전자부품 데이터시트 검색엔진 |
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HCPL-8100 데이터시트(PDF) 10 Page - Agilent(Hewlett-Packard) |
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HCPL-8100 데이터시트(HTML) 10 Page - Agilent(Hewlett-Packard) |
10 / 11 page Table 2. Status pin logic Normal VCC < 4 V Over-Temperature ITx-out < − 0.25 A Status output Low High High High (pulsed) Although the series coupling impedance is minimized to reduce insertion loss, it has to be sufficiently large to limit the peak current to the desired level in the worst expected powerline load condition. The peak output current is effectively limited by the total series coupling resistance, which is made up of the series resistance of L2, the series resistance of the fuse and any other resistive element connected in the coupling network. To reduce power dissipation when not operating in transmit mode the line driver stage is shut down to a low power high impedance state by pulling the Tx-en input (pin 2) to logic low state. External Transient Voltage Protection To protect the HCPL-8100 and HCPL-0810 from high voltage transients caused by power surges and disconnecting/ connecting the modem, it is necessary to add an external 6.8 V bi-directional transient voltage protector (as component D1 shown in Figure 17). Additional protection from powerline voltage surges can be achieved by adding an appropriate Metal Oxide Varistor (MOV) across the powerline terminals after the fuse. Internal Protection and Sensing The HCPL-8100 and HCPL- 0810 include several sensing and protection functions to ensure robust operation under wide ranging environmental conditions. The first feature is the VCC Under Voltage Detection (UVD). In the event of VCC dropping to a voltage less than 4 V, the output status pin is switched to a logic high state. The next feature is the over- temperature shutdown. This particular feature protects the line driver stage from over- temperature stress. Should the IC junction temperature reach a level above 150°C, the line driver circuit will be shut down and the output of Status (pin 1) is pulled to the logic high state simultaneously. The final feature is load detection function. The powerline impedance is quite unpredictable and varies not just at different connection points but is also time variant. The HCPL-8100 and HCPL- 0810 include a current sense feature, which may be utilized to feedback information on the instantaneous powerline load condition. Should the peak current reach a level greater than 0.5 APP, the output of status pin is pulled to a logic high state for the entire period the peak current exceeds -0.25 A as shown in Figure 12. Using the period of the pulse together with the known coupling impedance, the actual powerline load can be calculated. Table 2 shows the logic output of the Status pin. |
유사한 부품 번호 - HCPL-8100 |
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유사한 설명 - HCPL-8100 |
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