PIC16F1939-I/PT Microchip Technology Inc., PIC16F1939-I/PT Datasheet - Page 165

• Manufacturer Part Number: PIC16F1939-I/PT
• Description: 44 TQFP 10x10x1mm TRAY, 28KB Flash, 1KB RAM, 256B EEPROM, LCD, 1.8-5.5V
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F1939-I/PT

• A/d Inputs: 14-Channel, 10-Bit
• Comparators: 2
• Cpu Speed: 8 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 36
• Interface: I2C/SPI/UART/USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 40-pin TQFP
• Programmable Memory: 28K Bytes
• Ram Size: 1K Bytes
• Speed: 32 MHz
• Temperature Range: –40 to 125 °C
• Timers: 4-8-bit, 1-16-bit
• Voltage, Range: 1.8-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

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:
 2009 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
AC Q
) 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
2µs
4.42µs
–
–
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)
 0.05

2
n
+
 0.05µs/°C
1
ΜS
1

 1
/°C
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.
–
PIC16F193X/LF193X




;[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
DS41364D-page 165
APPLIED