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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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ADS1000A0IDBVR Arkusz danych(PDF) 9 Page - Texas Instruments |
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ADS1000A0IDBVR Arkusz danych(HTML) 9 Page - Texas Instruments |
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9 / 23 page  www.ti.com CONFIGURATION REGISTER READING FROM THE ADS1000 WRITING TO THE ADS1000 ADS1000 SBAS357A – SEPTEMBER 2006 – REVISED OCTOBER 2007 A user controls the ADS1000 operating mode and Bits 1 - 0: PGA PGA settings via the 8-bit configuration register. The Bits 1 and 0 control the ADS1000 gain setting; see configuration register format is shown in Table 3. The Table 4. default setting is 80H. Table 4. PGA Bits Table 3. CONFIGURATION REGISTER 7 6 5 4 3 2 1 0 PGA1 PGA0 GAIN 0(1) 0(1) 1(1) ST/BSY 0 0 SC 0 0 PGA1 PGA0 0 1 2 Bit 7: ST/BSY 1 0 4 1 1 8 The meaning of the ST/BSY bit depends on whether (1) Default setting. it is being written to or read from. In single conversion mode, writing a '1' to the ST/BSY bit causes a conversion to start, and writing a '0' has no effect. In continuous conversion mode, the ADS1000 ignores the value written to ST/BSY. A user can read the output register and the contents When read in single conversion mode, ST/BSY of the configuration register from the ADS1000. To do indicates whether the A/D converter is busy taking a this, address the ADS1000 for reading, and read conversion. If ST/BSY is read as '1', the A/D three bytes from the device. The first two bytes are converter is busy, and a conversion is taking place; if the output register contents; the third byte is the '0', no conversion is taking place, and the result of the configuration register contents. last conversion is available in the output register. A user does not always have to read three bytes from In continuous mode, ST/BSY is always read as '1'. the ADS1000. If only the contents of the output Bits 6 - 5: Reserved register are needed, read only two bytes. Bits 6 and 5 must be set to zero. Reading more than three bytes from the ADS1000 has no effect. All of the bytes beginning with the Bit 4: SC fourth byte will be FFh. See Figure 7 for a timing SC controls whether the ADS1000 is in continuous diagram of an ADS1000 read operation. conversion or single conversion mode. When SC is '1', the ADS1000 is in single conversion mode; when SC is '0', the ADS1000 is in continuous conversion A user can write new contents into the configuration mode. The default setting is '0'. register (the contents of the output register cannot Bits 3 - 2: Reserved change). To do this, address the ADS1000 for writing, and write one byte to it. This byte is written into the Bits 3 and 2 must be set to zero. configuration register. Writing more than one byte to the ADS1000 has no effect. The ADS1000 ignores any bytes sent to it after the first one, and will only acknowledge the first byte. See Figure 8 for a timing diagram of an ADS1000 write operation. Copyright © 2006–2007, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Link(s): ADS1000 |
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