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MCP9844 Datasheet(PDF) 4 Page - Microchip Technology |
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MCP9844 Datasheet(HTML) 4 Page - Microchip Technology |
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4 / 44 page  MCP9844 DS20005192A-page 4 2013 Microchip Technology Inc. TIMING DIAGRAM SERIAL INTERFACE TIMING SPECIFICATIONS Electrical Specifications: Unless otherwise indicated, GND = Ground, TA = -40°C to +125°C, and CL = 80 pF Note 1 . VDD= 1.7V to 3.6V VDD= 2.2V to 3.6V 100 kHz 400 kHz 1000 kHz Parameters Sym Min Max Min Max Min Max Units 2-Wire I2C™ Interface Serial port frequency (Note 2, 4)fSCL 10 100 10 400 10 1000 kHz Low Clock (Note 2)tLOW 4700 — 1300 — 500 — ns High Clock tHIGH 4000 — 600 — 260 — ns Rise time (Note 5)tR — 1000 20 300 — 120 ns Fall time (Note 5)tF 20 300 20 300 — 120 ns Data in Setup time (Note 3)tSU:DAT 250 — 100 —50 — ns Data in Hold time (Note 6)tHD:DI 0— 0 —0 — ns Data out Hold time (Note 4)tHD:DO 200 900 200 900 0 350 ns Start Condition Setup time tSU:STA 4700 — 600 — 260 — ns Start Condition Hold time tHD:STA 4000 — 600 — 260 — ns Stop Condition Setup time tSU:STO 4000 — 600 — 260 — ns Bus Idle/Free tB-FREE 4700 — 1300 — 500 — ns Time out tOUT 25 35 25 35 25 35 ms Bus Capacitive load Cb —— — 400 — 100 pf Note 1: All values referred to VIL MAX and VIH MIN levels. 2: If tLOW > tOUT, the temperature sensor I2C™ interface will time out. A Repeat Start command is required for communication. 3: This device can be used in a Standard mode I2C-bus system, but the requirement tSU:DAT 250 ns must be met. This device does not stretch SCL Low period. It outputs the next data bit to the SDA line within tR MAX + tSU:DAT MIN = 1000 ns + 250 ns = 1250 ns (according to the Standard-mode I 2C-bus specification) before the SCL line is released. 4: As a transmitter, the device provides internal minimum delay time tHD:DAT MIN to bridge the undefined region (min. 200 ns) of the falling edge of SCL tF MAX to avoid unintended generation of Start or Stop conditions. 5: Characterized but not production tested. 6: As a receiver, SDA should not be sampled at the falling edge of SCL. SDA can transition tHD:DI 0 ns after SCL toggles Low. Start Condition Data Transmission Stop Condition |
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