PIC18LF24K22-I/SS Microchip Technology, PIC18LF24K22-I/SS Datasheet - Page 346

• Manufacturer Part Number: PIC18LF24K22-I/SS
• Description: IC PIC MCU 16KB FLASH 28SSOP
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 18Fr

Specifications of PIC18LF24K22-I/SS

• Core Size: 8-Bit
• Program Memory Size: 16KB (8K x 16)
• Core Processor: PIC
• Speed: 64MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, HLVD, POR, PWM, WDT
• Number Of I /o: 24
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.6 V
• Data Converters: A/D 19x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-SSOP (0.200", 5.30mm Width)
• Controller Family/series: PIC18
• No. Of I/o's: 25
• Eeprom Memory Size: 256Byte
• Ram Memory Size: 768Byte
• Cpu Speed: 64MHz
• No. Of Timers: 7
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PIC18(L)F2X/4XK22
FIGURE 23-3:
23.5
In many applications, it is desirable to detect a drop
below, or rise above, a particular voltage threshold. For
example, the HLVD module could be periodically
enabled to detect Universal Serial Bus (USB) attach or
detach. This assumes the device is powered by a lower
voltage source than the USB when detached. An attach
would indicate a high-voltage detect from, for example,
3.3V to 5V (the voltage on USB) and vice versa for a
detach. This feature could save a design a few extra
components and an attach signal (input pin).
For general battery applications,
possible voltage curve. Over time, the device voltage
decreases. When the device voltage reaches voltage
V
The interrupt could cause the execution of an ISR,
which would allow the application to perform “house-
keeping tasks” and a controlled shutdown before the
device voltage exits the valid operating range at T
This would give the application a time window,
represented by the difference between T
safely exit.
DS41412D-page 346
A
, the HLVD logic generates an interrupt at time, T
CASE 1:
CASE 2:
Enable HLVD
Enable HLVD
Applications
HLVDIF
HLVDIF
IRVST
IRVST
V
V
DD
DD
HIGH-VOLTAGE DETECT OPERATION (VDIRMAG =
HLVDIF may not be set
Internal Reference is stable
Figure 23-4
A
and T
shows a
Internal Reference is stable
B
Preliminary
, to
T
T
IRVST
IRVST
A
B
.
.
HLVDIF cleared in software,
HLVDIF remains set since HLVD condition still exists
FIGURE 23-4:
V
V
A
B
Legend:
HLVDIF cleared in software
V
V
A
B
1
= HLVD trip point
= Minimum valid device
)
TYPICAL LOW-VOLTAGE
DETECT APPLICATION
 2010 Microchip Technology Inc.
operating voltage
Time
HLVDIF cleared in software
T
A
V
V
HLVD
HLVD
T
B