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LP3954 Datasheet(PDF) 36 Page - Texas Instruments |
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LP3954 Datasheet(HTML) 36 Page - Texas Instruments |
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36 / 60 page  SDA SCL 1 8 2 3 7 6 5 8 10 4 9 1 7 LP3954 SNVS340D – JUNE 2005 – REVISED MARCH 2013 www.ti.com Figure 42. I2C Timing Diagram I2C Timing Parameters (VDD1,2 = 3.0 to 4.5V, VDD_IO = 1.65V to VDD1,2) Limit(1) Symbol Parameter Unit Min Max 1 Hold Time (repeated) START Condition 0.6 µs 2 Clock Low Time 1.3 µs 3 Clock High Time 600 ns 4 Setup Time for a Repeated START Condition 600 ns 5 Data Hold Time (Output direction, delay generated by LP3954) 300 900 ns 5 Data Hold Time (Input direction, delay generated by the Master) 0 900 ns 6 Data Setup Time 100 ns 7 Rise Time of SDA and SCL 20+0.1Cb 300 ns 8 Fall Time of SDA and SCL 15+0.1Cb 300 ns 9 Set-up Time for STOP condition 600 ns 10 Bus Free Time between a STOP and a START Condition 1.3 µs Cb Capacitive Load for Each Bus Line 10 200 pF (1) NOTE: Data ensured by design Autoincrement mode is available, with this possible read or write few byte with autoincreasing addresses, but LP3954 has holes in address register map, and is recommended to use autoincrement mode only for the pattern command registers. Recommended External Components OUTPUT CAPACITOR, COUT The output capacitor COUT directly affects the magnitude of the output ripple voltage. In general, the higher the value of COUT, the lower the output ripple magnitude. Multilayer ceramic capacitors with low ESR are the best choice. At the lighter loads, the low ESR ceramics offer a much lower Vout ripple that the higher ESR tantalums of the same value. At the higher loads, the ceramics offer a slightly lower Vout ripple magnitude than the tantalums of the same value. However, the dv/dt of the Vout ripple with the ceramics is much lower that the tantalums under all load conditions. Capacitor voltage rating must be sufficient, 10V or greater is recommended. Some ceramic capacitors, especially those in small packages, exhibit a strong capacitance reduction with the increased applied voltage. The capacitance value can fall to below half of the nominal capacitance. Too low output capacitance will increase the noise and it can make the boost converter unstable. INPUT CAPACITOR, CIN The input capacitor CIN directly affects the magnitude of the input ripple voltage and to a lesser degree the VOUT ripple. A higher value CIN will give a lower VIN ripple. Capacitor voltage rating must be sufficient, 10V or greater is recommended. 36 Submit Documentation Feedback Copyright © 2005–2013, Texas Instruments Incorporated Product Folder Links: LP3954 |
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