PIC16C72-20E/SO Microchip Technology, PIC16C72-20E/SO Datasheet - Page 56

• Manufacturer Part Number: PIC16C72-20E/SO
• Description: IC MCU OTP 2KX14 A/D PWM 28SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16C72-20E/SO

• 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
• Program Memory Size: 3.5KB (2K x 14)
• Program Memory Type: OTP
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 6 V
• Data Converters: A/D 5x8b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 28-SOIC (7.5mm Width)
• 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: 2.5 V to 6 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• 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 bit, 5 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

PIC16C72 Series
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 9-4. 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 be done before the
conversion can be started.
FIGURE 9-4:
DS39016A-page 56
A/D Acquisition Requirements
S
) and the internal sampling switch (R
HOLD
ANALOG INPUT MODEL
Legend C
VA
. The sampling switch (R
Rs
V
I leakage
R
SS
C
T
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)
various junctions
) must be allowed
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
the PICmicro™ Mid-Range MCU Reference Manual,
DS33023. 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.
R
IC
1k
V
SS R
DD
Sampling
Switch
6V
5V
4V
3V
2V
SS
Sampling Switch
5 6 7 8 9 10 11
V
SS
C
= DAC capacitance
= 51.2 pF
( k )
HOLD
1998 Microchip Technology Inc.
ACQ
, see