PIC16F688 Datasheet, PDF (157/174 Pages) Microchip Technology – 14-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

PIC16F688
FIGURE 14-11: PIC16F688 A/D CONVERSION TIMING (SLEEP MODE)
BSF ADCON0, GO
134
Q4
A/D CLK
A/D Data
ADRES
ADIF
GO
Sample
132
(TOSC/2 + TCY)⁽¹⁾
131
130
1 TCY
9
8
76
3
2
1
0
OLD_DATA
NEW_DATA
Sampling Stopped
1 TCY
DONE
Note 1: 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.
TABLE 14-12: PIC16F688 A/D CONVERSION REQUIREMENTS (SLEEP MODE)
Standard Operating Conditions (unless otherwise stated)
Operating Temperature-40°C ≤ TA ≤ +125°C
Param
No.
Sym
Characteristic
Min
Typ†
Max Units
Conditions
130
TAD A/D Internal RC
Oscillator Period
3.0*
2.0*
131
Tcnv Conversion Time
—
(not including
Acquisition Time)⁽¹⁾
132
TACQ Acquisition Time
(2)
ADCS<1:0> = 11 (RC mode)
6.0
9.0* µs At VDD = 2.5V
4.0
6.0* µs At VDD = 5.0V
11
—
TAD
11.5
—
µs
5*
—
—
µs The minimum time is the amplifier
settling time. This may be used if
the “new” input voltage has not
changed by more than 1 LSb (i.e.,
4.1 mV @ 4.096V) from the last
sampled voltage (as stored on
CHOLD).
134
TGO Q4 to A/D Clock
Start
— TOSC/2 + TCY —
— 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.
* These parameters are characterized but not tested.
† Data in ‘Typ’ column is at 5.0V, 25°C unless otherwise stated. These parameters are for design guidance
only and are not tested.
Note 1: ADRES register may be read on the following TCY cycle.
2: See Table 8-1 for minimum conditions.
 2004 Microchip Technology Inc.
Preliminary
DS41203B-page 155