PIC16C62B-20I/SP Microchip Technology, PIC16C62B-20I/SP Datasheet - Page 52

• Manufacturer Part Number: PIC16C62B-20I/SP
• Description: IC MCU OTP 2KX14 PWM 28DIP
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16C62B-20I/SP

• Program Memory Type: OTP
• Program Memory Size: 3.5KB (2K x 14)
• Package / Case: 28-DIP (0.300", 7.62mm)
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 22
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC16C
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 128 B
• Interface Type: I2C/SPI/SSP
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 22
• Number Of Timers: 3
• Operating Supply Voltage: 4 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: ICE2000, DM163022
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8
• Data Rom Size: 128 B
• Height: 3.3 mm
• Length: 34.67 mm
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 4 V
• Width: 7.24 mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PIC16C62B/72A
9.1
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 9-2. The source
impedance (R
impedance directly affect the time required to charge
the capacitor C
impedance varies over the device voltage (V
source impedance affects the offset voltage at the ana-
log input (due to pin leakage current). The maximum
recommended impedance for analog sources is 10
k . After the analog input channel is selected
(changed), this acquisition must pass before the con-
version can be started.
FIGURE 9-2:
EQUATION 9-1:
DS35008B-page 52
T
ACQ
A/D Acquisition Requirements
=
=
S
Amplifier Settling Time +
Hold Capacitor Charging Time +
Temperature Coefficient
T
T
T
T
) and the internal sampling switch (R
AMP
AMP
C
COFF
HOLD
= - (51.2pF)(1k + R
ANALOG INPUT MODEL
Legend C
+ T
= 5 S
= (Temp -25 C)(0.05 S/ C)
VA
. The sampling switch (R
ACQUISITION TIME
C
Rs
+ T
V
I leakage
R
SS
C
T
PIN
IC
HOLD
COFF
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)
various junctions
) must be allowed
SS
+ R
S
) In(1/511)
V
DD
DD
). The
V
V
T
T
Preliminary
SS
SS
= 0.6V
= 0.6V
)
)
I leakage
± 500 nA
To calculate the minimum acquisition time, T
Equation 9-1. This equation calculates the acquisition
time to within 1/2 LSb error (512 steps for the A/D). The
1/2 LSb error is the maximum error allowed for the A/D
to meet its specified accuracy.
In general;
Assuming R
T
By increasing V
can be substantially reduced.
R
ACQ
Note:
IC
1k
13.0 Sec
V
SS R
DD
Sampling
Switch
When the conversion is started, the hold-
ing capacitor is disconnected from the
input pin.
Vdd
Temp. = 50 C (122 F)
S
6V
5V
4V
3V
2V
SS
DD
= 10k
= 3.0V (R
and reducing R
5 6 7 8 9 10 11
V
SS
C
= DAC capacitance
= 51.2 pF
R
(k )
HOLD
SS
1999 Microchip Technology Inc.
SS
= 10k
S
and Temp., T
ACQ
, see
ACQ