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EM341 数据表(PDF) 13 Page - Silicon Laboratories |
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EM341 数据表(HTML) 13 Page - Silicon Laboratories |
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13 / 237 page  EM341 Rev 1.0 13 2.5. Digital I/O Specifications Table 2.5 lists the digital I/O specifications for the EM341. The digital I/O power (named VDD_PADS) comes from three dedicated pins (pins 23, 28 and 37). The voltage applied to these pins sets the I/O voltage. Table 2.5. Digital I/O Specifications Parameter Test Condition Min Typ Max Unit Voltage supply (regulator input voltage) 2.1 — 3.6 V Low Schmitt switching threshold VSWIL Schmitt input threshold going from high to low 0.42 x VDD_PADS — 0.50 x VDD_PADS V High Schmitt switching threshold VSWIH Schmitt input threshold going from low to high 0.62 x VDD_PADS — 0.80 x VDD_PADS V Input current for logic 0 IIL — — –0.5 μA Input current for logic 1 IIH — — +0.5 μA Input pull-up resistor value RIPU 24 29 34 k Input pull-down resistor value RIPD 24 29 34 k Output voltage for logic 0 VOL (IOL = 4 mA for standard pads, 8 mA for high current pads) 0 — 0.18 x VDD_PADS V Output voltage for logic 1 VOH (IOH = 4 mA for standard pads, 8 mA for high current pads) 0.82 x VDD_PADS — VDD_PADS V Output source current (standard current pad) IOHS — — 4 mA Output sink current (standard current pad) IOLS — — 4 mA Output source current high current pad: PA6, PA7, PB6, PB7, PC0 IOHH — — 8 mA Output sink current high current pad: PA6, PA7, PB6, PB7, PC0 IOLH — — 8 mA Total output current (for I/O Pads) IOH + IOL — — 40 mA |
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