PIC16F913-I/SS Microchip Technology, PIC16F913-I/SS Datasheet - Page 185

• Manufacturer Part Number: PIC16F913-I/SS
• Description: IC PIC MCU FLASH 4KX14 28SSOP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F913-I/SS

• Core Size: 8-Bit
• Program Memory Size: 7KB (4K x 14)
• Core Processor: PIC
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 24
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 5x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-SSOP
• Controller Family/series: PIC16F
• No. Of I/o's: 24
• Eeprom Memory Size: 256Byte
• Ram Memory Size: 256Byte
• Cpu Speed: 20MHz
• No. Of Timers: 3
• Package: 28SSOP
• Device Core: PIC
• Family Name: PIC16
• Maximum Speed: 20 MHz
• Operating Supply Voltage: 5 V
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 24
• Interface Type: I2C/SPI/USART
• On-chip Adc: 5-chx10-bit
• Number Of Timers: 3
• Processor Series: PIC16F
• Core: PIC
• Data Ram Size: 352 B
• Maximum Clock Frequency: 20 MHz
• 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, DV164120
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: AC164307 - MODULE SKT FOR PM3 28SSOPXLT28SS-1 - SOCKET TRANSITION ICE 28SSOP
• Lead Free Status / Rohs Status: Details

12.3
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 12-4. 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),
EQUATION 12-1:
© 2007 Microchip Technology Inc.
The value for T
Solving for T
Therefore:
Note 1: The reference voltage (V
Assumptions:
V
V
V
Note: Where n = number of bits of the ADC.
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
AP P LI ED
AP P LI ED
AP P LI ED
HOLD
leakage specification.
T
S
ACQ
T
) and the internal sampling switch (R
T
C
. The sampling switch (R
ACQ
:
C
C
⎛
⎝
⎛
⎜
⎝
⎛
⎜
⎝
Temperature
can be approximated with the following equations:
=
=
=
=
=
1
1 e
1 e
HOLD
=
=
=
ACQUISITION TIME EXAMPLE
–
–
2μ
4.67μ
–
–
–
1.37
C
10pF 1k
Amplifier Settling Time
T
2μs
--------------------------
(
S
) must be allowed to fully
AMP
HOLD
2
–
--------- -
–
-------- -
RC
RC
+
μs
T
Tc
n
S
+
C
1.37μ
+
(
⎞
⎟
⎠
⎞
⎟
⎠
+
1
T
(
1
R
C
DD
) 1
=
Ω
T
=
IC
+
–
C
=
S
), see Figure 12-4.
+
V
V
+
[
+
+
REF
(
7k
A PP LIE D
CHOLD
⎞
⎠
50°C and external impedance of 10k
Temperature - 25°C
T
R
[
SS
(
Ω
) has no effect on the equation, since it cancels itself out.
COFF
SS
50°C- 25°C
=
) impedance
+
+
HOLD
V
10k
R
PIC16F913/914/916/917/946
CHOLD
⎛
⎝
S
) ln(1/2047)
+
1
Ω
) is not discharged after each conversion.
SS
–
Hold Capacitor Charging Time
)
ln(0.0004885)
) 0.05μ
)
--------------------------
(
(
2
n
+
) 0.05μs/°C
1
1
(
S
) 1
/°C
an A/D acquisition must be done before the conversion
can be started. To calculate the minimum acquisition
time, Equation 12-1 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.
–
)
⎞
⎠
]
;[1] V
;[2] V
;combining [1] and [2]
)
]
Ω
CHOLD
CHOLD
5.0V V
+
charged to within 1/2 lsb
charge response to V
DD
Temperature Coefficient
DS41250F-page 183
APPLIED