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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TMS320DM643 датащи(PDF) 112 Page - Texas Instruments |
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TMS320DM643 датащи(HTML) 112 Page - Texas Instruments |
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112 / 160 page  www.ti.com 25 23 19 18 22 27 20 21 17 18 28 Stop Start Repeated Start Stop SDA SCL 16 26 24 TMS320DM643 Video/Imaging Fixed-Point Digital Signal Processor SPRS269A – FEBRUARY 2005 – REVISED APRIL 2005 Table 5-36. Switching Characteristics for I2C Timings (1) (see Figure 5-37) –500 –600 NO. PARAMETER STANDARD UNIT FAST MODE MODE MIN MAX MIN MAX 16 tc(SCL) Cycle time, SCL 10 2.5 µs Delay time, SCL high to SDA low (for a repeated START 17 td(SCLH-SDAL) 4.7 0.6 µs condition) Delay time, SDA low to SCL low (for a START and a repeated 18 td(SDAL-SCLL) 4 0.6 µs START condition) 19 tw(SCLL) Pulse duration, SCL low 4.7 1.3 µs 20 tw(SCLH) Pulse duration, SCL high 4 0.6 µs 21 td(SDAV-SDLH) Delay time, SDA valid to SCL high 250 100 ns 22 tv(SDLL-SDAV) Valid time, SDA valid after SCL low (For I2C bus™ devices) 0 0 0.9 µs Pulse duration, SDA high between STOP and START con- 23 tw(SDAH) 4.7 1.3 µs ditions 24 tr(SDA) Rise time, SDA 1000 20 + 0.1Cb(1) 300 ns 25 tr(SCL) Rise time, SCL 1000 20 + 0.1Cb(1) 300 ns 26 tf(SDA) Fall time, SDA 300 20 + 0.1Cb(1) 300 ns 27 tf(SCL) Fall time, SCL 300 20 + 0.1Cb(1) 300 ns 28 td(SCLH-SDAH) Delay time, SCL high to SDA high (for STOP condition) 4 0.6 µs 29 Cp Capacitance for each I2C pin 10 10 pF (1) Cb = total capacitance of one bus line in pF. If mixed with HS-mode devices, faster fall-times are allowed. Figure 5-37. I2C Transmit Timings 112 DM643 Peripheral Information and Electrical Specifications |
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