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PCA9507 데이터시트 PDF




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부품번호 PCA9507 기능
기능 2-wire serial bus extender
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PCA9507 데이터시트, 핀배열, 회로
PCA9507
2-wire serial bus extender for HDMI DDC I2C-bus and SMBus
Rev. 01 — 7 February 2008
Product data sheet
1. General description
www.DataSheet4U.com
The PCA9507 is a 2-wire serial bus extender providing 3.3 V to 5 V level shift that allows
up to 18 meters bus extension for reliable DDC, I2C-bus or SMBus applications. While
retaining all the operating modes and features of the I2C-bus system during the level
shifts, it also permits extension of the I2C-bus by providing bidirectional buffering for both
the data (SDA) and the clock (SCL) line as well as the rise time accelerator on port A
enabling the bus to drive a load up to 1400 pF or distance of 18 m on port A, and 400 pF
on port B. Using the PCA9507 enables the system designer to isolate bus capacitance to
meet HDMI DDC version 1.3 distance specification. The SDA and SCL pins are
overvoltage tolerant and are high-impedance when the PCA9507 is unpowered.
The port B drivers with static level offset behave much like the drivers on the PCA9515
device, while the port A drivers integrate the rise time accelerator, sink more current and
eliminate the static offset voltage. This results in a LOW on port B translating into a nearly
0 V LOW on port A. The static level offset design of the port B I/O drivers prevent them
from being connected to another device that has rise time accelerator including the
PCA9510, PCA9511, PCA9512, PCA9513, PCA9514, PCA9515, PCA9516A, PCA9517
(B-side), or PCA9518. The port A sides of two or more PCA9507s can be connected
together, however, to allow a star topography with port A on the common bus, and port A
can be connected directly to any other buffer with static or dynamic offset voltage. Multiple
PCA9507s can be connected in series, port A to port B, with no build-up in offset voltage
with only time of flight delays to consider. Rise time accelerator on port A is turned on
when input threshold is above 0.3VCC(A).
The PCA9507 drivers are not enabled unless VCC(A) and VCC(B) are above 2.7 V. The EN
pin can also be used to turn the drivers on and off under system control. Caution should
be observed to only change the state of the enable pin when the bus is idle. The output
pull-down on the port B internal buffer LOW is set for approximately 0.5 V, while the input
threshold of the internal buffer is set about 70 mV lower (0.43 V). When the port B I/O is
driven LOW internally, the LOW is not recognized as a LOW by the input. This prevents a
lock-up condition from occurring.
2. Features
I 2 channel, bidirectional buffer isolates capacitance allowing 1400 pF on port A and
400 pF on port B
I Exceeds 18 meters (above the maximum distance for HDMI DDC)
I Rise time accelerator and normal I/O on port A
I Static level offset on port B
I Voltage level translation from 2.7 V to 5.5 V
I Upgrade replacement over PCA9517 for cable application




PCA9507 pdf, 반도체, 판매, 대치품
NXP Semiconductors
PCA9507
2-wire serial bus extender for HDMI DDC I2C-bus and SMBus
www.DataSheet4U.com
VCC(B)
0.3VCC(B)
port B
0.4 V
VCC(A)
0.3VCC(A)
port A
0.5 V
0V
0.7VCC(A)
0V
002aad435
Fig 4. Port A and port B I/O levels
When port B falls first and goes below 0.3VCC(B) the port A driver is turned on and port A
pulls down to 0 V. As port A falls below 0.3VCC(A) the port B pull-down pulls port B down to
about 0.5 V. Port B falls below 0.4 V because it is not possible to know who is driving the
port A LOW, so the PCA9507 direction control assumes that port A is controlling the part
unless port B falls below 0.4 V. When the port B voltage is 0.4 V the port A driver of the
PCA9507 is on and holds port A down nearly 0 V. As the port B voltage rises because the
external driver turns off, the port B voltage rises up to ~0.5 V because port A is LOW;
once port B rises to ~0.5 V the port A pull-down driver turns off. Then port A rises with a
rise time determined by the RC of port A when it crosses the port A threshold ~0.3VCC(A)
the port B driver is turned off and the rising edge accelerator is turned on, which causes a
faster rising edge until it reaches the turn-off point for the rising edge accelerator
~0.7VCC(A). Then it continues to rise at the slower rate determined by the RC of port A.
When the port B driver turns off, port B rises with the RC of port B.
VCC(A) powers the port A I/Os and the 0.3VCC(A) reference for port A as well as the port A
power good detect circuit. VCC(B) powers the rest of the chip including the port B I/Os and
the support functions. Figure 4 illustrates the threshold and I/O levels for port A and
port B.
6.1 Enable
The EN pin is active HIGH with an internal ~100 kpull-up to VCC(B) and allows the user
to select when the buffer is active. This can be used to isolate the line when the HDMI
DDC transmitter or receiver is not ready, or from a badly behaved slave on power-up until
after the system power-up reset. It should never change state during an I2C-bus operation
because disabling during a bus operation will hang the bus and enabling part way through
a bus cycle could confuse the I2C-bus parts being enabled. The enable pin should only
change state when the global bus and the buffer port are in an idle state to prevent system
failures.
6.2 Rise time accelerators
PCA9507 has rise time accelerators on port A only. During port A positive bus transitions
a current source is switched on to quickly slew the SDAA and SCLA lines HIGH once the
input level of 0.3VCC(A) is exceeded for the PCA9507 and turns off as the 0.7VCC(A)
voltage is approached.
PCA9507_1
Product data sheet
Rev. 01 — 7 February 2008
© NXP B.V. 2008. All rights reserved.
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PCA9507 전자부품, 판매, 대치품
NXP Semiconductors
PCA9507
2-wire serial bus extender for HDMI DDC I2C-bus and SMBus
7. Application design-in information
A typical application is shown in Figure 6. In this example, the system master is running
on a 3.3 V I2C-bus while the slave is connected to a 5 V bus. Both buses run at 400 kHz.
Master devices can be placed on either bus. HDMI DDC applications for DVD/R and
LCD TV are shown in Figure 7 and Figure 8, respectively. In these applications the HDMI
transmitter or receiver is 3.3 V, while the DDC line is 5 V, PCA9507 behaves like a voltage
level shift, a buffer and long cable bus extender to ensure signal integrity for accessing the
EDID on the DDC line.
www.DataSheet4U.com
3.3 V
5V
10 k
SDA
SCL
BUS
MASTER
400 kHz
10 k
10 k
VCC(B) VCC(A)
SDAB
SDAA
SCLB
SCLA
PCA9507
EN
10 k
SDA
SCL
SLAVE
400 kHz
bus B
Fig 6. Typical application
bus A
002aad403
3.3 V
10 k
(optional)
HDMI
TRANSMITTER
10 k10 k
0.1 µF
0.1 µF
VCC(B) VCC(A)
PCA9507
SDAB
SDAA
SCLB
SCLA
EN
GND
1.5 k
to
2.0 k
1.5 k
to
2.0 k
5V
22
HDMI cable
DDC line
22
DVD/R or STB
Fig 7. Source or DVD/R, STB application
LCD TV (sink)
PCA9507
PCA9512A
PCA9517
PCA9515
002aad404
3.3 V
10 k
(optional)
10 k10 k
HDMI
RECEIVER
Fig 8. Sink or LCD TV application
PCA9507_1
Product data sheet
0.1 µF
0.1 µF
VCC(B) VCC(A)
PCA9507
SDAB
SDAA
SCLB
SCLA
EN
GND
5V
47 k
22
HDMI cable
DDC line
22
LCD TV
Rev. 01 — 7 February 2008
DVD (source)
PCA9507
PCA9512A
PCA9517
PCA9515
002aad405
© NXP B.V. 2008. All rights reserved.
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