datasheet (3).pdf - EEWeb

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dsPIC33FJ32MC302/304, dsPIC33FJ64MCX02/X04 AND dsPIC33FJ128MCX02/X04 24.1 Comparator Voltage Reference 24.1.1 CONFIGURING THE COMPARATOR VOLTAGE REFERENCE The voltage reference module is controlled through the CVRCON register (Register 24-2). The comparator voltage reference provides two ranges of output voltage, each with 16 distinct levels. The range to be used is selected by the CVRR bit (CVRCON). The primary difference between the ranges is the size of the steps selected by the CVREF Selection bits (CVR3:CVR0), with one range offering finer resolution. The comparator reference supply voltage can come from either VDD and VSS, or the external VREF+ and VREF-. The voltage source is selected by the CVRSS bit (CVRCON). The settling time of the comparator voltage reference must be considered when changing the CVREF output. FIGURE 24-2: COMPARATOR VOLTAGE REFERENCE BLOCK DIAGRAM VREF+ AVDD CVREN CVRR VREF- AVSS CVRSS = 1 CVRSS = 0 16 Steps CVRSS = 1 CVRSS = 0 CVRSRC 8R R R R R R R R 8R CVRCON CVR3 CVR2 CVR1 CVR0 DS70291E-page 296 © 2011 Microchip Technology Inc. 16-to-1 MUX CVROE (CVRCON) CVREFIN CVREF
dsPIC33FJ32MC302/304, dsPIC33FJ64MCX02/X04 AND dsPIC33FJ128MCX02/X04 REGISTER 24-2: CVRCON: COMPARATOR VOLTAGE REFERENCE CONTROL REGISTER U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0 — — — — — — — — bit 15 bit 8 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 CVREN CVROE CVRR CVRSS CVR bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown bit 15-8 Unimplemented: Read as ‘0’ bit 7 CVREN: Comparator Voltage Reference Enable bit 1 = CVREF circuit powered on 0 = CVREF circuit powered down bit 6 CVROE: Comparator VREF Output Enable bit 1 = CVREF voltage level is output on CVREF pin 0 = CVREF voltage level is disconnected from CVREF pin bit 5 CVRR: Comparator VREF Range Selection bit 1 = CVRSRC range should be 0 to 0.625 CVRSRC with CVRSRC/24 step size 0 = CVRSRC range should be 0.25 to 0.719 CVRSRC with CVRSRC/32 step size bit 4 CVRSS: Comparator VREF Source Selection bit 1 = Comparator reference source CVRSRC = VREF+ – VREF- 0 = Comparator reference source CVRSRC = AVDD – AVSS bit 3-0 CVR: Comparator VREF Value Selection 0 ≤ CVR ≤ 15 bits When CVRR = 1: CVREF = (CVR/ 24) • (CVRSRC) When CVRR = 0: CVREF = 1/4 • (CVRSRC) + (CVR/32) • (CVRSRC) © 2011 Microchip Technology Inc. DS70291E-page 297
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