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SML2120 数据表(PDF) 9 Page - Summit Microelectronics, Inc. |
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SML2120 数据表(HTML) 9 Page - Summit Microelectronics, Inc. |
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9 / 32 page ![]() SML2120 I2C 2-Wire Serial Interface AC Operating Characteristics Summit Microelectronics 2066 6.3 1/22/04 9 – I2C 2-WIRE SERIAL INTERFACE AC OPERATING CHARACTERISTICS 100kHz 400kHz Symbol Parameter Conditions Min Max Units Min Max Units fSCL SCL clock frequency 0 100 kHz 0 400 kHz tLOW Clock period low 4.7 µs1.3 µs tHIGH Clock period high 4.0 µs0.6 µs tBUF Bus free time1 1. Guaranteed by the design. Before new transmission 4.7 µs1.3 µs tSU:STA Start condition setup time 4.7 µs0.6 µs tHD:STA Start condition hold time 4.0 µs0.6 µs tSU:STO Stop condition setup time 4.0 µs0.6 µs tAA Clock edge to valid output SCL low to valid SDA (cycle n) 0.3 3.5 µs0.3 0.9 µs tDH Data out hold time SCL low (cycle n+1) to SDA change 0.3 µs0.3 µs tR SCL and SDA rise time1 1000 ns 1000 ns tF SCL and SDA fall time1 300 ns 300 ns tSU:DAT Data in setup time 250 ns 150 ns tHD:DAT Data in hold time 0 ns 0 ns tI Noise filter SCL and SDA1 Noise suppression 100 ns 100 ns tWR Write cycle time 10 ms 10 ms (Over recommended operating conditions, unless otherwise noted. All voltages are relative to VSS.) t R t F t HIGH t LOW t SU:STA t HD:STA t SU:DAT t HD:DAT t SU:STO t BUF t DH t AA SCL SDA (IN) SDA (OUT) t W R (For W rite Operation Only) Basic I2C Timing Diagram |
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