PIC18C252/JW Microchip Technology, PIC18C252/JW Datasheet - Page 170
![IC MCU 16x16 A/D 28CDIP](/photos/7/29/72984/150-28-cdip_sml.jpg)
PIC18C252/JW
Manufacturer Part Number
PIC18C252/JW
Description
IC MCU 16x16 A/D 28CDIP
Manufacturer
Microchip Technology
Series
PIC® 18Cr
Datasheets
1.PIC16F616T-ISL.pdf
(8 pages)
2.PIC16C770-ISO.pdf
(8 pages)
3.PIC18C242-ISO.pdf
(305 pages)
4.PIC18C242-ISO.pdf
(12 pages)
Specifications of PIC18C252/JW
Core Processor
PIC
Core Size
8-Bit
Speed
40MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, LVD, POR, PWM, WDT
Number Of I /o
22
Program Memory Size
32KB (16K x 16)
Program Memory Type
EPROM, UV
Ram Size
1.5K x 8
Voltage - Supply (vcc/vdd)
4.2 V ~ 5.5 V
Data Converters
A/D 5x10b
Oscillator Type
External
Operating Temperature
0°C ~ 70°C
Package / Case
28-CDIP (0.300", 7.62mm) Window
For Use With
XLT28XP - SOCKET TRANSITION ICE 28DIP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC18C252/JW
Manufacturer:
MICROCHIP
Quantity:
4 000
- PIC16F616T-ISL PDF datasheet
- PIC16C770-ISO PDF datasheet #2
- PIC18C242-ISO PDF datasheet #3
- PIC18C242-ISO PDF datasheet #4
- Current page: 170 of 305
- Download datasheet (6Mb)
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:
DS39026C-page 168
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
ANALOG INPUT MODEL
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
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 2.5 k . 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.
DD
SS
) 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
2000 Microchip Technology Inc.
V
SS
C
HOLD
HOLD
= 120 pF
HOLD
) must be allowed
(k )
. The sampling
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