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MPL3115A2 数据表(PDF) 7 Page - Freescale Semiconductor, Inc |
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MPL3115A2 数据表(HTML) 7 Page - Freescale Semiconductor, Inc |
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7 / 44 page ![]() MPL3115A2 Sensors Freescale Semiconductor, Inc. 7 3.1 I2C Interface Characteristics Figure 3. I2C Slave Timing Diagram Table 4. I2C Slave Timing Values(1) 1. All values referred to VIH(min) and VIL(max) levels. Ref Symbol Parameter I2C Unit Condition Min Max 1fSCL SCL Clock Frequency Pull-up = 1 k C b = 400 pF 0 400 KHz 2fSCL SCL Clock Frequency Pull-up = 1 k C b = 20 pF 0 4 MHz 3tBUF Bus free time between STOP and START condition 1.3 µs 4tHD;STA Repeated START Hold Time 0.6 µs 5tSU;STA Repeated START Setup Time 0.6 µs 6tSU;STO STOP Condition Setup Time 0.6 µs 7tHD;DAT SDA Data Hold Time(2) 2. tHD;DAT is the data hold time that is measured from the falling edge of SCL, applies to data in transmission and the acknowledge. 50(3) 3. The device must internally provide a hold time of at least 300 ns for the SDA signal (with respect to the VIH(min) of the SCL signal) to bridge the undefined region of the falling edge of SCL. (4) 4. The maximum tHD;DAT must be less than the maximum of tVD;DAT or tVD;ACK by a transition time. This device does not stretch the LOW period (tLOW) of the SCL signal. ns 8tSU;DAT SDA Setup Time 100(5) 5. A fast mode I2C device can be used in a standard mode I2C system, but the requirement tSU;DAT 250 ns must then be met. This will automatically be the case if the device does not stretch the LOW period of the SCL signal. If such a device does stretch the LOW period of the SCL signal, it must output the next data bit to the SDA line tr(max) + tSU;DAT = 1000 + 250 = 1250 ns (according to the standard mode I2C specification) before the SCL line is released. Also the acknowledge timing must meet this set-up time. ns 9tLOW SCL Clock Low Time 1.3 µs 10 tHIGH SCL Clock High Time 0.6 µs 11 tr SDA and SCL Rise Time 20 + 0.1Cb (6) 6. Cb = Total capacitance of one bus line in pF. 300 ns 12 tf SDA and SCL Fall Time (3)(6)(7)(8) 7. The maximum tf for the SDA and SCL bus lines is specified at 300 ns. The maximum fall time for the SDA output stage tf is specified at 250 ns. This allows series protection resistors to be connected in between the SDA and the SCL pins and the SDA/SCL bus lines without exceeding the maximum specified tf. 8. In Fast Mode Plus, fall time is specified the same for both output stage and bus timing. If series resistors are used, designers should allow for this when considering bus timing. 20 + 0.1Cb (6) 300 ns 13 tSP Pulse width of spikes that are suppressed by internal input filter 50 ns |
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