PIC16C782 Microchip Technology Inc., PIC16C782 Datasheet - Page 86
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PIC16C782
Manufacturer Part Number
PIC16C782
Description
8-bit Cmos Microcontrollers With A/d, D/a, Opamp, Comparators And Psmc
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC16C782.pdf
(186 pages)
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PIC16C781/782
REGISTER 11-1:
11.1.2
The Automatic Calibration Module (ACM) is an internal
state machine which performs an input offset voltage
calibration (trim) on the OPA module (see Figure 11-2).
Calibration is initiated by setting the CAL bit
(CALCON<7>). Upon completion of the calibration
sequence, the ACM will clear the CAL bit.
If a problem arises in the calibration process, the
CALERR flag (CALCON<6>) will be set to indicate the
failure to calibrate.
Setting CALREF (CALCON<5>) forces calibration at a
common mode voltage specified by the output of the
DAC module. The DAC module must be enabled prior
to calibration. Clearing CALREF will perform the cali-
bration with a common mode voltage of 1.2V. The out-
put pin floats during calibration.
DS41171A-page 84
bit 7
bit 6
bit 5-1
bit 0
CALCON REGISTER
OPAMP CONTROL REGISTER (OPACON: 11Ch)
OPAON: OPAMP Enable bit
1 = OPAMP is enabled
0 = OPAMP is disabled
CMPEN: Comparator Mode Enable bit
1 = Comparator mode
0 = OPAMP mode
Unimplemented: Read as ’0’
GBWP: Gain Bandwidth Product Select bits
1 = 2 MHz typ. (fast mode)
0 = 70 kHz typ. (slow mode)
Legend:
R = Readable bit
- n = Value at POR
bit 7
OPAON
R/W-0
CMPEN
R/W-0
Preliminary
U-0
W = Writable bit
’1’ = Bit is set
—
U-0
—
Note 1: Auto Calibration must be performed while
2: If the internal 1.2V reference is used for
3: The OPA module shares pins with the
4: When using the DAC as a reference for
U = Unimplemented bit, read as ‘0’
’0’ = Bit is cleared
U-0
the module is configured as an OPAMP
(CMPEN = 0). Performing Auto Calibra-
tion function in the Comparator mode
may yield unpredictable results.
the common mode voltage during Auto
Calibration, CALREF = 0 (CALCON<5>),
a delay for reference stabilization must be
observed before start of calibration.
ADC module. Performing ADC conver-
sions on the OPA+ or OPA- pins may
affect OPAMP stability.
calibration, CALREF = 1 (CALCON<5>),
the V
ified common mode voltage for the
OPAMP.
—
DAC
voltage must be within the spec-
U-0
—
2001 Microchip Technology Inc.
x = Bit is unknown
U-0
—
GBWP
R/W-0
bit 0
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