PIC16F874-04/PQ Microchip Technology, PIC16F874-04/PQ Datasheet - Page 415
![IC MCU FLASH 4KX14 EE 44MQFP](/photos/6/59/65984/150-44-pqfp_sml.jpg)
PIC16F874-04/PQ
Manufacturer Part Number
PIC16F874-04/PQ
Description
IC MCU FLASH 4KX14 EE 44MQFP
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 PIC16F874-04/PQ
Core Size
8-Bit
Program Memory Size
7KB (4K x 14)
Oscillator Type
External
Core Processor
PIC
Speed
4MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
33
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
Operating Temperature
0°C ~ 70°C
Package / Case
44-MQFP, 44-PQFP
Controller Family/series
PIC16F
No. Of I/o's
33
Eeprom Memory Size
128Byte
Ram Memory Size
192Byte
Cpu Speed
4MHz
Processor Series
PIC16F
Core
PIC
Data Bus Width
8 bit
Data Ram Size
192 B
Interface Type
MSSP, PSP, USART
Maximum Clock Frequency
20 MHz
Number Of Programmable I/os
33
Number Of Timers
3 bit
Operating Supply Voltage
2 V to 5.5 V
Maximum Operating Temperature
+ 70 C
Mounting Style
SMD/SMT
3rd Party Development Tools
52715-96, 52716-328, 52717-734
Development Tools By Supplier
PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, DM163022, DV164120
Minimum Operating Temperature
0 C
On-chip Adc
8
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC16F874-04/PQ
Manufacturer:
MICROCHIP
Quantity:
9 100
Company:
Part Number:
PIC16F874-04/PQ
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: 415 of 688
- Download datasheet (3Mb)
22.6.1
1997 Microchip Technology Inc.
Faster Conversion - Lower Resolution Trade-off
Section 22. Basic 8-bit A/D Converter
Not all applications require a result with 8-bits of resolution, but may instead require a faster con-
version time. The A/D module allows users to make the trade-off of conversion speed to resolu-
tion. Regardless of the resolution required, the acquisition time is the same. To speed up the
conversion, the clock source of the A/D module may be switched so that the T
the minimum specified time (see the applicable electrical specification). Once the T
lates the minimum specified time, all the following A/D result bits are not valid (see A/D Conver-
sion Timing in the Electrical Specifications section.) The clock sources may only be switched
between the three oscillator versions (cannot be switched from/to RC). The equation to deter-
mine the time before the oscillator can be switched is as follows:
Since the T
ware loop, etc.) to determine when the A/D oscillator may be changed.
comparison of time required for a conversion with 4-bits of resolution, versus the 8-bit resolution
conversion. The example is for devices operating at 20 MHz and 16 MHz (The A/D clock is pro-
grammed for 32T
for 2T
The 2T
values.
Example 22-3:
Note 1: The PIC16C71 has a minimum T
T
T
T
AD
OSC
AD
Conversion time = T
Where:
OSC
+ N • T
2: If the full 8-bit conversion is required, the A/D clock source should not be changed.
OSC
.
All other devices have a minimum T
AD
violates the minimum T
AD
is based from the device oscillator, the user must use some method (a timer, soft-
+ (10 - N)(2T
OSC
4-bit vs. 8-bit Conversion Times
N = number of bits of resolution required.
), and assumes that immediately after 5T
AD
+ N • T
OSC
)
AD
AD
+ (10 - N)(2T
time since the last 4-bits will not be converted to correct
AD
(MHz)
AD
time of 2.0 s.
Freq.
20
16
20
16
20
16
time of 1.6 s.
(1)
OSC
)
10.75 s
AD
62.5 ns
1.6 s
2.0 s
8.6 s
50 ns
4-bit
, the A/D clock is programmed
Resolution
Example 22-3
DS31022A-page 22-13
AD
62.5 ns
17.6 s
time violates
1.6 s
2.0 s
50 ns
22 s
8-bit
AD
time vio-
shows a
22
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