PIC18F2423 MICROCHIP [Microchip Technology], PIC18F2423 Datasheet - Page 237
![no-image](/images/no-image-200.jpg)
PIC18F2423
Manufacturer Part Number
PIC18F2423
Description
28/40/44-Pin, Enhanced Flash Microcontrollers with 12-Bit A/D and nanoWatt Technology
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18F2423.pdf
(392 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC18F2423-I/SP
Manufacturer:
MICROCHIP
Quantity:
1 290
Part Number:
PIC18F2423-I/SP
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
- Current page: 237 of 392
- Download datasheet (7Mb)
19.6
Figure 19-4 shows the operation of the A/D converter
after the GO/DONE bit has been set and the
ACQT2:ACQT0 bits are cleared. A conversion is
started after the following instruction to allow entry into
Sleep mode before the conversion begins.
Figure 19-5 shows the operation of the A/D converter
after the GO/DONE bit has been set and the
ACQT2:ACQT0 bits are set to ‘010’ and selecting a
4 T
Clearing the GO/DONE bit during a conversion will abort
the current conversion. The A/D Result register pair will
NOT be updated with the partially completed A/D
conversion sample. This means the ADRESH:ADRESL
registers will continue to contain the value of the last
completed conversion (or the last value written to the
ADRESH:ADRESL registers).
FIGURE 19-4:
FIGURE 19-5:
© 2007 Microchip Technology Inc.
(Holding capacitor continues
acquiring input)
Set GO/DONE bit
T
AD
Set GO/DONE bit
CY
Holding capacitor is disconnected from analog input (typically 100 ns)
1
acquisition time before the conversion starts.
– T
T
ACQT
A/D Conversions
Acquisition
AD
Automatic
2
Time
T
AD
Cycles
1 T
3
Conversion starts
b11
AD
A/D CONVERSION T
A/D CONVERSION T
2 T
4
AD
b10
1
3 T
Conversion starts
(Holding capacitor is disconnected)
Points to end of T
AD
b11
b9
2
4 T
b10
AD
On the following cycle:
ADRESH:ADRESL are loaded, GO/DONE bit is cleared,
ADIF bit is set, holding capacitor is connected to analog input.
3
b8
5 T
On the following cycle:
ADRESH:ADRESL are loaded, GO/DONE bit is cleared,
ADIF bit is set, holding capacitor is connected to analog input.
PIC18F2423/2523/4423/4523
AD
AD
b9
AD
4
b7
ACQT
6 T
CYCLES (ACQT<2:0> = 000, T
CYCLES (ACQT<2:0> = 010, T
Preliminary
b8
5
AD
period (current black arrow)
b6
7 T
T
b7
6
AD
AD
b5
8
Cycles
After the A/D conversion is completed or aborted, a
2 T
be started. After this wait, acquisition on the selected
channel is automatically started.
19.7
The discharge phase is used to initialize the value of
the holding capacitor. The array is discharged before
every sample. This feature helps to optimize the unity-
gain amplifier, as the circuit always needs to charge the
capacitor array, rather than charge/discharge based on
previous measure values.
b6
7
Note:
T
CY
AD
b4
wait is required before the next acquisition can
9 T
b5
8
Discharge
AD
b3
The GO/DONE bit should NOT be set in
the same instruction that turns on the A/D.
Code should wait at least 3 T
enabling the A/D before beginning an
acquisition and conversion cycle.
10
b4
9
T
AD
b2
11
10
b3
T
ACQ
ACQ
AD
b1
11
b2
12
= 0)
= 4 T
T
AD
b0
12
b1
13
AD
DS39755B-page 235
)
T
Discharge
(typically 200 ns)
b0
13
AD
1
T
Discharge
(typically
200 ns)
AD
AD
1
after
Related parts for PIC18F2423
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![PIC18F-LF1XK50](/images/no-image3.png)
Part Number:
Description:
20-Pin USB Flash Microcontrollers
Manufacturer:
MICROCHIP [Microchip Technology]
Datasheet:
![PIC18F6393T-I/PT](/photos/6/81/68123/c04-066_pf_tmb.jpg)
Part Number:
Description:
PIC18F With 128-segment LCD Driver And 12-bit ADC, 8KB Flash, 768B RAM, CCP, MSS
Manufacturer:
Microchip Technology
Datasheet:
![PIC18F6493T-I/PT](/photos/6/81/68123/c04-066_pf_tmb.jpg)
Part Number:
Description:
PIC18F With 128-segment LCD Driver And 12-bit ADC, 16KB Flash, 768B RAM, CCP, MS
Manufacturer:
Microchip Technology
Datasheet:
![PIC18F8393T-I/PT](/images/manufacturer_photos/0/4/439/microchip_technology_tmb.jpg)
Part Number:
Description:
PIC18F With 192-segment LCD Driver And 12-bit ADC, 8KB Flash, 768B RAM, CCP, MSS
Manufacturer:
Microchip Technology
Datasheet:
![PIC18F8493T-I/PT](/images/manufacturer_photos/0/4/439/microchip_technology_tmb.jpg)
Part Number:
Description:
PIC18F With 192-segment LCD Driver And 12-bit ADC, 16KB Flash, 768B RAM, CCP, MS
Manufacturer:
Microchip Technology
Datasheet:
![PIC18F6585-I/L](/photos/16/12/161282/68-plcc-large-300dpi-lyrd_tmb.jpg)
Part Number:
Description:
Microcontrollers (MCU) 48KB 3328 RAM 52 I/O
Manufacturer:
Microchip Technology
Datasheet:
![PIC18F6680-I/L](/photos/16/12/161282/68-plcc-large-300dpi-lyrd_tmb.jpg)
Part Number:
Description:
Microcontrollers (MCU) 64KB 3328 RAM 52 I/O
Manufacturer:
Microchip Technology
Datasheet:
![PIC18F65K90T-I/MR](/photos/16/3/160368/qfn64_tmb.jpg)
Part Number:
Description:
32kB Flash, 2kB RAM, 1kB EE, NanoWatt XLP, LCD 64 QFN 9x9x0.9mm T/R
Manufacturer:
Microchip Technology
Datasheet:
![PIC18F65K90T-I/PT](/photos/16/3/160367/tqfp-64_tmb.jpg)
Part Number:
Description:
32kB Flash, 2kB RAM, 1kB EE, NanoWatt XLP, LCD 64 TQFP 10x10x1mm T/R
Manufacturer:
Microchip Technology
Datasheet:
![PIC18F87K90T-I/PT](/photos/40/31/403173/tqfp-80_tmb.jpg)
Part Number:
Description:
128kB Flash, 4kB RAM, 1kB EE, 16MIPS, NanoWatt XLP, LCD, 5V 80 TQFP 12x12x1mm T/
Manufacturer:
Microchip Technology
Datasheet:
![PIC18F65K90-I/MR](/photos/16/3/160368/qfn64_tmb.jpg)
Part Number:
Description:
32kB Flash, 2kB RAM, 1kB EE, NanoWatt XLP, LCD 64 QFN 9x9x0.9mm TUBE
Manufacturer:
Microchip Technology
Datasheet:
![PIC18F65K90-I/PT](/photos/16/3/160367/tqfp-64_tmb.jpg)
Part Number:
Description:
32kB Flash, 2kB RAM, 1kB EE, NanoWatt XLP, LCD 64 TQFP 10x10x1mm TRAY
Manufacturer:
Microchip Technology
![PIC18F87K90-I/PT](/photos/40/31/403173/tqfp-80_tmb.jpg)
Part Number:
Description:
128kB Flash, 4kB RAM, 1kB EE, 16MIPS, NanoWatt XLP, LCD, 5V 80 TQFP 12x12x1mm TR
Manufacturer:
Microchip Technology
![PIC1-100-JT](/images/no-image3.png)
Part Number:
Description:
SURFACE MOUNT POWER INDUCTORS
Manufacturer:
RCD [RCD COMPONENTS INC.]
Datasheet: