參數(shù)資料
型號(hào)： pic12ce674
廠商： Microchip Technology Inc.
英文描述： 8-Pin, 8-Bit CMOS Microcontroller with A/D Converter(具A/D轉(zhuǎn)換器和EEPROM數(shù)據(jù)存儲(chǔ)器的8位微控制器)
中文描述： 8引腳，8位CMOS微控制器與A / D轉(zhuǎn)換器（具的A / D轉(zhuǎn)換器和EEPROM的數(shù)據(jù)存儲(chǔ)器的8位微控制器）
文件頁(yè)數(shù)： 43/112頁(yè)
文件大?。?/td> 1205K
代理商： PIC12CE674
1998 Microchip Technology Inc.
Preliminary
DS40181A-page 43
PIC12CE67X
8.5
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.
A/D Operation During Sleep
8.6
The overall accuracy of the A/D is less than
±
1 LSb for
V
DD
= 5V
±
10% and the analog V
REF
= V
DD
. 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
DD
) is less than
5.0V or when the analog reference (V
REF
) is less than
V
DD
.
The maximum pin leakage current is
±
5
μ
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
AD
should be derived from the device oscil-
lator. T
AD
must not violate the minimum and should be
≤
8
μ
s for preferred operation. This is because T
AD
,
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 significant 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.
A/D Accuracy/Error
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.
8.7
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
register is not modified for a Power-on Reset. The
ADRES register will contain unknown data after a
Power-on Reset.
Effects of a RESET
8.8
If the input voltage exceeds the rail values (V
SS
or V
DD
)
by greater than 0.2V, then the accuracy of the conver-
sion is out of specification.
Connection Considerations
An external RC filter 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
recommended specification. 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
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).
Transfer Function
FIGURE 8-5:
A/D TRANSFER FUNCTION
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.
D
FFh
FEh
04h
03h
02h
01h
00h
0
1
2
3
4
2
2
(
Analog input voltage
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參數(shù)描述
PIC12CE674/JW 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 6 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC12CE674-04/JM 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:8-Pin, 8-Bit CMOS Microcontroller with A/D Converter
PIC12CE674-04/JW 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:8-Pin, 8-Bit CMOS Microcontroller with A/D Converter and EEPROM Data Memory
PIC12CE674-04/P 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 6 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC12CE674-04/P 制造商:Microchip Technology Inc 功能描述:IC 8BIT CMOS MCU 12CE674 DIP8
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