參數(shù)資料
型號(hào)： ADS8517IDW
廠商： TEXAS INSTRUMENTS INC
元件分類： ADC
英文描述： 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL/PARALLEL ACCESS, PDSO28
封裝： GREEN, PLASTIC, SOIC-28
文件頁數(shù)： 24/38頁
文件大?。?/td> 948K
代理商： ADS8517IDW
ADS8517 AS AN SPI SLAVE DEVICE (INT/EXT TIED HIGH)
Microcontroller
SPIMaster
CPOL=0(inactiveSCLKisLOW)
CPHA=1(datavalidonSCLKfallingedge)
NOTE:
ADS8517
SPISlave
TOUT
INT
MOSI
SCLK
R/C
BUSY
SDATA
DATACLK
CS
EXT/INT
V
S
BYTE
8-BIT SPI INTERFACE
SLAS527A – SEPTEMBER 2008 – REVISED JUNE 2009 ................................................................................................................................................. www.ti.com
Figure 45 shows another interface between the ADS8517 and an SPI-equipped microcontroller or DSP in which
the host processor acts as an SPI master device.
Figure 45. ADS8517 as SPI Slave
In this configuration, the data transfer from the ADS8517 is triggered by the rising edge of the serial data clock
provided by the SPI master. The SPI interface should be configured to read valid SDATA on the falling edge of
SCLK. When a minimum of 17 SCLKs are provided to the ADS8517, data can be strobed to the host processor
on the rising SCLK edge providing a 2ns (min) hold time (see td8 in Table 6).
When using an external interrupt to facilitate serial data transfers, as shown in Figure 45, there are two options
for the configuration of the interrupt service routine (ISR): falling-edge-triggered or rising-edge-triggered.
A falling-edge-triggered transfer would initiate an SPI transfer after the falling edge of BUSY, providing the host
controller with the previous conversion results, while the current conversion cycle is underway. The timing for this
type of interface is described in detail in Figure 36. Care must be taken to ensure the entire 16-bit conversion
result is retrieved from the ADS8517 before BUSY returns high to avoid the potential corruption of the current
conversion cycle.
A rising-edge-triggered transfer is the preferred method of obtaining the conversion results. This timing is
depicted in Figure 35. This method of obtaining data ensures that SCLK is static during the conversion cycle and
provides the host processor with current cycle conversion results.
For microcontrollers that only support 8-bit SPI transfers, it is recommended to configure the ADS8517 for SPI
slave operation, as depicted in Figure 45. With the microcontroller configured as the SPI master, two 8-bit
transfers are required to obtain full 16-bit conversion results from the ADS8517. The eight MSBs of the
conversion result are considered valid on the falling SCLK edges of the first transfer, with the remaining four
LSBs being valid on the first four falling SCLK edges in the second transfer.
30
Copyright 2008–2009, Texas Instruments Incorporated
Product Folder Link(s): ADS8517
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADS8517IDWG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16B,5V,125KSPS,ADC 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
ADS8517IDWR 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Low Power 16-Bit 200 kSPS ADC 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
ADS8517IDWRG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16B,5V,125KSPS,ADC 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
ADS8517IPW 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Lo Pwr 16B 200kSPS +/-10V Bip InSAR ADC 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
ADS8517IPWR 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Lo Pwr 16B 200kSPS +/-10V Bip InSAR ADC 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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