PCA9516APW - 5-Channel 400kHz I2C Bus Hub | NXP
MPN: PCA9516APW ✓ AktifPCA9516APW Ringkasan
An I2C bus hub is an interface IC that regenerates and buffers SDA and SCL signals between a controller and multiple bus segments. In the product hierarchy, a bus hub is a type of I2C interface controller, interface IC, and semiconductor. This buffering approach reduces the loading presented to the upstream controller, separates downstream capacitive loads, and permits cable or board-distance extension where the original I2C bus would otherwise exceed its capacitance limit.
Key features include five bidirectional repeater channels, active-HIGH individual repeater enable inputs, lock-up-free operation, support for arbitration and clock stretching across the repeater, and powered-off high-impedance I2C pins. The device accommodates Standard-mode and Fast-mode I2C devices and multiple controllers. Its operating supply range is identified by NXP as beginning at 2.3 V, while the available search results specifically describe 2.5 V and 3.3 V support.
Each downstream segment can accommodate up to 400 pF. This is important because I2C uses open-drain signaling, and capacitance on SDA and SCL raises rise time and can cause timing failures. The PCA9516A architecture isolates each buffered bus segment, allowing unused channels to be disabled independently. Its powered-off high-impedance behavior helps avoid unwanted bus contention during shutdown or partial power-down conditions.
Typical uses include extending sensor and EEPROM networks, isolating industrial control modules, supporting SMBus systems, and distributing clock and data to separate I2C branches. The hub is especially useful when multiple relatively slow devices create substantial bus capacitance or when a PCB layout requires electrical separation between controller and peripheral buses.
Designers should connect pull-up resistors to each bus segment and place them in accordance with the bus voltage, capacitance, and rise-time requirements. Trace lengths, connector capacitance, and leakage current must be included in the worst-case electrical assessment. Disabled channels should not be assumed to provide isolation unless the enable state and powered-off pin behavior are verified for the operating condition.
This page combines verified manufacturer and distributor information with practical bus-extension guidance, pricing context, package details, and replacement analysis. It is intended to help engineers determine whether a five-channel buffered hub is appropriate before committing a board design to the TSSOP-16 footprint.
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Minta AlternatifPCA9516APW Spesifikasi
| Number of Channels | 5 channels |
| Maximum I2C Bus Data Rate | 400 kHz |
| Bus Type | I2C and SMBus |
| Maximum Downstream Bus Capacitance per Channel | 400 pF |
| Minimum Operating Supply Voltage | 2.3 V |
| Supported Supply Voltage | 2.5 V and 3.3 V |
| Kemasan | 16-pin TSSOP |
| Jenis Pemasangan | Surface mount |
| I2C Modes | Standard-mode and Fast-mode |
| Controller Support | Multiple controllers |
| Input and Output Type | Open-drain |
| Repeater Enable Polarity | Active-HIGH |
| Powered-Off Pin State | High impedance |
| Arbitration Support | Supported |
| Clock Stretching Support | Supported across the repeater |
| Device Type | CMOS integrated circuit |
Panduan Konfigurasi Pin PCA9516APW 16-pin tssop
Konfigurasi pin untuk PCA9516APW (16-pin tssop pakai). Penomeran pin, fungsi, dan garis bentuk koneksi ditakrifkan dalam dokumen pengeluar. Rujuk dokumen untuk kebentuk dan pedoman pengasman.
Tiada data garisan pin yang diperoleh untuk PCA9516APW.
Rujuk kepada lembaran data untuk konfigurasi pin penuh.
Aplikasi Biasa
PCA9516APW patut untuk 6 aplikasis: Industrial Sensor Bus Extension, EEPROM and Memory Expansion, SMBus Management Network, Multi-Branch Test and Measurement System, Robotics and Automation Control, Portable and Wearable Module Interconnect.
Industrial Sensor Bus Extension
The PCA9516APW fits industrial sensor networks where multiple branches carry slower I2C peripherals and long wiring increases capacitance. It buffers SDA and SCL into five isolated channels, each specified for up to 400 pF, while retaining operation up to 400 kHz. This allows a controller to communicate with separately routed sensor groups without presenting the combined load of every cable and connector directly to one bus segment. Independent active-HIGH enables let unused branches be disconnected, and open-drain signaling preserves compatibility with standard I2C pull-up arrangements. Designers should calculate total branch capacitance and select pull-up resistance for the slowest required rise time.
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EEPROM and Memory Expansion
The PCA9516APW is suitable for systems that divide several EEPROM or other memory banks across separate PCB branches. Each of its five bidirectional channels can support an I2C bus with up to 400 pF, reducing the effective capacitance presented to the originating controller compared with one long combined bus. The 400 kHz maximum data rate accommodates Standard-mode and Fast-mode devices, while clock-stretching and arbitration support improve interoperability. Because all I2C branches require correct pull-up placement, the designer should keep pull-ups near the powered end of each segment and verify that powered-off branches remain high impedance.
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SMBus Management Network
The PCA9516APW can segment SMBus management traffic where clock and data lines must reach several low-speed devices across separated bus sections. Its five bidirectional repeater channels retain the open-drain bus behavior and support operation up to 400 kHz, including arbitration and clock stretching across the repeater. This is useful when management devices are distributed across a chassis or when connector and cable capacitance makes a single long SMBus segment difficult to maintain. Pull-up sizing must use the actual bus voltage and worst-case capacitance, and the verified operating-temperature and absolute-maximum limits should be checked before deployment.
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Multi-Branch Test and Measurement System
The PCA9516APW supports modular test and measurement equipment in which separate instrument cards communicate through I2C control buses. Its five buffered channels provide a practical way to isolate up to five 400 pF downstream buses while maintaining a 400 kHz communication ceiling. The individual active-HIGH enables allow unused or unpowered branches to be managed deliberately, and the powered-off high-impedance pin characteristic helps avoid contention. PCB layout should preserve short return paths and place each segment's pull-up resistors near its bus connector. Engineers must also verify that the target controller supports the clock-stretching behavior expected from all connected peripherals.
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Robotics and Automation Control
The PCA9516APW fits robot and factory-control boards where sensors and actuators are distributed among several harnesses. Five isolated I2C branches can each accommodate up to 400 pF, making the hub useful when cable and connector loading would otherwise compromise a shared 400 kHz bus. The active-HIGH per-channel enable controls provide a way to manage unused segments, while arbitration and clock stretching across the repeater support mixed peripheral behavior. Robust layout and pull-up placement are essential because long industrial harnesses add capacitance and susceptibility to electrical noise. Exact environmental ratings were not supplied in the verified data and must be checked against the system requirements.
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Portable and Wearable Module Interconnect
The PCA9516APW can separate compact sensor or accessory modules when a portable device uses multiple short I2C branches with different power states. The hub's five channels support up to 400 pF each and operation up to 400 kHz, while individual active-HIGH enables permit unused modules to remain isolated. Its powered-off high-impedance behavior is particularly relevant when one branch loses power before the controller. The TSSOP-16 package also supports compact surface-mounted layouts. However, the verified data does not provide the full temperature range or quiescent-current values, so a wearable designer should verify those specifications and confirm the minimum 2.3 V operating supply requirement against the battery-regulated rail.
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Data referensi kejuruteraan untuk PCA9516APW — perbandingan, panduan rancangan, dan maklumat kesediaan
Panduan Pilihan
Catatan Desain
Do not treat the 400 pF figure as permission to connect arbitrarily long cables. The verified manufacturer information states that each of the five downstream buses can accommodate up to 400 pF, but PCB traces, connectors, cable capacitance, pull-up resistance, leakage, and the target clock rate all affect usable margin. Calculate the worst-case capacitance for every branch and verify rise time before releasing the layout.
Place pull-up resistors on each downstream bus segment according to that segment's voltage and capacitance, and connect the hub ground return close to the device. Keep SDA and SCL routing symmetrical where practical, minimize stubs between the hub and connectors, and avoid routing bus traces adjacent to switching nodes. The PCA9516A supports powered-off high-impedance pins, but that behavior does not remove the need for correct isolation and power-state planning.
The verified maximum rate is 400 kHz, so the critical design task is achieving an acceptable SCL and SDA rise time rather than simply minimizing resistance. Use the calculated bus capacitance and pull-up value to estimate the RC rise time, then include logic-level thresholds and device tolerances. Do not substitute pull-up values without checking rise time, sink-current limits, bus voltage, and the amount of leakage allowed on each of the five branches.
Maklumat Kesediaan
The supplied verified web data does not explicitly state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status for PCA9516APW. The non-automotive interface category is treated as not applicable for AEC-Q100, but that is a category assessment rather than a manufacturer qualification claim.