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LM4947 Datasheet(PDF) 9 Page - Texas Instruments |
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LM4947 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 37 page LM4947, LM4947TLEVAL www.ti.com SNAS349D – JUNE 2006 – REVISED MAY 2013 I 2C(1)(2) The following specifications apply for VDD = 5V and 3.3V, TA = 25°C unless otherwise specified. Symbol Parameter Conditions LM4947 Units (Limits) Typical(3) Limits(4) t1 Clock Period 2.5 µs (max) t2 Clock Setup Time 100 ns (min) t3 Data Hold Time 100 ns (min) t4 Start Condition Time 100 ns (min) t5 Stop Condition Time 100 ns (min) 0.7xI2C VIH SPI Input Voltage High V (min) VDD 0.3xI2C VIL SPI Input Voltage Low V (max) VDD (1) Operating Ratings indicate conditions for which the device is functional, but do not ensure specific performance limits. For ensured specifications and test conditions, see the Electrical Characteristics. The ensured specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions. (2) All voltages are measured with respect to the ground pin, unless otherwise specified. (3) Typical specifications are specified at +25°C and represent the most likely parametric norm. (4) Tested limits are specified to AOQL (Average Outgoing Quality Level). I 2C Protocol Information The I2C address for the LM4947 is determined using the ID_ENB pin. The LM4947's two possible I2C chip addresses are of the form 111110X10 (binary), where X1 = 0, if ID_ADDR is logic LOW; and X1 = 1, if ID_ENB is logic HIGH. If the I2C interface is used to address a number of chips in a system, the LM4947's chip address can be changed to avoid any possible address conflicts. Figure 4. I2C Bus Format Figure 5. I2C Timing Diagram Copyright © 2006–2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM4947 LM4947TLEVAL |
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