Overview
The PCA9538BS,118 is a 16-pin CMOS device manufactured by NXP USA Inc., designed to provide 8 bits of General Purpose parallel Input/Output (GPIO) expansion. This device is part of the NXP Semiconductors family of I²C-bus I/O expanders, enhancing the capability to add additional I/Os for various applications such as ACPI power switches, sensors, push-buttons, LEDs, and fans. The PCA9538BS operates on the I²C-bus and SMBus protocols, making it versatile for a wide range of uses.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VDD supply voltage | 2.3 V to 5.5 V | 2.3 | - | 5.5 | V |
| IDD supply current (operating mode) | VDD = 5.5 V; no load; fSCL = 100 kHz | - | 104 | 175 | μA |
| IstbL LOW-level standby current | Standby mode; VDD = 5.5 V; no load; VI = VSS; fSCL = 0 kHz; I/O = inputs | - | 0.25 | 1 | μA |
| IOL LOW-level output current | VOL = 0.4 V | 3 | - | 13 | mA |
| VIL LOW-level input voltage | - | -0.5 | - | 0.8 | V |
| VIH HIGH-level input voltage | - | 2.0 | - | 5.5 | V |
| Ci input capacitance | - | 5 | - | 10 | pF |
| ESD protection | - | - | - | 2000 V HBM, 1000 V CDM | - |
| Package types | - | - | - | SO16, TSSOP16, HVQFN16 | - |
Key Features
- Provides 8 bits of General Purpose parallel Input/Output (GPIO) expansion with interrupt and reset for I²C-bus/SMBus applications.
- Internal power-on reset and noise filter on SCL/SDA inputs to prevent glitches on power-up.
- Low standby current and low power consumption.
- ESD protection exceeds 2000 V HBM and 1000 V CDM.
- Latch-up testing exceeds 100 mA according to JEDEC Standard JESD78.
- Supports clock frequencies from 0 Hz to 400 kHz.
- Configurable I/Os as either inputs or outputs via the I/O configuration register.
- Polarity Inversion register allows for active HIGH or active LOW operation.
Applications
The PCA9538BS is suitable for a variety of applications, including:
- ACPI power switches
- Sensors and monitoring systems
- Push-buttons and user interfaces
- LED indicators and display systems
- Fans and motor control
- Automotive and industrial control systems
Q & A
- What is the PCA9538BS used for? The PCA9538BS is used for providing 8 bits of General Purpose parallel Input/Output (GPIO) expansion with interrupt and reset for I²C-bus/SMBus applications.
- What are the package types available for the PCA9538BS? The PCA9538BS is available in SO16, TSSOP16, and HVQFN16 packages.
- What is the voltage range for the VDD supply voltage? The VDD supply voltage ranges from 2.3 V to 5.5 V.
- What is the maximum clock frequency supported by the PCA9538BS? The PCA9538BS supports clock frequencies up to 400 kHz.
- Does the PCA9538BS have ESD protection? Yes, the PCA9538BS has ESD protection that exceeds 2000 V HBM and 1000 V CDM.
- How can the I/Os be configured on the PCA9538BS? The I/Os can be configured as either inputs or outputs by writing to the I/O configuration register.
- What is the purpose of the Polarity Inversion register? The Polarity Inversion register allows for the polarity of the Input Port register to be inverted, enabling active HIGH or active LOW operation.
- What are some common applications of the PCA9538BS? Common applications include ACPI power switches, sensors, push-buttons, LEDs, fans, and automotive and industrial control systems.
- Does the PCA9538BS have internal power-on reset? Yes, the PCA9538BS has an internal power-on reset feature.
- What is the standby current of the PCA9538BS? The standby current of the PCA9538BS is typically 0.25 μA to 1 μA in LOW-level standby mode.
