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4 / 13 page www.sensirion.com Version 1 – May 2014 3/13 4 Timing Specifications 4.1 Sensor System Timings Default conditions of 25 °C and 1.8 V supply voltage apply to values the table below, unless otherwise stated. Max. values are measured at -30°C and 1.98V supply voltage. Parameter Symbol Conditions Min. Typ. Max. Units Comments Power-up time tPU After hard reset, VDD ≥ VPOR - 182 239 µs Time between VDD reaching VPU and sensor entering idle state Soft reset time tSR After soft reset. - 173 230 µs Time between ACK of soft reset command and sensor entering idle state Measurement duration tMEAS - - 10.8 14.4 ms Duration for a temperature measurement8 Table 4 System timing specifications. 4.2 Communication Timings Default conditions of 25 °C and 1.8 V supply voltage apply to values in the table below, unless otherwise stated. Parameter Symbol Conditions Min. Typ. Max. Units Comments SCL clock frequency fSCL - 0 - 400 kHz - Hold time (repeated) START condition tHD;STA After this period, the first clock pulse is generated 0.6 - - µs - LOW period of the SCL clock tLOW - 1.3 - - µs - HIGH period of the SCL clock tHIGH - 0.6 - - µs - Set-up time for a repeated START condition tSU;STA - 0.6 - - µs - SDA hold time tHD;DAT - 0 - - - - SDA set-up time tSU;DAT - 100 - - ns - SCL/SDA rise time tR - 20 - 300 ns - SCL/SDA fall time tF - 20 * (VDD/5.5) - 300 ns - SDA valid time tVD;DAT - - - 0.9 µs - Set-up time for STOP condition tSU;STO - 0.6 - - µs - Capacitive load on bus line CB - - - 400 pF - Table 5 Communication timing specifications. The numbers above are values according to the I2C specification. 8 These values can be reduced by using the low power measurement mode, see separate application note. |
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