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MC145028DW bảng dữ liệu(PDF) 11 Page - Freescale Semiconductor, Inc |
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MC145028DW bảng dữ liệu(HTML) 11 Page - Freescale Semiconductor, Inc |
11 / 20 page Pin Descriptions MC145026, MC145027, MC145028 Technical Data, Rev. 4 Freescale Semiconductor 11 R1, C1 Resistor 1, Capacitor 1 (Pins 6, 7) As shown in Figure 3 and Figure 4, these pins accept a resistor and capacitor that are used to determine whether a narrow pulse or wide pulse has been received. The time constant R1 × C1 should be set to 1.72 encoder clock periods: R1 C1 = 3.95 RTC CTC R2/C2 Resistor 2/Capacitor 2 (Pin 10) As shown in Figure 3 and Figure 4, this pin accepts a resistor and capacitor that are used to detect both the end of a received word and the end of a transmission. The time constant R2 x C2 should be 33.5 encoder clock periods (four data periods per Figure 12): R2 C2 = 77 RTC CTC. This time constant is used to determine whether the Din pin has remained low for four data periods (end of transmission). A separate on-chip comparator looks at the voltage-equivalent two data periods (0.4 R2 C2) to detect the dead time between received words within a transmission. VT Valid Transmission Output (Pin 11) This valid transmission output goes high after the second word of an encoding sequence when the following conditions are satisfied: 1. the received addresses of both words match the local decoder address, and 2. the received data bits of both words match. VT remains high until either a mismatch is received or no input signal is received for four data periods. VSS Negative Power Supply (Pin 8) The most-negative supply potential. This pin is usually ground. VDD Positive Power Supply (Pin 16) The most-positive power supply pin. |
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Mô tả tương tự - MC145028DW |
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