PIC16F77-E/PT Microchip Technology, PIC16F77-E/PT Datasheet - Page 390
![IC MCU FLASH 8KX14 A/D 44TQFP](/photos/6/82/68251/c04-076_pt_sml.jpg)
PIC16F77-E/PT
Manufacturer Part Number
PIC16F77-E/PT
Description
IC MCU FLASH 8KX14 A/D 44TQFP
Manufacturer
Microchip Technology
Series
PIC® 16Fr
Datasheets
1.PIC16F616T-ISL.pdf
(8 pages)
2.PIC16F688T-ISL.pdf
(688 pages)
3.PIC16F818-ISO.pdf
(6 pages)
4.PIC16F73-ISP.pdf
(174 pages)
5.PIC16F73-ISP.pdf
(14 pages)
6.PIC16F73-ISP.pdf
(12 pages)
Specifications of PIC16F77-E/PT
Core Processor
PIC
Core Size
8-Bit
Speed
20MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
33
Program Memory Size
14KB (8K x 14)
Program Memory Type
FLASH
Ram Size
368 x 8
Voltage - Supply (vcc/vdd)
4 V ~ 5.5 V
Data Converters
A/D 8x8b
Oscillator Type
External
Operating Temperature
-40°C ~ 125°C
Package / Case
44-TQFP, 44-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Other names
PIC16F77E/PT
- PIC16F616T-ISL PDF datasheet
- PIC16F688T-ISL PDF datasheet #2
- PIC16F818-ISO PDF datasheet #3
- PIC16F73-ISP PDF datasheet #4
- PIC16F73-ISP PDF datasheet #5
- PIC16F73-ISP PDF datasheet #6
- Current page: 390 of 688
- Download datasheet (3Mb)
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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