The NCA9539-Q1 is an automotive 24-pin CMOS device that provides 16-bit general-purpose parallel I2C bus input/output GPIO extension with AEC-Q100 Grade1 certified high reliability and wide temperature range. It is widely used in automobile cockpit entertainment system, automobile auxiliary driving system, body electronics, new energy vehicle powertrain and other modules, and is used in additional IO expansion functions such as power switch, sensor, button, LED, fan control and so on. The NCA9539-Q1 consists of two 8-bit configurations (input or output options). Input, output, and polarity reversal (high active or low active) registers. By writing the I/O configuration bit, the system host can enable I/O as input or output. Each input or output data is stored in the corresponding input or output register. The polarity of the read register can be reversed using the polarity reversal register. The system host can read all registers. When any input state is different from its corresponding input port register state, the NCA9539-Q1 drain open interrupt output is activated and used to indicate to the system master that the output state has changed. A power-on reset sets the register to its default value and initializes the device state machine. Two hardware pins (A0, A1) change the fixed I2C bus address and allow up to four devices to share the same I2C bus.
Product Features
? Automotive AEC-Q100 Grade 1 certification, operating temperature: -40℃~125℃
? Working power supply voltage range is 1.65V to 3.6V, supporting 5V level IO application
? I2C to parallel port extender
? Polarity reversal register
? Open leakage circuit low level effective interrupt output
? Compatible with most MCUs
? 16 I/O pins, 16 inputs by default
? Low standby current
? ESD protection exceeds the JESD22 standard
o 2000V Human Body Charge and Discharge Model (A114-A)
o 1000V Charging device Model (C101)
? 2 address pins, supporting 4 different addresses
? 0~400kHz clock frequency
? Latch performance exceeds 100mA
? RoHs-compliant package: TSSOP24
Application
Automotive cockpit entertainment system, ADAS, body electronics, new energy vehicle powertrain and other modules where IO expander is needed
Functional Block Diagram
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