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M41T60 Folha de dados(PDF) 21 Page - STMicroelectronics |
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M41T60 Folha de dados(HTML) 21 Page - STMicroelectronics |
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21 / 27 page ![]() M41T60 DC and AC parameters Doc ID 10396 Rev 13 21/27 Figure 15. Bus timing requirements sequence Note: P = STOP and S = START Table 10. Oscillator characteristics Symbol Parameter Conditions Min Typ Max Unit VSTA Oscillator start voltage ≤ 10 seconds 1.5 V tSTA Oscillator start time VCC = 3.0 V 1 s Cg XIN capacitance 12 pF Cd XOUT capacitance 12 pF IC-to-IC frequency variation (1) 1. Reference value. TA = 25 °C, VCC = 3.0 V, CMJ-145 (CL = 6 pF, 32,768 Hz) manufactured by Citizen, CL = Cg • Cd / (Cg + Cd) –10 +10 ppm AI00589 SDA P tSU:STO tSU:STA tHD:STA SR SCL tSU:DAT tF tHD:DAT tR tHIGH tLOW tHD:STA tBUF S P Table 11. AC characteristics Symbol Parameter(1) 1. Valid for ambient operating temperature: TA = –40 to 85 °C; VCC = 1.3 to 4.4 V (except where noted). Min Max Unit fSCL SCL clock frequency 0 400 kHz tLOW Clock low period 1.3 µs tHIGH Clock high period 600 ns tR SDA and SCL rise time 300 ns tF SDA and SCL fall time 300 ns tHD:STA START condition hold time (after this period the first clock pulse is generated) 600 ns tSU:STA START condition setup time (only relevant for a repeated start condition) 600 ns tSU:DAT Data setup time 100 ns tHD:DAT (2) 2. Transmitter must internally provide a hold time to bridge the undefined region (300 ns max.) of the falling edge of SCL. Data hold time 0 µs tSU:STO STOP condition setup time 600 ns tBUF Time the bus must be free before a new transmission can start 1.3 µs |
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