PIC18F2431-I/SO Microchip Technology, PIC18F2431-I/SO Datasheet - Page 257

• Manufacturer Part Number: PIC18F2431-I/SO
• Description: IC PIC MCU FLASH 8KX16 28SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F2431-I/SO

• Program Memory Type: FLASH
• Program Memory Size: 16KB (8K x 16)
• Package / Case: 28-SOIC (7.5mm Width)
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, Power Control PWM, QEI, POR, PWM, WDT
• Number Of I /o: 24
• Eeprom Size: 256 x 8
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 5x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC18F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 768 B
• Interface Type: EUSART/I2C/SPI/SSP
• Maximum Clock Frequency: 40 MHz
• Number Of Programmable I/os: 24
• Number Of Timers: 4
• Operating Supply Voltage: 2 V to 5.5 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, ICE2000, ICE4000, DM183021, DV164136
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 5-ch x 10-bit
• Package: 28SOIC W
• Device Core: PIC
• Family Name: PIC18
• Maximum Speed: 40 MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: XLT28SO-1 - SOCKET TRANSITION 28SOIC 300MILI3-DB18F4431 - BOARD DAUGHTER ICEPIC3
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

22.0
PIC18F2331/2431/4331/4431 devices have a Low-
Voltage Detect module (LVD), a programmable circuit
that enables the user to specify a device voltage trip
point. If the device experiences an excursion below the
trip point, an interrupt flag is set. If the interrupt is
enabled, the program execution will branch to the inter-
rupt vector address and the software can then respond
to the interrupt.
The Low-Voltage Detect Control register
completely controls the operation of the LVD module.
This allows the circuitry to be “turned off” by the user
under software control, which minimizes the current
consumption for the device.
REGISTER 22-1:
 2010 Microchip Technology Inc.
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 7-6
bit 5
bit 4
bit 3-0
Note 1:
U-0
—
LOW-VOLTAGE DETECT (LVD)
LVDL<3:0> bit modes, which result in a trip point below the valid operating voltage of the device, are not
tested.
Unimplemented: Read as ‘0’
IRVST: Internal Reference Voltage Stable Flag bit
1 = Indicates that the Low-Voltage Detect logic will generate the interrupt flag at the specified voltage
0 = Indicates that the Low-Voltage Detect logic will not generate the interrupt flag at the specified
LVDEN: Low-Voltage Detect Power Enable bit
1 = Enables LVD, powers up LVD circuit
0 = Disables LVD, powers down LVD circuit
LVDL<3:0>: Low-Voltage Detection Limit bits
1111 = External analog input is used (input comes from the LVDIN pin)
1110 = Maximum setting
.
.
.
0010 = Minimum setting
0001 = Reserved
0000 = Reserved
range
voltage range and the LVD interrupt should not be enabled
U-0
—
LVDCON: LOW-VOLTAGE DETECT CONTROL REGISTER
W = Writable bit
‘1’ = Bit is set
IRVST
R-0
(Register
PIC18F2331/2431/4331/4431
LVDEN
R/W-0
22-1)
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
(1)
LVDL3
R/W-0
The block diagram for the LVD module is shown in
Figure
The module is enabled by setting the LVDEN bit, but
the circuitry requires some time to stabilize each time
that it is enabled. The IRVST bit is a read-only bit used
to indicate when the circuit is stable. The module can
only generate an interrupt after the circuit is stable and
the IRVST bit is set. The module monitors for drops in
V
DD
below a predetermined set point.
(1)
22-1.
LVDL2
R/W-1
(1)
x = Bit is unknown
LVDL1
R/W-0
(1)
DS39616D-page 257
LVDL0
R/W-1
(1)
bit 0