PIC16F636-I/ST Microchip Technology, PIC16F636-I/ST Datasheet - Page 64

• Manufacturer Part Number: PIC16F636-I/ST
• Description: IC MCU FLASH 2KX14 14TSSOP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F636-I/ST

• Program Memory Type: FLASH
• Program Memory Size: 3.5KB (2K x 14)
• Package / Case: 14-TSSOP
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Peripherals: Brown-out Detect/Reset, LVD, POR, WDT
• Number Of I /o: 11
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 128 B
• Interface Type: RS- 232/SPI/USB
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 12
• Number Of Timers: 2
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8 bit
• Package: 14TSSOP
• Device Core: PIC
• Family Name: PIC16
• Maximum Speed: 20 MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: AC162057 - MPLAB ICD 2 HEADER 14DIP
• Eeprom Size: -
• Data Converters: -
• Connectivity: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PIC12F635/PIC16F636/639
7.1
A single comparator is shown in Figure 7-1 along with
the relationship between the analog input levels and
the digital output. When the analog input at V
than the analog input V
is a digital low level. When the analog input at V
greater than the analog input V
comparator is a digital high level. The shaded areas of
the output of the comparator in Figure 7-1 represent
the uncertainty due to input offsets and response time.
The polarity of the comparator output can be inverted
by setting the CxINV bits (CMCON0<5:4>). Clearing
CxINV results in a non-inverted output. A complete
table showing the output state versus input conditions
and the polarity bit is shown in Table 7-1.
TABLE 7-1:
FIGURE 7-2:
DS41232B-page 62
Note:
Input Conditions
V
V
V
V
IN
IN
IN
IN
Comparator Operation
- > V
- < V
- > V
- < V
To use CIN+ and CIN- pins as analog
inputs, the appropriate bits must be
programmed in the CMCON0 (19h)
register.
VA
Legend:
Rs < 10 k
IN
IN
IN
IN
+
+
+
+
OUTPUT STATE VS. INPUT
CONDITIONS
IN
ANALOG INPUT MODEL
-, the output of the comparator
A
IN
C
V
I
R
R
VA
LEAKAGE
T
PIN
IC
S
CINV
IN
C
5 pF
0
0
1
1
PIN
-, the output of the
= Input Capacitance
= Threshold Voltage
= Leakage Current at the pin due to various junctions
= Interconnect Resistance
= Source Impedance
= Analog Voltage
CxOUT
IN
+ is less
0
1
1
0
IN
+ is
Preliminary
V
DD
V
V
T
T
= 0.6V
= 0.6V
connected to an analog input pin, such as a capacitor or
FIGURE 7-1:
7.2
A simplified circuit for an analog input is shown in
Figure 7-2. Since the analog pins are connected to a
digital output, they have reverse biased diodes to V
and V
V
range by more than 0.6V in either direction, one of the
diodes is forward biased and a latch-up may occur. A
maximum source impedance of 10 k is recommended
for the analog sources. Any external component
a Zener diode, should have very little leakage current.
SS
Output
V
V
Output
Note 1: When reading the Port register, all pins
IN
V
IN
V
IN–
IN+
and V
-
+
SS
V
V
IN
IN
. The analog input, therefore, must be between
2: Analog levels on any pin defined as a
Analog Input Connection
Considerations
I
±500 nA
Vss
+
-
LEAKAGE
DD
configured as analog inputs will read as a
‘0’. Pins configured as digital inputs will
convert as analog inputs according to the
input specification.
digital input may cause the input buffer to
consume more current than is specified.
. If the input voltage deviates from this
R
IC
+
–
SINGLE COMPARATOR
© 2005 Microchip Technology Inc.
Output
DD