PIC18LF44J50-I/PT Microchip Technology, PIC18LF44J50-I/PT Datasheet - Page 372
![IC PIC MCU FLASH 16K 2V 44-TQFP](/photos/6/82/68251/c04-076_pt_sml.jpg)
PIC18LF44J50-I/PT
Manufacturer Part Number
PIC18LF44J50-I/PT
Description
IC PIC MCU FLASH 16K 2V 44-TQFP
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 PIC18LF44J50-I/PT
Program Memory Type
FLASH
Program Memory Size
16KB (8K x 16)
Package / Case
44-TQFP, 44-VQFP
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
34
Ram Size
3.8K x 8
Voltage - Supply (vcc/vdd)
2 V ~ 3.6 V
Data Converters
A/D 13x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Processor Series
PIC18LF
Core
PIC
Data Bus Width
8 bit
Data Ram Size
3776 B
Interface Type
EUSART, I2C, SPI
Maximum Clock Frequency
31 KHz
Number Of Programmable I/os
22
Number Of Timers
5
Operating Supply Voltage
2 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, DM183022, DM183032, DV164136, MA180024
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 13 Channel
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC18LF44J50-I/PT
Manufacturer:
Microchip Technology
Quantity:
10 000
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PIC18F46J50 FAMILY
21.6
Many USB applications will likely have several different
sets of power requirements and configuration. The
most common power modes encountered are Bus
Power Only, Self-Power Only and Dual Power with
Self-Power Dominance. The most common cases are
presented here. Also provided is a means of estimating
the current consumption of the USB transceiver.
21.6.1
In Bus Power Only mode, all power for the application
is drawn from the USB (Figure 21-9). This is effectively
the simplest power method for the device.
In order to meet the inrush current requirements of the
USB 2.0 Specification, the total effective capacitance
appearing across V
than 10 µF. If not, some kind of inrush timing is
required. For more details, see Section 7.2.4 of the
USB 2.0 Specification.
According to the USB 2.0 Specification, all USB
devices must also support a Low-Power Suspend
mode. In the USB Suspend mode, devices must
consume no more than 2.5 mA from the 5V V
of the USB cable.
The host signals the USB device to enter the Suspend
mode by stopping all USB traffic to that device for more
than 3 ms. This condition will cause the IDLEIF bit in
the UIR register to become set.
During the USB Suspend mode, the D+ or D- pull-up
resistor must remain active, which will consume some
of the allowed suspend current: 2.5 mA budget.
FIGURE 21-9:
21.6.2
In Self-Power Only mode, the USB application provides
its own power, with very little power being pulled from
the USB. See Figure 21-10 for an example.
Note that an attach indication is added to indicate when
the USB has been connected and the host is actively
powering V
DS39931C-page 372
V
~5V
BUS
Low I
USB Power Modes
BUS
BUS POWER ONLY
SELF-POWER ONLY
Q
Regulator
.
BUS
3.3V
BUS POWER ONLY
and ground must be no more
V
V
V
USB
DD
SS
BUS
line
In order to meet compliance specifications, the USB
module (and the D+ or D- pull-up resistor) should not be
enabled until the host actively drives V
the 5.5V tolerant I/O pins may be used for this purpose.
The application should never source any current onto
the 5V V
FIGURE 21-10:
21.6.3
Some applications may require a dual power option.
This allows the application to use internal power
primarily, but switch to power from the USB when no
internal power is available. See Figure 21-11 for a
simple Dual Power with Self-Power Dominance mode
example, which automatically switches between
Self-Power Only and USB Bus Power Only modes.
Dual power devices must also meet all of the special
requirements for inrush current and Suspend mode
current and must not enable the USB module until
V
Only” and Section 21.6.2 “Self-Power Only” for
descriptions of those requirements. Additionally, dual
power devices must never source current onto the 5V
V
FIGURE 21-11:
V
BUS
BUS
V
~3.3V
~5V
Note:
BUS
V
SELF
~5V
BUS
Regulator
pin of the USB cable.
is driven high. See Section 21.6.1 “Bus Power
Low I
100 kΩ
BUS
V
~3.3V
100 kΩ
SELF
DUAL POWER WITH SELF-POWER
DOMINANCE
Q
Users should keep in mind the limits for
devices drawing power from the USB.
According to USB Specification 2.0, this
cannot exceed 100 mA per low-power
device or 500 mA per high-power device.
pin of the USB cable.
3.3V
100 kΩ
SELF-POWER ONLY
DUAL POWER EXAMPLE
© 2009 Microchip Technology Inc.
Attach Sense
Attach Sense
100 kΩ
BUS
5.5V Tolerant
I/O pin
V
V
V
DD
USB
SS
high. One of
I/O pin
V
V
V
DD
USB
SS
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