PIC18F66J90-I/PT Microchip Technology, PIC18F66J90-I/PT Datasheet - Page 306
![IC PIC MCU FLASH 64KB 64-TQFP](/photos/6/81/68123/c04-066_pf_sml.jpg)
PIC18F66J90-I/PT
Manufacturer Part Number
PIC18F66J90-I/PT
Description
IC PIC MCU FLASH 64KB 64-TQFP
Manufacturer
Microchip Technology
Series
PIC® 18Fr
Datasheets
1.PIC18F67J90-IPT.pdf
(450 pages)
2.PIC18F67J90-IPT.pdf
(3 pages)
3.PIC18F67J90-IPT.pdf
(10 pages)
4.PIC18F66J90-IPT.pdf
(444 pages)
Specifications of PIC18F66J90-I/PT
Program Memory Type
FLASH
Program Memory Size
64KB (32K x 16)
Package / Case
64-TFQFP
Core Processor
PIC
Core Size
8-Bit
Speed
48MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, LCD, LVD, POR, PWM, WDT
Number Of I /o
51
Ram Size
3.8K x 8
Voltage - Supply (vcc/vdd)
2 V ~ 3.6 V
Data Converters
A/D 12x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Processor Series
PIC18F
Core
PIC
Data Bus Width
8 bit
Data Ram Size
3923 B
Interface Type
AUSART, EUSART, I2C, SPI
Maximum Clock Frequency
48 MHz
Number Of Programmable I/os
51
Number Of Timers
4
Operating Supply Voltage
2.65 V to 3.6 V
Maximum Operating Temperature
+ 85 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, DV164136, DM163030
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 12 Channel
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
AC162079 - HEADER MPLAB ICD2 18F85J90 64/80AC164328 - MODULE SKT FOR 80TQFP
Eeprom Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC18F66J90-I/PT
Manufacturer:
Microchip Technology
Quantity:
10 000
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PIC18F87J90 FAMILY
23.1
The CTMU works by using a fixed current source to
charge a circuit. The type of circuit depends on the type
of measurement being made. In the case of charge
measurement, the current is fixed, and the amount of
time the current is applied to the circuit is fixed. The
amount of voltage read by the A/D is then a measure-
ment of the capacitance of the circuit. In the case of
time measurement, the current, as well as the capaci-
tance of the circuit, is fixed. In this case, the voltage
read by the A/D is then representative of the amount of
time elapsed from the time the current source starts
and stops charging the circuit.
If the CTMU is being used as a time delay, both capaci-
tance and current source are fixed, as well as the voltage
supplied to the comparator circuit. The delay of a signal
is determined by the amount of time it takes the voltage
to charge to the comparator threshold voltage.
23.1.1
The operation of the CTMU is based on the equation
for charge:
More simply, the amount of charge measured in
coulombs in a circuit is defined as current in amperes
(I) multiplied by the amount of time in seconds that the
current flows (t). Charge is also defined as the capaci-
tance in farads (C) multiplied by the voltage of the
circuit (V). It follows that:
The CTMU module provides a constant, known current
source. The A/D Converter is used to measure (V) in
the equation, leaving two unknowns: capacitance (C)
and time (t). The above equation can be used to calcu-
late capacitance or time, by either the relationship
using the known fixed capacitance of the circuit:
or by:
using a fixed time that the current source is applied to
the circuit.
23.1.2
At the heart of the CTMU is a precision current source,
designed to provide a constant reference for measure-
ments. The level of current is user-selectable across
three ranges or a total of two orders of magnitude, with
the ability to trim the output in ±2% increments
(nominal). The current range is selected by the
IRNG<1:0> bits (CTMUICON<9:8>), with a value of
‘00’ representing the lowest range.
DS39933C-page 304
CTMU Operation
THEORY OF OPERATION
CURRENT SOURCE
C
t
C
I t ⋅
=
=
=
I
(
C V
(
⋅
=
I t ⋅
dV
------ -
dT
⋅
C V.
) V ⁄
⋅
) I ⁄
Preliminary
Current trim is provided by the ITRIM<5:0> bits
(CTMUICON<7:2>). These six bits allow trimming of
the current source in steps of approximately 2% per
step. Note that half of the range adjusts the current
source positively and the other half reduces the current
source. A value of ‘000000’ is the neutral position (no
change). A value of ‘100000’ is the maximum negative
adjustment (approximately -62%), and ‘011111’ is the
maximum positive adjustment (approximately +62%).
23.1.3
CTMU measurements are controlled by edge events
occurring on the module’s two input channels. Each
channel, referred to as Edge 1 and Edge 2, can be con-
figured to receive input pulses from one of the edge
input pins (CTEDG1 and CTEDG2) or CCPx Special
Event Triggers. The input channels are level-sensitive,
responding to the instantaneous level on the channel
rather than a transition between levels. The inputs are
selected using the EDG1SEL and EDG2SEL bit pairs
(CTMUCONL<3:2, 6:5>).
In addition to source, each channel can be configured for
event polarity using the EDGE2POL and EDGE1POL
bits (CTMUCONL<7,4>). The input channels can also
be filtered for an edge event sequence (Edge 1 occur-
ring before Edge 2) by setting the EDGSEQEN bit
(CTMUCONH<2>).
23.1.4
The CTMUCON register also contains two status bits,
EDG2STAT and EDG1STAT (CTMUCONL<1:0>).
Their primary function is to show if an edge response
has occurred on the corresponding channel. The
CTMU automatically sets a particular bit when an edge
response is detected on its channel. The level-sensitive
nature of the input channels also means that the status
bits become set immediately if the channel’s configura-
tion is changed and is the same as the channel’s
current state.
The module uses the edge status bits to control the cur-
rent source output to external analog modules (such as
the A/D Converter). Current is only supplied to external
modules when only one (but not both) of the status bits
is set, and shuts current off when both bits are either
set or cleared. This allows the CTMU to measure cur-
rent only during the interval between edges. After both
status bits are set, it is necessary to clear them before
another measurement is taken. Both bits should be
cleared simultaneously, if possible, to avoid re-enabling
the CTMU current source.
In addition to being set by the CTMU hardware, the
edge status bits can also be set by software. This is
also the user’s application to manually enable or dis-
able the current source. Setting either one (but not
both) of the bits enables the current source. Setting or
clearing both bits at once disables the source.
EDGE SELECTION AND CONTROL
EDGE STATUS
© 2009 Microchip Technology Inc.
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