOW by a driver on the

I2C-bus, a comparator detects the falling edge when it goes below 0.3VCC(A) and causes

the internal driver on port B to turn on, causing port B to pull down to about 0.5 V. When

port B of the PCA9527 falls, first a CMOS hysteresis type input detects the falling edge

and causes the internal driver on port A to turn on and pull the port A pin down to ground.

In order to illustrate what would be seen in a typical application, refer to Figure 11 and

Figure 12.

If the bus master in Figure 5 were to write to the slave through the PCA9527, waveforms

shown in Figure 11 would be observed on the A bus. This looks like a normal I2C-bus

transmission except that the HIGH level may be as low as 2.7 V, and the turn on and turn

off of the acknowledge signals are slightly delayed.

The master drives the B bus to ground or lets it float to VCC(B) as it sends data to the slave

at the falling edge of the 8th clock, master releases SDAB on the B bus and slave pulls

SDAA on the A bus to ground, causing the PCA9527 to pull SDAB on the B bus to 0.5 V.

At the falling edge of the 9th clock, the master again drives the B bus and slave releases

the A bus.

Multiple PCA9527 port A sides can be connected in a star configuration (Figure 8),

allowing all nodes to communicate with each other.

Multiple PCA9527s can be connected in series (Figure 9) as long as port A is connected

to port B. I2C-bus slave devices can be connected to any of the bus segments. The

number of devices that can be connected in series is limited by repeater

delay/time-of-flight considerations on the maximum bus speed requirements.

PCA9527_1

Product data sheet

Rev. 01 — 29 June 2009

© NXP B.V. 2009. All rights reserved.

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