MCP1726T-ADJZEMF Microchip Technology, MCP1726T-ADJZEMF Datasheet - Page 22

• Manufacturer Part Number: MCP1726T-ADJZEMF
• Description: Regulator, Extended Industrial, HVSON, 8-Pin|
• Manufacturer: Microchip Technology

PIC12F683
FIGURE 3-2:
TABLE 3-2:
3.3
The EC Oscillator mode requires an external clock
source to be connected to the OSC1 pin. There is no
oscillator start-up time required after a Power-on
Reset, or after an exit from Sleep mode.
In the EC Oscillator mode, the OSC2 pin becomes an
additional general purpose I/O pin. The I/O pin
becomes bit 4 of GPIO (GP4). Figure 3-3 shows the pin
connections for the EC Oscillator mode.
FIGURE 3-3:
DS41211A-page 20
Capacitor values are for design guidance only.
Different capacitor values may be required to produce
acceptable oscillator operation. The user should test
the performance of the oscillator over the expected
V
DD
Mode
Clock from
Ext. System
Note 1: See Table 3-2 for typical values of C1 and
HS
XT
and temperature range for the application.
C1
C2
External Clock Input
2: A series resistor (R
3: R
(1)
(1)
Typical Capacitor Values Used:
C2.
(typically between 2 M
16.0 MHz
2.0 MHz
4.0 MHz
8.0 MHz
455 kHz
F
GP4
RES
R
Freq
S
(2)
varies with the resonator chosen
CERAMIC RESONATORS
(FOR DESIGN GUIDANCE
ONLY)
OSC1
OSC2
CERAMIC RESONATOR
OPERATION (HS OR XT
OSC. CONFIGURATION)
EXTERNAL CLOCK INPUT
OPERATION
(EC CONFIGURATION)
OSC1/CLKIN
I/O (OSC2)
R
OSC1
F (3)
S
56 pF
47 pF
33 pF
27 pF
22 pF
) may be required.
PIC12F683
to 10 M
PIC12F683
To Internal
Logic
Sleep
Advance Information
.
OSC2
56 pF
47 pF
33 pF
27 pF
22 pF
3.4
For timing insensitive applications, the “RC” and
“RCIO” device options offer additional cost savings.
The RC oscillator frequency is a function of the supply
voltage, the resistor (R
values and the operating temperature. In addition to
this, the oscillator frequency will vary from unit to unit
due to normal manufacturing variation. Furthermore,
the difference in lead frame capacitance between pack-
age types will also affect the oscillation frequency,
especially for low C
take into account variation due to tolerance of external
R and C components used. Figure 3-4 shows how the
R/C combination is connected.
In the RC Oscillator mode, the oscillator frequency
divided by 4 is available on the OSC2 pin. This signal may
be used for test purposes or to synchronize other logic.
FIGURE 3-4:
The RCIO Oscillator mode (Figure 3-5) functions like
the RC mode, except that the OSC2 pin becomes an
additional general purpose I/O pin. The I/O pin
becomes bit 4 of GPIO (GP4).
FIGURE 3-5:
C
C
V
Recommended values: 3 k
V
R
Recommended values: 3 k
R
EXT
EXT
SS
SS
EXT
EXT
V
V
DD
DD
RC Oscillator
GP4
F
OSC
EXT
/4
RC OSCILLATOR MODE
OSC1
RCIO OSCILLATOR MODE
OSC1
OSC2/CLKOUT
I/O (OSC2)
C
values. The user also needs to
C
 2003 Microchip Technology Inc.
EXT
EXT
EXT
> 20 pF
> 20 pF
) and capacitor (C
R
R
EXT
EXT
PIC12F683
PIC12F683
100 k
100 k
Internal
Internal
Clock
Clock
EXT
)