PIC16F707-E/P Microchip Technology, PIC16F707-E/P Datasheet - Page 86

• Manufacturer Part Number: PIC16F707-E/P
• Description: 14KB Flash Program, MTouch, 32ch CSM, 1.8V-5.5V, 16MHz Internal Oscillator, 8b A
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 16Fr

Specifications of PIC16F707-E/P

• 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: 36
• Program Memory Size: 14KB (8K x 14)
• Program Memory Type: FLASH
• Ram Size: 363 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 14x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• Processor Series: PIC16F
• Core: PIC
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

PIC16F707/PIC16LF707
9.3
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 9-3. 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 9-1:
DS41418A-page 86
The value for T
Solving for T
Therefore:
Note 1: The reference voltage (V
Assumptions:
Figure 9-3.
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
ACQ
T
) 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
2µs
4.42µs
–
–
–
1.12
–
–
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
+







+
1
T
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

) has no effect on the equation, since it cancels itself out.
COFF

50°C- 25°C
=
SS
+
+
HOLD
DD
V
10k
CHOLD
R
), refer


S
1
+
 ln(1/511)
) is not discharged after each conversion.

Preliminary
SS
SS
–
Hold Capacitor Charging Time

)
)
 0.05µs/°C
--------------------------

ln(0.001957)

2
n
+
 0.05µs/°C
1
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 9-1 may be
used. This equation assumes that 1/2 LSb error is used
(256 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]



CHOLD
CHOLD
5.0V V
+
charged to within 1/2 lsb
charge response to V
DD
Temperature Coefficient
 2010 Microchip Technology Inc.
APPLIED