PIC18LF4580ISOSQTP View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18LF4580ISOSQTP

28/40/44-Pin Enhanced Flash Microcontrollers with ECAN™ Technology, 10-Bit A/D and nanoWatt Technology

Microchip Technology 

PIC18F2480/2580/4480/4580

FIGURE 28-22: A/D CONVERSION TIMING

BSF ADCON0, GO

(Note 2)

131

Q4

130

A/D CLK

132

A/D DATA

9

8 7 ... ... 2

1

0

ADRES

ADIF

GO

SAMPLE

OLD_DATA

SAMPLING STOPPED

NEW_DATA

TCY

DONE

Note 1:

2:

If the A/D clock source is selected as RC, a time of TCY is added before the A/D clock starts. This allows the SLEEP instruction

to be executed.

This is a minimal RC delay (typically 100 ns), which also disconnects the holding capacitor from the analog input.

TABLE 28-25: A/D CONVERSION REQUIREMENTS

Param

No.

Symbol

Characteristic

Min Max Units

Conditions

130 TAD

A/D Clock Period

PIC18FXXXX

PIC18LFXXXX

0.7 25.0(1) μs TOSC based, VREF ≥ 3.0V

1.4 25.0(1) μs VDD = 2.0V;

TOSC based, VREF full range

PIC18FXXXX

—

1

μs A/D RC mode

PIC18LFXXXX —

3

μs VDD = 2.0V;

A/D RC mode

131 TCNV Conversion Time

11

(not including acquisition time) (Note 2)

12

TAD

132 TACQ Acquisition Time (Note 3)

1.4

—

μs -40°C to +85°C

135 TSWC Switching Time from Convert → Sample — (Note 4) —

136 TAMP Amplifier Settling Time (Note 5)

1

—

μs This may be used if the “new” input

voltage has not changed by more

than 1 LSb (i.e., 5 mV @ 5.12V)

from the last sampled voltage (as

stated on CHOLD).

Note 1: The time of the A/D clock period is dependent on the device frequency and the TAD clock divider.

2: ADRES register may be read on the following TCY cycle.

3: The time for the holding capacitor to acquire the “New” input voltage when the voltage changes full scale

after the conversion (AVDD to AVSS or AVSS to AVDD). The source impedance (RS) on the input channels is

50Ω.

4: On the following cycle of the device clock.

5: See Section 20.0 “10-Bit Analog-to-Digital Converter (A/D) Module” for minimum conditions when input

voltage has changed more than 1 LSb.

© 2009 Microchip Technology Inc.

DS39637D-page 457

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