Datenblatt-Suchmaschine für elektronische Bauteile |
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CDB5461 Datenblatt(PDF) 7 Page - Cirrus Logic |
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CDB5461 Datenblatt(HTML) 7 Page - Cirrus Logic |
7 / 27 page CDB5461 7 OPEN position for normal operation. When testing the RS-232 link in the PC software, close S1-3. The S1-2 switch selects the crystal source for the 8051. There are two crystal op- tions available, 11.059 MHz and 20 MHz. If S1-2 is OPEN the 11.059 MHz crystal is se- lected, and when S1-2 is CLOSED the 20 MHz crystal is selected. If S1-1 is closed, the CS5461 operates in auto- boot mode. When in auto-boot mode, a hard- ware reset (press on S2) will cause the CS5461 to boot up using the serial data from the serial EEPROM on the board (U9). The EEPROM must be programmed prior to the auto-boot sequence. The EEPROM does come pre-programmed with a valid boot-up sequence. This sequence programs the CS5461 for continuous conversion mode. If voltage and current signals are applied to the inputs, the CS5461 will issue pulses on the /EOUT and /EDIR pins. The J24 header must be shorted for auto-boot to work. When the CDB5461 Evaluation Board is sent from the factory, the EEPROM is programmed with the following CS5461 command/data se- quence: 40 00 00 61 ;In configuration Register, turn high- pass filters on, set K = 1. 4C 10 00 00 ;Set Pulse Rate Register to 32768 Hz. E8 ;Start continuous conversions. 78 00 01 00 ;Write stop bit to CS5461 to termi- nate autoboot sequence . The auto-boot sequence runs with no assis- tance from the 8051 microcontroller. The user can verify this by disconnecting power from the board, pulling the microcontroller out of its socket, then power on again and run in auto- boot mode. See the CS5461 data sheet for more details on auto-boot. 2. SOFTWARE The evaluation board comes with software and RS-232 cable to link the evaluation board to the PC. The evaluation software was devel- oped with Lab Windows®/CVI®, a software de- velopment package from National Instruments. The software was designed to run under Windows®95 or later, and requires about 3MB of hard drive space (2MB for the CVI® Run-Time Engine, and 1MB for the eval- uation software). After installing the software, read the readme.txt file for any last minute up- dates or changes. More sophisticated analysis software can be developed by purchasing the LabWindows® development package from Na- tional Instruments. 8051 Mode S1 8051 in Normal Operating Mode S1-1 OPEN S1-2 CLOSED 20 MHz Crystal S1-3 OPEN 8051 in Normal Operation Mode S1-1 OPEN S1-2 OPEN 11.059 MHz Crystal S1-3 OPEN 8051 in Test Mode S1-1 OPEN S1-2 CLOSED 20 MHz Crystal S1-3 CLOSED 8051 in Test Mode S1-1 OPEN S1-2 OPEN 11.059 MHz Crystal S1-3 CLOSED Auto-Boot Mode S1-1 CLOSED S1-2 CLOSED S1-3 OPEN Table 4. DIP Switch S1 Setting 1 23 OPEN 1 23 OPEN 1 23 OPEN 1 23 OPEN 1 23 OPEN |
Ähnliche Teilenummer - CDB5461 |
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Ähnliche Beschreibung - CDB5461 |
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