PIC16F684-E/P Microchip Technology, PIC16F684-E/P Datasheet - Page 65

• Manufacturer Part Number: PIC16F684-E/P
• Description: IC PIC MCU FLASH 2KX14 14DIP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F684-E/P

• Program Memory Type: FLASH
• Program Memory Size: 3.5KB (2K x 14)
• Package / Case: 14-DIP (0.300", 7.62mm)
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 12
• Eeprom Size: 256 x 8
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 128 B
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 12
• Number Of Timers: 3
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: Through Hole
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, DM163014, DM164120-4
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8-ch x 10-bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: DM163029 - BOARD PICDEM FOR MECHATRONICSACICE0207 - MPLABICE 14P 300 MIL ADAPTER
• Connectivity: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

9.0
The Analog-to-Digital converter (A/D) allows conver-
sion of an analog input signal to a 10-bit binary repre-
sentation of that signal. The PIC16F684 has eight
analog inputs, multiplexed into one sample and hold
FIGURE 9-1:
9.1
There are three registers available to control the
functionality of the A/D module:
1.
2.
3.
9.1.1
The ANS<7:0> bits (ANSEL<7:0>) and the TRIS bits
control the operation of the A/D port pins. Set the
corresponding TRIS bits to set the pin output driver to
its high-impedance state. Likewise, set the correspond-
ing ANSEL bit to disable the digital input buffer.
9.1.2
There are eight analog channels on the PIC16F684,
AN0
(ADCON0<4:2>) control which channel is connected to
the sample and hold circuit.
 2004 Microchip Technology Inc.
Note:
ANSEL (Register 9-1)
ADCON0 (Register 9-2)
ADCON1 (Register 9-3)
through
ANALOG-TO-DIGITAL
CONVERTER (A/D) MODULE
A/D Configuration and Operation
ANALOG PORT PINS
Analog voltages on any pin that is defined
as a digital input may cause the input
buffer to conduct excess current.
CHANNEL SELECTION
RA1/AN1/V
AN7.
A/D BLOCK DIAGRAM
RC0/AN4
RC1/AN5
RC2/AN6
RC3/AN7
RA4/AN3
RA0/AN0
RA2/AN2
REF
The
CHS<2:0>
CHS<2:0>
V
REF
Preliminary
bits
V
DD
GO/DONE
VCFG = 0
VCFG = 1
ADON
circuit. The output of the sample and hold is connected
to the input of the converter. The converter generates a
binary result via successive approximation and stores
the result in a 10-bit register. The voltage reference
used in the conversion is software selectable to either
V
shows the block diagram of the A/D on the PIC16F684.
9.1.3
There are two options for the voltage reference to the
A/D converter: either V
applied to V
controls the voltage reference selection. If VCFG is set,
then the voltage on the V
otherwise, V
V
DD
SS
or a voltage applied by the V
A/D
ADFM
VOLTAGE REFERENCE
REF
DD
is the reference.
is used. The VCFG bit (ADCON0<6>)
ADRESH ADRESL
DD
is used, or an analog voltage
PIC16F684
10
10
REF
pin is the reference;
REF
DS41202C-page 63
pin. Figure 9-1