PIC16LF1902-ESS View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16LF1902-ESS

28-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt XLP Technology

Microchip Technology 

PIC16LF1902/3

TABLE 15-1: ADC CLOCK PERIOD (TAD) VS. DEVICE OPERATING FREQUENCIES

ADC Clock Period (TAD)

Device Frequency (FOSC)

ADC

Clock Source

ADCS<2:0>

20 MHz

16 MHz

8 MHz

4 MHz

1 MHz

FOSC/2

000

100 ns(2)

125 ns(2)

250 ns(2)

500 ns(2)

2.0 s

FOSC/4

100

200 ns(2)

250 ns(2)

500 ns(2)

1.0 s

4.0 s

FOSC/8

001

400 ns(2)

0.5 s(2)

1.0 s

2.0 s

8.0 s(3)

FOSC/16

101

800 ns

1.0 s

2.0 s

4.0 s

16.0 s(3)

FOSC/32

010

1.6 s

2.0 s

4.0 s

8.0 s(3)

32.0 s(3)

FOSC/64

110

3.2 s

4.0 s

8.0 s(3)

16.0 s(3)

64.0 s(3)

FRC

x11

1.0-6.0 s(1,4)

1.0-6.0 s(1,4)

1.0-6.0 s(1,4)

1.0-6.0 s(1,4)

1.0-6.0 s(1,4)

Legend:

Note 1:

2:

3:

4:

Shaded cells are outside of recommended range.

The FRC source has a typical TAD time of 1.6 s for VDD.

These values violate the minimum required TAD time.

For faster conversion times, the selection of another clock source is recommended.

The ADC clock period (TAD) and total ADC conversion time can be minimized when the ADC clock is derived from the

system clock FOSC. However, the FRC clock source must be used when conversions are to be performed with the

device in Sleep mode.

FIGURE 15-2:

ANALOG-TO-DIGITAL CONVERSION TAD CYCLES

TCY - TAD TAD1 TAD2 TAD3 TAD4 TAD5 TAD6 TAD7 TAD8 TAD9 TAD10 TAD11

b9 b8 b7 b6 b5 b4 b3 b2 b1 b0

Conversion starts

Holding capacitor is disconnected from analog input (typically 100 ns)

Set GO bit

On the following cycle:

ADRESH:ADRESL is loaded, GO bit is cleared,

ADIF bit is set, holding capacitor is connected to analog input.

 2011 Microchip Technology Inc.

Preliminary

DS41455A-page 115

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