PIC12CE674 Datasheet

IC型号：
PIC12CE674
PDF描述：
8-Pin, 8-Bit CMOS Microcontroller with A/D Converter and EEP...
文件大小：
1264.35KB
PDF页数：
129页
芯片厂家：
Microchip

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PIC12CE67X

8.5

A/D Operation During Sleep

8.7

Effects of a RESET

The A/D module can operate during SLEEP mode. This

requires that the A/D clock source be set to RC

(ADCS1:ADCS0 =

11).

When the RC clock source is

selected, the A/D module waits one instruction cycle

before starting the conversion. This allows the

SLEEP

instruction to be executed, which eliminates all digital

switching noise from the conversion. When the conver-

sion is completed the GO/DONE bit will be cleared, and

the result loaded into the ADRES register. If the A/D

interrupt is enabled, the device will wake-up from

SLEEP. If the A/D interrupt is not enabled, the A/D mod-

ule will then be turned off, although the ADON bit will

remain set.

When the A/D clock source is another clock option (not

RC), a

SLEEP

instruction will cause the present conver-

sion to be aborted and the A/D module to be turned off,

though the ADON bit will remain set.

Turning off the A/D places the A/D module in its lowest

current consumption state.

Note:

For the A/D module to operate in SLEEP,

the A/D clock source must be set to RC

(ADCS1:ADCS0 =

11).

To perform an A/D

conversion in SLEEP, the GO/DONE bit

must be set, followed by the

SLEEP

instruc-

tion.

A device reset forces all registers to their reset state.

This forces the A/D module to be turned off, and any

conversion is aborted. The value that is in the ADRES

ter will contain unknown data after a Power-on Reset.

8.8

Connection Considerations

If the input voltage exceeds the rail values (V

or V

)

by greater than 0.2V, then the accuracy of the conver-

sion is out of speci铿乧ation.

Note:

For the PIC12CE67X, care must be taken

when using the GP4 pin in A/D conver-

sions due to its proximity to the OSC1 pin.

An external RC 铿乴ter is sometimes added for anti-alias-

ing of the input signal. The R component should be

selected to ensure that the total source impedance is

kept under the 10 k鈩?recommended speci铿乧ation. Any

external components connected (via hi-impedance) to

an analog input pin (capacitor, zener diode, etc.) should

have very little leakage current at the pin.

8.9

Transfer Function

8.6

A/D Accuracy/Error

The ideal transfer function of the A/D converter is as fol-

lows: the first transition occurs when the analog input

voltage (V

AIN

) is 1 LSb (or Analog V

REF

/ 256)

(Figure 8-5).

Digital code output

The overall accuracy of the A/D is less than

卤

1 LSb for

= 5V

卤

10% and the analog V

REF

= V

. This over-

all accuracy includes offset error, full scale error, and

integral error. The A/D converter is guaranteed to be

monotonic. The resolution and accuracy may be less

when either the analog reference (V

) is less than

5.0V or when the analog reference (V

REF

) is less than

The maximum pin leakage current is

卤

碌A.

In systems where the device frequency is low, use of

the A/D RC clock is preferred. At moderate to high fre-

quencies, T

should be derived from the device oscil-

lator. T

must not violate the minimum and should be

鈮?/div>

碌s

for preferred operation. This is because T

when derived from T

OSC

, is kept away from on-chip

phase clock transitions. This reduces, to a large extent,

the effects of digital switching noise. This is not possible

with the RC derived clock. The loss of accuracy due to

digital switching noise can be signi铿乧ant if many I/O

pins are active.

In systems where the device will enter SLEEP mode

after the start of the A/D conversion, the RC clock

source selection is required. In this mode, the digital

noise from the modules in SLEEP are stopped. This

method gives high accuracy.

FIGURE 8-5:

A/D TRANSFER FUNCTION

FFh

FEh

04h

03h

02h

01h

00h

256 LSb

(full scale)

255 LSb

0.5 LSb

1 LSb

2 LSb

3 LSb

4 LSb

Analog input voltage

漏

1998 Microchip Technology Inc.

Preliminary

DS40181B-page 43

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