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参数资料
型号： PIC16LC433E/P
元件分类： 微控制器/微处理器
英文描述： 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDIP18
封装： 0.300 INCH, PLASTIC, DIP-18
文件页数： 67/122页
文件大小： 1862K
代理商： PIC16LC433E/P
2001 Microchip Technology Inc.
Advance Information
DS41139A-page 47
PIC16C433
8.5
A/D Operation During SLEEP
The A/D module can operate during SLEEP mode. This
requires that the A/D clock source be set to RC
(ADCS<1:0> = 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.
8.6
A/D Accuracy/Error
The overall accuracy of the A/D is less than
± 1 LSb for
VDD = 5V
± 10% and the analog VREF = VDD. This over-
all accuracy includes offset error, full scale error, and
integral error. The A/D converter is monotonic over the
full VDD range. The resolution and accuracy may be
less when either the analog reference (VDD) is less
than 5.0V, or when the analog reference (VREF) is less
than VDD.
The maximum pin leakage current is specified in the
Device Data Sheet electrical specification, parameter
#D060.
In systems where the device frequency is low, use of
the A/D RC clock is preferred. At moderate to high fre-
quencies, TAD should be derived from the device oscil-
lator. TAD must not violate the minimum and should be
≤ 8 s for preferred operation. This is because TAD,
when derived from TOSC, is kept away from on-chip
phase clock transitions. This reduces, to a large extent,
the effects of digital switching noise. This is not possi-
ble 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 is stopped. This
method gives high accuracy.
8.7
Effects of a RESET
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 RESET. The
ADRES register will contain unknown data after a
Power-on Reset.
8.8
Connection Considerations
If the input voltage exceeds the rail values (VSS or VDD)
by greater than 0.2V, then the accuracy of the conver-
sion is out of specification.
An external RC filter is sometimes added for anti-
aliasing 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
Transfer Function
The ideal transfer function of the A/D converter is as
follows: the first transition occurs when the analog input
voltage (VAIN) is 1 LSb (or Analog VREF/256) (Figure 8-
3).
FIGURE 8-3:
A/D TRANSFER FUNCTION
Note:
For the A/D module to operate in SLEEP,
the A/D clock source must be set to RC
(ADCS<1:0> = 11). To perform an A/D
conversion in SLEEP, the GO/DONE bit
must be set, followed by the SLEEP
instruction.
Note:
For the PIC16C433, care must be taken
when using the GP4 pin in A/D conver-
sions due to its proximity to the OSC1 pin.
Digi
tal
Cod
e
Output
FFh
FEh
04h
03h
02h
01h
00h
0.
5
LS
b
1
L
S
b
2
L
S
b
3
L
S
b
4
L
S
b
255
LSb
256
LSb
(f
ull
s
c
ale)
Analog Input Voltage
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相关代理商/技术参数
参数描述
PIC16LC433-I/P 功能描述:8位微控制器 -MCU 10MHz 2K EPROM RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC16LC433-I/SO 功能描述:8位微控制器 -MCU 10MHz 2K EPROM RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC16LC433T-I/SO 功能描述:8位微控制器 -MCU 10MHz 2K EPROM RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC16LC505-04/P 功能描述:8位微控制器 -MCU 1.5KB 72 RAM 12 I/O 4MHz PDIP14 RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC16LC505-04/SL 功能描述:8位微控制器 -MCU 1.5KB 72 RAM 12 I/O 4MHz SOIC14 RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
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