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ET1200 bảng dữ liệu(PDF) 33 Page - Beckhoff Automation GmbH & Co. KG |
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ET1200 bảng dữ liệu(HTML) 33 Page - Beckhoff Automation GmbH & Co. KG |
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33 / 70 page  Pin Description Slave Controller – ET1200 Hardware Description III-23 3.9 Power Supply The ET1200 supports different power supply and I/O voltage options with 3.3V (or 5V I/O, not recommended) and optionally single or dual power supply. The VCCI/O supply voltage directly determines the I/O voltages for all inputs and outputs, i.e., with 3.3V VCCI/O, the inputs are 3.3V I/O compliant and they are not 5V tolerant (VCCI/O has to be 5V if 5V tolerant I/Os are required). Two internal LDOs generate the I/O supply voltage VCC I/O (nom. 3.3V) and the core supply voltages VCC Core/VCC PLL (nom. 2.5V) from the ET1200 power supply input VCC. VCC must be equal or greater than VCC I/O, and VCC PLL is always equal to VCC Core. The internal LDOs cannot be switched off, they stop operating if the external supply voltage is higher than the internal LDO output voltage, thus external supply voltages have to be higher (at least 0.1V) than the internal LDO output voltages. Using the internal LDOs increases power dissipation, and power consumption for 5V I/O voltage is significantly higher than power consumption for 3.3V I/O. It is highly recommended to use 3.3V I/O voltage and the internal LDO for VCC Core/VCC PLL. For 3.3V I/O with external 3.3V power supply, both VCC and VCCI/O have to be connected to the external 3.3V supply voltage, and for 5V I/O voltage, both VCC and VCCI/O have to be connected to the external 5V supply voltage. Voltage stabilization capacitors at all power pairs are necessary. Table 29: Power supply options (all voltages nomal) VCC VCC I/O VCC Core/VCC PLL Input signals Output signals Comment 3.3V External 3.3V (= VCC) Internal LDO (2.5V) 3.3V only 3.3V only Single power supply, low power dissipation 3.3V External 3.3V (= VCC) External 2.5V 3.3V only 3.3V only Dual power supply, lowest power dissipation 5V Internal LDO (3.3V) Internal LDO (2.5V) 3.3V only 3.3V only Single power supply, highest power dissipation 5V Internal LDO (3.3V) External 2.5V 3.3V only 3.3V only Dual power supply Not recommended: 5V External 5V (= VCC) Internal LDO (2.5V) 5V only 5V only Single power supply, high power dissipation 5V External 5V (= VCC) External 2.5V 5V only 5V only Dual power supply, high power dissipation Table 30: Power supply Pin Pin name EP GND 14 VCC 15 GND 6 VCC I/O 7 GNDI/O 41 VCC Core (2.5V) 42 GNDCore 24 VCC PLL (2.5V) 23 GNDPLL |
Số phần tương tự - ET1200 |
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Mô tả tương tự - ET1200 |
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