PIC16F87-E/SO Microchip Technology, PIC16F87-E/SO Datasheet - Page 119
![IC MCU FLASH 4KX14 EEPROM 18SOIC](/photos/6/76/67656/150-18-soic_sml.jpg)
PIC16F87-E/SO
Manufacturer Part Number
PIC16F87-E/SO
Description
IC MCU FLASH 4KX14 EEPROM 18SOIC
Manufacturer
Microchip Technology
Series
PIC® 16Fr
Datasheets
1.PIC16F616T-ISL.pdf
(8 pages)
2.PIC16F688T-ISL.pdf
(688 pages)
3.PIC16F818-ISO.pdf
(6 pages)
4.PIC16F87-IP.pdf
(228 pages)
5.PIC16F87-IP.pdf
(8 pages)
6.PIC16F87-IP.pdf
(4 pages)
7.PIC16F87-IP.pdf
(8 pages)
8.PIC16F87-IP.pdf
(24 pages)
Specifications of PIC16F87-E/SO
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
16
Program Memory Size
7KB (4K x 14)
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
368 x 8
Voltage - Supply (vcc/vdd)
4 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Package / Case
18-SOIC (7.5mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Data Converters
-
- PIC16F616T-ISL PDF datasheet
- PIC16F688T-ISL PDF datasheet #2
- PIC16F818-ISO PDF datasheet #3
- PIC16F87-IP PDF datasheet #4
- PIC16F87-IP PDF datasheet #5
- PIC16F87-IP PDF datasheet #6
- PIC16F87-IP PDF datasheet #7
- PIC16F87-IP PDF datasheet #8
- Current page: 119 of 228
- Download datasheet (5Mb)
12.1
For the A/D converter to meet its specified accuracy, the
charge holding capacitor (C
fully charge to the input channel voltage level. The ana-
log input model is shown in Figure 12-2. The source
impedance (R
impedance directly affect the time required to charge the
capacitor C
varies over the device voltage (V
The maximum recommended impedance for analog
sources is 10 k . As the impedance is decreased, the
EQUATION 12-1:
FIGURE 12-2:
2005 Microchip Technology Inc.
T
T
T
ACQ
C
ACQ
Note 1: The reference voltage (V
2: The charge holding capacitor (C
3: The maximum recommended impedance for analog sources is 10 k . This is required to meet the pin
4: After a conversion has completed, a 2.0 T
A/D Acquisition Requirements
=
=
=
=
=
=
=
=
HOLD
leakage specification.
During this time, the holding capacitor is not connected to the selected A/D input channel.
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
S
AMP
Legend: C
HOLD
) and the internal sampling switch (R
. The sampling switch (R
+ 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
T
+ R
PIN
IC
HOLD
S
COFF
HOLD
SS
ANx
C
5 pF
+ R
PIN
) must be allowed to
DD
= 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
), see Figure 12-2.
REF
SS
) has no effect on the equation, since it cancels itself out.
) impedance
HOLD
V
DD
V
V
) is not discharged after each conversion.
T
T
SS
= 0.6V
= 0.6V
)
AD
delay must complete before acquisition can begin again.
I
±500 nA
LEAKAGE
acquisition time may be decreased. After the analog
input channel is selected (changed), this acquisition
must be done before the conversion can be started.
To
Equation 12-1 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
PIC16F87/88
V
minimum
SS
C
= DAC Capacitance
= 120 pF
(k )
HOLD
DS30487C-page 117
acquisition
ACQ
, see
time,
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