PIC17C752 MICROCHIP [Microchip Technology], PIC17C752 Datasheet - Page 171
![no-image](/images/no-image-200.jpg)
PIC17C752
Manufacturer Part Number
PIC17C752
Description
High-Performance 8-Bit CMOS EPROM Microcontrollers
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC17C752.pdf
(320 pages)
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EXAMPLE 16-1: CALCULATING THE
T
† Only required for temperatures
T
T
T
TABLE 16-1:
TABLE 16-2:
Operation
8T
32T
64T
RC
Legend: Shaded cells are are outside of recommended ranges.
Note 1: The RC source has a typical T
Operation
8T
32T
64T
RC
Legend: Shaded cells are are outside of recommended ranges.
Note 1: The RC source has a typical T
ACQ
ACQ
CAP
ACQ
1997 Microchip Technology Inc.
OSC
OSC
OSC
OSC
OSC
OSC
= -C
= 10 s + Tcap + [(Temp - 25 C)(0.05 s/ C)]
= 10 s + 27.447 s + [(50 C - 25 C)(0.05 s/ C)]
= Amplifier Settling Time +
2: These values violate the minimum required T
3: For faster conversion times, the selection of another clock source is recommended.
4: When the device frequencies is greater than 1 MHz, the RC A/D conversion clock source is only recom-
2: These values violate the minimum required T
3: For faster conversion times, the selection of another clock source is recommended.
4: When the device frequencies is greater than 1 MHz, the RC A/D conversion clock source is only recom-
AD Clock Source (T
AD Clock Source (T
Holding Capacitor Charging Time +
Temperature Coefficient †
-200 pF (1 k + 7 k + 10 k ) ln(0.0004885)
-200 pF (18 k ) ln(0.0004885)
-3.6 s (-7.6241)
27.447 s
37.447 s + 1.25 s
38.697 s
mended for sleep operation.
mended for sleep operation.
HOLD
(R
T
T
IC
ADCS1:ADCS0
ADCS1:ADCS0
AD
AD
MINIMUM REQUIRED
ACQUISITION TIME
+ R
vs. DEVICE OPERATING FREQUENCIES (EXTENDED VOLTAGE DEVICES (LC))
vs. DEVICE OPERATING FREQUENCIES (STANDARD DEVICES (C))
SS
00
01
10
11
00
01
10
11
+ R
AD
AD
)
)
S
) ln(1/2047)
25 C
2 - 6 s
3 - 9 s
AD
AD
242 ns
970 ns
1.0 s
33 MHz
1.94 s
8 MHz
4.0 s
8.0 s
time of 4 s.
time of 4 s.
(1, 4)
(1, 4)
(2)
(2)
(2)
Preliminary
AD
AD
2 - 6 s
3 - 9 s
time.
time.
400 ns
2.0 s
20 MHz
1.6 s
3.2 s
4 MHz
16 s
8 s
16.2
The A/D conversion time per bit is defined as T
A/D conversion requires a minimum 12T
conversion. The source of the A/D conversion clock is
software selected. The four possible options for T
are:
For correct A/D conversions, the A/D conversion clock
(T
of 1.6 s.
Table 16-1 and Table 16-2 show the resultant T
times derived from the device operating frequencies
and the A/D clock source selected. These times are for
standard voltage range devices.
(1, 4)
(1, 4)
(2)
(2)
AD
Device Frequency
Device Frequency
• 8T
• 32T
• 64T
• Internal RC oscillator
) must be selected to ensure a minimum T
Selecting the A/D Conversion Clock
2 - 6 s
3 - 9 s
OSC
12.8 s
OSC
OSC
32 s
5 MHz
2 MHz
1.6 s
6.4 s
16 s
4 s
(1, 4)
(3)
(1, 4)
(3)
2 - 6 s
3 - 9 s
1.25 MHz
25.6 s
51.2 s
32 s
64 s
1 MHz
6.4 s
8 s
(1, 4)
(3)
(3)
(3)
(3)
(1)
DS30264A-page 171
333.33 kHz
333.33 kHz
AD
2 - 6 s
3 - 9 s
192 s
192 s
96 s
96 s
24 s
24 s
per 10-bit
AD
AD
(3)
(3)
(3)
(3)
(1)
(1)
. The
time
AD
AD
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