PIC16F874-04E/L Microchip Technology, PIC16F874-04E/L Datasheet - Page 455
![IC MCU FLASH 4KX14 EE 44PLCC](/photos/6/63/66325/150-44-plcc_sml.jpg)
PIC16F874-04E/L
Manufacturer Part Number
PIC16F874-04E/L
Description
IC MCU FLASH 4KX14 EE 44PLCC
Manufacturer
Microchip Technology
Series
PIC® 16Fr
Datasheets
1.PIC16F616T-ISL.pdf
(8 pages)
2.PIC16F688T-ISL.pdf
(688 pages)
3.PIC16F873-04SO.pdf
(218 pages)
4.PIC16F873-04SO.pdf
(5 pages)
5.PIC16F873-04SO.pdf
(5 pages)
Specifications of PIC16F874-04E/L
Core Processor
PIC
Core Size
8-Bit
Speed
4MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
33
Program Memory Size
7KB (4K x 14)
Program Memory Type
FLASH
Eeprom Size
128 x 8
Ram Size
192 x 8
Voltage - Supply (vcc/vdd)
4 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
External
Operating Temperature
-40°C ~ 125°C
Package / Case
44-PLCC
For Use With
309-1040 - ADAPTER 44-PLCC ZIF TO 40-DIP309-1039 - ADAPTER 44-PLCC TO 40-DIP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
PIC16F87404E/L
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC16F874-04E/L
Manufacturer:
Microchip Technology
Quantity:
10 000
- PIC16F616T-ISL PDF datasheet
- PIC16F688T-ISL PDF datasheet #2
- PIC16F873-04SO PDF datasheet #3
- PIC16F873-04SO PDF datasheet #4
- PIC16F873-04SO PDF datasheet #5
- Current page: 455 of 688
- Download datasheet (3Mb)
24.5
24.5.1
24.5.2
24.5.3
24.5.3.1
24.5.3.2
1997 Microchip Technology Inc.
Using Calibration Data
Parameter Variation
Device Programming
Non-Windowed Parts
Windowed Parts
Calibration Parameters
The Slope A/D module has several analog components. Like all CMOS circuitry the parametric
values vary with process, temperature, voltage, and time. Devices have been designed to mini-
mize the effect of these variations. In addition, each device, with the slope A/D module, is cali-
brated at factory test by measuring several key parameters and storing these values into EPROM
at specified locations. The customer’s application program may access this data and use it to
mathematically compensate for device variations.
Collectively, these data values are referred to as calibration constants. The calibration constants
are listed in
bytes of mantissa. For information on floating point algorithms, refer to AN575.
Table 24-3: Calibration Constants
For additional information on using the calibration parameters see Application Note 624.
The calibration constants should be used by the application firmware to obtain the best accuracy.
K
Table 24-4
used as well as the “Expected Parameter Variation with Calibration.”
If the accuracies without calibration are adequate for the task at hand, no further calibrations of
the module are necessary. If greater accuracy is needed, the calibration constants must be used.
Table 24-4: Parameter Variation
Non-windowed parts are programmed just like any PIC16CXXX processor. The calibration area
is write-protected during factory calibration.
Calibration data must be read out and saved before erasing a windowed part. There is no way to
recreate these values, so if they are lost the part can no longer be calibrated.
A/D Slope reference ratio
Bandgap reference voltage
K
K
Symbol
REF
Caution:
Windowed parts must not be write-protected. If the parts are erased by ultraviolet light, the
calibration parameters are lost and cannot be reprogrammed once the part has been
write-protected.
REF
BG
and K
A/D slope reference ratio
Bandgap reference voltage
lists the “Maximum Parameter Variation” attainable when the calibration data is not
BG
Table
Parameter
are used in A/D conversions.
24-3. The 32-bit floating point representation has an exponent byte, and three
Parameter
Section 24. Slope A/D
Symbol
K
K
REF
BG
+/- 2.2%
+/- 4.2%
Without Calibration
Maximum Variation
Number of
Bytes
4
4
+/- 0.13%
+/- 0.058%
Achievable Variation
32-bit Floating Point
32-bit Floating Point
Representation of
with Calibration
DS31024A-page 24-13
Value
24
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