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TSC2003IPWR 数据表(PDF) 6 Page - Texas Instruments |
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TSC2003IPWR 数据表(HTML) 6 Page - Texas Instruments |
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6 / 30 page  TSC2003 6 SBAS162G www.ti.com POWER-ON SEQUENCE TIMING POWER-ON SEQUENCE TIMING DIAGRAM During TSC2003 power-up, the I2C bus should be idle. In other words, the SDA and SCL lines must be high before the TSC supply (+VDD) ramps up greater than 0.9V. If the TSC uses the same supply as the the I2C bus pull-up resistors (VI2C), then a 1µF capacitor placed very close to the TSC supply pin will cause the TSC supply to ramp up more slowly (refer to the Power-On Sequence timing diagram). If the TSC supply (+VDD) is different than the supply to the I2C bus pull- up resistors (VI2C), then VI2C should be turned on before the TSC supply (+VDD) is powered up. TSC Supply +VDD 100% V DD ~ 0.9V t 1 ≥ 0 0V ~ 0.9V 0V ~ 0.9V 0V SCL SDA SCL High SDA Low I2C Bus Activity I2C Bus Activity 100% V I2C 100% V I2C |
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