PIC18LF24J50-I/ML Microchip Technology, PIC18LF24J50-I/ML Datasheet - Page 377
![IC PIC MCU FLASH 16K 2V 28-QFN](/photos/6/81/68120/150-28-qfn_sml.jpg)
PIC18LF24J50-I/ML
Manufacturer Part Number
PIC18LF24J50-I/ML
Description
IC PIC MCU FLASH 16K 2V 28-QFN
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 PIC18LF24J50-I/ML
Program Memory Type
FLASH
Program Memory Size
16KB (8K x 16)
Package / Case
28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
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
16
Ram Size
3.8K x 8
Voltage - Supply (vcc/vdd)
2 V ~ 3.6 V
Data Converters
A/D 10x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Processor Series
PIC18LF
Core
PIC
Data Bus Width
8 bit
Data Ram Size
16 KB
Interface Type
EUSART, I2C, SPI
Maximum Clock Frequency
31 KHz
Number Of Programmable I/os
16
Number Of Timers
5
Operating Supply Voltage
2 V to 3.6 V
Maximum Operating Temperature
+ 125 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, MA180024, DV164136
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 10 Channel
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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The USB specification limits the power taken from the
bus. Each device is ensured 100 mA at approximately
5V (one unit load). Additional power may be requested,
up to a maximum of 500 mA.
Note that power above one unit load is a request and
the host or hub is not obligated to provide the extra cur-
rent. Thus, a device capable of consuming more than
one unit load must be able to maintain a low-power
configuration of a one unit load or less, if necessary.
The USB specification also defines a Suspend mode.
In this situation, current must be limited to 500 μA,
averaged over one second. A device must enter a
suspend state after 3 ms of inactivity (i.e., no SOF
tokens for 3 ms). A device entering Suspend mode
must drop current consumption within 10 ms after
suspend. Likewise, when signaling a wake-up, the
device must signal a wake-up within 10 ms of drawing
current above the suspend limit.
21.9.5
When the device is initially attached to the bus, the host
enters an enumeration process in an attempt to identify
the device. Essentially, the host interrogates the device,
gathering information such as power consumption, data
rates and sizes, protocol and other descriptive
information; descriptors contain this information. A
typical enumeration process would be as follows:
1.
2.
3.
4.
5.
6.
7.
8.
The exact enumeration process depends on the host.
21.9.6
There are eight different standard descriptor types, of
which, five are most important for this device.
21.9.6.1
The device descriptor provides general information,
such as manufacturer, product number, serial number,
the class of the device and the number of configurations.
There is only one device descriptor.
© 2009 Microchip Technology Inc.
USB Reset – Reset the device. Thus, the device
is not configured and does not have an address
(address 0).
Get Device Descriptor – The host requests a
small portion of the device descriptor.
USB Reset – Reset the device again.
Set Address – The host assigns an address to
the device.
Get Device Descriptor – The host retrieves the
device descriptor, gathering info such as
manufacturer, type of device, maximum control
packet size.
Get configuration descriptors.
Get any other descriptors.
Set a configuration.
ENUMERATION
DESCRIPTORS
Device Descriptor
PIC18F46J50 FAMILY
21.9.6.2
The configuration descriptor provides information on
the power requirements of the device and how many
different interfaces are supported when in this configu-
ration. There may be more than one configuration for a
device (i.e., low-power and high-power configurations).
21.9.6.3
The interface descriptor details the number of end-
points used in this interface, as well as the class of the
interface. There may be more than one interface for a
configuration.
21.9.6.4
The endpoint descriptor identifies the transfer type
(Section 21.9.3 “Transfers”) and direction, and some
other specifics for the endpoint. There may be many
endpoints in a device and endpoints may be shared in
different configurations.
21.9.6.5
Many of the previous descriptors reference one or
more string descriptors. String descriptors provide
human
(Section 21.9.1
describe. Often these strings show up in the host to
help the user identify the device. String descriptors are
generally optional to save memory and are encoded in
a unicode format.
21.9.7
Each USB device must indicate its bus presence and
speed to the host. This is accomplished through a
1.5 kΩ resistor, which is connected to the bus at the
time of the attachment event.
Depending on the speed of the device, the resistor
either pulls up the D+ or D- line to 3.3V. For a
low-speed device, the pull-up resistor is connected to
the D- line. For a full-speed device, the pull-up resistor
is connected to the D+ line.
21.9.8
USB specifications include class specifications, which
operating
Examples of classes include Audio, Mass Storage,
Communications and Human Interface (HID). In most
cases, a driver is required at the host side to ‘talk’ to the
USB device. In custom applications, a driver may need
to be developed. Fortunately, drivers are available for
most common host systems for the most common
classes of devices. Thus, these drivers can be reused.
readable
BUS SPEED
CLASS SPECIFICATIONS AND
DRIVERS
system
Configuration Descriptor
Interface Descriptor
Endpoint Descriptor
String Descriptor
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DS39931C-page 377
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