PIC18C242 MICROCHIP [Microchip Technology], PIC18C242 Datasheet - Page 170
PIC18C242
Manufacturer Part Number
PIC18C242
Description
High-Performance Microcontrollers with 10-Bit A/D
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18C242.pdf
(296 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC18C242-I/SO
Manufacturer:
MICROCHIP
Quantity:
2 000
Company:
Part Number:
PIC18C242/JW
Manufacturer:
NS
Quantity:
10
- Current page: 170 of 296
- Download datasheet (5Mb)
PIC18CXX2
The value that is in the ADRESH/ADRESL registers is
not modified for a Power-on Reset. The ADRESH/
ADRESL registers will contain unknown data after a
Power-on Reset.
After the A/D module has been configured as desired,
the selected channel must be acquired before the con-
version is started. The analog input channels must
have their corresponding TRIS bits selected as an
input. To determine acquisition time, see Section 16.1.
After this acquisition time has elapsed, the A/D conver-
sion can be started. The following steps should be fol-
lowed for doing an A/D conversion:
1.
2.
3.
4.
5.
6.
7.
FIGURE 16-2: ANALOG INPUT MODEL
DS39026B-page 170
Configure the A/D module:
• Configure analog pins, voltage reference and
• Select A/D input channel (ADCON0)
• Select A/D conversion clock (ADCON0)
• Turn on A/D module (ADCON0)
Configure A/D interrupt (if desired):
• Clear ADIF bit
• Set ADIE bit
• Set GIE bit
Wait the required acquisition time.
Start conversion:
• Set GO/DONE bit (ADCON0)
Wait for A/D conversion to complete, by either:
• Polling for the GO/DONE bit to be cleared
OR
• Waiting for the A/D interrupt
Read A/D Result registers (ADRESH/ADRESL);
clear bit ADIF if required.
For next conversion, go to step 1 or step 2 as
required. The A/D conversion time per bit is
defined as T
required before next acquisition starts.
digital I/O (ADCON1)
Legend: C
V
AIN
Rs
V
I
R
SS
C
AD
LEAKAGE
T
PIN
IC
HOLD
. A minimum wait of 2T
ANx
C
5 pF
PIN
= input capacitance
= threshold voltage
= leakage current at the pin due to
= interconnect resistance
= sampling switch
= sample/hold capacitance (from DAC)
various junctions
V
DD
V
V
T
T
AD
= 0.6V
= 0.6V
is
Preliminary
I leakage
± 500 nA
16.1
For the A/D converter to meet its specified accuracy,
the charge holding capacitor (C
to fully charge to the input channel voltage level. The
analog input model is shown in Figure 16-2. The
source impedance (R
switch (R
required to charge the capacitor C
switch (R
(V
at the analog input (due to pin leakage current). The
maximum recommended impedance for analog
sources is 2.5k . After the analog input channel is
selected (changed), this acquisition must be done
before the conversion can be started.
R
IC
DD
Note:
1k
). The source impedance affects the offset voltage
A/D Acquisition Requirements
SS
V
SS
When the conversion is started, the hold-
ing capacitor is disconnected from the
input pin.
SS
DD
) impedance varies over the device voltage
Sampling
Switch
) impedance directly affect the time
6V
5V
4V
3V
2V
R
SS
S
Sampling Switch
5 6 7 8 9 10 11
) and the internal sampling
V
7/99 Microchip Technology Inc.
SS
C
HOLD
HOLD
= 120 pF
HOLD
) must be allowed
( k )
. The sampling
Related parts for PIC18C242
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
IC, 8BIT MCU, PIC18F, 40MHZ, LCC-44
Manufacturer:
Microchip Technology
Datasheet:
Part Number:
Description:
IC, 8BIT MCU, PIC18LF, 40MHZ, PLCC-64
Manufacturer:
Microchip Technology
Datasheet:
Part Number:
Description:
IC, 8BIT MCU, PIC18F, 64MHZ, TQFP-80
Manufacturer:
Microchip Technology
Datasheet:
Part Number:
Description:
MCU, MPU & DSP Development Tools CAN/LIN PICtail Plus Daughter Board
Manufacturer:
Microchip Technology
Datasheet:
Part Number:
Description:
IC, 8BIT MCU, PIC18F, 64MHZ, DIP-40
Manufacturer:
Microchip Technology
Datasheet:
Part Number:
Description:
IC, 8BIT MCU, PIC18LF, 40MHZ, PLCC-64
Manufacturer:
Microchip Technology
Datasheet:
Part Number:
Description:
IC, 8BIT MCU, PIC18F, 64MHZ, TQFP-64
Manufacturer:
Microchip Technology
Part Number:
Description:
IC, 8BIT MCU, PIC18F, 64MHZ, TQFP-80
Manufacturer:
Microchip Technology
Part Number:
Description:
8KB, Flash, 768bytes-RAM, 36I/O, 8-bit Family,nanowatt XLP 40 UQFN 5x5x0.5mm TUB
Manufacturer:
Microchip Technology
Datasheet:
Part Number:
Description:
8KB, Flash, 768bytes-RAM, 36I/O, 8-bit Family,nanowatt XLP 40 UQFN 5x5x0.5mm TUB
Manufacturer:
Microchip Technology
Part Number:
Description:
16KB, Flash, 768bytes-RAM, 36I/O, 8-bit Family,nanowatt XLP 40 UQFN 5x5x0.5mm TU
Manufacturer:
Microchip Technology
Datasheet:
Part Number:
Description:
16KB, Flash, 768bytes-RAM, 36I/O, 8-bit Family,nanowatt XLP 40 UQFN 5x5x0.5mm TU
Manufacturer:
Microchip Technology
Part Number:
Description:
32KB, Flash, 1536bytes-RAM, 36I/O, 8-bit Family,nanowatt XLP 40 UQFN 5x5x0.5mm T
Manufacturer:
Microchip Technology
Datasheet:
Part Number:
Description:
32KB, Flash, 1536bytes-RAM, 36I/O, 8-bit Family,nanowatt XLP 40 UQFN 5x5x0.5mm T
Manufacturer:
Microchip Technology
Part Number:
Description:
64KB, Flash, 3968bytes-RAM, 36I/O, 8-bit Family,nanowatt XLP 40 UQFN 5x5x0.5mm T
Manufacturer:
Microchip Technology
Datasheet: