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MCP3462T-E/ST Datasheet(PDF) 53 Page - Microchip Technology |
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MCP3462T-E/ST Datasheet(HTML) 53 Page - Microchip Technology |
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53 / 108 page  2019-2021 Microchip Technology Inc. DS20006180D-page 53 MCP3461/2/4 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, regardless of what the CONV_MODE[1:0] bits are set to. Each conversion takes the same time, TCONV (or 2 x TCONV when AZ_MUX = 1, see Section 5.1.3 “ADC Offset Cancellation Algo- rithm”), 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 each cycle. 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 a data 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’ Depend in g on CONV_MOD E Writ e CONV_MODE = 0x/10 SPI Writ e A DC_MODE = 11 MCLK 00 ADC_MODE IRQ TADC_SET UP TCONV Read A DC Data 1 TDLY_SCAN 11 Continuous Clocking Don’t Care TDRH Sh u td o wn or R e set Depend in g on CONV_MOD E Sh u td o wn ADC STATUS Res et Channel 1 Conversi on Sta rt-u p TCONV Res et Channel 2 Conversi on TDLY_SCAN Channel N Co nv ers ion (L ast i n C ycl e) TCONV Read A DC Data N -1 Read A DC Data N TDRH Writ e CONV_MODE = 11 SPI Writ e A DC_MODE = 11 MCLK 00 ADC_MODE IRQ TADC_SE TUP TCONV Read A DC Data 1 TDLY_SCAN 11 Continuous Clocking Don’t Care TDRH Shutdown or Reset de pe nd i ng on TIMER [2 3:0] se tti n gs Sh u td o wn ADC STATUS Res et Channel 1 Conversi on Sta rt-u p TCONV Res et Channel 2 Conversi on TDLY_SCAN Channel N Co nv ers ion (L ast i n C ycl e) TCONV Read A DC Data N -1 Read A DC Data N TDRH Sta rt-u p Res et Channel 1 Conversi on (N ew C ycle ) TADC_SET UP TDRH Channel 2 Conversi on (N ew C ycle ) TDRH Read ADC Data1 (New Cycle) TCONV TCONV TDLY_SCAN TTIME R_SCAN Start-up Time is Reduced to 0 if TTIMER_SCAN < 256 DMCLK Periods |
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