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MCP3562-E/ST 数据表(PDF) 53 Page - Microchip Technology |
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MCP3562-E/ST 数据表(HTML) 53 Page - Microchip Technology |
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53 / 108 page  2019-2021 Microchip Technology Inc. DS20006181C-page 53 MCP3561/2/4 5.13.2 CONVERSION MODES IN SCAN MODE In SCAN mode, the device takes one conversion per channel and multiplexes the input to the next channel in the SCAN sequence. Therefore, all conversions are One-Shot mode conversions, no matter how the CONV_MODE[1:0] bits are set. Each conversion takes the same time, TCONV (or 2 x TCONV when AZ_MUX = 1, see Section 5.1.3 “ADC Offset Cancellation Algorithm”), to be performed. If CONV_MODE[1:0] = 00, 01 or 10, the scan cycle is executed once and then the ADC is placed into Standby or ADC Shutdown mode. If CONV_MODE[1:0] = 11, the ADC runs in a SCAN Cycle mode with a TIMER[23:0] delay between cycles. Writing the CONV_MODE[1:0] bits with the SPI inter- face within a conversion does not create an internal Reset. It is recommended not to wait for the end of a conversion to change the CONV_MODE[1:0] bits to the desired value, but to change to the desired value just after the data are ready to avoid possible glitches. Figure 5-15 and Figure 5-16, respectively, detail the ADC timing behavior in One-Shot and Continuous Conversion modes when configured for SCAN mode with N channels chosen among 16 SCAN possibilities. FIGURE 5-15: SCAN One-Shot Conversion Mode Timing Diagram. FIGURE 5-16: SCAN Continuous Conversion Mode Timing Diagram. ‘ 0x’ or ‘10’ Depending on CONV_MODE Write CONV_MODE = 0x/10 SPI Write ADC_MODE = 11 MCLK 00 ADC_MODE IRQ TADC_SETUP TCONV Read ADC Data 1 TDLY_SCAN 11 Continuous Clocking Don’t Care TDRH ADC Shutdown or Reset Depending on CONV_MODE ADC Shutdown ADC STATUS Reset Channel 1 Conversion Start-up TCONV Reset Channel 2 Conversion TDLY_SCAN Channel N Conversion (Last in Cycle) TCONV Read ADC Data N-1 Read ADC Data N TDRH Write CONV_MODE = 11 SPI Write ADC_MODE = 11 MCLK 00 ADC_MODE IRQ TADC_SETUP TCONV Read ADC Data 1 TDLY_SCAN 11 Continuous Clocking Don’t Care TDRH ADC Shutdown or Reset Depending on TIMER[23:0] Settings ADC Shutdown ADC STATUS Reset Channel 1 Conversion Start-up TCONV Reset Channel 2 Conversion TDLY_SCAN Channel N Conversion (Last in Cycle) TCONV Read ADC Data N-1 Read ADC Data N TDRH Start-up Reset Channel 1 Conversion (New Cycle) TADC_SETUP TDRH Channel 2 Conversion (New Cycle) TDRH Read ADC Data1 (New Cycle) TCONV TCONV TDLY_SCAN TTIMER_SCAN Start-up Time is Reduced to 0 if TTIMER_SCAN < 256 DMCLK Periods |
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