PIC16F785-I/SO Microchip Technology, PIC16F785-I/SO Datasheet - Page 80

• Manufacturer Part Number: PIC16F785-I/SO
• Description: IC PIC MCU FLASH 2KX14 20SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F785-I/SO

• Program Memory Type: FLASH
• Program Memory Size: 3.5KB (2K x 14)
• Package / Case: 20-SOIC (7.5mm Width)
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 17
• Eeprom Size: 256 x 8
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 14x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 128 B
• Interface Type: RS- 232/USB
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 17
• Number Of Timers: 3
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, DV164120, DM163029
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 14-ch x 10-bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: XLT20SO1-1 - SOCKET TRANS ICE 20DIP TO 20SOICXLT18SO-1 - SOCKET TRANSITION 18SOIC 300MILAC162060 - HEADER INTRFC MPLAB ICD2 20PINAC164039 - MODULE SKT PROMATE II 20DIP/SOIC
• Connectivity: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PIC16F785
12.1
There are four registers available to control the
functionality of the A/D module:
1.
2.
3.
4.
12.1.1
The
ANSEL0<7:0>) and the TRISA<4,2:0>, TRISB<5:4>
and TRISC<7:6,3:0>> bits control the operation of the
A/D port pins. Set the corresponding TRISx bits to ‘1’ to
set the pin output driver to its high-impedance state.
Likewise, set the corresponding ANSx bit to disable the
digital input buffer.
12.1.2
There are fourteen analog channels on the PIC16F785.
The CHS<3:0> bits (ADCON0<5:2>) control which
channel is connected to the sample and hold circuit.
TABLE 12-1:
DS41249A-page 78
Legend: Shaded cells are outside of recommended range.
Note 1: The A/D RC source has a typical T
Note:
Operation
16 T
32 T
64 T
A/D RC
ANSEL0 (Register 12-1)
ANSEL1 (Register 12-2)
ADCON0 (Register 12-3)
ADCON1 (Register 12-4)
2 T
4 T
8 T
A/D Clock Source (T
2: These values violate the minimum required T
3: For faster conversion times, the selection of another clock source is recommended.
4: When the device frequency is greater than 1 MHz, the A/D RC clock source is only recommended if the
OSC
OSC
OSC
ANS<11:0>
OSC
OSC
OSC
A/D Configuration and Operation
conversion will be performed during Sleep.
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
ADCS2:ADCS0
T
AD
VS. DEVICE OPERATING FREQUENCIES
bits
000
100
001
101
010
110
x11
AD
)
(ANSEL1<3:0>
2–6 µs
100 ns
200 ns
400 ns
800 ns
20 MHz
1.6 µs
3.2 µs
AD
(1,4)
time of 4 µs for V
(2)
(2)
(2)
(2)
and
Preliminary
AD
time.
2–6 µs
12.8 µs
400 ns
800 ns
12.1.3
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
12.1.4
The A/D conversion cycle requires 11 T
of the conversion clock is software selectable via the
ADCS bits (ADCON1<6:4>). There are seven possible
clock options:
• F
• F
• F
• F
• F
• F
• F
For correct conversion, the A/D conversion clock
(1/T
1.6 µs. Table 12-1 shows a few T
selected frequencies.
5 MHz
1.6 µs
3.2 µs
6.4 µs
DD
OSC
OSC
OSC
OSC
OSC
OSC
RC
AD
Device Frequency
(1,4)
> 3.0V.
(2)
(2)
(3)
) must be selected to ensure a minimum T
(dedicated internal oscillator)
/2
/4
/8
/16
/32
/64
VOLTAGE REFERENCE
CONVERSION CLOCK
REF
DD
is the reference.
is used. The VCFG bit (ADCON0<6>)
2–6 µs
16.0 µs
500 ns
1.0 µs
8.0 µs
4 MHz
2.0 µs
4.0 µs
DD
 2004 Microchip Technology Inc.
(1,4)
is used or an analog voltage
(2)
(3)
(2)
(3)
REF
pin is the reference;
AD
calculations for
AD
2–6 µs
1.25 MHz
12.8 µs
25.6 µs
51.2 µs
1.6 µs
3.2 µs
6.4 µs
. The source
(1,4)
(3)
(3)
(3)
AD
of