PIC18F86J50T-I/PT Microchip Technology, PIC18F86J50T-I/PT Datasheet - Page 333

• Manufacturer Part Number: PIC18F86J50T-I/PT
• Description: IC,MICROCONTROLLER,8-BIT,PIC CPU,CMOS,TQFP,64PIN,PLASTIC
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F86J50T-I/PT

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 48MHz
• Connectivity: EBI/EMI, I²C, SPI, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Number Of I /o: 65
• Program Memory Size: 64KB (32K x 16)
• Program Memory Type: FLASH
• 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
• Package / Case: 80-TFQFP
• Processor Series: PIC18F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 3904 B
• Interface Type: I2C, MSSP, SPI, EUSART
• Maximum Clock Frequency: 48 MHz
• Number Of Programmable I/os: 65
• 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, ICE2000, ICE4000, DV164136, DM183022, DM183032
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 12 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: AC162087 - HEADER MPLAB ICD2 18F87J50 68/84MA180021 - MODULE PLUG-IN 18F87J50 FS USBAC164328 - MODULE SKT FOR 80TQFP
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details
• Other names: PIC18F86J50T-I/PTTR

EQUATION 22-1:
EXAMPLE 22-2:
© 2009 Microchip Technology Inc.
For this example, the following assumptions are made about the application:
• 3.3V will be applied to V
• This is a full-speed application that uses one interrupt IN endpoint that can send one packet of 64 bytes every
• A regular USB “B” or “mini-B” connector will be used on the application circuit board.
In this case, P
IN endpoint. All 64 kBps of data could potentially be bytes of value, 00h. Since ‘0’ bits cause toggling of the output
state of the transceiver, they cause the USB transceiver to consume extra current charging/discharging the cable. In
this case, 100% of the data bits sent can be of value ‘0’. This should be considered the “max” value, as normal data
will consist of a fair mix of ones and zeros.
This application uses 64 kBps for IN traffic out of the total bus bandwidth of 1.5 MBps (12 Mbps), therefore:
Since a regular “B” or “mini-B” connector is used in this application, the end user may plug in any type of cable up to
the maximum allowed 5 m length. Therefore, we use the worst-case length:
Assume I
USB bandwidth is shared between all the devices which are plugged into the root port (via hubs). If the application is
plugged into a USB 1.1 hub that has other devices plugged into it, your device may see host to device traffic on the
bus, even if it is not addressed to your device. Since any traffic, regardless of source, can increase the I
above the base 218 μA, it is safest to allow for the worst case of 2.2 mA.
Therefore:
Legend: V
1 ms, with no restrictions on the values of the bytes being sent. The application may or may not have additional
traffic on OUT endpoints.
L
CABLE
† The calculated value should be considered an approximation and additional guardband or applica-
PULLUP
tion-specific product testing is recommended. The transceiver current is “in addition to” the rest of the
current consumed by the PIC18F87J10 family device that is needed to run the core, drive the other I/O
lines, power the various modules, etc.
P
P
L
applications use cables no longer than 5m.
I
cable. On the host or hub end of the USB cable, 15 kΩ nominal resistors (14.25 kΩ to 24.8 kΩ) are
present which pull both the D+ and D- lines to ground. During bus Idle conditions (such as between
packets or during USB Suspend mode), this results in up to 218 μA of quiescent current drawn at 3.3V.
I
is fully utilized (either IN or OUT traffic) for data that drives the lines to the “K” state most of the time.
PULLUP
PULLUP
= 5 meters
CABLE
ZERO
USB
ZERO
IN
– Percentage (in decimal) of total bus bandwidth that is used for IN traffic.
= 2.2 mA. The actual value of I
– Voltage applied to the V
– Percentage (in decimal) of the IN traffic bits sent by the PIC
= 100% = 1, because there should be no restriction on the value of the data moving through the
is also dependant on bus traffic conditions and can be as high as 2.2 mA when the USB bandwidth
– Length (in meters) of the USB cable. The USB 2.0 specification requires that full-speed
– Current which the nominal, 1.5 kΩ pull-up resistor (when enabled) must supply to the USB
ESTIMATING USB TRANSCEIVER CURRENT CONSUMPTION
CALCULATING USB TRANSCEIVER CURRENT
USB
I
I
and V
XCVR
XCVR
=
=
DD
(60 mA • V
, with the core voltage regulator enabled.
(60 mA • 3.3V • 1 • 0.043 • 5m)
Pin =
USB
(3.3V • 5m)
pin in volts. (Should be 3.0V to 3.6V.)
1.5 MBps
PULLUP
USB
64 kBps
(3.3V • 5m)
• P
ZERO
will likely be closer to 218 μA, but allow for the worst-case.
= 4.3% = 0.043
PIC18F87J50 FAMILY
• P
IN
• L
CABLE
+ 2.2 mA = 4.8 mA
)
+ I
†
PULLUP
®
device that are a value of ‘0’.
DS39775C-page 333
PULLUP
current