I2C EXPANDER BREAKOUT – PCF8575

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Product Description

This 16-bit I/O expander for the two-line bidirectional
1• I2C to Parallel-Port Expander
bus (I2C) is designed for 4.5-V to 5.5-V VCC • Open-Drain Interrupt Output operation.
• Low Standby-Current Consumption of
The PCF8575C provides general-purpose remote I/O 10 ?A Maximum expansion for most microcontroller families via the I
2C
• Compatible With Most Microcontrollers interface serial clock (SCL) and serial data (SDA).
• 400-kHz Fast I
2C Bus The device features a 16-bit quasi-bidirectional
• Address by Three Hardware Address Pins for Use input/output (I/O) port (P07–P00, P17–P10), including
of up to Eight Devices latched outputs with high-current drive capability for
• Latched Outputs With High-Current Drive directly driving LEDs. Each quasi-bidirectional I/O can
Capability for Directly Driving LEDs be used as an input or output without the use of a
data-direction control signal. At power on, the I/Os
• Latch-Up Performance Exceeds 100 mA Per
are in 3-state mode. The strong pullup to VCC allows JESD 78, Class II fast-rising edges into heavily loaded outputs. This
• ESD Protection Exceeds JESD 22 device turns on when an output is written high and is
– 2000-V Human-Body Model switched off by the negative edge of SCL. The I/Os
should be high before being used as inputs. After
– 200-V Machine Model
power on, as all the I/Os are set to 3-state, all of them
– 1000-V Charged-Device Model can be used as inputs. Any change in setting of the
I/Os as either inputs or outputs can be done with the

Applications write mode. If a high is applied externally to an I/O
that has been written earlier to low, a large current
• Telecom Shelters: Filter Units (IOL) flows to GND.
• Servers