PIC16F84AT-04/SS Microchip Technology, PIC16F84AT-04/SS Datasheet - Page 428
![IC MCU FLASH 1KX14 EE 20SSOP](/photos/6/58/65895/150-20-ssop_sml.jpg)
PIC16F84AT-04/SS
Manufacturer Part Number
PIC16F84AT-04/SS
Description
IC MCU FLASH 1KX14 EE 20SSOP
Manufacturer
Microchip Technology
Series
PIC® 16Fr
Datasheets
1.PIC16F688T-ISL.pdf
(688 pages)
2.PIC16F84A-04P.pdf
(88 pages)
3.PIC16F84A-04P.pdf
(6 pages)
Specifications of PIC16F84AT-04/SS
Core Processor
PIC
Core Size
8-Bit
Speed
4MHz
Peripherals
POR, WDT
Number Of I /o
13
Program Memory Size
1.75KB (1K x 14)
Program Memory Type
FLASH
Eeprom Size
64 x 8
Ram Size
68 x 8
Voltage - Supply (vcc/vdd)
4 V ~ 5.5 V
Oscillator Type
External
Operating Temperature
0°C ~ 70°C
Package / Case
20-SSOP
For Use With
XLT20SS1-1 - SOCKET TRANSITION 20DIP 20SSOPI3-DB16F84A - BOARD DAUGHTER ICEPIC3
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Data Converters
-
Connectivity
-
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PICmicro MID-RANGE MCU FAMILY
23.4
DS31023A-page 23-6
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 . As the impedance is decreased, the acquisition time may be
decreased. After the analog input channel is selected (changed) this acquisition must be done
before the conversion can be started.
To calculate the minimum acquisition time,
that 1/2 LSb error is used (1024 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 23-1:
Equation 23-2:
Example 23-1
This calculation is based on the following application system assumptions.
C
Rs
Conversion Error
V
Temperature
V
Example 23-1:
T
T
Temperature coefficient is only required for temperatures > 25 C.
T
T
T
DD
HOLD
HOLD
V
or
Tc
ACQ
ACQ
ACQ
C
ACQ
HOLD
=
=
23-3. The source impedance (R
=
=
=
=
Amplifier Settling Time +
Holding Capacitor Charging Time +
Temperature Coefficient
T
=
=
T
2 s + Tc + [(Temp - 25 C)(0.05 s/ C)]
-C
-120 pF (1 k + 7 k + 10 k ) ln(0.0004885)
-120 pF (18 k ) ln(0.0004885)
-2.16 s (-7.6241)
16.47 s
2 s + 16.47 s + [(50 C - 25 C)(0.05 s/ C)]
18.47 s + 1.25 s
19.72 s
shows the calculation of the minimum required acquisition time T
AMP
AMP
HOLD
Acquisition Time
A/D Minimum Charging Time
(V
-(120 pF)(1 k + R
Calculating the Minimum Required Acquisition Time (Case 1)
+ T
+ T
REF
(R
=
=
=
=
=
C
C
- (V
IC
+ T
+ T
+ R
Preliminary
120 pF
10 k
1/2 LSb
5V
50 C (system max.)
0V @ time = 0
REF
COFF
COFF
SS
/2048)) • (1 - e
+ R
Rss = 7 k
SS
S
DD
) ln(1/2047)
S
+ R
),
) and the internal sampling switch (R
Equation 23-1
Figure
S
) ln(1/2047)
(-Tc/C
23-3. The maximum recommended imped-
(see graph in
HOLD
HOLD
may be used. This equation assumes
(R
IC
. The sampling switch (R
+ R
SS
Figure
1997 Microchip Technology Inc.
+ R
S
))
)
23-3)
ACQ
SS
) impedance
.
HOLD
SS
) imped-
) must
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