PIC16C781T-I/SO Microchip Technology, PIC16C781T-I/SO Datasheet - Page 86

• Manufacturer Part Number: PIC16C781T-I/SO
• Description: IC MCU CMOS 8BIT 1K 20MHZ 20SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16C781T-I/SO

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 13
• Program Memory Size: 1.75KB (1K x 14)
• Program Memory Type: OTP
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x8b; D/A 1x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-SOIC (7.5mm Width)
• For Use With: AC164028 - MODULE SKT PROMATEII 20SOIC/DIP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Connectivity: -
• Other names: PIC16C781TI/SO

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