PIC18F67K90-I/MR Microchip Technology, PIC18F67K90-I/MR Datasheet - Page 413
![no-image](/images/manufacturer_photos/0/4/439/microchip_technology_sml.jpg)
PIC18F67K90-I/MR
Manufacturer Part Number
PIC18F67K90-I/MR
Description
128kB Flash, 4kB RAM, 1kB EE, NanoWatt XLP, LCD 64 QFN 9x9x0.9mm TUBE
Manufacturer
Microchip Technology
Series
PIC® XLP™ 18Fr
Datasheet
1.PIC18F66K90-IMR.pdf
(570 pages)
Specifications of PIC18F67K90-I/MR
Core Processor
PIC
Core Size
8-Bit
Speed
64MHz
Connectivity
I²C, LIN, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, LCD, POR, PWM, WDT
Number Of I /o
53
Program Memory Size
128KB (64K x 16)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 16x12b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-VFQFN Exposed Pad
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC18F67K90-I/MR
Manufacturer:
MICROCHIP
Quantity:
3 000
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The CTMU current source may be trimmed with the
trim bits in CTMUICON using an iterative process to get
the exact current desired. Alternatively, the nominal
value without adjustment may be used. That value may
be stored by software for use in all subsequent
capacitive or time measurements.
To calculate the value for R
must be chosen. 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 A, the resistor value needed is calculated as,
R
if the current source is chosen to be 5.5 A, R
be 420,000 Ω, and 42,000 Ω if the current source is set
to 55 A.
FIGURE 27-2:
2009-2011 Microchip Technology Inc.
CAL
= 2.31V/0.55 A , for a value of 4.2 M Ω . Similarly,
R
ANx
CAL
CTMU CURRENT SOURCE
CALIBRATION CIRCUIT
Current Source
MUX
PIC18F87K90
CAL
A/D Converter
, the nominal current
A/D
A/D
Trigger
CTMU
CAL
would
PIC18F87K90 FAMILY
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. If an exact current is chosen to
incorporate the trimming bits from CTMUICON, the
resistor value of R
ingly. R
resistor values. R
available, in light of the precision needed for the circuit
that the CTMU will be measuring. A recommended
minimum would be 0.1% tolerance.
The following examples show a typical method for
performing a CTMU current calibration.
•
•
Example 27-1
A/D Converter and the CTMU.
This routine is typical for applications using both
modules.
Example 27-2
actual calibration routine.
This method manually triggers the A/D Converter to
demonstrate the entire step-wise process. It is also
possible to automatically trigger the conversion by
setting the CTMU’s CTTRIG bit (CTMUCONH<0>).
CAL
may also be adjusted to allow for available
demonstrates how to initialize the
demonstrates one method for the
CAL
CAL
should be of the highest precision
may need to be adjusted accord-
DS39957D-page 413
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