PIC18LF14K22-E/SO Microchip Technology, PIC18LF14K22-E/SO Datasheet - Page 217
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PIC18LF14K22-E/SO
Manufacturer Part Number
PIC18LF14K22-E/SO
Description
16KB Flash, 512bytes RAM, 256bytes EEPROM, 16MIPS, NanoWatt XLP 20 SOIC .300in T
Manufacturer
Microchip Technology
Series
PIC® XLP™ 18Fr
Datasheet
1.PIC18LF13K22-ISS.pdf
(388 pages)
Specifications of PIC18LF14K22-E/SO
Core Processor
PIC
Core Size
8-Bit
Speed
48MHz
Connectivity
I²C, LIN, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
17
Program Memory Size
16KB (8K x 16)
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 3.6 V
Data Converters
A/D 12x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Package / Case
20-SOIC (7.5mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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16.3
For the ADC to meet its specified accuracy, the charge
holding capacitor (C
charge to the input channel voltage level. The Analog
Input model is shown in Figure 16-5. The source
impedance (R
impedance directly affect the time required to charge the
capacitor C
varies over the device voltage (V
The maximum recommended impedance for analog
sources is 10 k. As the source impedance is
decreased, the acquisition time may be decreased.
After the analog input channel is selected (or changed),
EQUATION 16-1:
2010 Microchip Technology Inc.
Note 1: The reference voltage (V
The value for T
Solving for T
Therefore:
Assumptions:
2: The charge holding capacitor (C
3: The maximum recommended impedance for analog sources is 10 k. This is required to meet the pin
A/D Acquisition Requirements
HOLD
leakage specification.
T
V
S
V
V
ACQ
T
) and the internal sampling switch (R
AP PLIE D
T
. The sampling switch (R
AP P LI ED
ACQ
AP P LIED
C
C
=
=
=
=
=
:
C
HOLD
=
=
=
–
ACQUISITION TIME EXAMPLE
5µs
Temperature
–
7.45µs
can be approximated with the following equations:
1.20
13.5pF 1k
C
Amplifier Settling Time
T
5µs
1
) must be allowed to fully
AMP
HOLD
1 e
1 e
+
µs
–
–
+
–
1.20µs
----------- -
2047
+
T
1
–
--------- -
R
–
-------- -
C
DD
RC
RC
T
T
Tc
IC
+
C
C
), see Figure 16-5.
+
+
+
+
REF
=
T
Temperature - 25°C
=
=
=
R
700
SS
COFF
) has no effect on the equation, since it cancels itself out.
SS
50°C- 25°C
) impedance
50°C and external impedance of 10k
V
V
V
+
CHOLD
CHOLD
A P PLIE D
HOLD
+
R
S
10k
ln(1/2047)
+
) is discharged after each conversion.
Preliminary
SS
Hold Capacitor Charging Time
)
0.05µs/°C
1
ln(0.0004885)
PIC18F1XK22/LF1XK22
–
0.05µs/°C
----------- -
2047
1
an A/D acquisition must be done before the conversion
can be started. To calculate the minimum acquisition
time, Equation 16-1 may be used. This equation
assumes that 1/2 LSb error is used (1024 steps for the
ADC). The 1/2 LSb error is the maximum error allowed
for the ADC to meet its specified resolution.
;[2] V
;combining [1] and [2]
;[1] V
CHOLD
CHOLD
3.0V V
+
charged to within 1/2 lsb
charge response to V
Temperature Coefficient
DD
DS41365D-page 217
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