PIC16F1937-I/P Microchip Technology, PIC16F1937-I/P Datasheet - Page 5

• Manufacturer Part Number: PIC16F1937-I/P
• Description: IC PIC MCU FLASH 512KX14 40-PDIP
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 16Fr

Specifications of PIC16F1937-I/P

• Program Memory Type: FLASH
• Program Memory Size: 14KB (8K x 14)
• Package / Case: 40-DIP (0.600", 15.24mm)
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 32MHz
• Connectivity: I²C, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 36
• Eeprom Size: 256 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 14x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 512 B
• Interface Type: EUSART/MI2C/SPI
• Maximum Clock Frequency: 32 MHz
• Number Of Programmable I/os: 36
• Number Of Timers: 5
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 14-ch x 10-bit
• A/d Bit Size: 10 bit
• A/d Channels Available: 14
• Height: 4.95 mm
• Length: 53.21 mm
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 1.8 V
• Width: 14.73 mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

5. Module: ADC
5.1 Analog-to-Digital Conversion
1.
2.
FIGURE 1:
 2010 Microchip Technology Inc.
F
T
T
See the ADC Clock Period (T
chapter of the device data sheet.
An ADC conversion may not complete under these
conditions:
When F
clock source used for the ADC converter.
The ADC is operating from its dedicated internal
FRC oscillator and the device is not in Sleep
mode (any F
When this occurs, the ADC Interrupt Flag (ADIF)
does not get set, the GO/DONE bit does not get
cleared, and the conversion result does not get
loaded into the ADRESH and ADRESL result
registers.
Work around
In
required to complete the full conversion. Each T
cycle consists of 8 T
provided to stop the A/D conversion after 86
instruction cycles and terminate the conversion at
the correct time as shown in the figure above.
CY
AD
OSC
Figure
= 4/32 MHz = 125 nsec
= 1 µsec, ADCS = F
PIC16F1934/1936/1937 and PIC16LF1934/1936/1937
= 32 MHz
Method 1: Select the system clock, F
Method 2: Select
4 T
OSC
8 T
1 T
1, 88 instruction cycles (T
CY
CY
is greater than 8 MHz and it is the
OSC
AD
INSTRUCTION CYCLE DELAY CALCULATION EXAMPLE
the ADC clock source and reduce
the F
less
conversions.
oscillator as the ADC conversion
clock source and perform all
conversions with the device in
Sleep.
frequency).
CY
OSC
when
OSC
periods. A fixed delay is
the
frequency to 8 MHz or
/32
AD
performing
) vs. Device Operating Frequencies table, in the Analog-to-Digital Converter
88 T
dedicated
11 T
84 T
CY
CY
AD
CY
) will be
OSC
ADC
FRC
, as
AD
Method 3: This method is provided if the
application cannot use Sleep
mode and requires continuous
operation at frequencies above 8
MHz. This method requires early
termination of an ADC conver-
sion. Provide a fixed time delay in
software to stop the A-to-D
conversion manually, after all 10
bits are converted, but before the
conversion
automatically. The conversion is
stopped by clearing the GO/
DONE bit in software. The GO/
DONE bit must be cleared during
the last ½ T
conversion
completed automatically. Refer to
Figure 1
Stop the A/D conversion
between 10.5 and 11 T
cycles.
See the Analog-to-Digital
Conversion Timing diagram
in
Converter chapter of the
device data sheet.
the
for details.
AD
Analog-to-Digital
would
cycle, before the
DS80479F-page 5
would
complete
AD
have