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參數(shù)資料
| 型號： | TLC2543-EVM |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | TLC2543 Evaluation Module(TLC2543評估板) |
| 中文描述： | 器TLC2543評估模塊（器TLC2543評估板） |
| 文件頁數(shù)： | 21/52頁 |
| 文件大?。?/td> | 231K |
| 代理商： | TLC2543-EVM |
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Microcontroller
2-7
Overview
2.2
Microcontroller and Interface
This section provides an overview and describes the operation of the micro-
controller and interface function.
2.2.1
Overview
The TLC2543EVM uses a TI TMS370C712 microcontroller to interface with
the TLC2543 ADC. The program reads the four-position INPUT SELECT DIP
switch to determine which input is selected to be digitized. The program then
uses the serial peripheral interface (SPI) to communicate with the TLC2543.
Sixteen bits of data (12 significant bits and 4 fill bits) are read into the processor
and output on the three LED displays approximately every 0.5 second.
A fast mode can also be selected with the INPUT SELECT switch. In this
mode, channel four is selected as input and 20 samples are taken at about a
30-kHz rate, data is converted and displayed, and the process is repeated until
another input is selected with the switch. A power-down mode, which places
the TLC2543 in a power-down mode and blanks the display, can also be
selected.
2.2.2
Operation
The TMS370C712 microcontroller (U4) samples the status of the INPUT
SELECT switch on ports A4–A7. This sample data, which is sent to the
TLC2543 ADC through the SPI ports (SPICLK, SPISIM0, and SPISOMI)
determines the specific multiplexer input that is converted. The microcontroller
then reads back the converted 12 bits and decodes the data into hexadecimal
three-digit values. The hexadecimal data is transferred to the three hexa-
ecimal displays, U7, U8, and U9. Five sections of the 74HC244 octal buffer
are used to drive the common-bused TTL inputs of the displays.
For all INPUT SELECT positions except Fh, the microcontroller instructs the
TLC2543 ADC to perform the analog-to-digital conversions and display the
results at a rate of approximately 2 conversions per second. When the INPUT
SELECT position is Fh, the microcontroller selects input IN4 and the conver-
sions from the ADC are at a rate of approximately 30-k conversions per second
(see section 2.1.3.2, Fast Conversion Rate).
Notes:
The following information applies to the TMS370C712 SPI protocol to the
TLC2543.
The TLC2543 strobes in the command data bits from the microcontroller on
the DIN port at the rising edge of the clock pulse on the I/O CLK terminal. The
TMS370C712 generates a clock rising edge on the SPICLK port, and at that
time while conforming to the SPI interface requirements, the data output on
the SPISIM0 port changes to reflect the next serial bit to be transferred.
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| TLC2543IDB | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12Bit 66kSPS Ser Out Prog MSB/LSB First RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| TLC2543IDBG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12Bit 66kSPS Ser Out Prog MSB/LSB First RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| TLC2543IDBR | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12Bit 66kSPS Ser Out Prog MSB/LSB First RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| TLC2543IDBRG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12Bit 66kSPS Ser Out Prog MSB/LSB First RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| TLC2543IDBRG4Q1 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12B 66kSPS ADC Ser. Out RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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