PIC12CE674-10I/P Microchip Technology, PIC12CE674-10I/P Datasheet - Page 390
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PIC12CE674-10I/P
Manufacturer Part Number
PIC12CE674-10I/P
Description
IC MCU OTP 2KX14 A/D&EE 8DIP
Manufacturer
Microchip Technology
Series
PIC® 12Cr
Datasheets
1.PIC16F688T-ISL.pdf
(688 pages)
2.PIC12CE673-10P.pdf
(129 pages)
3.PIC12CE673-10P.pdf
(3 pages)
4.PIC12CE673-10P.pdf
(14 pages)
5.PIC12CE673-10P.pdf
(12 pages)
Specifications of PIC12CE674-10I/P
Core Processor
PIC
Core Size
8-Bit
Speed
10MHz
Peripherals
POR, WDT
Number Of I /o
5
Program Memory Size
3.5KB (2K x 14)
Program Memory Type
OTP
Eeprom Size
16 x 8
Ram Size
128 x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Data Converters
A/D 4x8b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
8-DIP (0.300", 7.62mm)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Connectivity
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC12CE674-10I/P
Manufacturer:
MICROCHIP
Quantity:
12 000
- PIC16F688T-ISL PDF datasheet
- PIC12CE673-10P PDF datasheet #2
- PIC12CE673-10P PDF datasheet #3
- PIC12CE673-10P PDF datasheet #4
- PIC12CE673-10P PDF datasheet #5
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PICmicro MID-RANGE MCU FAMILY
21.4
DS31021A-page 21-6
A/D Acquisition Requirements
For the A/D converter to meet its specified accuracy, the charge holding capacitor ( C
be allowed to fully charge to the input channel voltage level. The analog input model is shown in
Figure
directly affect the time required to charge the capacitor C
ance varies over the device voltage (V
ance for analog sources is 10 k . After the analog input channel is selected (changed) the
acquisition must be done before the conversion can be started.
To calculate the minimum acquisition time,
that 1/2 LSb error is used (512 steps for the A/D). The 1/2 LSb error is the maximum error allowed
for the A/D to meet its specified resolution.
Equation 21-1:
Equation 21-2:
Example 21-1
lation is based on the following system assumptions.
Rs
Conversion Error
V
Temperature
V
Example 21-1:
T
V
or
Tc
T
T
T
T
DD
HOLD
ACQ
ACQ
ACQ
C
ACQ
HOLD
=
21-3. The source impedance ( R
=
=
=
=
=
=
=
Amplifier Settling Time +
Holding Capacitor Charging Time +
Temperature Coefficient
T
T
5 s + Tc + [(Temp - 25 C)(0.05 s/ C)]
-C
-51.2 pF (1 k + 7 k + 10 k ) ln(0.0020)
-51.2 pF (18 k ) ln(0.0020)
-0.921 s (-6.2146)
5.724 s
5 s + 5.724 s + [(50 C - 25 C)(0.05 s/ C)]
10.724 s + 1.25 s
11.974 s
(V
-(51.2 pF)(1 k + R
shows the calculation of the minimum required acquisition time T
AMP
AMP
HOLD
REF
Acquisition Time
A/D Minimum Charging Time
Calculating the Minimum Required Acquisition Time
+ T
+ T
- (V
(R
=
=
=
=
C
C
IC
REF
+ T
+ T
+ R
/512)) • (1 - e
COFF
COFF
10 k
1/2 LSb
5V
50 C (system max.)
0V @ time = 0
SS
+ R
SS
Rss = 7 k
+ R
DD
S
) ln(1/512)
S
)
) and the internal sampling switch ( R
S
(Figure
) ln(1/511)
(-Tc/C
Equation 21-1
HOLD
21-3). The maximum recommended imped-
(R
IC
HOLD
(see graph in
+ R
may be used. This equation assumes
SS
. The sampling switch ( R
+ R
S
))
1997 Microchip Technology Inc.
)
Figure
21-3)
ACQ
SS
) impedance
. This calcu-
HOLD
SS
) imped-
) must
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