PIC16C712-20/P Microchip Technology, PIC16C712-20/P Datasheet - Page 48

• Manufacturer Part Number: PIC16C712-20/P
• Description: IC MCU OTP 1KX14 A/D PWM 18DIP
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16C712-20/P

• Core Size: 8-Bit
• Program Memory Size: 1.75KB (1K x 14)
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Core Processor: PIC
• Speed: 20MHz
• Number Of I /o: 13
• Program Memory Type: OTP
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 4x8b
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 18-DIP (0.300", 7.62mm)
• Controller Family/series: PIC16C
• No. Of I/o's: 13
• Ram Memory Size: 128Byte
• Cpu Speed: 20MHz
• No. Of Timers: 3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Connectivity: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

PIC16C712/716
8.1
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 8-4. 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 8-4:
DS41106A-page 48
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
PIN
T
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
V
DD
T
= 0.6V
). The
V
T
Preliminary
SS
SS
= 0.6V
)
)
I leakage
500 nA
To calculate the minimum acquisition time, T
the
(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
Note:
IC
PICmicro™
1k
V
SS R
DD
Sampling
Switch
When the conversion is started, the hold-
ing capacitor is disconnected from the
input pin.
6V
5V
4V
3V
2V
SS
Mid-Range
Sampling Switch
5 6 7 8 9 10 11
V
SS
C
= DAC capacitance
= 51.2 pF
(k )
HOLD
1999 Microchip Technology Inc.
Reference
ACQ
Manual,
, see