PIC18LF14K50-I/SS Microchip Technology, PIC18LF14K50-I/SS Datasheet - Page 243

• Manufacturer Part Number: PIC18LF14K50-I/SS
• Description: IC PIC MCU FLASH 16K 1.8V 20SSOP
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 18Fr

Specifications of PIC18LF14K50-I/SS

• Core Size: 8-Bit
• Program Memory Size: 16KB (8K x 16)
• Core Processor: PIC
• Speed: 48MHz
• Connectivity: I²C, SPI, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 14
• 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 11x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-SSOP
• Controller Family/series: PIC18
• No. Of I/o's: 15
• Eeprom Memory Size: 256Byte
• Ram Memory Size: 768Byte
• Cpu Speed: 48MHz
• No. Of Timers: 4
• Processor Series: PIC18LF
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: EUSART, I2C, MSSP, SPI, USB
• Maximum Clock Frequency: 32 KHz
• Number Of Programmable I/os: 18
• Number Of Timers: 4
• Operating Supply Voltage: 1.8 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, DM164127, DV164126
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 12 Channel
• Package: 20SSOP
• Device Core: PIC
• Family Name: PIC18
• Maximum Speed: 48 MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

21.0
There are two independent voltage references
available:
• Programmable Voltage Reference
• 1.024V Fixed Voltage Reference
21.1
The Voltage Reference module provides an internally
generated voltage reference for the comparators and
the DAC module. The following features are available:
• Independent from Comparator operation
• Single 32-level voltage ranges
• Output clamped to V
• Ratiometric with V
• 1.024V Fixed Reference Voltage (FVR)
The REFCON1 register (Register 21-2) controls the
Voltage Reference module shown in Figure 21-1.
21.1.1
The
comparator configuration. Setting the D1EN bit of the
REFCON1 register will enable the voltage reference by
allowing current to flow in the V
When the D1EN bit is cleared, current flow in the V
voltage divider is disabled minimizing the power drain
of the voltage reference peripheral.
21.1.2
The
ranges. The 32 levels are set with the DAC1R<4:0>
bits of the REFCON2 register.
The V
equations:
EQUATION 21-1:
21.1.3
The V
power consumption by setting the D1EN bit of the
REFCON1 register to ‘0’: This allows the comparator to
detect a zero-crossing while not consuming additional
V
© 2009 Microchip Technology Inc.
V
REF
OUT
V
V
SOURCE
SOURCE
V
module current.
voltage
REF
REF
= (V
REF
+ V
VOLTAGE REFERENCES
Voltage Reference
SOURCE
output voltage is determined by the following
+ = V
- = V
output voltage can be set to Vss with no
INDEPENDENT OPERATION
OUTPUT VOLTAGE SELECTION
OUTPUT CLAMPED TO V
SOURCE
voltage reference has 32 voltage level
SS
reference
DD
+ - V
, or V
, V
-
DD
REF
V
SS
SOURCE
REF
REF
+, or FVR
-
is
OUTPUT VOLTAGE
-)*(DAC1R<4:0>/(2^5))
independent
REF
voltage divider.
PIC18F1XK50/PIC18LF1XK50
SS
of
REF
Preliminary
the
21.1.4
The comparator voltage reference is V
therefore, the V
V
Voltage Reference can be found in Section 27.0
“Electrical Specifications”.
21.1.5
The V
CV
register to ‘1’. Selecting the reference voltage for out-
put on the V
output buffer and digital input threshold detector func-
tions of that pin. Reading the CV
been configured for reference voltage output will
always return a ‘0’.
Due to the limited current drive capability, a buffer must
be used on the voltage reference output for external
connections to CV
buffering technique.
21.1.6
When the device wakes up from Sleep through an
interrupt or a Watchdog Timer time-out, the contents of
the RECON1 register are not affected. To minimize
current consumption in Sleep mode, the voltage
reference should be disabled.
21.1.7
A device Reset affects the following:
• Voltage reference is disabled
• Fixed voltage reference is disabled
• V
• The DAC1R<4:0> range select bits are cleared
21.2
The FVR reference is a stable fixed voltage reference,
independent of V
1.024V. This reference can be enabled by setting the
FVR1EN bit of the REFCON0 register to ‘1’. The FVR
voltage reference can be routed to the comparators or
an ADC input channel.
21.2.1
When the Fixed Voltage Reference module is enabled, it
will require some time for the reference and its amplifier
circuits to stabilize. The user program must include a
small delay routine to allow the module to settle. The
FVR1ST stable bit of the REFCON0 register also
indicates that the FVR reference has been operating long
enough to be stable. See Section 27.0 “Electrical
Specifications” for the minimum delay requirement.
DD
REF
REF
. The tested absolute accuracy of the Comparator
REF
pin by setting the DAC1OE bit of the REFCON1
is removed from the CV
FVR Reference Module
voltage reference can be output to the device
OUTPUT RATIOMETRIC TO V
VOLTAGE REFERENCE OUTPUT
OPERATION DURING SLEEP
EFFECTS OF A RESET
FVR STABILIZATION PERIOD
REF
REF
pin automatically overrides the digital
DD
REF
output changes with fluctuations in
, with a nominal output voltage of
. Figure 21-2 shows an example
REF
REF
DS41350C-page 241
pin
pin when it has
DD
derived and
DD