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CDB8130 Datasheet(PDF) 6 Page - Cirrus Logic |
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CDB8130 Datasheet(HTML) 6 Page - Cirrus Logic |
6 / 10 page CDB8130 6 DS170DB5 Removing J35 will disconnect power from the lev- el translator. All the digital signals on the CS8130, FORM/BSY, D/C, TXD, RXD, EXTCLK, RESET, PWRDN, and CLKFR can be accessed directly from header J11. All digital input pins are tied to 47 k Ω pull-up resistors through resistor set R1. 1.6 Clock Selection The clock for the CS8130 can be supplied via a crystal tied between XTALIN and XTALOUT (the default configuration on the evaluation board) or by an external clock supplied through the EXT- CLK pin. To operate the CS8130 from an external clock source, cut the trace under J3 (XTAL), and the (XTAL) part of J4, then connect the center pin of J4 to the edge pin marked EXT. Note: the EXTCLK pin on the CS8130 can be ei- ther an input or an output. If the CS8130 is being clocked from a crystal, EXTCLK is an output. If no crystal is present, EXTCLK is an input. This de- termination of direction is made while RESET is asserted. The CS8130 can be operated from either a 3.6864 MHz or a 1.8432 MHz clock source. If operating from a 3.6864 MHz source, jumper J18 (CLKFR) must be installed. This brings the CLKFR pin on the CS8130 low. If operating from a 1.8432 MHz source, jumper J18 should be removed. 1.7 Power Down Jumper J14 (PWRDN) controls the state of the PWRDN pin on the CS8130. PWRDN is asserted when J14 is installed. 1.8 Status Indicator LEDs Key digital signals on the CS8130 are displayed on indicator LEDs U6 (U8) and U7 (U9), shown sche- matically in Figure 4. Because these LEDs are driven through inverters, the interpretation of what it means when a LED is lit can be confusing. Table 2 should help clarify this. 1.9 Software The CDB8130 evaluation kit comes equipped with software that can be used to evaluate and test the CS8130. Additional software is currently under development. See the documentation supplied with the CDB8130 evaluation kit for instructions on how to use the software. Software updates and new releases can be down- loaded from the Crystal BBS. Contact the factory for details. Name LED On means. . . LED1C Transmitter #1 active LED2C Transmitter #2 active PWRDN Power down asserted RESET Reset asserted RXD Data being received by the CS8130 TXD Data being transmitted to the CS8130 D/C CS8130 in Control Mode FORM/BSY Auto detect ASK/TV TX ready Table 2. LED Indicator Meanings |
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