PIC14000T-20I/SO Microchip Technology, PIC14000T-20I/SO Datasheet - Page 77
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PIC14000T-20I/SO
Manufacturer Part Number
PIC14000T-20I/SO
Description
IC MCU OTP 4KX14 A/D 28SOIC
Manufacturer
Microchip Technology
Series
PIC® 14r
Datasheets
1.PIC16LF627A-IP.pdf
(8 pages)
2.PIC16F818-ISO.pdf
(6 pages)
3.PIC14000-04SO.pdf
(153 pages)
4.PIC14000-04SO.pdf
(5 pages)
Specifications of PIC14000T-20I/SO
Core Processor
PIC
Core Size
8-Bit
Speed
20MHz
Connectivity
I²C
Peripherals
POR, Temp Sensor, WDT
Number Of I /o
20
Program Memory Size
7KB (4K x 14)
Program Memory Type
OTP
Ram Size
192 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 6 V
Data Converters
Slope A/D
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
28-SOIC (7.5mm Width)
Data Bus Width
8 bit
Data Ram Size
192 B
Interface Type
SPI, UART
Maximum Clock Frequency
20 MHz
Number Of Programmable I/os
22
Number Of Timers
1
Operating Supply Voltage
2.7 V to 6 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
On-chip Adc
14 bit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Details
10.2.2
In HS mode, a crystal or ceramic resonator is con-
nected to the OSC1 and OSC2 pins to establish oscil-
lation. A parallel cut crystal is required. Use of a series
cut crystal may give a frequency outside of the crystal
manufacturer’s specifications. When in HS mode, the
device can have an external clock source to drive the
OSC1 pin.
FIGURE 10-3: CRYSTAL/CERAMIC
FIGURE 10-4: EXTERNAL CLOCK INPUT
TABLE 10-1:
HS
Note :
Resonators Used:
4 MHz
8 MHz
16 MHz
See Table 10-1 and Table 10-2 for recommended
values of C1 and C2.
1996 Microchip Technology Inc.
Note 1: A series resistor may be required for AT
Mode
Clock from
ext. system
All resonators used did not have built-in capacitors.
Recommended values of C1 and C2 are identical to
the ranges tested table.
Higher capacitance increases the stability of
oscillator but also increases the start-up time.
These values are for design guidance only. Since
each resonator has its own characteristics, the user
should consult the resonator manufacturer for
appropriate values of external components.
CRYSTAL OSCILLATOR/CERAMIC
RESONATOR
C1
C2
Murata Erie CSA4.00MG
Murata Erie CSA8.00MT
Murata Erie CSA16.00MX
strip cut crystals.
16 MHz
4 MHz
8 MHz
Open
Freq
Note1
XTAL
RS
RESONATOR OPERATION
(HS OSC CONFIGURATION)
OPERATION (HS OSC
CONFIGURATION)
CERAMIC RESONATORS
OSC1
OSC2
15 - 68 pF
10 - 68 pF
10 - 22 pF
OSC1
OSC2
RF
C1
PIC14000
PIC14000
SLEEP
SLPCON<3>
+/-.5%
+/-.5%
+/-.5%
To internal
logic
15 - 68 pF
10 - 68 pF
10 - 22 pF
C2
Preliminary
TABLE 10-2:
10.2.3
Either a prepackaged oscillator can be used or a simple
oscillator circuit with TTL gates can be built.
Prepackaged oscillators provide a wide operating
range and better stability. A well-designed crystal
oscillator will provide good performance with TTL
gates. Two types of crystal oscillator circuits can be
used; one with series resonance, or one with parallel
resonance.
Figure 10-5 shows implementation of a parallel
resonant oscillator circuit. The circuit is designed to use
the fundamental frequency of the crystal. The 74AS04
inverter performs the 180-degree phase shift that a
parallel oscillator requires. The 4.7 k resistor provides
the negative feedback for stability. The 10 k
potentiometer biases the 74AS04 in the linear region.
This could be used for external oscillator designs.
FIGURE 10-5: EXTERNAL PARALLEL
Note :
Mode
HS
10k
Higher capacitance increases the stability of
oscillator but also increases the start-up time.
These values are for design guidance only. Rs may
be required in HS mode to avoid overdriving
crystals with low drive level specification. Since
each crystal has its own characteristics, the user
should consult the crystal manufacturer for
appropriate values of external components.
For V
EXTERNAL CRYSTAL OSCILLATOR
CIRCUIT
+5V
20 MHz
DD
4 MHz
8 MHz
20pF
10k
Freq
> 4.5V, C1 = C2
74AS04
XTAL
CAPACITOR SELECTION
FOR CRYSTAL OSCILLATOR
RESONANT CRYSTAL
OSCILLATOR CIRCUIT
4.7k
20pF
15 - 33 pF
15 - 47 pF
15 - 47 pF
10k
74AS04
PIC14000
C1
30pf is recommended.
DS40122B-page 77
To Other
Devices
15 - 33 pF
15 - 47 pF
15 - 47 pF
OSC1
C2