PIC16C63A-20E/SS Microchip Technology, PIC16C63A-20E/SS Datasheet - Page 82

• Manufacturer Part Number: PIC16C63A-20E/SS
• Description: IC MCU OTP 4KX14 PWM 28SSOP
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16C63A-20E/SS

• 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: 22
• Program Memory Size: 7KB (4K x 14)
• Program Memory Type: OTP
• Ram Size: 192 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 28-SSOP
• For Use With: 309-1025 - ADAPTER 28-SSOP TO 28-DIP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -

PIC16C63A/65B/73B/74B
12.1
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 12-2. The
source impedance (R
switch (R
required to charge the capacitor C
switch (R
(V
offset voltage at the analog input (due to pin leakage
current).
FIGURE 12-2:
EQUATION 12-1:
DS30605C-page 82
T
DD
ACQ
), Figure 12-2. The source impedance affects the
A/D Acquisition Requirements
=
=
SS
SS
) impedance varies over the device voltage
) impedance directly affect the time
Amplifier Settling Time +
Hold Capacitor Charging Time +
Temperature Coefficient
T
T
T
T
AMP
AMP
C
COFF
= - (51.2 pF)(1 k + R
Legend:
+ T
= 5 S
= (Temp -25 C)(0.05 S/ C)
VA
C
ANALOG INPUT MODEL
ACQUISITION TIME
S
+ T
) and the internal sampling
Rs
C
V
I leakage
R
SS
C
T
COFF
PIN
IC
HOLD
ANx
C
5 pF
HOLD
PIN
= input capacitance
= threshold voltage
= leakage current at the pin due to
= interconnect resistance
= sampling switch
= sample/hold capacitance (from DAC)
HOLD
various junctions
) must be allowed
SS
. The sampling
+ R
S
) In(1/511)
V
DD
V
V
T
T
= 0.6 V
= 0.6 V
I leakage
± 500 nA
The maximum recommended impedance for ana-
log sources is 10 k . After the analog input channel is
selected (changed), the acquisition time (T
pass before the conversion can be started.
To
Equation 12-1 may be used. This equation assumes
that 1/2 LSb error is used (512 steps for the A/D). The
1/2 LSb error is the maximum error allowed for the A/D
to meet its specified resolution.
For more information, see the PICmicro™ Mid-Range
MCU Family Reference Manual (DS33023). In general,
however, given a maximum source impedance of
10 k
will be no more than 16 sec.
R
IC
£ 1k
calculate
and a worst case temperature of 100°C, T
V
SS R
DD
Sampling
Switch
6V
5V
4V
3V
2V
SS
the
Sampling Switch
5 6 7 8 9 10 11
V
minimum
SS
C
= DAC capacitance
= 51.2 pF
(k )
HOLD
2000 Microchip Technology Inc.
acquisition
ACQ
) must
time,
ACQ