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SX8725S Datasheet(PDF) 48 Page - Semtech Corporation |
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SX8725S Datasheet(HTML) 48 Page - Semtech Corporation |
48 / 69 page www.semtech.com Page 48 ADVANCED COMMUNICATIONS & SENSING DATASHEET SX8725S ZoomingADC for sensing data acquisition Revision 1.0 February 2011 © Semtech 10.2.5 Mode Registers (1) The chop control is to allow chopping of the internal bandgap reference. This may be useful to help eliminate bandgap related internal offset voltage and 1/f noise. The bandgap chop state may be forced High or Low, or may be set to toggle during conversion at either the same rate or half the rate of the Elementary Conversion. (See Conversion Sequence in the ZoomingADC description). (2) The internal charge pump may be forced On when VBATT supply is below 3V or Off when VBATT supply is above 3V. Enabling the charge pump increase the current consumption. If the ADC is not being run at full rate or full accuracy then it may operate sufficiently well when VBATT is less than 3V and internal charge pump forced Off. Table 34. RegMode[0x70] Bit Name Mode Reset Description 7 - r1 reserved 6 - r0 reserved 5:4 Chopper rw 00 VREF chopping control. Note 1 11 : Chop at NELCONV/2 rate 10 : Chop at NELCONV rate 01 : Chop state=1 00 : Chop state=0 3 MultForceOn rw 0 Force charge pump On. Takes priority. Note 2 2 MultForceOff rw 1 Force charge pump Off. Note 2 1 VrefD0Out rw 0 Enable VREF output on D0 pin 0 VrefD1In rw 0 Enable external VREF on D1 pin |
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