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參數(shù)資料
| 型號： | ADS8507I |
| 英文描述： | 16-BIT 40-KSPS LOW POWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH INTERNAL REFERENCE AND PARALLEL/SERIAL INTERFACE |
| 中文描述： | 16位40 kSPS的低功耗采樣模擬到數(shù)字轉(zhuǎn)換的內(nèi)部基準(zhǔn)，并行/串行接口 |
| 文件頁數(shù)： | 28/32頁 |
| 文件大小： | 738K |
| 代理商： | ADS8507I |
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R/C
BUSY
SDATA
DATACLK
CS
EXT/INT
BYTE
PCS0/SS
MOSI
SCK
QSPI
ADS8507
Convert Pulse
CPOL = 0 (Inactive State is LOW)
CPHA = 1 (Data Valid on Falling Edge)
QSPI Port is in Slave Mode.
R/C
D7 (MSB)
DATACLK
CS
BYTE
PCS0
PCS1
SCK
QSPI
ADS8507
CPOL = 0
CPHA = 0
+ 5 V
EXT/INT
MISO
ADS8507
SLAS381–DECEMBER 2006
APPLICATION INFORMATION (continued)
Figure 49. QSPI Interface to the ADS8507
Before enabling the QSPI interface, the microcontroller must be configured to monitor the slave select line.
When a transition from low to high occurs on slave select (SS) from BUSY (indicating the end of the current
conversion), the port can be enabled. If this is not done, the microcontroller and the A/D converter may be
out-of-sync
.
Figure 50
shows another interface between the ADS8507 and a QSPI equipped microcontroller which allows the
microcontroller to give the convert pulses while also allowing multiple peripherals to be connected to the serial
bus. This interface and the following discussion assume a master clock for the QSPI interface of 16.78 MHz.
Notice that the serial data input of the microcontroller is tied to the MSB (D7) of the ADS8507 instead of the
serial output (SDATA). Using D7 instead of the serial port offers 3-state capability which allows other peripherals
to be connected to the MISO pin. When communication is desired with those peripherals, PCS0 and PCS1
should be left high; that keeps D7 3-stated.
Figure 50. QSPI Interface to the ADS8507, Processor Initiates Conversions
In this configuration, the QSPI interface is actually set to do two different serial transfers. The first, an 8-bit
transfer, causes PCS0 (R/C) and PCS1 (CS) to go low, starting a conversion. The second, a 16-bit transfer,
causes only PCS1 (CS) to go low. This is when the valid data is transferred.
For both transfers, the DT register (delay after transfer) is used to cause a 19-μs delay. The interface is also set
up to wrap to the beginning of the queue. In this manner, the QSPI is a state machine which generates the
appropriate timing for the ADS8507. This timing is thus locked to the crystal-based timing of the microcontroller
and not interrupt driven. So, this interface is appropriate for both AC and DC measurements.
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相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADS8507IB | 16-BIT 40-KSPS LOW POWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH INTERNAL REFERENCE AND PARALLEL/SERIAL INTERFACE |
| ADS8507IBDW | 16-BIT 40-KSPS LOW POWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH INTERNAL REFERENCE AND PARALLEL/SERIAL INTERFACE |
| ADS8507IBDWG4 | 16-BIT 40-KSPS LOW POWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH INTERNAL REFERENCE AND PARALLEL/SERIAL INTERFACE |
| ADS8507IBDWR | 16-BIT 40-KSPS LOW POWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH INTERNAL REFERENCE AND PARALLEL/SERIAL INTERFACE |
| ADS8507IBDWRG4 | 16-BIT 40-KSPS LOW POWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH INTERNAL REFERENCE AND PARALLEL/SERIAL INTERFACE |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS8507IB | 制造商:BB 制造商全稱:BB 功能描述:16-BIT 40-KSPS LOW POWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH INTERNAL REFERENCE AND PARALLEL/SERIAL INTERFACE |
| ADS8507IBDW | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 40KSPS 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 |
| ADS8507IBDWG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 40KSPS 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 |
| ADS8507IBDWR | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 40KSPS 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 |
| ADS8507IBDWRG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 40KSPS 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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