PIC16F688-I/SL Microchip Technology, PIC16F688-I/SL Datasheet - Page 75
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PIC16F688-I/SL
Manufacturer Part Number
PIC16F688-I/SL
Description
IC PIC MCU FLASH 4KX14 14SOIC
Manufacturer
Microchip Technology
Series
PIC® 16Fr
Datasheets
1.PIC16F616T-ISL.pdf
(8 pages)
2.PIC16F688T-ISL.pdf
(204 pages)
3.PIC16F688T-ISL.pdf
(6 pages)
4.PIC16F688T-ISL.pdf
(4 pages)
5.PIC16F688T-ISL.pdf
(688 pages)
6.PIC16F688-EP.pdf
(174 pages)
Specifications of PIC16F688-I/SL
Program Memory Type
FLASH
Program Memory Size
7KB (4K x 14)
Package / Case
14-SOIC (3.9mm Width), 14-SOL
Core Processor
PIC
Core Size
8-Bit
Speed
20MHz
Connectivity
UART/USART
Peripherals
Brown-out Detect/Reset, POR, WDT
Number Of I /o
12
Eeprom Size
256 x 8
Ram Size
256 x 8
Voltage - Supply (vcc/vdd)
2 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Processor Series
PIC16F
Core
PIC
Data Bus Width
8 bit
Data Ram Size
256 B
Interface Type
SCI, USART
Maximum Clock Frequency
20 MHz
Number Of Programmable I/os
12
Number Of Timers
1
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, DM163014, DM164120-4
Minimum Operating Temperature
- 40 C
On-chip Adc
8 bit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
XLT14SO-1 - SOCKET TRANSITION 14SOIC 150/208AC162061 - HEADER INTRFC MPLAB ICD2 20PINAC162056 - HEADER INTERFACE ICD2 16F688
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC16F688-I/SL
Manufacturer:
MICROCHIP
Quantity:
4 952
Company:
Part Number:
PIC16F688-I/SL
Manufacturer:
Microchip Technology
Quantity:
27 564
Part Number:
PIC16F688-I/SL
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
8.3
For the ADC to meet its specified accuracy, the charge
holding capacitor (C
charge to the input channel voltage level. The Analog
Input model is shown in Figure 8-4. 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 kΩ. As the source impedance is
decreased, the acquisition time may be decreased.
After the analog input channel is selected (or changed),
an A/D acquisition must be done before the conversion
EQUATION 8-1:
© 2009 Microchip Technology Inc.
Note 1: The reference voltage (V
The value for T
Solving for T
Therefore:
Assumptions:
2: The charge holding capacitor (C
3: The maximum recommended impedance for analog sources is 10 kΩ. This is required to meet the pin
A/D Acquisition Requirements
HOLD
T
leakage specification.
V
S
V
ACQ
V
T
) and the internal sampling switch (R
AP PLIE D
T
. The sampling switch (R
AP P LI ED
ACQ
AP P LIED
C
C
=
=
=
=
=
:
C
HOLD
=
=
=
2
ACQUISITION TIME EXAMPLE
Temperature
–
–
4.67
can be approximated with the following equations:
1.37
ΜS
10pF 1k
⎛
⎝
C
Amplifier Settling Time
T
2µs
⎛
⎜
⎝
⎛
⎜
⎝
1
) must be allowed to fully
AMP
HOLD
1 e
1 e
+
ΜS
µs
–
+
–
–
1.37
(
----------- -
2047
+
T
(
1
–
--------- -
R
C
–
-------- -
RC
RC
Ω
T
ΜS
DD
T
Tc
IC
+
C
C
+
⎞
⎠
⎞
⎟
⎠
⎞
⎟
⎠
), see Figure 8-4.
+
+
[
+
REF
(
7k
=
Temperature - 25°C
T
=
=
=
R
[
SS
(
Ω
COFF
) has no effect on the equation, since it cancels itself out.
SS
50°C- 25°C
) impedance
50°C and external impedance of 10k
V
V
V
+
+
CHOLD
CHOLD
A P PLIE D
HOLD
10k
R
S
) ln(1/2047)
+
Ω
) is not discharged after each conversion.
SS
)
Hold Capacitor Charging Time
ln(0.0004885)
)
) 0.05
⎛
⎝
(
1
–
) 0.05µs/°C
----------- -
2047
ΜS
(
1
/°C
can be started. To calculate the minimum acquisition
time, Equation 8-1 may be used. This equation
assumes that 1/2 LSb error is used (1024 steps for the
ADC). The 1/2 LSb error is the maximum error allowed
for the ADC to meet its specified resolution.
⎞
⎠
)
]
;[2] V
;combining [1] and [2]
;[1] V
)
]
CHOLD
CHOLD
Ω
5.0V V
+
charged to within 1/2 lsb
charge response to V
Temperature Coefficient
DD
PIC16F688
DS41203E-page 73
APPLIED