PIC16F721T-I/ML Microchip Technology, PIC16F721T-I/ML Datasheet - Page 78

• Manufacturer Part Number: PIC16F721T-I/ML
• Description: 7 KB FLASH, 256 B SRAM, 18 I/O 20 QFN 4x4mm T/R
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 16Fr

Specifications of PIC16F721T-I/ML

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 17
• Program Memory Size: 7KB (4K x 14)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 12x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PIC16F/LF720/721
9.1
When configuring and using the ADC the following
functions must be considered:
• Port configuration
• Channel selection
• ADC conversion clock source
• Interrupt control
9.1.1
When converting analog signals, the I/O pin selected
as the input channel should be configured for analog by
setting the associated TRIS and ANSEL bits. Refer to
Section 6.0 “I/O Ports”
9.1.2
There are 14 channel selections available:
Refer to
ule”
more information on these channel selections.
The CHS bits of the ADCON0 register determine which
channel is connected to the sample and hold circuit.
TABLE 9-1:
DS41430A-page 78
Legend: Shaded cells are outside of recommended range.
Note 1:
Note:
- AN<11:0> pins
- Temperature Indicator
- FVR (Fixed Voltage Reference) Output
Clock Source
and
F
F
F
2:
3:
4:
5:
F
F
F
ADC Clock Period (T
OSC
OSC
OSC
ADC
OSC
OSC
OSC
ADC Configuration
F
Section 10.0 “Fixed Voltage Reference”
Section 11.0 “Temperature Indicator Mod-
RC
The F
These values violate the minimum required T
For faster conversion times, the selection of another clock source is recommended.
When the device frequency is greater than 1 MHz, the F
conversion will be performed during Sleep.
Recommended values for V
avoided for temperature > 85°C.
PORT CONFIGURATION
Analog voltages on any pin that is defined
as a digital input may cause the input buf-
fer to conduct excess current.
CHANNEL SELECTION
/16
/32
/64
/2
/4
/8
RC
ADC CLOCK PERIOD (T
source has a typical T
for more information.
ADCS<2:0>
000
100
001
101
010
110
AD
x11
)
DD
AD
 2.0V and temperature -40°C to 85°C. The 16.0 s setting should be
1.0-6.0 s
time of 1.6 s for V
AD
125 ns
250 ns
0.5 s
16 MHz
1.0 s
2.0 s
4.0 s
) V
for
S
(2)
(2)
(2)
. DEVICE OPERATING FREQUENCIES
(1,4)
AD
time.
When changing channels, a delay is required before
starting the next conversion. Refer to
“ADC Operation”
9.1.3
The source of the conversion clock is software
selectable via the ADCS bits of the ADCON1 register.
There are seven possible clock options:
• F
• F
• F
• F
• F
• F
• F
The time to complete one bit conversion is defined as
T
as shown in
For
specification must be met. Refer to the A/D conversion
requirements
Specifications”
examples of appropriate ADC clock selections.
1.0-6.0 s
AD
DD
Note:
Device Frequency (F
250 ns
500 ns
OSC
OSC
OSC
OSC
OSC
OSC
RC
. One full 8-bit conversion requires 10 T
.
8 MHz
8 s
RC
1.0 s
2.0 s
4.0 s
correct
(dedicated internal oscillator)
/2
/4
/8
/16
/32
/64
clock source is only recommended if the
(5)
(2)
(2)
(1,4)
Unless using the F
system clock frequency will change the
ADC
adversely affect the ADC result.
CONVERSION CLOCK
Figure
conversion,
for more information.
in
for more information.
clock
9-2.
1.0-6.0 s
16.0 s
500 ns
8 s
4 MHz
1.0 s
2.0 s
4.0 s
 2010 Microchip Technology Inc.
Section 23.0
OSC
frequency,
(5)
(2)
)
(5)
(1,4)
the
RC
, any changes in the
appropriate
1.0-6.0 s
Table 9-1
16.0 s
32.0 s
64.0 s
which
1 MHz
8 s
2.0 s
4.0 s
Section 9.2
“Electrical
AD
(5)
periods
(5)
(3)
(3)
(1,4)
gives
may
T
AD