PIC18F67K22-I/MR Microchip Technology, PIC18F67K22-I/MR Datasheet - Page 383

• Manufacturer Part Number: PIC18F67K22-I/MR
• Description: 128kB Flash, 4kB RAM, 1kB EE, NanoWatt XLP, GP 64 QFN 9x9x0.9mm TUBE
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 18Fr

Specifications of PIC18F67K22-I/MR

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 64MHz
• Connectivity: I²C, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Number Of I /o: 53
• Program Memory Size: 128KB (64K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 16x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-VFQFN Exposed Pad
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

FIGURE 26-3:
26.5
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 Interrupt
Service Routine (ISR), which would allow the applica-
tion to perform “housekeeping tasks” and a controlled
shutdown before the device voltage exits the valid
operating range at T
a time window, represented by the difference between
T
 2009-2011 Microchip Technology Inc.
A
A
, the HLVD logic generates an interrupt at time, T
and T
CASE 1:
CASE 2:
Enable HLVD
B
Enable HLVD
Applications
, to safely exit.
HLVDIF
HLVDIF
IRVST
IRVST
V
V
DD
DD
B
. This would give the application
HIGH-VOLTAGE DETECT OPERATION (VDIRMAG =
HLVDIF may not be Set
Internal Reference is Stable
Figure 26-4
shows a
Internal Reference is Stable
T
T
IRVST
IRVST
A
.
PIC18F87K22 FAMILY
HLVDIF Cleared in Software,
HLVDIF Remains Set since HLVD Condition still Exists
FIGURE 26-4:
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
operating voltage
Time
HLVDIF Cleared in Software
T
A
V
V
DS39960D-page 383
HLVD
HLVD
T
B