PIC16F1934-E/ML Microchip Technology, PIC16F1934-E/ML Datasheet - Page 142

• Manufacturer Part Number: PIC16F1934-E/ML
• Description: IC PIC MCU FLASH 256KX7 44-QFN
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 16Fr

Specifications of PIC16F1934-E/ML

• Program Memory Type: FLASH
• Program Memory Size: 7KB (4K x 14)
• Package / Case: 44-QFN
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 32MHz
• Connectivity: I²C, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 36
• Eeprom Size: 256 x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 14x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: EUSART/MI2C/SPI
• Maximum Clock Frequency: 32 MHz
• Number Of Programmable I/os: 36
• Number Of Timers: 5
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 14-ch x 10-bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

PIC16F193X/LF193X
11.3
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 11-4. 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 kΩ. As the
EQUATION 11-1:
DS41364A-page 140
The value for T
Solving for T
Therefore:
Note 1: The reference voltage (V
Assumptions:
Figure 11-4.
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 kΩ. This is required to meet the pin
A/D Acquisition Requirements
AP P LI ED
AP P LI ED
AP P LI ED
T
leakage specification.
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
2
ACQUISITION TIME EXAMPLE
4.42
–
–
–
1.12
–
–
ΜS
Amplifier Settling Time
T
2µs
C
10pF 1k
--------------------------
(
maximum
AMP
) must be allowed to fully
2
–
--------- -
–
-------- -
HOLD
RC
+
RC
ΜS
µs
T
Tc
n
+
C
1.12
+
⎞
⎟
⎠
⎞
⎟
⎠
(
+
1
T
1
(
C
) 1
=
R
=
T
ΜS
Ω
+
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
Ω
50°C- 25°C
=
SS
+
+
HOLD
DD
V
10k
CHOLD
R
), refer
⎛
⎝
S
1
+
) ln(1/511)
) is not discharged after each conversion.
Ω
Preliminary
SS
SS
–
Hold Capacitor Charging Time
)
)
)
) 0.05
--------------------------
(
ln(0.001957)
(
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 11-1 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]
)
]
Ω
CHOLD
CHOLD
5.0V V
+
charged to within 1/2 lsb
charge response to V
DD
Temperature Coefficient
© 2008 Microchip Technology Inc.
APPLIED