- Components/
- Integrated Circuits (ICs)/
- Embedded - Microcontrollers/
PIC16C74-04/L
PIC16C74-04/L | |
|---|---|
| Manufacturer Part Number | PIC16C74-04/L |
| Description | MICRO CTRL 4K 4MHZ OTP 44PLCC |
| Manufacturer | Microchip Technology |
| Series | PIC® 16C |
| PIC16C74-04/L datasheets |
|
Availability: By request
International delivery:
Warranty: 60 days
×
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Specifications of PIC16C74-04/L | |||
|---|---|---|---|
| Core Processor | PIC | Core Size | 8-Bit |
| Speed | 4MHz | Connectivity | I²C, SPI, UART/USART |
| Peripherals | POR, PWM, WDT | Number Of I /o | 33 |
| Program Memory Size | 7KB (4K x 14) | Program Memory Type | OTP |
| Ram Size | 192 x 8 | Voltage - Supply (vcc/vdd) | 4 V ~ 6 V |
| Data Converters | A/D 8x8b | Oscillator Type | External |
| Operating Temperature | 0°C ~ 70°C | Package / Case | 44-PLCC |
| For Use With | DVA16XL441 - ADAPTER DEVICE ICE 44PLCC | Lead Free Status / RoHS Status | Request inventory verification / Request inventory verification |
| Eeprom Size | - | ||
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PrevNext
13.4.1
FASTER CONVERSION - LOWER
RESOLUTION TRADE-OFF
Not all applications require a result with 8-bits of reso-
lution, but may instead require a faster conversion time.
The A/D module allows users to make the trade-off of
conversion speed to resolution. Regardless of the res-
olution 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 electri-
cal specification). Once the T
time violates the mini-
AD
mum specified time, all the following A/D result bits are
not valid (see A/D Conversion 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 determine
the time before the oscillator can be switched is as fol-
lows:
Conversion time = 2T
+ N • T
AD
AD
Where: N = number of bits of resolution required.
EXAMPLE 13-3: 4-BIT vs. 8-BIT CONVERSION TIMES
T
AD
T
OSC
2T
+ N • T
+ (8 - N)(2T
)
AD
AD
OSC
Note 1: PIC16C7X devices have a minimum T
1997 Microchip Technology Inc.
Since the T
AD
user must use some method (a timer, software loop,
etc.) to determine when the A/D oscillator may be
changed. Example 13-3 shows a comparison of time
required for a conversion with 4-bits of resolution, ver-
sus the 8-bit resolution conversion. The example is for
devices operating at 20 MHz and 16 MHz (The A/D
clock is programmed for 32T
immediately after 6T
time violates
AD
for 2T
.
OSC
The 2T
violates the minimum T
OSC
4-bits will not be converted to correct values.
+ (8 - N)(2T
)
OSC
Freq. (MHz)
20
16
20
16
20
16
time of 1.6 s.
AD
PIC16C7X
is based from the device oscillator, the
), and assumes that
OSC
, the A/D clock is programmed
AD
time since the last
AD
Resolution
(1)
4-bit
8-bit
1.6 s
1.6 s
2.0 s
2.0 s
50 ns
50 ns
62.5 ns
62.5 ns
10 s
16 s
12.5 s
20 s
DS30390E-page 123
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