PCA9516D,118 NXP Semiconductors, PCA9516D,118 Datasheet - Page 5

• Manufacturer Part Number: PCA9516D,118
• Description: IC I2C BUS HUB 5-CH 16SOIC
• Manufacturer: NXP Semiconductors
• Type: Bufferr

Specifications of PCA9516D,118

• Tx/rx Type: I²C Logic
• Delay Time: 75ns
• Capacitance - Input: 6pF
• Voltage - Supply: 2.3 V ~ 3.6 V
• Current - Supply: 5mA
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 935268880118; PCA9516D-T; PCA9516D-T

Philips Semiconductors
FUNCTIONAL DESCRIPTION
The PCA9516 BiCMOS integrated circuit is a five way hub repeater,
which enables I
only one repeater delay and no functional degradation of system
performance.
The PCA9516 BiCMOS integrated circuit contains five bi-directional,
open drain buffers specifically designed to support the standard
low-level-contention arbitration of the I
arbitration or clock stretching, the PCA9516 acts like five pairs of
non-inverting, open drain buffers, one for SDA and one for SCL.
Enable
The enable pins EN1 through EN4 are active HIGH and have
internal pull-up resistors. Each enable pin ENn controls its
associated SDAn and SCLn ports. When LOW, the ENn pin blocks
the inputs from SDAn and SCLn as well as disabling the output
drivers on the SDAn and SCLn pins. The enable pins should only
change state when both the global bus and the local port are in an
idle state to prevent system failures.
The active HIGH enable pins allow the use of open drain drivers
which can be wire-ORed to create a distributed enable where either
centralized control signal (master) or spoke signal (submaster) can
enable the channel when it is idle.
I
As with the standard I
provide the logic HIGH levels on the Buffered bus. (Standard
open-collector configuration of the I
pull-up resistors depends on the system, but each side of the
repeater must have a pull-up resistor. This part designed to work
with standard mode and fast mode I
devices. Standard mode I
this limits the termination current to 3 mA in a generic I
where standard mode devices and multiple masters are possible.
Under certain conditions higher termination currents can be used.
Please see Application Note AN255 “I
and Expanders” for additional information on sizing resistors and
precautions when using more than one PCA9515/PCA9516 in a
system or using the PCA9515/16 in conjunction with the P82B96.
APPLICATION INFORMATION
A typical application is shown in Figure 4. In this example, the
system master is running on a 3.3 V I
connected to a 5 V bus. All buses run at 100 kHz unless slave 3 is
isolated and then the master bus and slaves 1 and 2 can run at
400 kHz.
Any segment of the hub can talk to any other segment of the hub.
Bus masters and slaves can be located on all five segments with
400 pF load allowed on each segment.
Unused ports should be isolated by holding the enable pin to GND
and/or pulling SDA/SCL pins to V
2006 Sep 22
2
C Systems
5-channel I
2
C and similar bus systems to be expanded with
2
2
C system, pull-up resistors are required to
C hub
2
C devices only specify 3 mA output drive,
CC
2
2
C-bus). The size of these
through appropriately sized
C devices in addition to SMBus
2
2
2
C-bus while the slave is
C & SMBus Repeaters, Hubs
C-bus. Except during
2
C system
5
resistors. The primary bus master is normally connected to
SDA0/SCL0. If the SDA0/SCL0 port is not used, the pins need to be
pulled to V
The PCA9516 is 5 V tolerant so it does not require any additional
circuitry to translate between the different bus voltages.
When one side of the PCA9516 is pulled LOW by a device on the
I
causes an internal driver on the other side to turn on, thus causing
the other side to also go LOW. The side driven LOW by the
PCA9516 will typically be at V
2
C-bus, a CMOS hysteresis type input detects the falling edge and
BUS
MASTER
400 kHz
CC
SDA
SCL
through appropriately sized resistors.
Figure 4. Typical application
3.3 V
SDA0
SCL0
EN1
EN2
EN3
EN4
PCA9516
OL
= 0.5 V.
SDA1
SDA2
SCL1
SCL2
SDA3
SDA4
SCL3
SCL4
3.3 V or 5 V
3.3 V
5 V
5 V
PCA9516
Product data sheet
SDA
SCL
SDA
SCL
SDA
SCL
SLAVE 1
400 kHz
SLAVE 2
400 kHz
SLAVE 3
100 kHz
SW00923