NXP Semiconductors NXP PCA961xDP differentieller 2-Kanal Mehrpunkt-I2C-Buspuffer
Die differentiellen 2-Kanal-Mehrpunkt-I²C-Buspuffer PCA961xDP von NXP sind Fast-Mode-Plus (Fm+) SMBus/I²C-Buspuffer, die den normalen Single-Ended-SMBus/I²C-Bus durch elektrisch geräuschvolle Umgebungen mithilfe einer physikalischen Schicht des differentiellen SMBus/I²C-Busses (dI²C), transparent zur SMBus/I²C-Bus-Protokollschicht, verlängern. Diese Komponenten bestehen aus zwei Single-Ended bis differentiellen Treiberkanälen für den SCL (serieller Takt), SDA (serielle Daten). Indem differentielle Übertragungsleitungen zwischen identischen dI²C-Buspuffern verwendet werden, entfernt der PCA961xDP elektrische Geräusche und Gleichtakt-Offsets, die bei Signalleitungen, die verschiedene Spannungsbereiche durchdringen müssen, mit "feindlichen" Signalen gebündelt sind oder neben elektrischen Geräuschquellen wie beispielsweise Hochleistungsstromversorgungen und elektrischen Motoren laufen, auftreten. Die PCA961xDP differentiellen 2-Kanal-Mehrpunkt-I²C-Buspuffer eignen sich ideal für raue, sehr laute Umgebungen und/oder längere Kabelanwendungen, ermöglichen mehrfache Slaves und werden bei Busgeschwindigkeiten bis zu einer Taktrate von 1MHz betrieben.Merkmale
- New dI²C-bus buffers offer improved resistance to system noise and ground offset up to 1⁄2 of supply voltage
- 2 channel dI²C (differential I2C-bus) to Fm+ single-ended buffer operating up to 1MHz with 30mA SDA/SCL drive capability
- Compatible with I2C-bus Standard/Fast-mode and SMBus, Fast-mode Plus up to 1MHz
- Single-ended I2C-bus on card side up to 540pF
- Differential I2C-bus on cable side supporting multi-drop bus
- Maximum cable length: 3m (approximately 10 feet) (longer at lower frequency)
- dI²C output: 1.5V differential output with nominal terminals
- Differential line impedance (user-defined): 100Ω nominal suggested
- Receive input sensitivity: ±200mV
- Hysteresis: ±30mV typical
- Input impedance: high-impedance (1 MΩ typical)
- Receive input voltage range: -0.5V to +5.5V
- Supports arbitration and clock stretching across the dI²C-bus buffers
- Lock-up free operation
- Powered-off and powering-up high-impedance I2C-bus pins
- Operating supply voltage (VDD(A)) range of 2.3V to 5.5V with single-ended side 5.5V tolerant
- Differential I2C-bus operating supply voltage (VDD(B)) range of 3.0V to 5.5V, with 5.5V tolerant (the best operation is at 5V)
- ESD protection exceeds 2000V HBM per JESD22-A114 and 1000V CDM per JESD22-C101
- Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100mA
- PCA9615 Features
- Hot-swap (allows insertion or removal of modules or card without disruption to bus data)
- EN signal (PCA9615 input) controls PCA9615 hot-swap sequence
- Bus idle detect (PCA9615 internal function) waits for a bus idle condition before the connection is made
Applikationen
- Monitor remote temperature/leak detectors in harsh environment
- Control of power supplies in high noise environment
- Transmission of I2C-bus between equipment cabinets
- Commercial lighting and industrial heating/cooling control
- Any application that requires long I2C-bus runs in electrically noisy environments
- Any application with multiple power suppliers and the potential for ground offsets up to 2.5V
Veröffentlichungsdatum: 2015-01-15
| Aktualisiert: 2022-11-03
