PIC18LF24J50-I/ML Microchip Technology, PIC18LF24J50-I/ML Datasheet - Page 400
![IC PIC MCU FLASH 16K 2V 28-QFN](/photos/6/81/68120/150-28-qfn_sml.jpg)
PIC18LF24J50-I/ML
Manufacturer Part Number
PIC18LF24J50-I/ML
Description
IC PIC MCU FLASH 16K 2V 28-QFN
Manufacturer
Microchip Technology
Series
PIC® XLP™ 18Fr
Datasheets
1.PIC18LF24J10-ISS.pdf
(32 pages)
2.PIC18LF24J50-ISS.pdf
(554 pages)
3.PIC18LF24J50-ISS.pdf
(12 pages)
Specifications of PIC18LF24J50-I/ML
Program Memory Type
FLASH
Program Memory Size
16KB (8K x 16)
Package / Case
28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
Core Processor
PIC
Core Size
8-Bit
Speed
48MHz
Connectivity
I²C, SPI, UART/USART, USB
Peripherals
Brown-out Detect/Reset, DMA, POR, PWM, WDT
Number Of I /o
16
Ram Size
3.8K x 8
Voltage - Supply (vcc/vdd)
2 V ~ 3.6 V
Data Converters
A/D 10x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Processor Series
PIC18LF
Core
PIC
Data Bus Width
8 bit
Data Ram Size
16 KB
Interface Type
EUSART, I2C, SPI
Maximum Clock Frequency
31 KHz
Number Of Programmable I/os
16
Number Of Timers
5
Operating Supply Voltage
2 V to 3.6 V
Maximum Operating Temperature
+ 125 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, DM183032, DM183022, MA180024, DV164136
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 10 Channel
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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- Download datasheet (9Mb)
PIC18F46J50 FAMILY
The CTMU current source may be trimmed with the
trim bits in CTMUICON using an iterative process to get
an exact desired current. Alternatively, the nominal
value without adjustment may be used; it may be
stored by the software for use in all subsequent
capacitive or time measurements.
To calculate the value for R
must be chosen, and then the resistance can be
calculated. For example, if the A/D Converter reference
voltage is 3.3V, use 70% of full scale, or 2.31V as the
desired approximate voltage to be read by the A/D
Converter. If the range of the CTMU current source is
selected to be 0.55 μA, the resistor value needed is cal-
culated as R
Similarly, if the current source is chosen to be 5.5 μA,
R
source is set to 55 μA.
FIGURE 25-2:
DS39931C-page 400
CAL
would be 420,000Ω, and 42,000Ω if the current
ANx
R
CAL
CAL
= 2.31V/0.55 μA, for a value of 4.2 MΩ.
CTMU CURRENT SOURCE
CALIBRATION CIRCUIT
Current Source
MUX
PIC18F46J50 Device
CAL
A/D Converter
, the nominal current
A/D
CTMU
A value of 70% of full-scale voltage is chosen to make
sure that the A/D Converter was in a range that is well
above the noise floor. Keep in mind that if an exact cur-
rent is chosen that is to incorporate the trimming bits
from CTMUICON, the resistor value of R
to be adjusted accordingly. R
to allow for available resistor values. R
the highest precision available, keeping in mind the
amount of precision needed for the circuit that the
CTMU will be used to measure. A recommended
minimum would be 0.1% tolerance.
The following examples show one typical method for
performing a CTMU current calibration. Example 25-1
demonstrates how to initialize the A/D Converter and
the CTMU; this routine is typical for applications using
both modules. Example 25-2 demonstrates one
method for the actual calibration routine.
© 2009 Microchip Technology Inc.
CAL
may also be adjusted
CAL
CAL
should be of
may need
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