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PDF PCA9516A Data sheet ( Hoja de datos )
| Número de pieza | PCA9516A | |
| Descripción | 5-channel I2C hub | |
| Fabricantes | NXP Semiconductors | |
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INTEGRATED CIRCUITS
PCA9516A
5-channel I2C hub
Product data sheet
Supersedes data of 2004 May 28
Philips
Semiconductors
2004 Sep 29
1 page  
Philips Semiconductors
5-channel I2C hub
Product data sheet
PCA9516A
FUNCTIONAL DESCRIPTION
The PCA9516A is a five way hub repeater, which enables I2C and
similar bus systems to be expanded with only one repeater delay
and no functional degradation of system performance.
The PCA9516A contains five bi-directional, open drain buffers
specifically designed to support the standard low-level-contention
arbitration of the I2C-bus. Except during arbitration or clock
stretching, the PCA9516A 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.
I2C Systems
As with the standard I2C system, pull-up resistors are required to
provide the logic HIGH levels on the Buffered bus. (Standard
open-collector configuration of the I2C-bus). The size of these
pull-up resistors depends on the system, but each side of the
repeater must have a pull-up resistor. This part is designed to work
with standard mode and fast mode I2C devices in addition to SMBus
devices. Standard mode I2C devices only specify 3 mA output drive,
this limits the termination current to 3 mA in a generic I2C system
where standard mode devices and multiple masters are possible.
Please see Application Note AN255 “I2C & SMBus Repeaters, Hubs
and Expanders” for additional information on sizing resistors and
precautions when using more than one PCA9515A/PCA9516A in a
system or using the PCA9515A/16A 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 I2C-bus while the slave is
connected to a 5 V bus. All buses run at 100 kHz unless slave 3 is
isolated and then the master bus and slave 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 VCC through appropriately sized
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 VCC through appropriately sized resistors.
The PCA9516A is 5.5 V tolerant so it does not require any additional
circuitry to translate between the different bus voltages.
When one side of the PCA9516A is pulled LOW by a device on the
I2C-bus, a CMOS hysteresis type input detects the falling edge and
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
PCA9516A will typically be at VOL = 0.5 V.
3.3 V
5V
SDA
SCL
BUS
MASTER
400 kHz
SDA0 SDA1
SCL0 SCL1
EN1
EN2
EN3
EN4
SDA2
SCL2
PCA9516A
3.3 V
SDA
SLAVE 1
SCL
400 kHz
SDA
SLAVE 2
SCL
400 kHz
5V
SDA3
SCL3
SDA
SLAVE 3
SCL
100 kHz
3.3 V or 5 V
SDA4
SCL4
Figure 4. Typical application
SW02249
2004 Sep 29
5
5 Page 
Philips Semiconductors
5-channel I2C hub
Product data sheet
PCA9516A
TSSOP16: plastic thin shrink small outline package; 16 leads; body width 4.4 mm
SOT403-1
2004 Sep 29
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet PCA9516A.PDF ] | |
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