PIC16F689T-I/SO View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F689T-I/SO

20-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

Microchip Technology 

PIC16F631/677/685/687/689/690

Note 1: The reference voltage (VREF) has no effect on the equation, since it cancels itself out.

2: The charge holding capacitor (CHOLD) is not discharged after each conversion.

3: The maximum recommended impedance for analog sources is 10 kΩ. This is required to meet the pin

leakage specification.

FIGURE 9-4:

ANALOG INPUT MODEL

Rs ANx

VDD

VT = 0.6V

RIC ≤ 1k

Sampling

Switch

SS Rss

VA

CPIN

5 pF

VT = 0.6V

I LEAKAGE(1)

CHOLD = 10 pF

VSS/VREF-

Legend: CPIN

= Input Capacitance

VT

= Threshold Voltage

I LEAKAGE = Leakage current at the pin due to

various junctions

RIC

= Interconnect Resistance

SS

= Sampling Switch

CHOLD = Sample/Hold Capacitance

Note 1: See Section 17.0 “Electrical Specifications”.

6V

5V

RSS

VDD 4V

3V

2V

5 6 7 8 9 10 11

Sampling Switch

(kΩ)

FIGURE 9-5:

ADC TRANSFER FUNCTION

3FFh

3FEh

3FDh

3FCh

3FBh

004h

003h

002h

001h

000h

VSS/VREF-

Full-Scale Range

1 LSB ideal

Zero-Scale

Transition

1 LSB ideal

Full-Scale

Transition

Analog Input Voltage

VDD/VREF+

© 2008 Microchip Technology Inc.

DS41262E-page 117

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