參數(shù)資料
型號(hào)： AT90LS2343-1PI
廠商： Atmel
文件頁數(shù)： 42/63頁
文件大?。?/td> 0K
描述： IC MCU 2K FLASH 1MHZ IND 8-DIP
標(biāo)準(zhǔn)包裝： 50
系列： AVR® 90LS
核心處理器： AVR
芯體尺寸： 8-位
速度： 1MHz
連通性： SPI
外圍設(shè)備： 欠壓檢測/復(fù)位，POR，WDT
輸入/輸出數(shù)： 5
程序存儲(chǔ)器容量： 2KB（1K x 16）
程序存儲(chǔ)器類型： 閃存
EEPROM 大?。?/td> 128 x 8
RAM 容量： 128 x 8
電壓 - 電源 (Vcc/Vdd)： 2.7 V ~ 6 V
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 8-DIP（0.300"，7.62mm）
包裝： 管件
PIC16C433
DS41139B-page 46
Preliminary
2002 Microchip Technology Inc.
8.1
A/D Sampling Requirements
For the A/D converter to meet its specified accuracy,
the charge holding capacitor (CHOLD) must be allowed
to fully charge to the input channel voltage level. The
analog input model is shown in Figure 8-2. The source
impedance (RS) and the internal sampling switch (RSS)
impedance directly affect the time required to charge
the capacitor CHOLD. The sampling switch (RSS)
impedance varies over the device voltage (VDD), see
Figure 8-2. The maximum recommended imped-
ance for analog sources is 10 k
. After the analog
input channel is selected (changed), this acquisition
must be done before the conversion can be started.
To calculate the minimum acquisition time, Equation 8-1
may be used. This equation assumes that 1/2 LSb error
is used (512 steps for the A/D). The 1/2 LSb error is the
maximum error allowed for the A/D to meet its specified
resolution.
EQUATION 8-1:
A/D MINIMUM CHARGING
TIME
Example 8-1 shows the calculation of the minimum
required acquisition time TACQ. This calculation is
based on the following system assumptions.
Rs = 10 k
1/2 LSb error
VDD = 5V
→ Rss = 7 k
Temperature (system max.) = 50
°C
VHOLD = 0 @ t = 0
EXAMPLE 8-1:
CALCULATING THE
MINIMUM REQUIRED
SAMPLE TIME
FIGURE 8-2:
ANALOG INPUT MODEL
V
HOLD = (VREF - (VREF/512)) (1 - e(-Tc/CHOLD(RIC + RSS + RS)))
or
Tc = -(51.2 pF)(1 k
+ RSS + RS) ln(1/511)
Note 1: The reference voltage (VREF) has no
effect on the equation, since it cancels
itself out.
2: The charge holding capacitor (CHOLD) is
not discharged after each conversion.
3: The maximum recommended impedance
for analog sources is 10 k
. This is
required to meet the pin leakage specifi-
cation.
4: After a conversion has completed, a
2.0 TAD delay must complete before
acquisition can begin again. During this
time, the holding capacitor is not con-
nected to the selected A/D input channel.
TACQ = Internal Amplifier Settling Time +
Holding Capacitor Charging Time +
Temperature Coefficient
TACQ =5
s + Tc + [(Temp - 25°C)(0.05 s/°C)]
TC
=-CHOLD (RIC + RSS + RS) ln(1/512)
-51.2 pF (1 k
+ 7 k + 10 k) ln(0.0020)
-51.2 pF (18 k
) ln(0.0020)
-0.921
s (-6.2146)
5.724
s
TACQ =5
s + 5.724 s + [(50°C - 25°C)(0.05 s/°C)]
10.724
s + 1.25 s
11.974
s
C
PIN
VA
R
S
RA
X
5 pF
V
DD
V
T = 0.6V
V
T = 0.6V
I leakage
R
IC
≤ 1k
Sampling
Switch
SS
R
SS
C
HOLD
= DAC capacitance
V
SS
6V
Sampling Switch
5V
4V
3V
2V
567 8 9 10 11
(k
)
V
DD
= 51.2 pF
± 500 nA
Legend: C
PIN
V
T
I leakage
R
IC
SS
C
HOLD
= input capacitance
= threshold voltage
= leakage current at the pin due to
= interconnect resistance
= sampling switch
= sample/hold capacitance (from DAC)
various junctions
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AT90LS2343-1SC 功能描述:IC MCU 2K FLASH 1MHZ COM 8-SOIC RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:AVR® 90LS 標(biāo)準(zhǔn)包裝:9 系列:87C 核心處理器:8051 芯體尺寸:8-位 速度:40/20MHz 連通性:UART/USART 外圍設(shè)備:POR，WDT 輸入/輸出數(shù):32 程序存儲(chǔ)器容量:32KB（32K x 8） 程序存儲(chǔ)器類型:OTP EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4.5 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)部 工作溫度:0°C ~ 70°C 封裝/外殼:40-DIP（0.600"，15.24mm） 包裝:管件
AT90LS2343-1SI 功能描述:8位微控制器 -MCU 2k bit 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
AT90LS2343-4PC 功能描述:8位微控制器 -MCU 2k bit 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
AT90LS2343-4PI 功能描述:8位微控制器 -MCU 2k bit 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
AT90LS2343-4SC 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:8-Bit Microcontroller with 2K Bytes of In-System Programmable Flash
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