PIC12F683-I/SN Microchip Technology Inc., PIC12F683-I/SN Datasheet - Page 69

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PIC12F683-I/SN

Manufacturer Part Number
PIC12F683-I/SN
Description
8 PIN, 3.5 KB FLASH, 128 RAM, 6 I/O
Manufacturer
Microchip Technology Inc.
Datasheet

Specifications of PIC12F683-I/SN

A/d Inputs
4-Channel, 10-Bit
Comparators
1
Cpu Speed
5 MIPS
Eeprom Memory
256 Bytes
Input Output
5
Memory Type
Flash
Number Of Bits
8
Package Type
8-pin SOIC-N
Programmable Memory
3.5K Bytes
Ram Size
128 Bytes
Speed
20 MHz
Timers
2-8-bit, 1-16-bit
Voltage, Range
2-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part Electrostatic Device

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0
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 k . As the source impedance is
decreased, the acquisition time may be decreased.
After the analog input channel is selected (or changed),
EQUATION 9-1:
© 2006 Microchip Technology Inc.
Note 1: The reference voltage (V
Assumptions:
The value for T
Solving for T
Therefore:
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
HOLD
leakage specification.
T
V
S
V
V
ACQ
T
) and the internal sampling switch (R
AP PLIE D
T
. The sampling switch (R
ACQ
AP P LI ED
AP P LIED
C
C
=
=
=
=
=
:
HOLD
C
=
=
=
ACQUISITION TIME EXAMPLE
Temperature
4.67µ
can be approximated with the following equations:
1.37
C
10pF 1k
Amplifier Settling Time
T
2µs
S
1
) must be allowed to fully
AMP
HOLD
1 e
1 e
+
µs
S
+
1.37µ
----------- -
2047
+
T
R
1
--------- -
C
-------- -
RC
RC
T
T
DD
Tc
IC
+
C
C
S
+
), see Figure 9-4.
+
+
+
REF
7k
=
Temperature - 25°C 0.05µs/°C
T
=
=
=
R
SS
) has no effect on the equation, since it cancels itself out.
COFF
SS
50°C- 25°C 0.05µ
) impedance
50°C and external impedance of 10k
V
V
V
+
+
CHOLD
A P PLIE D
HOLD
CHOLD
10k
R
S
+
) is not discharged after each conversion.
ln(1/2047)
SS
Hold Capacitor Charging Time
ln(0.0004885)
)
1
----------- -
2047
S
1
/°C
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.
;[2] V
;combining [1] and [2]
;[1] V
CHOLD
CHOLD
5.0V V
+
charged to within 1/2 lsb
charge response to V
Temperature Coefficient
DD
PIC12F683
DS41211C-page 67
APPLIED

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