參數(shù)資料
型號(hào)： 8XC552
廠商： NXP Semiconductors N.V.
英文描述： 80C51 FAMILY DERIVATIVES
中文描述： 80C51系列衍生物
文件頁(yè)數(shù)： 52/60頁(yè)
文件大小： 382K
代理商： 8XC552
Philips Semiconductors
80C51 Family Derivatives
8XC552/562 overview
1996 Aug 06
52
ADC Resolution and Analog Supply:
Figure 38 shows how the
ADC is realized. The ADC has its own supply pins (AV
DD
and AV
SS
)
and two pins (Vref+ and Vref–) connected to each end of the DAC’s
resistance-ladder. The ladder has 1023 equally spaced taps,
separated by a resistance of “R”. The first tap is located 0.5 x R
above Vref–, and the last tap is located 1.5 x R below Vref+. This
gives a total ladder resistance of 1024 x R. This structure ensures
that the DAC is monotonic and results in a symmetrical quantization
error as shown in Figure 40.
For input voltages between Vref– and (Vref–) + 1/2 LSB, the 10-bit
result of an A/D conversion will be 00 0000 0000B = 000H. For input
voltages between (Vref+) – 3/2 LSB and Vref+, the result of a
conversion will be 11 1111 1111B = 3FFH. AVref+ and AVref– may
be between AV
DD
+ 0.2V and AV
SS
– 0.2V. AVref+ should be
positive with respect to AVref–, and the input voltage (Vin) should be
between AVref+ and AVref–. If the analog input voltage range is from
2V to 4V, then 10-bit resolution can be obtained over this range if
AVref+ = 4V and AVref– = 2V.
The result can always be calculated from the following formula:
Result
1024
V
IN
AV
ref
AV
ref
AV
ref
Power Reduction Modes
The 8XC552 has two reduced power modes of operation: the idle
mode and the power-down mode. These modes are entered by
setting bits in the PCON special function register. When the 8XC552
enters the idle mode, the following functions are disabled:
CPU
Timer T2
PWM0, PWM1
ADC
(halted)
(halted and reset)
(reset; outputs are high)
(conversion aborted if in
progress).
In idle mode, the following functions remain active:
Timer 0
Timer 1
Timer T3
SIO0 SIO1
External interrupts
When the 8XC552 enters the power-down mode, the oscillator is
stopped. The power-down mode is entered by setting the PD bit in
the PCON register. The PD bit can only be set if the EW input is tied
HIGH.
Successive
Approximation
Control Logic
Successive
Approximation
Register
+
–
Decoder
MSB
Comparator
LSB
Start
Ready
AV
ref+
AV
ref–
R/2
R
R
R
R
R
R/2
Total resistance
=
1023R + 2 x R/
=
1024R
V
ref
V
in
1023
1022
1021
3
2
1
0
Value 0000 0000 00
Value 1111 1111 11
is output for voltages V
ref–
to (V
ref–
+ 1/2 LSB)
is output for voltages (V
ref+
– 3/2 LSB) to V
ref+
Figure 38. ADC Realization
相關(guān)PDF資料
PDF描述
8XL51FB LOW VOLTAGE CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLERS
8XL51FC LOW VOLTAGE CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLERS
8XL51FA LOW VOLTAGE CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLERS
8XL54 LOW VOLTAGE CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLERS
8XL58 LOW VOLTAGE CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLERS
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
8XC562 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:80C51 FAMILY DERIVATIVES
8XC58 制造商:INTEL 制造商全稱(chēng):Intel Corporation 功能描述:CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER
8XC80C32 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:8-bit CMOS (low voltage, low power and high speed) microcontroller families
8XF0016-S3P 制造商:XFMRS 制造商全稱(chēng):XFMRS Inc. 功能描述:INDUCTOR
8XF0106-S3P 制造商:XFMRS 制造商全稱(chēng):XFMRS Inc. 功能描述:INDUCTOR
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*