PIC18F87J11T-I/PT Microchip Technology, PIC18F87J11T-I/PT Datasheet - Page 215
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PIC18F87J11T-I/PT
Manufacturer Part Number
PIC18F87J11T-I/PT
Description
IC PIC MCU FLASH 64KX16 80TQFP
Manufacturer
Microchip Technology
Series
PIC® 18Fr
Datasheets
1.PIC16F616T-ISL.pdf
(8 pages)
2.DV164136.pdf
(448 pages)
3.PIC18F63J11-IPT.pdf
(36 pages)
4.PIC18F66J11-IPT.pdf
(20 pages)
5.PIC18F84J11-IPT.pdf
(24 pages)
Specifications of PIC18F87J11T-I/PT
Core Size
8-Bit
Program Memory Size
128KB (64K x 16)
Oscillator Type
Internal
Core Processor
PIC
Speed
48MHz
Connectivity
EBI/EMI, I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, LVD, POR, PWM, WDT
Number Of I /o
68
Program Memory Type
FLASH
Ram Size
3930 x 8
Voltage - Supply (vcc/vdd)
2 V ~ 3.6 V
Data Converters
A/D 15x10b
Operating Temperature
-40°C ~ 85°C
Package / Case
80-TFQFP
Controller Family/series
PIC18
No. Of I/o's
68
Ram Memory Size
3930Byte
Cpu Speed
48MHz
No. Of Timers
5
No. Of Pwm
RoHS Compliant
Processor Series
PIC18F
Core
PIC
Data Bus Width
8 bit
Data Ram Size
3904 B
Interface Type
EUSART, I2C, MSSP, SPI
Maximum Clock Frequency
48 MHz
Number Of Programmable I/os
68
Number Of Timers
5
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, DM183032, DM183022, DV164136
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 15 Channel
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
DV164136 - DEVELOPMENT KIT FOR PIC18AC162091 - HEADER MPLAB ICD2 18F87J11 64/80MA180020 - MODULE PLUG-IN HPC EXPL 18F87J11AC164328 - MODULE SKT FOR 80TQFP
Eeprom Size
-
Lead Free Status / Rohs Status
Details
Other names
PIC18F87J11T-I/PTTR
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC18F87J11T-I/PT
Manufacturer:
Microchip Technology
Quantity:
10 000
- PIC16F616T-ISL PDF datasheet
- DV164136 PDF datasheet #2
- PIC18F63J11-IPT PDF datasheet #3
- PIC18F66J11-IPT PDF datasheet #4
- PIC18F84J11-IPT PDF datasheet #5
- Current page: 215 of 448
- Download datasheet (8Mb)
FIGURE 18-7:
18.4.5.1
In the Full-Bridge Output mode, the P1M1 bit in the
CCP1CON register allows users to control the forward/
reverse direction. When the application firmware
changes this direction control bit, the module will
assume the new direction on the next PWM cycle.
Just before the end of the current PWM period, the
modulated outputs (P1B and P1D) are placed in their
inactive state, while the unmodulated outputs (P1A and
P1C) are switched to drive in the opposite direction.
This occurs in a time interval of (4 T
Prescale Value) before the next PWM period begins.
The Timer2 prescaler will be either 1, 4 or 16, depend-
ing on the value of the T2CKPS bits (T2CON<1:0>).
During the interval from the switch of the unmodulated
outputs to the beginning of the next period, the
modulated outputs (P1B and P1D) remain inactive.
This relationship is shown in Figure 18-8.
Note that in the Full-Bridge Output mode, the ECCP1
module does not provide any dead-band delay. In gen-
eral, since only one output is modulated at all times,
dead-band delay is not required. However, there is a
situation where a dead-band delay might be required.
This situation occurs when both of the following
conditions are true:
1.
2.
© 2009 Microchip Technology Inc.
The direction of the PWM output changes when
the duty cycle of the output is at or near 100%.
The turn-off time of the power switch, including
the power device and driver circuit, is greater
than the turn-on time.
PIC18F87J11
Direction Change in Full-Bridge
Output Mode
P1A
P1B
P1C
P1D
EXAMPLE OF FULL-BRIDGE OUTPUT APPLICATION
OSC
* (Timer2
FET
Driver
FET
Driver
QA
QB
PIC18F87J11 FAMILY
Figure 18-9 shows an example where the PWM direc-
tion changes from forward to reverse at a near 100%
duty cycle. At time t1, the outputs, P1A and P1D,
become inactive, while output, P1C, becomes active. In
this example, since the turn-off time of the power
devices is longer than the turn-on time, a shoot-through
current may flow through power devices, QC and QD
(see Figure 18-7), for the duration of ‘t’. The same
phenomenon will occur to power devices, QA and QB,
for PWM direction change from reverse to forward.
If changing PWM direction at high duty cycle is required
for an application, one of the following requirements
must be met:
1.
2.
Other options to prevent shoot-through current may
exist.
Reduce PWM for a PWM period before
changing directions.
Use switch drivers that can drive the switches off
faster than they can drive them on.
Load
V+
V-
QC
QD
FET
Driver
FET
Driver
DS39778D-page 215
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