PIC12F609T-I/P 查看數據表（PDF） - Microchip Technology

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PIC12F609T-I/P

8-Pin Flash-Based, 8-Bit CMOS Microcontrollers

Microchip Technology 

PIC12F609/615/617/12HV609/615

9.2 Analog Input Connection

Considerations

A simplified circuit for an analog input is shown in

Figure 9-3. Since the analog input pins share their

connection with a digital input, they have reverse

biased ESD protection diodes to VDD and VSS. The

analog input, therefore, must be between VSS and VDD.

If the input voltage deviates from this range by more

than 0.6V in either direction, one of the diodes is

forward biased and a latch-up may occur.

A maximum source impedance of 10 k is

recommended for the analog sources. Also, any

external component connected to an analog input pin,

such as a capacitor or a Zener diode, should have very

little leakage current to minimize inaccuracies

introduced.

FIGURE 9-3:

ANALOG INPUT MODEL

VDD

RS < 10K

VT  0.6V

AIN

VA

CPIN

5 pF

VT  0.6V

Note 1: When reading a GPIO register, all pins

configured as analog inputs will read as a

‘0’. Pins configured as digital inputs will

convert as an analog input, according to

the input specification.

2: Analog levels on any pin defined as a

digital input, may cause the input buffer to

consume more current than is specified.

RIC

ILEAKAGE

±500 nA

To Comparator

VSS

Legend:

CPIN = Input Capacitance

ILEAKAGE = Leakage Current at the pin due to various junctions

RIC

= Interconnect Resistance

RS

= Source Impedance

VA

= Analog Voltage

VT

= Threshold Voltage

DS41302D-page 68

 2010 Microchip Technology Inc.

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