PIC12F615 datasheet(68/212 Pages) MICROCHIP

68 / 212 page

PIC12F609/615/617/12HV609/615

DS41302D-page 68

 2010 Microchip Technology Inc.

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.

maximum

source

impedance

 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

minimize

inaccuracies

introduced.

FIGURE 9-3:

ANALOG INPUT MODEL

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.

RS < 10K

CPIN

5 pF

VDD

 0.6V

RIC

ILEAKAGE

±500 nA

VSS

AIN

Legend: CPIN

= Input Capacitance

ILEAKAGE = Leakage Current at the pin due to various junctions

RIC

= Interconnect Resistance

= Source Impedance

= Analog Voltage

= Threshold Voltage

To Comparator

PIC12F615 데이터시트(PDF) 68 Page - Microchip Technology

PIC12F615 데이터시트(HTML) 68 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

데이터시트 다운로드

링크 URL