Overview
The PCA9515D,118 is a BiCMOS integrated circuit designed by NXP USA Inc. for use in I²C-bus and SMBus systems. This component is intended to extend the capabilities of I²C-bus systems by buffering both the data (SDA) and clock (SCL) lines, thereby enabling the connection of more devices or the extension of bus lengths. Although the PCA9515D is no longer manufactured, it remains relevant for existing designs and legacy systems.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VCC supply voltage | 3.0 | 3.3 | 3.6 | V | |
| HIGH-level supply current | VCC = 3.6 V; SDAn = SCLn = VCC | 5 | mA | ||
| LOW-level supply current | VCC = 3.6 V; one SDA and one SCL = GND | 5 | mA | ||
| Clock frequency | 0 Hz | 400 kHz | |||
| I²C-bus capacitance | 400 pF | ||||
| Package types | SO8, TSSOP8 (MSOP8) | ||||
| ESD protection | 2000 V HBM, 200 V MM, 1000 V CDM |
Key Features
- Bidirectional buffer for I²C-bus and SMBus systems
- Supports Standard-mode and Fast-mode I²C-bus devices and multiple masters
- Lock-up free operation with arbitration and clock stretching across the repeater
- Active HIGH repeater enable input
- Open-drain input/outputs
- Powered-off high-impedance I²C-bus pins
- 5.5 V tolerant I²C-bus (SCLn, SDAn) and enable (EN) pins
Applications
The PCA9515D is suitable for various applications where I²C-bus or SMBus systems need to be extended or segmented. This includes:
- Extending I²C-bus lengths to accommodate more devices or longer cable runs
- Isolating different segments of an I²C-bus to prevent bus loading issues
- Mixing different voltage levels (e.g., 3.3 V and 5 V) on different segments of the bus
- Supporting mixed-speed buses (e.g., 100 kHz and 400 kHz)
Q & A
- What is the primary function of the PCA9515D?
The PCA9515D is an I²C-bus repeater designed to extend the capabilities of I²C-bus systems by buffering both the data and clock lines. - What are the supported I²C-bus modes?
The PCA9515D supports both Standard-mode and Fast-mode I²C-bus devices. - What is the maximum clock frequency supported by the PCA9515D?
The maximum clock frequency supported is 400 kHz. - What are the package options for the PCA9515D?
The PCA9515D is available in SO8 and TSSOP8 (MSOP8) packages. - Does the PCA9515D provide ESD protection?
Yes, it provides ESD protection exceeding 2000 V HBM, 200 V MM, and 1000 V CDM. - Can the PCA9515D handle mixed voltage levels on the bus?
Yes, it can handle mixed voltage levels, such as 3.3 V and 5 V, on different segments of the bus. - Is the PCA9515D still in production?
No, the PCA9515D is no longer manufactured but can still be used in existing designs and legacy systems. - What is the significance of the 'A' version (PCA9515A) of this component?
The PCA9515A has a wider voltage range (2.3 V to 3.6 V) and is recommended for applications where power is secured to the repeater but an active bus remains on either set of SCLn/SDAn pins. - How does the PCA9515D prevent lock-up conditions?
The PCA9515D prevents lock-up conditions by setting the output pull-down and input threshold of each internal buffer to prevent lock-up from occurring. - Can the PCA9515D be used in series with other I²C-bus repeaters?
The PCA9515 cannot be used in series with certain other repeaters like PCA9510A/9511A/9513A/9514A but can be used in series with itself and other compatible repeaters.
