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TCA9802DGKT Fiches technique(PDF) 1 Page - Texas Instruments |
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TCA9802DGKT Fiches technique(HTML) 1 Page - Texas Instruments |
1 / 36 page TCA9802 GND 4 1 VCCA 3 SDAA 2 SCLA 7 SCLB 6 SDAB I 2C or SMBus Master (e.g. Processor) 5 EN 8 VCCB I 2C Slave Devices Copyright © 2017, Texas Instruments Incorporated Product Folder Order Now Technical Documents Tools & Software Support & Community An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. TCA9802 SCPS266 – MARCH 2017 TCA9802 Level-Translating I2C Bus Buffer/Repeater 1 1 Features 1 • Two-Channel Bidirectional Buffer • Integrated Current Source on B-side, Requires No External B-Side Resistors • Ultra-Low Power Consumption • No Static-Voltage Offset, Low VOL • I2C Bus and SMBus Compatible • Operating Supply Voltage Range of 0.8 V to 3.6 V on A-side • Operating Supply Voltage Range of 1.65 V to 3.6 V on B-side • Active-High Repeater Enable Input • Powered-Off High Impedance I2C Bus Pins on A- Side • Powered-Off Back-Power Protection I2C Bus Pins • Support for Clock Stretching and Multiple Master Arbitration • Family of Current Source Options from 0.5 mA to 3 mA 2 Applications • Servers • Routers (Routing Equipment) • Industrial Equipment • Personal Computers • Power-Sensitive Applications 3 Description The TCA9802 is a dual-channel bidirectional buffer intended for I2C bus and SMBus/PMBus systems. It provides bidirectional level shifting (up-translation and down-translation) between low voltages (down to 0.8 V) and higher voltages (1.65 V to 3.6 V). The TCA9802 features an internal current source on the B-side of the device, allowing the removal of external pull-up resistors on the B-side. The current source also provides an improved rise time and ultra-low power consumption. The TCA9802 is able to provide true buffering (rather than a pass-FET solution) without using a static voltage offset or incremental offset. This means that the VOL on both the A and B sides of the TCA9802 are very low (approximately 0.2 V), helping to eliminate communication issues as a result of fixed VIL thresholds. Another key feature of the TCA9802 is that there are no power sequencing requirements, or power supply dependencies. VCCA can be greater than, less than, or equal to VCCB. This gives the system designer flexibility with how the TCA9802 is used. The TCA9802 is part of a four device family with varying current source strengths (see the Device Comparison Table). Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) TCA9802 VSSOP (8) 3.00 mm × 3.00 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Device Comparison Part Number ICS: Current Source Value TCA9800 0.5 mA TCA9801 1 mA TCA9802 2 mA TCA9803 3 mA Simplified Schematic |
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