PIC16F877A-I/L Microchip Technology, PIC16F877A-I/L Datasheet - Page 132

IC MCU FLASH 8KX14 EE 44PLCC

PIC16F877A-I/L

Manufacturer Part Number
PIC16F877A-I/L
Description
IC MCU FLASH 8KX14 EE 44PLCC
Manufacturer
Microchip Technology
Series
PIC® 16Fr

Specifications of PIC16F877A-I/L

Program Memory Type
FLASH
Program Memory Size
14KB (8K x 14)
Package / Case
44-PLCC
Core Processor
PIC
Core Size
8-Bit
Speed
20MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
33
Eeprom Size
256 x 8
Ram Size
368 x 8
Voltage - Supply (vcc/vdd)
4 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Processor Series
PIC16F
Core
PIC
Data Bus Width
8 bit
Data Ram Size
368 B
Interface Type
I2C/SPI/USART
Maximum Clock Frequency
20 MHz
Number Of Programmable I/os
33
Number Of Timers
3
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, ICE2000, DM163022, DV164120
Minimum Operating Temperature
- 40 C
On-chip Adc
8-ch x 10-bit
Package
44PLCC
Device Core
PIC
Family Name
PIC16
Maximum Speed
20 MHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
AC164309 - MODULE SKT FOR PM3 44PLCC444-1001 - DEMO BOARD FOR PICMICRO MCUDVA16XL441 - ADAPTER DEVICE ICE 44PLCC309-1040 - ADAPTER 44-PLCC ZIF TO 40-DIP309-1039 - ADAPTER 44-PLCC TO 40-DIPDV007003 - PROGRAMMER UNIVERSAL PROMATE II
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
PIC16F877AI/L

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PIC16F87XA
11.1
For the A/D converter to meet its specified accuracy,
the charge holding capacitor (C
to fully charge to the input channel voltage level. The
analog input model is shown in Figure 11-2. The source
impedance (R
impedance (R
charge the capacitor C
(R
see Figure 11-2. The maximum recommended
impedance for analog sources is 2.5 k . As the
impedance is decreased, the acquisition time may be
EQUATION 11-1:
FIGURE 11-2:
DS39582B-page 130
T
T
T
SS
ACQ
C
ACQ
Note 1: The reference voltage (V
) impedance varies over the device voltage (V
2: The charge holding capacitor (C
3: The maximum recommended impedance for analog sources is 2.5 k . This is required to meet the pin
A/D Acquisition Requirements
=
=
=
=
=
=
=
=
leakage specification.
Amplifier Settling Time + Hold Capacitor Charging Time + Temperature Coefficient
T
2 s + T
C
- 120 pF (1 k + 7 k + 10 k ) In(0.0004885)
16.47 s
2 s + 16.47 s + [(50°C – 25 C)(0.05 s/ C)
19.72 s
SS
AMP
Legend: C
S
HOLD
) and the internal sampling switch
) directly affect the time required to
+ T
(R
C
VA
C
ACQUISITION TIME
ANALOG INPUT MODEL
+ [(Temperature – 25°C)(0.05 s/°C)]
IC
V
I
R
SS
C
+ T
R
LEAKAGE
HOLD
PIN
T
IC
HOLD
+ R
S
COFF
SS
ANx
. The sampling switch
C
5 pF
+ R
HOLD
PIN
= input capacitance
= threshold voltage
= leakage current at the pin due to
= interconnect resistance
= sampling switch
= sample/hold capacitance (from DAC)
S
) In(1/2047)
various junctions
) must be allowed
REF
) has no effect on the equation since it cancels itself out.
HOLD
V
DD
V
V
) is not discharged after each conversion.
T
T
DD
= 0.6V
= 0.6V
);
I
± 500 nA
LEAKAGE
decreased. After the analog input channel is selected
(changed), this acquisition must be done before the
conversion can be started.
To
Equation 11-1 may be used. This equation assumes
that 1/2 LSb error is used (1024 steps for the A/D). The
1/2 LSb error is the maximum error allowed for the A/D
to meet its specified resolution.
To calculate the minimum acquisition time, T
the PICmicro
Manual (DS33023).
R
IC
calculate
1K
V
Sampling
SS R
DD
Switch
6V
5V
4V
3V
2V
®
SS
Mid-Range MCU Family Reference
the
Sampling Switch
5 6 7 8 9 10 11
V
minimum
SS
 2003 Microchip Technology Inc.
C
= DAC Capacitance
= 120 pF
(k )
HOLD
acquisition
ACQ
, see
time,

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