PIC18F45K20-E/MV Microchip Technology, PIC18F45K20-E/MV Datasheet - Page 275
![32KB, Flash, 1536bytes-RAM, 36I/O, 8-bit Family,nanowatt XLP 40 UQFN 5x5x0.5mm T](/photos/16/15/161538/qfn-40_sml.jpg)
PIC18F45K20-E/MV
Manufacturer Part Number
PIC18F45K20-E/MV
Description
32KB, Flash, 1536bytes-RAM, 36I/O, 8-bit Family,nanowatt XLP 40 UQFN 5x5x0.5mm T
Manufacturer
Microchip Technology
Series
PIC® XLP™ 18Fr
Datasheet
1.PIC18F25K20T-ISS.pdf
(456 pages)
Specifications of PIC18F45K20-E/MV
Processor Series
PIC18
Core
PIC18F
Data Bus Width
8 bit
Program Memory Type
Flash
Program Memory Size
8 KB
Data Ram Size
512 B
Interface Type
I2C, SPI, SCI, USB, MSSP, RJ11
Maximum Clock Frequency
64 MHz
Number Of Programmable I/os
35
Number Of Timers
4
Operating Supply Voltage
1.8 V to 3.6 V
Maximum Operating Temperature
+ 125 C
Mounting Style
SMD/SMT
Package / Case
UQFN-40
Development Tools By Supplier
MPLAB Integrated Development Environment
Minimum Operating Temperature
- 40 C
Operating Temperature Range
- 40 C to + 125 C
Supply Current (max)
30 uA
Core Processor
PIC
Core Size
8-Bit
Speed
48MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, HLVD, POR, PWM, WDT
Number Of I /o
35
Eeprom Size
256 x 8
Ram Size
1.5K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 3.6 V
Data Converters
A/D 14x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Lead Free Status / Rohs Status
Details
- Current page: 275 of 456
- Download datasheet (4Mb)
19.3
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 19-5. 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 source impedance is
decreased, the acquisition time may be decreased.
After the analog input channel is selected (or changed),
EQUATION 19-1:
2010 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 k. This is required to meet the pin
A/D Acquisition Requirements
HOLD
leakage specification.
T
V
S
V
V
ACQ
T
) and the internal sampling switch (R
T
APPLIE D
. The sampling switch (R
ACQ
APPLIE D
APPLI ED
C
C
=
=
=
=
=
:
C
HOLD
=
=
=
–
ACQUISITION TIME EXAMPLE
Temperature
–
5µs
7.45µs
can be approximated with the following equations:
1.20
13.5pF 1k
C
Amplifier Settling Time
T
5µs
) must be allowed to fully
AMP
1
HOLD
1 e
+
1 e
µs
–
+
–
1.20µs
–
----------- -
2047
+
T
R
C
DD
1
–
--------- -
–
-------- -
T
RC
RC
T
Tc
IC
+
C
), see Figure 19-5.
C
+
+
+
+
REF
=
T
Temperature - 25°C
R
700
SS
=
=
=
COFF
) has no effect on the equation, since it cancels itself out.
SS
50°C- 25°C
50°C and external impedance of 10k
) impedance
V
V
V
+
HOLD
CHOL D
CHOL D
APPL IED
+
R
S
10k
+
ln(1/2047)
) is discharged after each conversion.
SS
Hold Capacitor Charging Time
)
0.05
ln(0.0004885)
1
–
0.05µs/°C
----------- -
2047
s/
1
an A/D acquisition must be done before the conversion
can be started. To calculate the minimum acquisition
time, Equation 19-1 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.
°C
PIC18F2XK20/4XK20
;[2] V
;combining [1] and [2]
;[1] V
CHOLD
CHOLD
3.0V V
+
charged to within 1/2 lsb
charge response to V
Temperature Coefficient
DD
DS41303G-page 275
APPLIED
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