PIC16F610-E/ML Microchip Technology, PIC16F610-E/ML Datasheet - Page 81

• Manufacturer Part Number: PIC16F610-E/ML
• Description: 1.75KB Flash, 64B RAM, 6 I/O, 8MHz Internal Oscillator 16 QFN 4x4mm TUBE
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F610-E/ML

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 11
• Program Memory Size: 1.75KB (1K x 14)
• Program Memory Type: FLASH
• Ram Size: 64 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 16-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: AC162083 - HEADER MPLAB ICD2 PIC16F616 8/14AC164324 - MODULE SKT FOR MPLAB 8DFN/16QFNXLT16QFN1 - SOCKET TRANSITION 14DIP TO 16QFN
• Eeprom Size: -
• Data Converters: -
• Connectivity: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

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 9-4. The source
impedance (R
impedance directly affect the time required to charge the
capacitor C
varies over the device voltage (V
The maximum recommended impedance for analog
sources is 10 kΩ. As the 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 (1024 steps for the
ADC). The 1/2 LSb error is the maximum error allowed
for the ADC to meet its specified resolution.
EQUATION 9-1:
© 2009 Microchip Technology Inc.
Note 1: The reference voltage (V
The value for T
Solving for T
Therefore:
Assumptions:
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
HOLD
leakage specification.
T
V
S
V
V
ACQ
T
) and the internal sampling switch (R
AP PLIE D
T
. The sampling switch (R
AP P LI ED
ACQ
AP P LIED
C
C
=
=
=
=
:
=
C
HOLD
=
=
=
ACQUISITION TIME EXAMPLE
5µs
Temperature
–
–
1.37
7.67µs
can be approximated with the following equations:
10pF 1k
⎛
⎝
C
Amplifier Settling Time
T
5µs
⎛
⎜
⎝
⎛
⎜
⎝
1
) must be allowed to fully
AMP
HOLD
1 e
1 e
+
µs
–
+
–
–
1.37µs
(
----------- -
2047
+
T
(
1
–
--------- -
R
C
–
-------- -
RC
RC
Ω
T
DD
T
Tc
IC
+
C
C
+
⎞
⎠
⎞
⎟
⎠
⎞
⎟
⎠
), see Figure 9-4.
+
+
+
[
REF
(
7k
=
Temperature - 25°C
T
=
=
[
=
R
SS
(
Ω
COFF
) has no effect on the equation, since it cancels itself out.
SS
50°C- 25°C
) impedance
50°C and external impedance of 10k
V
V
V
+
PIC16F610/616/16HV610/616
+
CHOLD
CHOLD
A P PLIE D
HOLD
10k
R
S
) ln(1/2047)
+
Ω
) is not discharged after each conversion.
SS
)
Hold Capacitor Charging Time
ln(0.0004885)
)
) 0.05µs/°C
⎛
⎝
(
1
–
) 0.05µs/°C
----------- -
2047
(
1
⎞
⎠
)
]
;[2] V
;combining [1] and [2]
;[1] V
)
]
CHOLD
CHOLD
Ω
5.0V V
+
charged to within 1/2 lsb
charge response to V
Temperature Coefficient
DD
DS41288F-page 81
APPLIED