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MCP98243 数据表(PDF) 5 Page - Microchip Technology |
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MCP98243 数据表(HTML) 5 Page - Microchip Technology |
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5 / 62 page  © 2009 Microchip Technology Inc. DS22153C-page 5 MCP9843/98243 SENSOR AND EEPROM SERIAL INTERFACE TIMING SPECIFICATIONS Electrical Specifications: Unless otherwise indicated, GND = Ground, TA = -20°C to +125°C, and CL = 80 pF (Note 1, 5). VDD= 1.8V to 5.5V VDD= 2.2V to 5.5V Parameters Sym Min Max Min Max Units Conditions 2-Wire I2C Interface Serial port frequency fSCL 10 100 10 400 kHz Note 2, 4 Low Clock tLOW 4700 — 1300 —ns Note 2 High Clock tHIGH 4000 — 600 —ns Note 2 Rise time tR — 1000 20 300 ns Fall time tF 20 300 20 300 ns Data in Setup time tSU:DI 250 — 100 —ns Note 3 Data in Hold time tHD:DI 0— 0 —ns Note 6 Data out Hold time tHD:DO 200 900 200 900 ns Note 4 Start Condition Setup time tSU:STA 4700 — 600 —ns Start Condition Hold time tHD:STA 4000 — 600 —ns Stop Condition Setup time tSU:STO 4000 — 600 —ns Bus idle tB:FREE 4700 — 1300 —ns Time out (Sensor Only) tOUT —— 25 35 ms VDD= 3.0V to 3.6V Bus Capacitive load Cb —— — 400 pf Note 1: All values referred to VIL MAX and VIH MIN levels. 2: If tLOW > tOUT or tHIGH > 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 time. It outputs the next data bit to the SDA line within tRMAX + tSU:DI MIN = 1000 ns + 250 ns = 1250 ns (according to the Standard-mode I2C-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. 300 ns) of the falling edge of SCL tF MAX to avoid unintended generation of Start or Stop conditions. 5: For VDD ranges of 1.8V to the temperature sensor VPOR_TS, the temperature sensor becomes partially biased and consumes 100 µA (typical) until the sensor POR resets and acknowledges a shutdown com- mand. 6: As a receiver, SDA should not be sampled at the falling edge of SCL. SDA can transition tHD:DI 0ns after SCL toggles Low. |
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