This TCA9509 integrated circuit is an I2C bus/SMBus Repeater
for use in I2C/SMBus systems. It can also provide bidirectional
voltage-level translation (up-translation/down-translation) between low voltages (down to 0.9 V)
and higher voltages (2.7 V to 5.5 V) in mixed-mode applications. This device enables
I2C and similar bus systems to be extended, without degradation of
performance even during level shifting.
The TCA9509 buffers both the serial data (SDA) and the serial clock (SCL) signals on the
I2C bus, thus allowing 400-pF bus capacitance on the B-side. This device
can also be used to isolate two halves of a bus for voltage and capacitance.
The TCA9509 has two types of drivers – A-side drivers and B-side drivers. All inputs and
B-side I/Os are overvoltage tolerant to 5.5 V. The A-side I/Os are overvoltage tolerant to 5.5 V
when the device is unpowered (VCCB and/or VCCA = 0 V).
The bus port B drivers are compliant with SMBus I/O levels, while the A-side uses a
current sensing mechanism to detect the input or output LOW signal which prevents bus lock-up. The
A-side uses a 1 mA current source for pull-up and a 200 Ω pull-down driver. This results in a LOW
on the A-side accommodating smaller voltage swings. The output pull-down on the A-side internal
buffer LOW is set for approximately 0.2 V, while the input threshold of the internal buffer is set
about 50 mV lower than that of the output voltage LOW. When the A-side 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. The output pull-down on the B-side drives a hard LOW and the input level is set at 0.3
of SMBus or I2C-bus voltage level which enables B side to connect to any
other I2C-bus devices or buffer.
The TCA9509 drivers are not enabled unless VCCA is above 0.8 V and
VCCB is above 2.5 V. The enable (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
EN pin when the bus is idle.
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