PIC18F6493T-I/PT Microchip Technology, PIC18F6493T-I/PT Datasheet - Page 37

• Manufacturer Part Number: PIC18F6493T-I/PT
• Description: PIC18F With 128-segment LCD Driver And 12-bit ADC, 16KB Flash, 768B RAM, CCP, MS
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F6493T-I/PT

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, HLVD, LCD, POR, PWM, WDT
• Number Of I /o: 50
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: FLASH
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 12x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TFQFP
• Processor Series: PIC18F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 768 B
• Interface Type: AUSART, EUSART, I2C, MSSP, SPI
• Maximum Clock Frequency: 40 MHz
• Number Of Programmable I/os: 50
• Number Of Timers: 4
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, DV164136, DM163030
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 12 bit, 12 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details
• Other names: PIC18F6493T-I/PTTR

2.2
The ADCON2 register allows the user to select an
acquisition time that occurs each time the GO/DONE
bit is set. It also gives users the option to use an
automatically determined acquisition time.
Acquisition time may be set with the ACQT<2:0> bits
(ADCON2<5:3>), which provide a range of 2 to 20 T
When the GO/DONE bit is set, the A/D module contin-
ues to sample the input for the selected acquisition
time, then automatically begins a conversion. Since the
acquisition time is programmed, there may be no need
to wait for an acquisition time between selecting a
channel and setting the GO/DONE bit.
Manual
ACQT<2:0> = 000. When the GO/DONE bit is set,
sampling is stopped and a conversion begins. The user
is responsible for ensuring the required acquisition time
has passed between selecting the desired input
channel and setting the GO/DONE bit. This option is
also the default Reset state of the ACQT<2:0> bits and
is compatible with devices that do not offer
programmable acquisition times.
In either case, when the conversion is completed, the
GO/DONE bit is cleared, the ADIF flag is set and the
A/D begins sampling the currently selected channel
again. If an acquisition time is programmed, there is
nothing to indicate if the acquisition time has ended or
if the conversion has begun.
TABLE 2-1:
 2010 Microchip Technology Inc.
Note 1:
2:
Selecting and Configuring
Acquisition Time
The RC source has a typical T
For device frequencies above 1 MHz, the device must be in Sleep for the entire conversion or a F
divider should be used instead; otherwise, the A/D accuracy specification may not be met.
acquisition
Operation
16 T
32 T
64 T
2 T
4 T
8 T
T
RC
AD
OSC
OSC
OSC
OSC
OSC
OSC
(1)
vs. DEVICE OPERATING FREQUENCIES
A/D Clock Source (T
is
selected
AD
time of 2.5 s.
PIC18F6393/6493/8393/8493
AD
when
)
AD
.
ADCS<2:0>
000
100
001
101
010
110
x11
2.3
The A/D conversion time per bit is defined as T
The A/D conversion requires 13 T
version. The source of the A/D conversion clock is
software-selectable. There are seven possible
options for T
• 2 T
• 4 T
• 8 T
• 16 T
• 32 T
• 64 T
• Internal RC Oscillator
For correct A/D conversions, the A/D conversion clock
(T
minimum
information.)
Table 2-1 shows the resultant T
the device operating frequencies and the A/D clock
source selected.
AD
) must be as short as possible, but greater than the
OSC
OSC
OSC
OSC
OSC
OSC
Selecting the A/D Conversion
Clock
T
AD
AD
.
:
(See
Assumes T
parameter
Maximum F
2.5 MHz
1 MHz
10 MHz
20 MHz
40 MHz
40 MHz
5 MHz
AD
AD
times derived from
Min. = 0.8 s
AD
DS39896C-page 37
(2)
130
per 12-bit con-
OSC
for
OSC
more
AD
.