PIC16F1827-E/P Microchip Technology Inc., PIC16F1827-E/P Datasheet - Page 149
![no-image](/images/manufacturer_photos/0/4/440/microchip_technology_inc__sml.jpg)
PIC16F1827-E/P
Manufacturer Part Number
PIC16F1827-E/P
Description
7 KB Flash, 384 bytes RAM, 32 MHz Int. Osc, 16 I/0, Enhanced Mid Range Core
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC16F1826-ISO.pdf
(406 pages)
Specifications of PIC16F1827-E/P
A/d Inputs
12-Channel, 10-Bit
Comparators
2
Cpu Speed
8 MIPS
Eeprom Memory
256 Bytes
Input Output
16
Interface
CAN/I2C/SPI/UART/USART
Memory Type
Flash
Number Of Bits
8
Package Type
18-pin PDIP
Programmable Memory
7K Bytes
Ram Size
384 Bytes
Speed
32 MHz
Timers
4-8-bit, 1-16-bit
Voltage, Range
1.8-5.5 V
Standby Current (pic16lf182x)
30 nA @ 1.8 V, Typical
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16.4
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
impedance (R
impedance directly affect the time required to charge
the capacitor C
impedance varies over the device voltage (V
to
impedance for analog sources is 10 k. As the
EQUATION 16-1:
2011 Microchip Technology Inc.
The value for T
Solving for T
Assumptions:
Therefore:
Note 1: The reference voltage (V
Figure
V
V
V
Note: Where n = number of bits of the ADC.
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
AP P LI ED
AP P LI ED
AP P LI ED
16-4.
leakage specification.
T
S
T
A CQ
) and the internal sampling switch (R
C
ACQ
T
:
HOLD
C
C
The
Temperature
can be approximated with the following equations:
=
=
=
=
1
1 e
1 e
=
HOLD
=
=
=
. The sampling switch (R
ACQUISITION TIME EXAMPLE
–
–
–
1.12
4.42µs
–
–
2µs
Amplifier Settling Time
T
2µs
C
10pF 1k
--------------------------
maximum
AMP
) must be allowed to fully
2
–
--------- -
–
-------- -
HOLD
RC
RC
µs
T
Tc
+
n
Figure
+
C
+
1.12µs
+
T
1
1
C
1
=
R
=
T
+
–
IC
C
16-4. The source
=
V
V
+
+
REF
+
+
A PP LIE D
CHOLD
recommended
7k
50°C and external impedance of 10k
Temperature - 25°C
T
R
COFF
) has no effect on the equation, since it cancels itself out.
=
SS
50°C- 25°C
+
+
HOLD
DD
V
10k
R
CHOLD
), refer
S
+
1
) is not discharged after each conversion.
ln(1/511)
SS
SS
–
Hold Capacitor Charging Time
)
)
--------------------------
ln(0.001957)
2
0.05
n
+
0.05µs/°C
1
µs/°C
1
1
source impedance is decreased, the acquisition time
may be decreased. After the analog input channel is
selected (or changed), an A/D acquisition must be
done before the conversion can be started. To calculate
the minimum acquisition time,
used. This equation assumes that 1/2 LSb error is used
(1,024 steps for the ADC). The 1/2 LSb error is the
maximum error allowed for the ADC to meet its
specified resolution.
–
;[1] V
;[2] V
;combining [1] and [2]
PIC16(L)F1826/27
CHOLD
CHOLD
5.0V V
+
charged to within 1/2 lsb
charge response to V
DD
Temperature Coefficient
Equation 16-1
DS41391D-page 149
APPLIED
may be
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