PIC12C672-04/SM Microchip Technology, PIC12C672-04/SM Datasheet - Page 448
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PIC12C672-04/SM
Manufacturer Part Number
PIC12C672-04/SM
Description
IC MCU OTP 2KX14 A/D 8-SOIJ
Manufacturer
Microchip Technology
Series
PIC® 12Cr
Datasheets
1.PIC16F688T-ISL.pdf
(688 pages)
2.PIC12CE673-10P.pdf
(129 pages)
3.PIC12CE673-10P.pdf
(14 pages)
Specifications of PIC12C672-04/SM
Core Size
8-Bit
Program Memory Size
3.5KB (2K x 14)
Core Processor
PIC
Speed
4MHz
Peripherals
POR, WDT
Number Of I /o
5
Program Memory Type
OTP
Ram Size
128 x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Data Converters
A/D 4x8b
Oscillator Type
Internal
Operating Temperature
0°C ~ 70°C
Package / Case
8-SOIC (5.3mm Width), 8-SOP, 8-SOEIAJ
Controller Family/series
PIC12
No. Of I/o's
6
Ram Memory Size
128Byte
Cpu Speed
4MHz
No. Of Timers
1
Digital Ic Case Style
SOIC
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
XLT08SO-1 - SOCKET TRANSITION 8SOIC 150/208AC164312 - MODULE SKT FOR PM3 16SOICISPICR1 - ADAPTER IN-CIRCUIT PROGRAMMING309-1048 - ADAPTER 8-SOIC TO 8-DIP309-1047 - ADAPTER 8-SOIC TO 8-DIPAC124001 - MODULE SKT PROMATEII 8DIP/SOIC
Eeprom Size
-
Connectivity
-
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC12C672-04/SM
Manufacturer:
MIC
Quantity:
141
Part Number:
PIC12C672-04/SM
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
- Current page: 448 of 688
- Download datasheet (3Mb)
PICmicro MID-RANGE MCU FAMILY
24.3
DS31024A-page 24-6
Conversion Process
There are two methods for performing a conversion. To determine the end of conversion, the first
method uses the ADTMR overflow interrupt (OVFIF bit). The second method uses the A/D Cap-
ture Interrupt (ADCIF bit). At the end of conversion both bits are used to determine if an over-
range condition has occurred.
Method 1 uses a fixed conversion time, this means that the capacitor voltage always ramps to
the full scale voltage. Immediately after the overflow of the ADTMR, we recommend that the
ADRST bit is set to discharge the external capacitor. This will ensure that the residual voltage on
the external capacitor, due to dielectric absorption, is independent of input voltage or previous
conversions.
Method 2 uses a variable conversion time, which results in faster conversions for lower input volt-
ages.
Steps for Method 1 (“fixed conversion time”):
1.
2.
3.
4.
5.
6.
7.
8.
9.
10. Do Conversion Calculations
11. Goto Step 2
Initialize the Slope A/D module:
Set the ADRST bit (ADCON0<1>), until the ramp capacitor reaches ground. This is capac-
itor dependent. A minimum of 200 s is recommended.
Select Input Channel
Clear the OVFIF and ADCIF bits.
Initialize Slope A/D Timer (ADTMR). ADTMR value depends on bits of resolution required
(see
To start a conversion, clear the ADRST bit, this allows the ramp capacitor to begin charg-
ing and the ADTMR to increment.
Conversion is complete when the Slope A/D timer (ADTMR) overflows from FFFFh to
0000h. This causes the OVFIF bit to be set.
Check if the ADCIF bit is set. If this bit is set, the value in the capture register ADCAP is
valid. This method depends on minimum latency to verify the capture interrupt flag bit after
the ADTMR overflows. If the ADCIF bit is cleared, then the input voltage was out of the
A/D input range.
Set the ADRST bit (ADCON0<1>) to stop ADTMR and discharge external capacitor
a)Clear the REFOFF bit (SLPCON<5>)
b)Clear the ADOFF bit (SLPCON<0>)
c)Initialize ADCON1<7:4> to select the programmable current source.
Table
24-1).
1997 Microchip Technology Inc.
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