PIC16LF1827-E/ML Microchip Technology, PIC16LF1827-E/ML Datasheet - Page 149
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PIC16LF1827-E/ML
Manufacturer Part Number
PIC16LF1827-E/ML
Description
18 Pin, 7 KB Flash, 384 Bytes RAM, 32 MHz Int. Osc, 16 I/0, Enhanced Mid Range C
Manufacturer
Microchip Technology
Series
PIC® XLP™ 16Fr
Specifications of PIC16LF1827-E/ML
Core Processor
PIC
Core Size
8-Bit
Speed
32MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
16
Program Memory Size
7KB (4K x 14)
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
384 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
28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
Processor Series
PIC16LF
Core
PIC
3rd Party Development Tools
52715-96, 52716-328, 52717-734
Development Tools By Supplier
PG164130, DV164035, DV244005, DV164005
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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15.3
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 15-4. The source
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 15-1:
2010 Microchip Technology Inc.
The value for T
Solving for T
Assumptions:
Therefore:
Note 1: The reference voltage (V
Figure 15-4.
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
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
+
C
+
1.12µs
+
T
1
1
C
1
=
R
=
T
+
–
IC
C
=
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)
Preliminary
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, Equation 15-1 may be
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.
–
PIC16F/LF1826/27
;[1] V
;[2] V
;combining [1] and [2]
CHOLD
CHOLD
5.0V V
+
charged to within 1/2 lsb
charge response to V
DD
Temperature Coefficient
DS41391C-page 149
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