PIC16LF873A-I/ML Microchip Technology, PIC16LF873A-I/ML Datasheet - Page 132

• Manufacturer Part Number: PIC16LF873A-I/ML
• Description: IC PIC MCU FLASH 4KX14 28QFN
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16LF873A-I/ML

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 10MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 22
• Program Memory Size: 7KB (4K x 14)
• Program Memory Type: FLASH
• Eeprom Size: 128 x 8
• Ram Size: 192 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 5x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: PIC16LF873A-I/MLR; PIC16LF873A-I/MLR

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,