PIC16C73A-04/SP Microchip Technology Inc., PIC16C73A-04/SP Datasheet - Page 123
PIC16C73A-04/SP
Manufacturer Part Number
PIC16C73A-04/SP
Description
28 PIN, 7 KB OTP, 192 RAM, 22 I/O
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC16C73A-04SP.pdf
(289 pages)
Specifications of PIC16C73A-04/SP
A/d Inputs
5-Channel, 8-Bit
Cpu Speed
5 MIPS
Eeprom Memory
0 Bytes
Input Output
22
Interface
I2C/SPI/USART
Memory Type
OTP
Number Of Bits
8
Package Type
28-pin SPDIP
Programmable Memory
7K Bytes
Ram Size
192 Bytes
Speed
4 MHz
Timers
2-8-bit, 1-16-bit
Voltage, Range
2.5-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
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13.4.1
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
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:
EXAMPLE 13-3: 4-BIT vs. 8-BIT CONVERSION TIMES
Note 1: PIC16C7X devices have a minimum T
T
T
2T
1997 Microchip Technology Inc.
AD
OSC
Conversion time = 2T
Where: N = number of bits of resolution required.
AD
+ N • T
FASTER CONVERSION - LOWER
RESOLUTION TRADE-OFF
AD
+ (8 - N)(2T
AD
+ N • T
OSC
AD
)
time violates the mini-
AD
+ (8 - N)(2T
AD
time violates
AD
OSC
time of 1.6 s.
)
Since the T
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
for 2T
The 2T
4-bits will not be converted to correct values.
Freq. (MHz)
OSC
OSC
20
16
20
16
20
16
.
violates the minimum T
AD
(1)
is based from the device oscillator, the
AD
12.5 s
62.5 ns
1.6 s
2.0 s
50 ns
10 s
, the A/D clock is programmed
4-bit
PIC16C7X
OSC
Resolution
), and assumes that
AD
DS30390E-page 123
time since the last
62.5 ns
1.6 s
2.0 s
50 ns
16 s
20 s
8-bit
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